Merge remote-tracking branch 'origin/main' into HEAD

Java formatting comes from jdtls' Eclipse formatter, whose defaults differ from the IntelliJ IDEA code style. Settings › Editor › Code Style › Java now offers a formatting profile: Default (unchanged), IntelliJ IDEA, or a custom Eclipse formatter XML (absolute or project-relative path).

The IntelliJ IDEA profile is a bundled Eclipse formatter XML that follows IDEA's default Java code style item by item (indents, aligned multi-line parameters, annotation placement, else/catch/finally on the same line, array initializers, lambdas, blank lines, comments not reflowed). Manual line breaks are kept; lines longer than 120 columns wrap where necessary, which differs from IDEA's default of not wrapping. The profile reaches a running jdtls through didChangeConfiguration without a restart; an unreadable custom file shows a warning and leaves code intelligence running. Code style changes reconfigure language servers without scheduling Kotlin bridge builds.

Also drops two catalog entries whose texts are no longer used.

Fixes #649

.git-blame-ignore-revs

@@ -0,0 +1,2 @@
+# Repository-wide oxfmt formatting (#135)
+55836e1b4961c9d87df8503ec374e624c81d6bf6

.github/workflows/ci.yml

@@ -3,11 +3,14 @@ on:
   push:
     branches: [main]
   pull_request:
+    branches: [main]
+    types: [opened, synchronize, reopened]
   workflow_dispatch:
 
 concurrency:
   group: ci-${{ github.ref }}
-  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+  # A newer push supersedes the run in progress, on main too.
+  cancel-in-progress: true
 
 env:
   CARGO_TERM_COLOR: always
@@ -29,7 +32,10 @@ jobs:
         with: { node-version: 22, cache: pnpm }
       - uses: dtolnay/rust-toolchain@stable
         with: { components: "clippy, rustfmt" }
+      # Only main saves the cache (saving takes minutes on Windows); PRs restore main's.
       - uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - uses: taiki-e/install-action@nextest
       - name: Linux deps
         if: runner.os == 'Linux'
@@ -45,9 +51,34 @@ jobs:
       # Test fixtures write LF files; keep Git from converting them on checkout.
       - run: git config --global core.autocrlf false
       - run: cargo nextest run --workspace --no-fail-fast
+      # nextest ran export_bindings, which rewrites src/bindings.ts.
       - name: Bindings are up to date
         if: runner.os == 'Linux'
-        run: pnpm gen:bindings && git diff --exit-code src/bindings.ts
+        run: git diff --exit-code src/bindings.ts
+
+  # The remote development server ships as a static Linux binary (release.yml):
+  # keep that build working.
+  server:
+    name: Remote server (linux musl)
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with: { targets: x86_64-unknown-linux-musl }
+      - uses: Swatinem/rust-cache@v2
+        with: { key: server-musl }
+      - run: sudo apt-get update && sudo apt-get install -y musl-tools
+      - run: cargo build --locked -p ide-host --bin openidea-server --target x86_64-unknown-linux-musl
+      - run: target/x86_64-unknown-linux-musl/debug/openidea-server --version
+
+  deny:
+    name: Cargo deny
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: taiki-e/install-action@cargo-deny
+      - run: cargo deny check
 
   frontend:
     name: Frontend
@@ -61,10 +92,26 @@ jobs:
       - run: pnpm install --frozen-lockfile
       - run: pnpm typecheck
       - run: pnpm lint
+      - run: pnpm format:check
+      - run: pnpm knip
       - run: pnpm test
       - run: pnpm build
-      - run: pnpm exec playwright install --with-deps chromium
+
+  e2e:
+    name: E2E
+    runs-on: ubuntu-24.04
+    # Browsers and their system libraries are preinstalled; keep the tag in step with @playwright/test.
+    container: mcr.microsoft.com/playwright:v1.64.1-noble
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with: { version: 11 }
+      - uses: actions/setup-node@v4
+        with: { node-version: 22, cache: pnpm }
+      - run: pnpm install --frozen-lockfile
       - run: pnpm e2e
+        env:
+          HOME: /root
       - uses: actions/upload-artifact@v4
         if: failure()
         with:

.github/workflows/release.yml

@@ -70,6 +70,12 @@ jobs:
           - name: Linux x64
             os: ubuntu-22.04
             target: x86_64-unknown-linux-gnu
+          - name: Linux arm64
+            os: ubuntu-22.04-arm
+            target: aarch64-unknown-linux-gnu
+          - name: Windows arm64
+            os: windows-11-arm
+            target: aarch64-pc-windows-msvc
           - name: Windows x64
             os: windows-latest
             target: x86_64-pc-windows-msvc
@@ -117,6 +123,8 @@ jobs:
           releaseId: ${{ needs.create-release.outputs.release_id }}
           tagName: ${{ env.TAG }}
           args: --target ${{ matrix.target }}
+          # The parallel builds would race on one latest.json; `updater-manifest` writes it once.
+          uploadUpdaterJson: false
       # tauri-action notarizes the .app but not the DMG around it; notarize and
       # staple the DMG too, then replace the uploaded asset.
       - name: Notarize DMG
@@ -131,9 +139,112 @@ jobs:
             gh release upload "$TAG" "$dmg" --clobber
           done
 
-  publish:
+  # The remote development server, per host platform it can run on. The desktop
+  # app downloads the one for the host (ide-tools `server`) and installs it over SSH.
+  # Linux builds are static (musl), so they run whatever the host's glibc.
+  server:
+    needs: create-release
+    name: Server (${{ matrix.os }}-${{ matrix.arch }})
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { runner: ubuntu-22.04, target: x86_64-unknown-linux-musl, os: linux, arch: x86_64 }
+          - { runner: ubuntu-24.04-arm, target: aarch64-unknown-linux-musl, os: linux, arch: aarch64 }
+          - { runner: macos-latest, target: aarch64-apple-darwin, os: macos, arch: aarch64 }
+          - { runner: macos-latest, target: x86_64-apple-darwin, os: macos, arch: x86_64 }
+    runs-on: ${{ matrix.runner }}
+    steps:
+      - uses: actions/checkout@v4
+        with: { ref: "${{ env.TAG }}" }
+      - uses: dtolnay/rust-toolchain@stable
+        with: { targets: "${{ matrix.target }}" }
+      - uses: Swatinem/rust-cache@v2
+        with: { key: "server-${{ matrix.target }}" }
+      - name: musl toolchain
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y musl-tools
+      - name: Build
+        run: |
+          # musl-tools only ships `musl-gcc`; cc-rs would look for `<arch>-linux-musl-gcc`.
+          if [ "$RUNNER_OS" = Linux ]; then export CC_${TARGET//-/_}=musl-gcc; fi
+          cargo build --release --locked -p ide-host --bin openidea-server --target "$TARGET"
+        env:
+          TARGET: ${{ matrix.target }}
+      - name: Upload
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ASSET: openidea-server-${{ matrix.os }}-${{ matrix.arch }}.gz
+        run: |
+          gzip -9 -c target/${{ matrix.target }}/release/openidea-server > "$ASSET"
+          if command -v sha256sum >/dev/null; then sha256sum "$ASSET"; else shasum -a 256 "$ASSET"; fi > "$ASSET.sha256"
+          gh release upload "$TAG" "$ASSET" "$ASSET.sha256" --clobber
+
+  # The updater manifest (latest.json), built once from the signed bundles every build uploaded.
+  # Fails when a platform is missing, so a release never ships a manifest without it.
+  updater-manifest:
     needs: [create-release, build]
     runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v7
+        env:
+          RELEASE_ID: ${{ needs.create-release.outputs.release_id }}
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const release_id = Number(process.env.RELEASE_ID);
+            const tag = process.env.TAG;
+            const assets = await github.paginate(github.rest.repos.listReleaseAssets, { owner, repo, release_id });
+            const sigs = assets.filter((a) => a.name.endsWith(".sig"));
+            if (sigs.length === 0) {
+              core.notice("no signed bundles (TAURI_SIGNING_PRIVATE_KEY unset): skipping latest.json");
+              return;
+            }
+            // Bundle suffix → updater platform keys, as tauri-action names them.
+            const kinds = [
+              [/_aarch64\.AppImage$/, ["linux-aarch64", "linux-aarch64-appimage"]],
+              [/_arm64\.deb$/, ["linux-aarch64-deb"]],
+              [/\.aarch64\.rpm$/, ["linux-aarch64-rpm"]],
+              [/_amd64\.AppImage$/, ["linux-x86_64", "linux-x86_64-appimage"]],
+              [/_amd64\.deb$/, ["linux-x86_64-deb"]],
+              [/\.x86_64\.rpm$/, ["linux-x86_64-rpm"]],
+              [/_aarch64\.app\.tar\.gz$/, ["darwin-aarch64", "darwin-aarch64-app"]],
+              [/_x64\.app\.tar\.gz$/, ["darwin-x86_64", "darwin-x86_64-app"]],
+              [/_arm64_en-US\.msi$/, ["windows-aarch64", "windows-aarch64-msi"]],
+              [/_arm64-setup\.exe$/, ["windows-aarch64-nsis"]],
+              [/_x64_en-US\.msi$/, ["windows-x86_64", "windows-x86_64-msi"]],
+              [/_x64-setup\.exe$/, ["windows-x86_64-nsis"]],
+            ];
+            const platforms = {};
+            for (const sig of sigs) {
+              const bundle = sig.name.slice(0, -".sig".length);
+              const kind = kinds.find(([re]) => re.test(bundle));
+              if (!kind) continue;
+              const { data } = await github.rest.repos.getReleaseAsset({
+                owner, repo, asset_id: sig.id, headers: { accept: "application/octet-stream" },
+              });
+              const signature = Buffer.from(data).toString("utf8").trim();
+              const url = `https://github.com/${owner}/${repo}/releases/download/${tag}/${encodeURIComponent(bundle)}`;
+              for (const key of kind[1]) platforms[key] = { signature, url };
+            }
+            const missing = kinds.flatMap(([, keys]) => keys).filter((k) => !platforms[k]);
+            if (missing.length) {
+              core.setFailed(`latest.json would miss ${missing.join(", ")}`);
+              return;
+            }
+            const manifest = { version: tag.replace(/^v/, ""), notes: "", pub_date: new Date().toISOString(), platforms };
+            const old = assets.find((a) => a.name === "latest.json");
+            if (old) await github.rest.repos.deleteReleaseAsset({ owner, repo, asset_id: old.id });
+            await github.rest.repos.uploadReleaseAsset({
+              owner, repo, release_id, name: "latest.json",
+              data: JSON.stringify(manifest, null, 2),
+              headers: { "content-type": "application/json" },
+            });
+            core.info(`latest.json: ${Object.keys(platforms).sort().join(", ")}`);
+
+  publish:
+    needs: [create-release, build, server, updater-manifest]
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/github-script@v7
         env:

.gitignore

@@ -33,3 +33,6 @@ playwright-report/
 # Local AI agent files
 CLAUDE.md
 .claude/
+
+# Local reference screenshots
+pycharm-screenshots/

.oxfmtrc.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "./node_modules/oxfmt/configuration_schema.json",
+  "printWidth": 120,
+  "semi": true,
+  "singleQuote": false,
+  "trailingComma": "all",
+  "sortPackageJson": false,
+  "ignorePatterns": [
+    "dist",
+    "target",
+    "src/bindings.ts",
+    "src/editor/core/cm/angular/parser*.ts",
+    "docs/plugins/themes.md",
+    "pnpm-lock.yaml",
+    "**/*.toml",
+    "fixtures",
+    "crates/**/tests/fixtures"
+  ],
+  "overrides": [
+    {
+      "files": ["**/*.md"],
+      "options": {
+        "embeddedLanguageFormatting": "off"
+      }
+    }
+  ]
+}

.oxlintrc.json

@@ -0,0 +1,151 @@
+{
+  "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "plugins": ["typescript", "react"],
+  "categories": {
+    "correctness": "off"
+  },
+  "env": {
+    "builtin": true
+  },
+  "ignorePatterns": [
+    "dist",
+    "target",
+    "src-tauri",
+    "crates",
+    "src/bindings.ts",
+    "src/editor/core/cm/angular/parser*.ts",
+    "fixtures",
+    "plugins",
+    "test-results",
+    "playwright-report",
+    ".claude"
+  ],
+  "rules": {
+    "constructor-super": "error",
+    "for-direction": "error",
+    "getter-return": "error",
+    "no-async-promise-executor": "error",
+    "no-case-declarations": "error",
+    "no-class-assign": "error",
+    "no-compare-neg-zero": "error",
+    "no-cond-assign": "error",
+    "no-const-assign": "error",
+    "no-constant-binary-expression": "error",
+    "no-constant-condition": "error",
+    "no-control-regex": "error",
+    "no-debugger": "error",
+    "no-delete-var": "error",
+    "no-dupe-class-members": "error",
+    "no-dupe-else-if": "error",
+    "no-dupe-keys": "error",
+    "no-duplicate-case": "error",
+    "no-empty": "error",
+    "no-empty-character-class": "error",
+    "no-empty-pattern": "error",
+    "no-empty-static-block": "error",
+    "no-ex-assign": "error",
+    "no-extra-boolean-cast": "error",
+    "no-fallthrough": "error",
+    "no-func-assign": "error",
+    "no-global-assign": "error",
+    "no-import-assign": "error",
+    "no-invalid-regexp": "error",
+    "no-irregular-whitespace": "error",
+    "no-loss-of-precision": "error",
+    "no-misleading-character-class": "error",
+    "no-new-native-nonconstructor": "error",
+    "no-nonoctal-decimal-escape": "error",
+    "no-obj-calls": "error",
+    "no-prototype-builtins": "error",
+    "no-redeclare": "error",
+    "no-regex-spaces": "error",
+    "no-self-assign": "error",
+    "no-setter-return": "error",
+    "no-shadow-restricted-names": "error",
+    "no-sparse-arrays": "error",
+    "no-this-before-super": "error",
+    "no-unassigned-vars": "error",
+    "no-unexpected-multiline": "error",
+    "no-unreachable": "error",
+    "no-unsafe-finally": "error",
+    "no-unsafe-negation": "error",
+    "no-unsafe-optional-chaining": "error",
+    "no-unused-labels": "error",
+    "no-unused-private-class-members": "error",
+    "no-unused-vars": [
+      "error",
+      {
+        "argsIgnorePattern": "^_",
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "no-useless-backreference": "error",
+    "no-useless-catch": "error",
+    "no-useless-escape": "error",
+    "no-with": "error",
+    "preserve-caught-error": "error",
+    "require-yield": "error",
+    "use-isnan": "error",
+    "valid-typeof": "error",
+    "no-array-constructor": "error",
+    "no-unused-expressions": "error",
+    "react/rules-of-hooks": "error",
+    "react/exhaustive-deps": "warn",
+    "react/static-components": "error",
+    "react/use-memo": "error",
+    "react/preserve-manual-memoization": "error",
+    "react/incompatible-library": "warn",
+    "react/immutability": "error",
+    "react/globals": "error",
+    "react/refs": "error",
+    "react/set-state-in-effect": "error",
+    "react/error-boundaries": "error",
+    "react/purity": "error",
+    "react/set-state-in-render": "error",
+    "react/unsupported-syntax": "warn",
+    "typescript/ban-ts-comment": "error",
+    "typescript/no-duplicate-enum-values": "error",
+    "typescript/no-empty-object-type": "error",
+    "typescript/no-explicit-any": "error",
+    "typescript/no-extra-non-null-assertion": "error",
+    "typescript/no-misused-new": "error",
+    "typescript/no-namespace": "error",
+    "typescript/no-non-null-asserted-optional-chain": "error",
+    "typescript/no-require-imports": "error",
+    "typescript/no-this-alias": "error",
+    "typescript/no-unnecessary-type-constraint": "error",
+    "typescript/no-unsafe-declaration-merging": "error",
+    "typescript/no-unsafe-function-type": "error",
+    "typescript/no-wrapper-object-types": "error",
+    "typescript/prefer-as-const": "error",
+    "typescript/prefer-namespace-keyword": "error",
+    "typescript/triple-slash-reference": "error"
+  },
+  "overrides": [
+    {
+      "files": ["**/*.ts", "**/*.tsx", "**/*.mts", "**/*.cts"],
+      "rules": {
+        "constructor-super": "off",
+        "getter-return": "off",
+        "no-class-assign": "off",
+        "no-const-assign": "off",
+        "no-dupe-class-members": "off",
+        "no-dupe-keys": "off",
+        "no-func-assign": "off",
+        "no-import-assign": "off",
+        "no-new-native-nonconstructor": "off",
+        "no-obj-calls": "off",
+        "no-redeclare": "off",
+        "no-setter-return": "off",
+        "no-this-before-super": "off",
+        "no-unreachable": "off",
+        "no-unsafe-negation": "off",
+        "no-var": "error",
+        "no-with": "off",
+        "prefer-const": "error",
+        "prefer-rest-params": "error",
+        "prefer-spread": "error"
+      }
+    }
+  ]
+}

.prettierignore

@@ -1,4 +0,0 @@
-dist
-target
-src/bindings.ts
-pnpm-lock.yaml

.prettierrc.json

@@ -1 +0,0 @@
-{ "printWidth": 120, "semi": true, "singleQuote": false, "trailingComma": "all" }

Cargo.toml

@@ -3,7 +3,7 @@ resolver = "3"
 members = ["crates/*", "src-tauri"]
 
 [workspace.package]
-version = "0.1.4"
+version = "0.1.33"
 edition = "2024"
 rust-version = "1.96"
 license = "Apache-2.0"
@@ -32,6 +32,15 @@ ide-coverage = { path = "crates/ide-coverage" }
 ide-profiler = { path = "crates/ide-profiler" }
 ide-http = { path = "crates/ide-http" }
 ide-db = { path = "crates/ide-db" }
+ide-web = { path = "crates/ide-web" }
+ide-spell = { path = "crates/ide-spell" }
+ide-agent = { path = "crates/ide-agent" }
+ide-clipboard = { path = "crates/ide-clipboard" }
+ide-fonts = { path = "crates/ide-fonts" }
+ide-ssh = { path = "crates/ide-ssh" }
+ide-remote = { path = "crates/ide-remote" }
+ide-host = { path = "crates/ide-host" }
+ide-notebook = { path = "crates/ide-notebook" }
 
 # serialization & IPC typing
 serde = { version = "1", features = ["derive"] }
@@ -39,6 +48,7 @@ serde_json = "1"
 toml = "0.9"
 toml_edit = "0.25"
 specta = { version = "=2.0.0-rc.25", features = ["derive"] }
+specta-typescript = "0.0.12"
 
 # async & concurrency
 tokio = { version = "1", features = ["rt-multi-thread", "macros", "sync", "time", "process", "io-util", "fs"] }
@@ -66,6 +76,7 @@ trash = "5"
 blake3 = "1"
 dunce = "1"
 dirs = "6"
+zip = { version = "9", default-features = false, features = ["deflate"] }
 
 # search, index, language
 grep-searcher = "0.1"
@@ -76,13 +87,18 @@ redb = "4"
 tree-sitter = "0.25"
 
 # protocols & integrations
+jupyter-zmq-client = { version = "=2.0.0", default-features = false, features = ["tokio-runtime", "ring"] }
+jupyter-protocol = "=2.0.3"
+zeromq = { version = "0.6", default-features = false, features = ["tokio-runtime", "tcp-transport"] }
 lsp-types = "0.97"
 gix = { version = "0.89", default-features = false }
 portable-pty = "0.9"
-reqwest = { version = "0.13", default-features = false, features = ["rustls-no-provider", "http2", "charset", "gzip", "deflate", "brotli"] }
+reqwest = { version = "0.13", default-features = false, features = ["rustls-no-provider", "http2", "charset", "socks", "gzip", "deflate", "brotli"] }
 rustls = { version = "0.23", default-features = false, features = ["ring", "std", "tls12", "logging"] }
 rustls-platform-verifier = "0.7"
 sqlx = { version = "0.9", default-features = false, features = ["runtime-tokio", "tls-rustls-ring-webpki", "sqlite", "postgres", "mysql"] }
+tiberius = { version = "0.13", default-features = false, features = ["tds73", "rustls", "sql-browser-tokio"] }
+bb8 = "0.9"
 uuid = { version = "1", features = ["v4"] }
 
 # testing
@@ -100,5 +116,7 @@ opt-level = 2
 codegen-units = 1
 lto = true
 opt-level = 3
-panic = "abort"
-strip = true
+# Unwind, so a panic fails one task or command instead of quitting the IDE.
+panic = "unwind"
+# Keep the symbol table: crash reports and logged backtraces name functions.
+strip = "debuginfo"

NOTICE

@@ -6,6 +6,10 @@ contributors as part of the IntelliJ Platform (https://github.com/JetBrains/inte
 https://github.com/JetBrains/intellij-plugins), licensed under the Apache License 2.0.
 Copyright 2000-2026 JetBrains s.r.o. and contributors.
 
+Some Simplified Chinese UI terms follow the Visual Studio Code Simplified Chinese
+language pack (https://github.com/microsoft/vscode-loc), Copyright (c) Microsoft
+Corporation, licensed under the MIT License.
+
 OpenIDEA is not affiliated with, endorsed by or sponsored by JetBrains s.r.o.
 IntelliJ and IntelliJ IDEA are trademarks of JetBrains s.r.o.
 

README.md

@@ -9,27 +9,35 @@
   The IDE you know, rebuilt in Rust.
 </p>
 
+<p align="center">
+  <a href="https://github.com/l0ng-ai/openidea/releases/latest"><b>Download</b></a>
+  &nbsp;·&nbsp;
+  <a href="#benchmark">Benchmark</a>
+  &nbsp;·&nbsp;
+  <a href="https://discord.gg/2Zy4yn7gP">Discord</a>
+</p>
+
 https://github.com/user-attachments/assets/234dd54c-1255-4b3a-b35c-533d78d737c0
 
 OpenIDEA brings the IntelliJ IDEA way of working — its keymap, its tool windows,
 its search-everything habits — to a native app with a Rust core.
 
 Editor, code insight, debugger, Git, terminal, database and HTTP clients,
-for 60+ languages.
+for 60+ languages. Builds for macOS, Windows and Linux.
 
 ## Benchmark
 
 Opening [freqtrade](https://github.com/freqtrade/freqtrade) (Python, ~770 files)
 with warm caches, median of 5 runs:
 
-| | OpenIDEA | IntelliJ IDEA 2026.2.3 |
-|---|---|---|
-| Window with the project | **0.9 s** | 3.1 s |
-| Ready (CPU settled) | **1.1 s** | 13.2 s |
-| Memory (USS, all processes) | **169 MB** | 2011 MB |
-| CPU time until ready | **2.4 s** | 47.9 s |
-| Idle CPU | **4 %** of a core | 7 % of a core |
-| Quit | **0.3 s** | 5.9 s |
+|                             | OpenIDEA          | IntelliJ IDEA 2026.2.3 |
+| --------------------------- | ----------------- | ---------------------- |
+| Window with the project     | **0.9 s**         | 3.1 s                  |
+| Ready (CPU settled)         | **1.1 s**         | 13.2 s                 |
+| Memory (USS, all processes) | **169 MB**        | 2011 MB                |
+| CPU time until ready        | **2.4 s**         | 47.9 s                 |
+| Idle CPU                    | **4 %** of a core | 7 % of a core          |
+| Quit                        | **0.3 s**         | 5.9 s                  |
 
 A release build of OpenIDEA from `main` and IDEA with default settings and plugins, on
 Windows 11, 32-core AMD, 62 GB RAM.
@@ -37,15 +45,6 @@ IDEA analyses Python more deeply, so "ready" doesn't mean the same work on
 both sides. Both are measured from the outside, the same way: see
 [`perf/compare`](perf/compare) to run it on your machine and projects.
 
-## Build
-
-```sh
-pnpm install
-pnpm tauri dev
-```
-
-Rust 1.96, Node 22, pnpm and the [Tauri prerequisites](https://v2.tauri.app/start/prerequisites/).
-
 ## License
 
 [Apache 2.0](LICENSE). Bundled third-party assets are listed in [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md).

THIRD_PARTY_LICENSES.md

@@ -1,5 +1,13 @@
 # Third-party licenses
 
+## Project Lombok
+
+`plugins/lombok/lombok-1.18.48-openidea.1.jar` contains Project Lombok v1.18.48 with the Equinox
+classloader fix from [projectlombok/lombok#4059](https://github.com/projectlombok/lombok/pull/4059).
+Copyright (C) 2009-2021 The Project Lombok Authors. MIT license and bundled component
+notices are retained in [plugins/lombok/LICENSE](plugins/lombok/LICENSE) and inside the jar.
+Source tag, patch commits and build instructions: [plugins/lombok/README.md](plugins/lombok/README.md).
+
 ## JetBrains IntelliJ Platform icons
 
 `src/ui/expui/**` contains SVG icons from the IntelliJ Platform "new UI" (expui)
@@ -12,12 +20,13 @@ icon set, copied unmodified (some renamed) from JetBrains' open-source repositor
   `python/python-requirements` (`fileTypes/requirements`); `python/pipenv`
   (`fileTypes/pipenv`); `python/python-pyproject` (`expui/toml.svg` →
   `fileTypes/pyprojectToml`); `plugins/kotlin/base` (`fileTypes/kotlin`,
-  `kotlinScript`, `kotlinGradleScript`); `java/openapi` (`fileTypes/maven`);
+  `kotlinScript`, `kotlinGradleScript`, `icons/expui/objectKotlin` → `kotlin/objectKotlin`); `java/openapi` (`fileTypes/maven`);
   `plugins/markdown` (`fileTypes/markdown`); `plugins/toml` (`fileTypes/toml`);
   `plugins/terminal` (`toolwindows/terminal`); `plugins/maven`
   (`images/expui/toolwindow/maven` → `toolwindows/maven`, `images/expui/build/maven*`
   → `maven/`); `plugins/gradle` (`icons/expui/gradle` → `toolwindows/gradle`,
-  `icons/expui/gradleLoadChanges` → `build/gradleLoadChanges`);
+  `icons/expui/gradleLoadChanges` → `build/gradleLoadChanges`,
+  `icons/expui/gradle`, `icons/gradleSubproject` → `gradle/`);
   `platform/external-system-impl` (`icons/newui/task` → `externalSystem/task`).
   Copyright 2000-2026 JetBrains s.r.o. and contributors. Apache License 2.0 (below).
 - [intellij-plugins](https://github.com/JetBrains/intellij-plugins) (each plugin
@@ -26,10 +35,37 @@ icon set, copied unmodified (some renamed) from JetBrains' open-source repositor
   `fileTypes/hashiCorp`, Apache-2.0); `makefile` (`expui/makefile` →
   `fileTypes/makefile`, MIT, Copyright (c) 2016 Victor Kropp — full text below).
 
+The read/write usage filter assets (`actions/showReadAccess{,_dark}.svg` and
+`actions/showWriteAccess{,_dark}.svg`) are copied unmodified from
+`platform/icons/src/expui/actions/` at intellij-community commit
+[`e992ff4750b4c36afe2caadfa8b191a8f36fb7a2`](https://github.com/JetBrains/intellij-community/tree/e992ff4750b4c36afe2caadfa8b191a8f36fb7a2/platform/icons/src/expui/actions).
+Their original copyright headers and Apache-2.0 licensing are retained.
+
+- [intellij-rust](https://github.com/intellij-rust/intellij-rust) (MIT):
+  `src/main/resources/icons/expui/rustFile{,_dark}.svg` →
+  `src/ui/expui/fileTypes/rust{,_dark}.svg`;
+  `src/main/resources/icons/expui/cargo{,_dark}.svg` and `cargoLock{,_dark}.svg` →
+  `src/ui/expui/fileTypes/cargo{,_dark}.svg` and `cargoLock{,_dark}.svg`.
+  Copyright (c) 2015 Aleksey Kladov, Evgeny Kurbatsky, Alexey Kudinkin and contributors;
+  Copyright (c) 2016 JetBrains. MIT licence, full text below.
+
 At render time `src/ui/icons.tsx` may recolour monochrome icons to `currentColor`.
 
+## JetBrains IntelliJ Platform diff algorithm
+
+`src/features/vcs/comparison/**` is a TypeScript port of the text comparison of
+[intellij-community](https://github.com/JetBrains/intellij-community) (Apache-2.0):
+`platform/util/diff` (`com.intellij.util.diff`: Diff, Reindexer, MyersLCS,
+PatienceIntLCS, UniqueLCS; `com.intellij.diff.comparison`: ByLineRt, ByWordRt,
+ByCharRt, ChunkOptimizer, ChangeCorrector, LineFragmentSplitter, TrimUtil,
+ComparisonUtil, iterables) and `platform/diff-impl` (ComparisonManagerImpl's
+`compareLinesInner` and `processBlocks`). `__tests__/ideaCases.json` is converted
+from its tests (`LineComparisonUtilTest`, `WordComparisonUtilTest`,
+`SplitComparisonUtilTest`). Modified from the originals. Copyright 2000-2026
+JetBrains s.r.o. and contributors. Apache License 2.0 (below).
+
 `src/ui/openidea/**` holds OpenIDEA's own file-type icons drawn in the expui style for
-languages whose JetBrains icons are not open source (Go, Rust, Ruby, Dart, Lua, Zig,
+languages whose JetBrains icons are not open source (Go, Ruby, Dart, Lua, Zig,
 Svelte, …). Those using the page-with-corner-badge layout (`goMod`, `goWork`,
 `dotenv`, `readme`, `lock`, `license`) reuse the page outline of the Apache-2.0
 expui `fileTypes/h.svg`; that outline is modified from the original by JetBrains.
@@ -40,6 +76,31 @@ The lettering in `src-tauri/icons/source/openidea-wordmark*.svg` is outlined fro
 Inter Tight (Copyright 2022 The Inter Project Authors, SIL Open Font License 1.1,
 https://github.com/rsms/inter-tight).
 
+### MIT License (Rust and Cargo icons)
+
+The MIT License (MIT)
+
+Copyright (c) 2015 Aleksey Kladov, Evgeny Kurbatsky, Alexey Kudinkin and contributors
+Copyright (c) 2016 JetBrains
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
 ### MIT License (makefile icon)
 
 Copyright (c) 2016 Victor Kropp
@@ -79,6 +140,37 @@ user's app-data directory only when the user asks; none of them ships with OpenI
   unmodified, and its source is available from the repository above.
 - **Eclipse JDT Language Server** (jdtls): EPL-2.0, from download.eclipse.org.
 
+## en_US / en_GB Hunspell dictionaries
+
+`crates/ide-spell/src/dict/en_US.{aff,dic}` (the spell checker's bundled dictionary) is the
+SCOWL-derived en_US Hunspell dictionary (version 2020.12.07, from the `dictionary-en` npm
+package 4.0.0), copied unmodified. Copyright Kevin Atkinson and the SCOWL / Hunspell
+dictionary contributors; MIT- and BSD-style licences, full text in
+`crates/ide-spell/src/dict/LICENSE-en_US`. `crates/ide-spell/src/dict/en_GB-extra.dic` holds the
+entries of the matching en_GB dictionary (`dictionary-en-gb` npm package 3.0.0, same SCOWL
+version, licence and affix file) that en_US lacks. They are checked with the
+[spellbook](https://github.com/helix-editor/spellbook) crate (MPL-2.0).
+
+## cspell-dicts word lists
+
+`crates/ide-spell/src/dict/cspell-terms.txt` (programming terms the spell checker accepts)
+is derived from the software-terms, typescript, node, rust, fullstack, golang, java, cpp,
+shell and css dictionaries of [cspell-dicts](https://github.com/streetsidesoftware/cspell-dicts)
+(October 2026): lowercased, filtered and merged by OpenIDEA. Copyright Street Side Software;
+MIT licence, full text in `crates/ide-spell/src/dict/LICENSE-cspell-dicts`.
+
+## CodeMirror Angular template language
+
+`src/editor/core/cm/angular/` (`angular.grammar`, `tokens.ts`, `index.ts` and the
+`parser.ts` generated from them) is derived from
+[@codemirror/lang-angular](https://github.com/codemirror/lang-angular) 0.1.4
+(commit `ecc5038f`). Copyright (C) 2018-2021 by Marijn Haverbeke and others; MIT
+licence, full text in `src/editor/core/cm/angular/LICENSE`. Modifications by
+OpenIDEA: control-flow blocks (`@if`, `@for`, `@switch`, `@defer`, ...) and `@let`
+declarations, key and animation binding names (`(keydown.enter)`, `[@fade]`,
+`(@fade.done)`), runs of text that entities split (`a && b`) parsed as one, and one
+token for `{` and `}`.
+
 ## nvim-treesitter queries
 
 `crates/ide-syntax/queries/<grammar>/locals.scm` are derived from the `locals.scm`
@@ -97,7 +189,7 @@ Apache License
 
 Version 2.0, January 2004
 
-http://www.apache.org/licenses/ 
+http://www.apache.org/licenses/
 
 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
@@ -148,3 +240,124 @@ If the Work includes a "NOTICE" text file as part of its distribution, then any
 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.
 
 END OF TERMS AND CONDITIONS
+
+## Solarized
+
+The Solarized palettes in `src/styles/tokens.css` are adapted from
+[Ethan Schoonover’s Solarized](https://github.com/altercation/solarized/tree/62f656a02f93c5190a8753159e34b385588d5ff3).
+See [theme sources and mapping](docs/themes.md). MIT license:
+
+```text
+Copyright (c) 2011 Ethan Schoonover
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+```
+
+## Atom One Light and One Dark
+
+The One palettes and semantic syntax mapping in `src/styles/tokens.css` are
+adapted from GitHub’s Atom One syntax and UI themes.
+Source revisions are listed in [theme sources and mapping](docs/themes.md).
+Both syntax themes use the following MIT notice:
+
+```text
+Copyright (c) 2016 GitHub Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+```
+
+Both UI themes use the following MIT notice:
+
+```text
+Copyright (c) 2014 GitHub Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+```
+
+## Chinese UI terminology from Visual Studio Code
+
+Some Simplified Chinese terms in `src/platform/locales/text/zh.json` follow the
+wording of the Visual Studio Code Simplified Chinese language pack
+([microsoft/vscode-loc](https://github.com/microsoft/vscode-loc), MIT), e.g.
+"未跟踪" (untracked), "合并冲突" (merge conflicts), "当前" (current), "已修改"
+(modified), "已过时" (outdated), "中止" (abort), "正在卸载" (uninstalling),
+"深色" / "浅色" (dark / light) and "只读" (read-only). The remaining translations
+are written for this project.
+
+```
+Visual Studio Code Localization Packs
+
+Copyright (c) Microsoft Corporation
+
+All rights reserved.
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE
+```

crates/ide-agent/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "ide-agent"
+description = "Coding agents over the Agent Client Protocol: tasks, sessions, worktrees and their timelines"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+encoding_rs.workspace = true
+ide-vfs.workspace = true
+ide-core.workspace = true
+ide-jsonrpc.workspace = true
+ide-vcs.workspace = true
+ide-tools = { path = "../ide-tools" }
+serde.workspace = true
+serde_json.workspace = true
+specta.workspace = true
+tokio.workspace = true
+toml.workspace = true
+tracing.workspace = true
+parking_lot.workspace = true
+dunce.workspace = true
+uuid.workspace = true
+which = "8"
+
+[dev-dependencies]
+tempfile.workspace = true

crates/ide-agent/src/acp/e2e.rs

@@ -0,0 +1,215 @@
+//! A task against an ACP v2 agent that plays back a turn captured from `claude-agent-acp`.
+
+use super::tests::{TURN, frames};
+use crate::*;
+use ide_jsonrpc::{Framing, Handler, Peer, codes};
+use parking_lot::Mutex;
+use serde_json::{Value, json};
+use std::path::Path;
+use std::sync::{Arc, OnceLock};
+use std::time::Duration;
+
+const SESSION: &str = "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a";
+
+#[derive(Default)]
+struct FakeV2Agent {
+    peer: OnceLock<Peer>,
+    calls: Mutex<Vec<(String, Value)>>,
+}
+
+impl FakeV2Agent {
+    fn methods(&self) -> Vec<String> {
+        self.calls.lock().iter().map(|(m, _)| m.clone()).collect()
+    }
+
+    fn result(id: i64) -> Value {
+        frames(TURN, "in").into_iter().find(|m| m["id"] == id && m.get("result").is_some()).unwrap()["result"].clone()
+    }
+
+    fn update(&self, update: Value) {
+        let peer = self.peer.get().unwrap();
+        peer.notify("session/update", json!({ "sessionId": SESSION, "update": update })).unwrap();
+    }
+}
+
+impl Handler for FakeV2Agent {
+    fn on_notification(&self, method: &str, params: Value) {
+        self.calls.lock().push((method.to_owned(), params));
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        self.calls.lock().push((method.to_owned(), params.clone()));
+        let peer = self.peer.get().unwrap().clone();
+        match method {
+            "initialize" => Ok(Self::result(1)),
+            "session/new" => Ok(Self::result(2)),
+            "session/set_config_option" => Ok(Self::result(3)),
+            "session/resume" => {
+                // The state snapshot v2 sends before answering.
+                self.update(json!({ "sessionUpdate": "state_update", "state": "idle" }));
+                Ok(json!({ "configOptions": Self::result(2)["configOptions"] }))
+            }
+            "session/prompt" if params.pointer("/prompt/0/text") == Some(&json!("again")) => {
+                self.update(json!({ "sessionUpdate": "user_message", "messageId": "u2", "content": params["prompt"] }));
+                std::thread::spawn(move || {
+                    let update = |u: Value| peer.notify("session/update", json!({ "sessionId": SESSION, "update": u }));
+                    update(json!({ "sessionUpdate": "state_update", "state": "running" })).unwrap();
+                    update(json!({ "sessionUpdate": "agent_message_chunk", "messageId": "m2",
+                        "content": { "type": "text", "text": "second turn" } }))
+                    .unwrap();
+                    update(json!({ "sessionUpdate": "state_update", "state": "idle", "stopReason": "end_turn" }))
+                        .unwrap();
+                });
+                Ok(json!({ "messageId": "u2" }))
+            }
+            "session/prompt" => {
+                // The captured turn: its echo, the answer, then the rest on its own.
+                let script = frames(TURN, "in");
+                let answer = script.iter().position(|m| m["id"] == 4).unwrap();
+                peer.notify("session/update", &script[answer - 1]["params"]).unwrap();
+                let rest = script[answer + 1..].to_vec();
+                std::thread::spawn(move || {
+                    for m in rest {
+                        match m["method"].as_str() {
+                            Some("session/update") => peer.notify("session/update", &m["params"]).unwrap(),
+                            Some(method) => {
+                                let _: Value = tokio_block(peer.request(method, &m["params"], None)).unwrap();
+                            }
+                            None => {}
+                        }
+                    }
+                });
+                Ok(Self::result(4))
+            }
+            _ => Err((codes::METHOD_NOT_FOUND, method.to_owned())),
+        }
+    }
+}
+
+fn tokio_block<F: std::future::Future>(f: F) -> F::Output {
+    tokio::runtime::Builder::new_current_thread().enable_all().build().unwrap().block_on(f)
+}
+
+fn manager(dir: &Path, agent: Arc<FakeV2Agent>) -> AgentManager {
+    let connector: Connector = Arc::new(move |_spec, _cwd, client, _stderr| {
+        let (a, b) = tokio::io::duplex(1 << 20);
+        let (ar, aw) = tokio::io::split(a);
+        let (br, bw) = tokio::io::split(b);
+        let server = Peer::connect_framed(br, bw, agent.clone(), Framing::Lines);
+        let _ = agent.peer.set(server);
+        Ok(Peer::connect_framed(ar, aw, client, Framing::Lines))
+    });
+    AgentManager::with_connector(
+        AgentPaths {
+            project_root: dir.to_path_buf(),
+            store_dir: dir.join("store"),
+            worktrees_dir: dir.join("worktrees"),
+            models_file: dir.join("models.json"),
+            custom_agents_dir: None,
+            home_dir: None,
+        },
+        tokio::runtime::Handle::current(),
+        connector,
+    )
+}
+
+async fn wait_for(mgr: &AgentManager, id: &str, status: AgentStatus) {
+    for _ in 0..500 {
+        if mgr.task(id).unwrap().state.lock().task.status == status {
+            return;
+        }
+        tokio::time::sleep(Duration::from_millis(10)).await;
+    }
+    panic!("task never reached {status:?}");
+}
+
+fn text(t: &str) -> AgentPrompt {
+    AgentPrompt { text: t.into(), ..AgentPrompt::default() }
+}
+
+fn summary(entries: &[AgentEntry]) -> Vec<String> {
+    entries
+        .iter()
+        .map(|e| match e {
+            AgentEntry::User { text, .. } => format!("user: {}", text.lines().next().unwrap_or_default()),
+            AgentEntry::Agent { text } => format!("agent: {text}"),
+            AgentEntry::Tool { title, status, diffs, .. } => format!("{title} {status:?} {}", diffs.len()),
+            AgentEntry::Permission { title, chosen, .. } => format!("{title}? {}", chosen.clone().unwrap_or_default()),
+            other => format!("{other:?}"),
+        })
+        .collect()
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_task_runs_on_a_v2_agent_and_resumes_its_session() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeV2Agent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("Use the TodoWrite tool"),
+            provider: "claude-acp".into(),
+            config: vec![AgentConfigChoice { id: "model".into(), value: "haiku".into() }],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+    // The turn is not over while the agent waits for an answer.
+    assert!(mgr.task(&task.id).unwrap().state.lock().busy);
+    let permission = mgr
+        .entries(&task.id, None)
+        .unwrap()
+        .iter()
+        .find_map(|e| match e {
+            AgentEntry::Permission { id, .. } => Some(*id),
+            _ => None,
+        })
+        .unwrap();
+    mgr.respond(&task.id, permission, Some("allow-once".into())).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+
+    let entries = mgr.entries(&task.id, None).unwrap();
+    assert_eq!(
+        summary(&entries),
+        [
+            "user: Use the TodoWrite tool",
+            "ToolSearch Completed 0",
+            "echo hello; ls -la /work/proj/note.txt 2>&1 Failed 0",
+            "Write /work/proj/note.txt Completed 1",
+            "Write /work/proj/note.txt? Yes",
+            "agent: done",
+        ]
+    );
+    {
+        let t = mgr.task(&task.id).unwrap().state.lock().task.clone();
+        assert_eq!(t.model.as_deref(), Some("haiku"));
+        assert_eq!(t.title, "Todo list and file creation test");
+        assert!(t.usage.is_some());
+        assert_eq!(t.commands.len(), 2, "{:?}", t.commands);
+        let mode = t.config.iter().find(|o| o.id == "mode").unwrap();
+        assert_eq!(mode.via, AgentConfigVia::Option, "v2 has no modes: the mode is a config option");
+    }
+    let set = agent.calls.lock().iter().find(|(m, _)| m == "session/set_config_option").unwrap().1.clone();
+    assert_eq!((set["configId"].clone(), set["type"].clone()), (json!("model"), json!("id")));
+
+    // Restarted: the session resumes without a replay, and a stale `idle` doesn't end the next turn.
+    mgr.shutdown();
+    let agent2 = Arc::new(FakeV2Agent::default());
+    let mgr2 = manager(tmp.path(), agent2.clone());
+    mgr2.prompt(&task.id, text("again"), false).await.unwrap();
+    tokio::time::sleep(Duration::from_millis(50)).await;
+    wait_for(&mgr2, &task.id, AgentStatus::Ready).await;
+    let entries = mgr2.entries(&task.id, None).unwrap();
+    assert_eq!(summary(&entries[6..]), ["user: again", "agent: second turn"]);
+    let methods = agent2.methods();
+    assert!(
+        methods.contains(&"session/resume".to_owned()) && !methods.contains(&"session/load".to_owned()),
+        "{methods:?}"
+    );
+    let resume = agent2.calls.lock().iter().find(|(m, _)| m == "session/resume").unwrap().1.clone();
+    assert_eq!(resume["sessionId"], SESSION);
+    assert!(resume.get("replayFrom").is_none());
+}

crates/ide-agent/src/acp/mod.rs

@@ -0,0 +1,425 @@
+//! The ACP dialect an agent speaks: v1, or the v2 draft (`claude-agent-acp` serves v2
+//! to clients that ask for it). The rest of the crate speaks v1; this layer negotiates
+//! the version in `initialize` and translates v2 in both directions:
+//!
+//! - `initialize`: one request that both versions accept ([`initialize_params`]); the
+//!   response's shape tells which one the agent chose ([`Negotiated`]).
+//! - Requests ([`Conn::request`]): `session/load` becomes `session/resume` without a
+//!   replay (the task keeps its own history), `authenticate` becomes `auth/login`, a
+//!   select config value gets its `type: "id"` tag, and the commands that v2 puts in
+//!   setup responses arrive as the v1 `available_commands_update`.
+//! - Turns: a v2 `session/prompt` answers once the prompt is taken in, and the turn ends
+//!   with an `idle` `state_update`; [`Conn::request`] resolves `session/prompt` there,
+//!   with the v1 response (`stopReason`) or the turn's error.
+//! - Agent → client ([`Dialect`]): `session/update`s are normalized ([`normalize`]) and
+//!   permission requests get the v1 `toolCall`.
+
+mod normalize;
+
+use ide_jsonrpc::{Handler, Peer, RpcError, codes};
+use normalize::Normalizer;
+use parking_lot::Mutex;
+use serde::Serialize;
+use serde::de::DeserializeOwned;
+use serde_json::{Value, json};
+use std::collections::HashMap;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicU8, Ordering};
+use tokio::sync::oneshot;
+
+/// The capabilities this client offers, in v1 form.
+fn client_capabilities() -> Value {
+    json!({
+        "fs": { "readTextFile": false, "writeTextFile": false },
+        "terminal": false,
+        // Subagents as sessions of their own (ACP subagents RFD; v2 baseline).
+        "subagents": {},
+    })
+}
+
+/// The `initialize` request for either version: v2's `protocolVersion`, `info` and
+/// `capabilities`, plus v1's `clientCapabilities` and `clientInfo`. A v1 agent answers
+/// with version 1 and reads the v1 fields; a v2 agent ignores them.
+/// `client_info` is `{ name, version }`.
+pub(crate) fn initialize_params(client_info: &Value) -> Value {
+    json!({
+        "protocolVersion": 2,
+        "info": client_info,
+        "capabilities": {},
+        "clientCapabilities": client_capabilities(),
+        "clientInfo": client_info,
+    })
+}
+
+/// What `initialize` settled: the protocol generation and the agent's capabilities in
+/// v1 form (`agentCapabilities`), whichever version it speaks.
+#[derive(Clone, Debug, PartialEq)]
+pub(crate) struct Negotiated {
+    /// 1 or 2.
+    pub generation: u8,
+    /// v1 `agentCapabilities`: `loadSession`, `promptCapabilities`, `mcpCapabilities`,
+    /// `sessionCapabilities`, `_meta`.
+    pub capabilities: Value,
+    /// v1 `agentInfo`.
+    pub agent_info: Option<Value>,
+    /// v1 `authMethods` (`{ id, name, description?, type? }`).
+    pub auth_methods: Vec<Value>,
+    /// The response's top-level `_meta`.
+    pub meta: Option<Value>,
+}
+
+impl Negotiated {
+    /// Reads an `initialize` response. The shape decides, not `protocolVersion`: some v1
+    /// agents report version 2 with v1 fields (`agentInfo`, `agentCapabilities`); only a
+    /// v2 response has `info`.
+    pub fn from_initialize(response: &Value) -> Self {
+        let meta = response.get("_meta").filter(|m| m.is_object()).cloned();
+        if response.get("info").is_none_or(Value::is_null) {
+            return Self {
+                generation: 1,
+                capabilities: response.get("agentCapabilities").cloned().unwrap_or_else(|| json!({})),
+                agent_info: response.get("agentInfo").filter(|v| !v.is_null()).cloned(),
+                auth_methods: response.get("authMethods").and_then(Value::as_array).cloned().unwrap_or_default(),
+                meta,
+            };
+        }
+        let caps = response.get("capabilities");
+        let session = caps.and_then(|c| c.get("session")).filter(|s| s.is_object());
+        // v2 capabilities are objects: present (`{}`) means supported, absent or `null` not.
+        let has = |v: Option<&Value>, key: &str| v.and_then(|v| v.get(key)).is_some_and(|c| !c.is_null());
+        let prompt = session.and_then(|s| s.get("prompt"));
+        let mcp = session.and_then(|s| s.get("mcp"));
+        let mut capabilities = json!({
+            // The session baseline includes `session/resume`, which stands in for `session/load`.
+            "loadSession": session.is_some(),
+            "promptCapabilities": {
+                "image": has(prompt, "image"),
+                "audio": has(prompt, "audio"),
+                "embeddedContext": has(prompt, "embeddedContext"),
+            },
+            "mcpCapabilities": { "http": has(mcp, "http"), "sse": false },
+        });
+        if session.is_some() {
+            let mut sc = json!({ "list": {}, "resume": {}, "close": {} });
+            for key in ["fork", "delete", "additionalDirectories"] {
+                if has(session, key) {
+                    sc[key] = json!({});
+                }
+            }
+            capabilities["sessionCapabilities"] = sc;
+        }
+        if let Some(m) = caps.and_then(|c| c.get("_meta")).filter(|m| m.is_object()) {
+            capabilities["_meta"] = m.clone();
+        }
+        let auth_methods = response
+            .get("authMethods")
+            .and_then(Value::as_array)
+            .into_iter()
+            .flatten()
+            .filter_map(|m| {
+                let mut v1 = m.as_object()?.clone();
+                let id = v1.remove("methodId")?;
+                v1.insert("id".into(), id);
+                Some(Value::Object(v1))
+            })
+            .collect();
+        Self { generation: 2, capabilities, agent_info: response.get("info").cloned(), auth_methods, meta }
+    }
+
+    /// Whether a saved session can be reopened (`session/load` on v1, `session/resume` on v2).
+    pub fn load_session(&self) -> bool {
+        self.capabilities.get("loadSession").and_then(Value::as_bool) == Some(true)
+    }
+
+    /// `promptCapabilities.<name>` (`image`, `audio`, `embeddedContext`).
+    pub fn prompt(&self, name: &str) -> bool {
+        self.capabilities.pointer(&format!("/promptCapabilities/{name}")).and_then(Value::as_bool) == Some(true)
+    }
+
+    /// `sessionCapabilities.<name>` (`fork`, `resume`, `close`, `list`, `delete`).
+    pub fn session(&self, name: &str) -> bool {
+        self.capabilities.pointer(&format!("/sessionCapabilities/{name}")).is_some_and(|v| !v.is_null())
+    }
+
+    /// `agentCapabilities._meta` at `pointer` (e.g. `/openidea/rollback`).
+    pub fn meta(&self, pointer: &str) -> Option<&Value> {
+        self.capabilities.get("_meta")?.pointer(pointer)
+    }
+}
+
+/// The client side of one agent connection: wraps the task's [`Handler`] and, once
+/// `initialize` has chosen v2, translates what the agent sends.
+pub(crate) struct Dialect {
+    inner: Arc<dyn Handler>,
+    /// 0 until `initialize` answers; then 1 or 2.
+    generation: AtomicU8,
+    normalizer: Mutex<Normalizer>,
+    /// Running v2 prompts, by session id.
+    turns: Mutex<HashMap<String, Turn>>,
+}
+
+struct Turn {
+    done: oneshot::Sender<Result<Value, RpcError>>,
+    /// The agent took the prompt in (`user_message`) or reported the turn working.
+    /// Before that an `idle` without a stop reason is a stale state snapshot.
+    started: bool,
+}
+
+impl Dialect {
+    pub fn wrap(inner: Arc<dyn Handler>) -> Arc<Self> {
+        Arc::new(Self {
+            inner,
+            generation: AtomicU8::new(0),
+            normalizer: Mutex::new(Normalizer::default()),
+            turns: Mutex::new(HashMap::new()),
+        })
+    }
+
+    pub fn generation(&self) -> u8 {
+        self.generation.load(Ordering::Acquire)
+    }
+
+    fn v2(&self) -> bool {
+        self.generation() == 2
+    }
+
+    /// Feeds a v1 update to the wrapped handler as if the agent had sent it.
+    fn deliver(&self, session: &str, update: Value) {
+        self.inner.on_notification("session/update", json!({ "sessionId": session, "update": update }));
+    }
+
+    /// Settles the running prompt of `session` on a v2 `state_update`.
+    fn on_state(&self, session: &str, update: &Value) {
+        let mut turns = self.turns.lock();
+        let Some(turn) = turns.get_mut(session) else { return };
+        let stop = update.get("stopReason").and_then(Value::as_str);
+        match update.get("state").and_then(Value::as_str) {
+            Some("idle") if turn.started || stop.is_some() => {}
+            Some("idle") => return,
+            Some(_) => {
+                turn.started = true;
+                return;
+            }
+            None => return,
+        }
+        let Some(turn) = turns.remove(session) else { return };
+        let error = update.get("error").filter(|e| e.is_object());
+        let result = match error {
+            e if e.is_some() || stop == Some("error") => Err(RpcError::Server {
+                code: e.and_then(|e| e.get("code")).and_then(Value::as_i64).unwrap_or(codes::INTERNAL_ERROR),
+                message: e
+                    .and_then(|e| e.get("message"))
+                    .and_then(Value::as_str)
+                    .unwrap_or("The agent stopped with an error.")
+                    .to_owned(),
+                data: e.and_then(|e| e.get("data")).cloned(),
+            }),
+            _ => {
+                let mut v = json!({ "stopReason": stop.unwrap_or("end_turn") });
+                if let Some(u) = update.get("usage").filter(|u| !u.is_null()) {
+                    v["usage"] = u.clone();
+                }
+                Ok(v)
+            }
+        };
+        let _ = turn.done.send(result);
+    }
+
+    /// A v2 setup response (`session/new`, `resume`, `fork`): its commands become the
+    /// `available_commands_update` a v1 agent sends after it.
+    fn on_setup(&self, session: Option<&str>, response: &Value) {
+        let (Some(session), Some(commands)) = (session, response.get("availableCommands").filter(|c| c.is_array()))
+        else {
+            return;
+        };
+        let update = json!({ "sessionUpdate": "available_commands_update", "availableCommands": commands });
+        let updates = self.normalizer.lock().normalize(session, &update);
+        for u in updates {
+            self.deliver(session, u);
+        }
+    }
+}
+
+impl Handler for Dialect {
+    fn on_notification(&self, method: &str, params: Value) {
+        if !self.v2() || method != "session/update" {
+            return self.inner.on_notification(method, params);
+        }
+        let (Some(session), Some(update)) = (params.get("sessionId").and_then(Value::as_str), params.get("update"))
+        else {
+            return;
+        };
+        match update.get("sessionUpdate").and_then(Value::as_str) {
+            Some("state_update") => return self.on_state(session, update),
+            Some("user_message") => {
+                if let Some(turn) = self.turns.lock().get_mut(session) {
+                    turn.started = true;
+                }
+            }
+            _ => {}
+        }
+        let updates = self.normalizer.lock().normalize(session, update);
+        for u in updates {
+            let mut p = params.clone();
+            p["update"] = u;
+            self.inner.on_notification(method, p);
+        }
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        if self.v2() && method == "session/request_permission" {
+            return self.inner.on_request(method, v1_permission_request(params));
+        }
+        self.inner.on_request(method, params)
+    }
+}
+
+/// A v2 permission request with the v1 `toolCall` (its subject's, titled with the request's title).
+fn v1_permission_request(mut params: Value) -> Value {
+    let subject = params.get("subject").cloned().unwrap_or(Value::Null);
+    let mut tool = match subject.get("type").and_then(Value::as_str) {
+        Some("tool_call") => subject.get("toolCall").cloned().unwrap_or_else(|| json!({})),
+        _ => json!({ "toolCallId": subject.get("toolCallId").cloned().unwrap_or(Value::Null), "kind": "execute" }),
+    };
+    if let Some(content) = tool.get("content").and_then(Value::as_array) {
+        tool["content"] = Value::Array(normalize::v1_content(content, &|_| None));
+    }
+    if let Some(title) = params.get("title").filter(|t| t.as_str().is_some_and(|t| !t.is_empty())) {
+        tool["title"] = title.clone();
+    }
+    params["toolCall"] = tool;
+    params
+}
+
+/// A connection to an agent, spoken in v1 whichever version the agent chose.
+#[derive(Clone)]
+pub(crate) struct Conn {
+    peer: Peer,
+    dialect: Arc<Dialect>,
+}
+
+impl std::ops::Deref for Conn {
+    type Target = Peer;
+    fn deref(&self) -> &Peer {
+        &self.peer
+    }
+}
+
+impl Conn {
+    /// `peer` must deliver the agent's messages to `dialect`.
+    pub fn new(peer: Peer, dialect: Arc<Dialect>) -> Self {
+        Self { peer, dialect }
+    }
+
+    #[allow(dead_code)]
+    pub fn generation(&self) -> u8 {
+        self.dialect.generation()
+    }
+
+    /// Sends the negotiating `initialize` and settles the dialect.
+    pub async fn initialize(&self, client_info: &Value) -> Result<Negotiated, RpcError> {
+        let response: Value = self.peer.request("initialize", initialize_params(client_info), None).await?;
+        let negotiated = Negotiated::from_initialize(&response);
+        self.dialect.generation.store(negotiated.generation, Ordering::Release);
+        Ok(negotiated)
+    }
+
+    /// A v1 request, sent in the agent's dialect; the response comes back in v1 form.
+    pub async fn request<P: Serialize, R: DeserializeOwned>(
+        &self,
+        method: &str,
+        params: P,
+        cancel: Option<ide_core::CancellationToken>,
+    ) -> Result<R, RpcError> {
+        let params = serde_json::to_value(params).map_err(|e| RpcError::Protocol(e.to_string()))?;
+        let value = if self.dialect.v2() {
+            self.request_v2(method, params, cancel).await?
+        } else {
+            self.peer.request(method, params, cancel).await?
+        };
+        serde_json::from_value(value).map_err(|e| RpcError::Protocol(format!("{method}: {e}")))
+    }
+
+    async fn request_v2(
+        &self,
+        method: &str,
+        mut params: Value,
+        cancel: Option<ide_core::CancellationToken>,
+    ) -> Result<Value, RpcError> {
+        let session = params.get("sessionId").and_then(Value::as_str).map(str::to_owned);
+        match method {
+            "session/prompt" => return self.prompt_v2(params, cancel).await,
+            // The task keeps its history: resumed without a replay.
+            "session/load" | "session/resume" | "session/fork" => {
+                let method = if method == "session/load" { "session/resume" } else { method };
+                let response: Value = self.peer.request(method, params, cancel).await?;
+                let id = response.get("sessionId").and_then(Value::as_str).map(str::to_owned).or(session);
+                self.dialect.on_setup(id.as_deref(), &response);
+                return Ok(response);
+            }
+            "session/new" => {
+                let response: Value = self.peer.request(method, params, cancel).await?;
+                self.dialect.on_setup(response.get("sessionId").and_then(Value::as_str), &response);
+                return Ok(response);
+            }
+            // v2 tags the value's type.
+            "session/set_config_option" if params.get("type").is_none() => {
+                params["type"] =
+                    json!(if params.get("value").is_some_and(Value::is_boolean) { "boolean" } else { "id" });
+            }
+            _ => {}
+        }
+        let method = match method {
+            "authenticate" => "auth/login",
+            "logout" => "auth/logout",
+            m => m,
+        };
+        self.peer.request(method, params, cancel).await
+    }
+
+    /// A v2 prompt: answered once taken in; the turn ends with the session's `idle`.
+    async fn prompt_v2(&self, params: Value, cancel: Option<ide_core::CancellationToken>) -> Result<Value, RpcError> {
+        let session = params.get("sessionId").and_then(Value::as_str).unwrap_or_default().to_owned();
+        let (done, ended) = oneshot::channel();
+        // Before sending: the turn can end before the response is read.
+        self.dialect.turns.lock().insert(session.clone(), Turn { done, started: false });
+        let turns = &self.dialect.turns;
+        let _forget = Forget(|| {
+            turns.lock().remove(&session);
+        });
+        match self.peer.request::<_, Value>("session/prompt", params, cancel.clone()).await {
+            Ok(_) => {}
+            // Cancelled while queued, before the agent took it in (`-32800`).
+            Err(RpcError::Cancelled) if !cancel.as_ref().is_some_and(|t| t.is_cancelled()) => {
+                return Ok(json!({ "stopReason": "cancelled" }));
+            }
+            Err(e) => return Err(e),
+        }
+        let cancelled = async {
+            match &cancel {
+                Some(t) => t.cancelled().await,
+                None => std::future::pending().await,
+            }
+        };
+        tokio::select! {
+            biased;
+            r = ended => r.unwrap_or(Err(RpcError::Closed)),
+            _ = self.peer.closed() => Err(RpcError::Closed),
+            _ = cancelled => Err(RpcError::Cancelled),
+        }
+    }
+}
+
+/// Runs its closure when dropped.
+struct Forget<F: FnMut()>(F);
+
+impl<F: FnMut()> Drop for Forget<F> {
+    fn drop(&mut self) {
+        (self.0)();
+    }
+}
+
+#[cfg(test)]
+mod e2e;
+#[cfg(test)]
+mod tests;

crates/ide-agent/src/acp/normalize.rs

@@ -0,0 +1,345 @@
+//! ACP v2 `session/update`s as the v1 updates the timeline folds.
+//!
+//! v2 reports tool calls as upserting `tool_call_update`s (plus appended
+//! `tool_call_content_chunk`s), command output on display terminals, whole
+//! messages next to their chunks, plans by id, and compaction as an entity of its
+//! own. The normalizer keeps what it needs per session to turn each into zero or
+//! more v1 updates: the tool calls it has announced and their content, the text
+//! of each message so far, and each terminal's output.
+
+use serde_json::{Map, Value, json};
+use std::collections::{BTreeSet, HashMap};
+
+/// Terminal output kept per terminal; longer output keeps its tail.
+const MAX_TERMINAL: usize = 64 * 1024;
+
+#[derive(Default)]
+pub(crate) struct Normalizer {
+    sessions: HashMap<String, SessionState>,
+}
+
+#[derive(Default)]
+struct SessionState {
+    /// v2 content of each tool call announced so far.
+    tools: HashMap<String, Vec<Value>>,
+    /// Text so far of each message, by `(chunk kind, messageId)`.
+    messages: HashMap<(String, String), String>,
+    terminals: HashMap<String, Terminal>,
+    /// The plan shown as the v1 `plan`.
+    plan: Option<String>,
+    /// Summary so far of each compaction.
+    compactions: HashMap<String, String>,
+}
+
+#[derive(Default)]
+struct Terminal {
+    output: String,
+    /// Tool calls whose content shows this terminal.
+    tools: BTreeSet<String>,
+}
+
+impl Normalizer {
+    /// The v1 updates for v2 update `update` of session `session`.
+    pub fn normalize(&mut self, session: &str, update: &Value) -> Vec<Value> {
+        let kind = update.get("sessionUpdate").and_then(Value::as_str).unwrap_or_default();
+        let s = self.sessions.entry(session.to_owned()).or_default();
+        match kind {
+            // The echo of a prompt: the client shows its own.
+            "user_message" => Vec::new(),
+            "agent_message_chunk" | "agent_thought_chunk" | "user_message_chunk" => {
+                if let (Some(id), Some(text)) = (str_of(update, "messageId"), update.pointer("/content/text"))
+                    && let Some(text) = text.as_str()
+                {
+                    s.messages.entry((kind.to_owned(), id.to_owned())).or_default().push_str(text);
+                }
+                vec![update.clone()]
+            }
+            "agent_message" | "agent_thought" => {
+                let chunk = format!("{kind}_chunk");
+                let id = str_of(update, "messageId").unwrap_or_default().to_owned();
+                let text = message_text(update.get("content"));
+                let seen = s.messages.entry((chunk.clone(), id)).or_default();
+                // A message replaces what its chunks said; the timeline only appends, so
+                // what the chunks did not say yet goes as one more chunk.
+                let new = match text.strip_prefix(seen.as_str()) {
+                    Some(rest) => rest.to_owned(),
+                    None => text.clone(),
+                };
+                *seen = text;
+                if new.is_empty() {
+                    return Vec::new();
+                }
+                vec![json!({ "sessionUpdate": chunk, "content": { "type": "text", "text": new } })]
+            }
+            "tool_call_update" => {
+                let Some(id) = str_of(update, "toolCallId").map(str::to_owned) else { return Vec::new() };
+                let first = !s.tools.contains_key(&id);
+                let content = s.tools.entry(id.clone()).or_default();
+                let mut out = Map::new();
+                for (k, v) in update.as_object().into_iter().flatten() {
+                    // `null` clears a field in v2; the timeline keeps what it has.
+                    if !v.is_null() && k != "content" {
+                        out.insert(k.clone(), v.clone());
+                    }
+                }
+                let has_content = update.get("content").is_some();
+                if has_content {
+                    *content = update.get("content").and_then(Value::as_array).cloned().unwrap_or_default();
+                }
+                if first {
+                    out.insert("sessionUpdate".into(), json!("tool_call"));
+                    if !out.contains_key("title") {
+                        out.insert("title".into(), json!(str_of(update, "name").unwrap_or_default()));
+                    }
+                }
+                if has_content || first {
+                    s.link_terminals(&id);
+                    out.insert("content".into(), Value::Array(s.v1_content(&id)));
+                }
+                vec![Value::Object(out)]
+            }
+            "tool_call_content_chunk" => {
+                let (Some(id), Some(item)) = (str_of(update, "toolCallId"), update.get("content")) else {
+                    return Vec::new();
+                };
+                let first = !s.tools.contains_key(id);
+                s.tools.entry(id.to_owned()).or_default().push(item.clone());
+                s.link_terminals(id);
+                let mut out =
+                    json!({ "sessionUpdate": "tool_call_update", "toolCallId": id, "content": s.v1_content(id) });
+                if first {
+                    out["sessionUpdate"] = json!("tool_call");
+                    out["title"] = json!("");
+                }
+                vec![out]
+            }
+            "terminal_update" | "terminal_output_chunk" => {
+                let Some(id) = str_of(update, "terminalId") else { return Vec::new() };
+                let terminal = s.terminals.entry(id.to_owned()).or_default();
+                let data = match kind {
+                    "terminal_update" => update.pointer("/output/data"),
+                    _ => update.get("data"),
+                };
+                let Some(data) = data.and_then(Value::as_str) else { return Vec::new() };
+                let text = String::from_utf8_lossy(&base64(data)).into_owned();
+                if kind == "terminal_update" {
+                    terminal.output = text;
+                } else {
+                    terminal.output.push_str(&text);
+                }
+                tail(&mut terminal.output);
+                let tools: Vec<String> = terminal.tools.iter().cloned().collect();
+                tools
+                    .into_iter()
+                    .map(|t| json!({ "sessionUpdate": "tool_call_update", "toolCallId": t, "content": s.v1_content(&t) }))
+                    .collect()
+            }
+            "plan_update" => {
+                let Some(plan) = update.get("plan") else { return Vec::new() };
+                // Markdown and file plans have no v1 form; the tool call that made them shows them.
+                if plan.get("type").and_then(Value::as_str) != Some("items") {
+                    return Vec::new();
+                }
+                s.plan = str_of(plan, "planId").map(str::to_owned);
+                let entries = plan.get("entries").cloned().unwrap_or_else(|| json!([]));
+                vec![json!({ "sessionUpdate": "plan", "entries": entries })]
+            }
+            "plan_removed" => {
+                if s.plan.is_none() || s.plan.as_deref() != str_of(update, "planId") {
+                    return Vec::new();
+                }
+                s.plan = None;
+                vec![json!({ "sessionUpdate": "plan", "entries": [] })]
+            }
+            // The agent compacting its context, as v1 agents report it: a tool call.
+            "compaction_update" | "compaction_summary_chunk" => {
+                let Some(id) = str_of(update, "compactionId") else { return Vec::new() };
+                let tool = format!("compaction:{id}");
+                let first = !s.compactions.contains_key(id);
+                let summary = s.compactions.entry(id.to_owned()).or_default();
+                let mut out = json!({ "sessionUpdate": "tool_call_update", "toolCallId": tool });
+                if kind == "compaction_summary_chunk" {
+                    if let Some(text) = update.pointer("/content/text").and_then(Value::as_str) {
+                        summary.push_str(text);
+                    }
+                } else {
+                    if let Some(blocks) = update.get("summary").filter(|v| v.is_array()) {
+                        *summary = message_text(Some(blocks));
+                    }
+                    let status = match str_of(update, "status") {
+                        Some("completed") => "completed",
+                        Some("failed" | "cancelled") => "failed",
+                        _ => "in_progress",
+                    };
+                    out["status"] = json!(status);
+                    if let Some(error) = str_of(update, "error") {
+                        summary.push_str(error);
+                    }
+                }
+                if !summary.is_empty() {
+                    out["content"] = json!([{ "type": "content", "content": { "type": "text", "text": summary } }]);
+                }
+                if first {
+                    out["sessionUpdate"] = json!("tool_call");
+                    out["title"] = json!("Compact conversation");
+                    out["kind"] = json!("other");
+                }
+                vec![out]
+            }
+            // The turn's state: what ends a prompt (see `Dialect`), not part of the conversation.
+            "state_update" => Vec::new(),
+            // Same shape in both: config options (`configId`), commands (`input.type`),
+            // titles, usage, subagents, session messages, notices; and what v1 doesn't know.
+            _ => vec![update.clone()],
+        }
+    }
+}
+
+impl SessionState {
+    /// Notes which terminals tool call `id` shows.
+    fn link_terminals(&mut self, id: &str) {
+        let content = self.tools.get(id).map(Vec::as_slice).unwrap_or_default();
+        for item in content {
+            if item.get("type").and_then(Value::as_str) == Some("terminal")
+                && let Some(t) = str_of(item, "terminalId")
+            {
+                self.terminals.entry(t.to_owned()).or_default().tools.insert(id.to_owned());
+            }
+        }
+    }
+
+    /// Tool call `id`'s content in v1 form: a terminal as its output so far, a diff per changed file.
+    fn v1_content(&self, id: &str) -> Vec<Value> {
+        let content = self.tools.get(id).map(Vec::as_slice).unwrap_or_default();
+        v1_content(content, &|t| self.terminals.get(t).map(|t| t.output.as_str()))
+    }
+}
+
+/// v2 tool call content in v1 form. `terminal` gives a terminal's output so far.
+pub(crate) fn v1_content<'a>(content: &[Value], terminal: &dyn Fn(&str) -> Option<&'a str>) -> Vec<Value> {
+    let mut out = Vec::new();
+    for item in content {
+        match item.get("type").and_then(Value::as_str) {
+            Some("terminal") => {
+                if let Some(text) = str_of(item, "terminalId").and_then(terminal).filter(|t| !t.is_empty()) {
+                    out.push(json!({ "type": "content", "content": { "type": "text", "text": text } }));
+                }
+            }
+            Some("diff") if item.get("changes").is_some() => out.extend(v1_diffs(item)),
+            _ => out.push(item.clone()),
+        }
+    }
+    out
+}
+
+/// A v2 diff (`changes` and an optional git patch) as v1 diffs, one per changed file. v1
+/// diffs carry texts: each is the patch's hunks for the file, context plus removed lines
+/// before and context plus added lines after, so diffing them counts the patch's lines.
+fn v1_diffs(diff: &Value) -> Vec<Value> {
+    let patch = diff.pointer("/patch/text").and_then(Value::as_str).unwrap_or_default();
+    let files = patch_files(patch);
+    diff.get("changes")
+        .and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .filter_map(|change| {
+            let path = str_of(change, "path")?;
+            // Patch paths can be relative to the repository.
+            let same = |p: &str| !p.is_empty() && (p == path || path.ends_with(&format!("/{p}")));
+            let (old, new) =
+                files.iter().find(|f| same(&f.0)).map(|f| (f.1.as_str(), f.2.as_str())).unwrap_or_default();
+            Some(json!({ "type": "diff", "path": path, "oldText": old, "newText": new }))
+        })
+        .collect()
+}
+
+/// `(path, old text, new text)` of each file in a git patch, from its hunks.
+fn patch_files(patch: &str) -> Vec<(String, String, String)> {
+    let mut files: Vec<(String, String, String)> = Vec::new();
+    let mut in_hunk = false;
+    for line in patch.lines() {
+        if line.starts_with("diff --git ") {
+            files.push((String::new(), String::new(), String::new()));
+            in_hunk = false;
+            continue;
+        }
+        if !in_hunk && let Some(path) = line.strip_prefix("+++ ").or_else(|| line.strip_prefix("--- ")) {
+            let path = path.trim_end();
+            let path = path.strip_prefix("b/").or_else(|| path.strip_prefix("a/")).unwrap_or(path);
+            if files.is_empty() {
+                files.push(Default::default());
+            }
+            if path != "/dev/null"
+                && let Some(f) = files.last_mut()
+            {
+                f.0 = path.to_owned();
+            }
+            continue;
+        }
+        if line.starts_with("@@") {
+            in_hunk = true;
+            continue;
+        }
+        let Some(f) = files.last_mut().filter(|_| in_hunk) else { continue };
+        let (old, new) = (&mut f.1, &mut f.2);
+        match line.as_bytes().first() {
+            Some(b'-') => push_line(old, &line[1..]),
+            Some(b'+') => push_line(new, &line[1..]),
+            Some(b' ') => {
+                push_line(old, &line[1..]);
+                push_line(new, &line[1..]);
+            }
+            _ => {}
+        }
+    }
+    files
+}
+
+fn push_line(text: &mut String, line: &str) {
+    text.push_str(line);
+    text.push('\n');
+}
+
+/// The text of a message's content blocks.
+fn message_text(content: Option<&Value>) -> String {
+    let blocks = content.and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+    blocks.iter().filter_map(|b| b.get("text").and_then(Value::as_str)).collect()
+}
+
+fn str_of<'a>(v: &'a Value, key: &str) -> Option<&'a str> {
+    v.get(key).and_then(Value::as_str)
+}
+
+fn tail(text: &mut String) {
+    if text.len() > MAX_TERMINAL {
+        let mut cut = text.len() - MAX_TERMINAL;
+        while !text.is_char_boundary(cut) {
+            cut += 1;
+        }
+        text.replace_range(..cut, "");
+    }
+}
+
+/// Standard base64 (padding optional); invalid characters are skipped.
+pub(crate) fn base64(data: &str) -> Vec<u8> {
+    let mut out = Vec::with_capacity(data.len() * 3 / 4);
+    let (mut acc, mut bits) = (0u32, 0u32);
+    for b in data.bytes() {
+        let v = match b {
+            b'A'..=b'Z' => b - b'A',
+            b'a'..=b'z' => b - b'a' + 26,
+            b'0'..=b'9' => b - b'0' + 52,
+            b'+' | b'-' => 62,
+            b'/' | b'_' => 63,
+            _ => continue,
+        };
+        acc = (acc << 6) | u32::from(v);
+        bits += 6;
+        if bits >= 8 {
+            bits -= 8;
+            out.push((acc >> bits) as u8);
+            acc &= (1 << bits) - 1;
+        }
+    }
+    out
+}

crates/ide-agent/src/acp/tests.rs

@@ -0,0 +1,529 @@
+//! The dialect layer against frames captured from `claude-agent-acp` 0.97.0
+//! (`tests/fixtures/acp-v2/*.jsonl`: `{ dir, msg }` per line, `in` = agent → client).
+
+use super::normalize::{Normalizer, base64};
+use super::*;
+use crate::conversation::Conversation;
+use crate::model::{AgentEntry, AgentSubagentStatus, AgentToolDiff, AgentToolStatus};
+use crate::timeline::Timeline;
+use ide_core::IpcPath;
+use ide_jsonrpc::Framing;
+use std::time::Duration;
+
+pub(crate) const TURN: &str = include_str!("../../tests/fixtures/acp-v2/turn.jsonl");
+const SUBAGENT: &str = include_str!("../../tests/fixtures/acp-v2/subagent.jsonl");
+const CANCEL: &str = include_str!("../../tests/fixtures/acp-v2/cancel.jsonl");
+const RESUME: &str = include_str!("../../tests/fixtures/acp-v2/resume.jsonl");
+const INITIALIZE_V1: &str = include_str!("../../tests/fixtures/acp-v2/initialize-v1.jsonl");
+
+/// The messages of a fixture going `dir` (`in` or `out`).
+pub(crate) fn frames(fixture: &str, dir: &str) -> Vec<Value> {
+    fixture
+        .lines()
+        .filter(|l| !l.trim().is_empty())
+        .map(|l| serde_json::from_str::<Value>(l).unwrap())
+        .filter(|f| f["dir"] == dir)
+        .map(|f| f["msg"].clone())
+        .collect()
+}
+
+/// The result of request `id` in a fixture.
+fn result(fixture: &str, id: i64) -> Value {
+    frames(fixture, "in").into_iter().find(|m| m["id"] == id && m.get("result").is_some()).unwrap()["result"].clone()
+}
+
+/// The `(session id, update)` of each `session/update` the agent sent.
+fn updates(fixture: &str) -> Vec<(String, Value)> {
+    frames(fixture, "in")
+        .into_iter()
+        .filter(|m| m["method"] == "session/update")
+        .map(|m| (m["params"]["sessionId"].as_str().unwrap().to_owned(), m["params"]["update"].clone()))
+        .collect()
+}
+
+fn tool(entry: &AgentEntry) -> (&str, AgentToolStatus, Option<&str>) {
+    match entry {
+        AgentEntry::Tool { title, status, output, .. } => (title.as_str(), *status, output.as_deref()),
+        other => panic!("not a tool call: {other:?}"),
+    }
+}
+
+#[test]
+fn the_negotiating_request_carries_both_versions() {
+    let p = initialize_params(&json!({ "name": "OpenIDEA", "version": "1.0" }));
+    assert_eq!(p["protocolVersion"], 2);
+    assert_eq!(p["info"]["name"], "OpenIDEA");
+    assert_eq!(p["clientInfo"]["name"], "OpenIDEA");
+    assert!(p["capabilities"].is_object());
+    assert_eq!(p["clientCapabilities"]["subagents"], json!({}));
+    assert_eq!(p["clientCapabilities"]["terminal"], false);
+    // What we sent in the capture is what claude-agent-acp negotiated v2 and v1 from.
+    let sent = &frames(TURN, "out")[0]["params"];
+    assert_eq!(sent["clientCapabilities"], p["clientCapabilities"]);
+}
+
+#[test]
+fn a_v2_initialize_response_reads_as_v1_capabilities() {
+    let n = Negotiated::from_initialize(&result(TURN, 1));
+    assert_eq!(n.generation, 2);
+    assert!(n.load_session());
+    assert!(n.prompt("image") && n.prompt("embeddedContext") && !n.prompt("audio"));
+    assert!(n.session("fork") && n.session("resume") && n.session("close") && n.session("delete"));
+    assert_eq!(n.meta("/claudeCode/promptQueueing"), Some(&json!(true)));
+    assert_eq!(n.agent_info.as_ref().unwrap()["name"], "@agentclientprotocol/claude-agent-acp");
+    assert_eq!(n.capabilities["mcpCapabilities"]["http"], true);
+}
+
+#[test]
+fn a_v1_agent_answers_the_same_request_in_v1() {
+    let response = result(INITIALIZE_V1, 1);
+    let n = Negotiated::from_initialize(&response);
+    assert_eq!(n.generation, 1);
+    assert_eq!(n.capabilities, response["agentCapabilities"]);
+    assert!(n.load_session() && n.prompt("image") && n.session("fork"));
+    assert_eq!(n.meta.as_ref().unwrap()["steering"]["supported"], true);
+}
+
+#[test]
+fn the_shape_decides_the_version_not_the_number() {
+    // Reports version 2 in v1 shape (as Antigravity does).
+    let n = Negotiated::from_initialize(&json!({ "protocolVersion": 2, "agentInfo": { "name": "x" },
+        "agentCapabilities": { "loadSession": true, "promptCapabilities": { "image": true } } }));
+    assert_eq!(n.generation, 1);
+    assert!(n.load_session() && n.prompt("image"));
+    // A bare v1 response.
+    let n = Negotiated::from_initialize(&json!({ "protocolVersion": 1 }));
+    assert_eq!((n.generation, n.load_session(), n.prompt("image")), (1, false, false));
+    // v2 without session capabilities: no resume.
+    let n = Negotiated::from_initialize(&json!({ "protocolVersion": 2, "info": { "name": "x", "version": "1" } }));
+    assert_eq!((n.generation, n.load_session(), n.session("fork")), (2, false, false));
+}
+
+#[test]
+fn meta_and_auth_methods_pass_through() {
+    // The native shims advertise their extensions in `agentCapabilities._meta`.
+    let shim = Negotiated::from_initialize(&json!({ "protocolVersion": 1, "agentCapabilities": {
+        "loadSession": true, "sessionCapabilities": { "fork": {} },
+        "_meta": { "openidea": { "rollback": true, "steer": true } } } }));
+    assert!(shim.meta("/openidea/rollback").is_some() && shim.meta("/openidea/steer").is_some());
+    assert!(shim.session("fork"));
+
+    let v2 = Negotiated::from_initialize(&json!({ "protocolVersion": 2, "info": { "name": "x", "version": "1" },
+        "capabilities": { "session": { "fork": null, "prompt": { "image": null } }, "_meta": { "openidea": { "steer": true } } },
+        "authMethods": [{ "type": "agent", "methodId": "login", "name": "Log in" },
+                        { "type": "terminal", "methodId": "cli", "name": "CLI", "args": ["login"] }] }));
+    assert!(v2.meta("/openidea/steer").is_some());
+    // `null` is "not supported".
+    assert!(!v2.session("fork") && !v2.prompt("image"));
+    assert_eq!(v2.auth_methods[0], json!({ "type": "agent", "id": "login", "name": "Log in" }));
+    assert_eq!(v2.auth_methods[1]["id"], "cli");
+    assert_eq!(v2.auth_methods[1]["args"], json!(["login"]));
+}
+
+/// The captured turn (a Bash command on a display terminal, a Write with a git patch, a
+/// permission request) folds into the same entries a v1 agent's turn does.
+#[test]
+fn a_captured_v2_turn_folds_into_the_timeline() {
+    let mut n = Normalizer::default();
+    let mut t = Timeline::default();
+    for (session, update) in updates(TURN) {
+        for u in n.normalize(&session, &update) {
+            assert_ne!(u["sessionUpdate"], "state_update");
+            assert_ne!(u["sessionUpdate"], "terminal_update");
+            t.apply(&u);
+        }
+    }
+    let e = &t.entries;
+    assert_eq!(e.len(), 4, "{e:#?}");
+    assert_eq!(tool(&e[0]), ("ToolSearch", AgentToolStatus::Completed, Some("No matching deferred tools found")));
+    let (title, status, output) = tool(&e[1]);
+    assert_eq!((title, status), ("echo hello; ls -la /work/proj/note.txt 2>&1", AgentToolStatus::Failed));
+    assert!(output.unwrap().starts_with("Exit code 1\nhello\nls: /private/tmp/"), "{output:?}");
+    let AgentEntry::Tool { title, status, diffs, kind, .. } = &e[2] else { panic!() };
+    assert_eq!(
+        (title.as_str(), *status, kind.as_str()),
+        ("Write /work/proj/note.txt", AgentToolStatus::Completed, "edit")
+    );
+    assert_eq!(diffs, &[AgentToolDiff { path: IpcPath("/work/proj/note.txt".into()), added: 1, removed: 0 }]);
+    assert_eq!(e[3], AgentEntry::Agent { text: "done".into() });
+}
+
+#[test]
+fn a_captured_subagent_gets_its_card_and_timeline() {
+    let mut n = Normalizer::default();
+    let mut c = Conversation::default();
+    let root = updates(SUBAGENT)[0].0.clone();
+    for (session, update) in updates(SUBAGENT) {
+        for u in n.normalize(&session, &update) {
+            c.apply(Some(&session), &u, 1.0);
+        }
+    }
+    let AgentEntry::Subagent { id, title, status, prompt, reply, tools, .. } = &c.main.entries[2] else {
+        panic!("{:#?}", c.main.entries)
+    };
+    assert_eq!((title.as_deref(), *status, *tools), (Some("general-purpose"), AgentSubagentStatus::Done, 1));
+    assert!(prompt.as_deref().unwrap().starts_with("List the files"));
+    assert!(reply.as_deref().unwrap().contains("note.txt"));
+    let child = c.timeline(&Some(id.clone())).unwrap();
+    assert_eq!(tool(&child.entries[1]), ("ls", AgentToolStatus::Completed, Some("note.txt")));
+    // The answer's chunks make one message.
+    let AgentEntry::Agent { text } = c.main.entries.last().unwrap() else { panic!() };
+    assert!(text.starts_with("当前目录里只有一个文件") && text.ends_with("核。"), "{text}");
+    assert_eq!(c.owner(Some(&root)), None);
+}
+
+#[test]
+fn a_replayed_history_clears_each_message_before_its_chunks() {
+    let mut n = Normalizer::default();
+    let mut t = Timeline::default();
+    let replay = updates(RESUME);
+    for (session, update) in &replay {
+        for u in n.normalize(session, update) {
+            t.apply(&u);
+        }
+    }
+    // The resume without a replay sent only its state snapshot; the replay, the history.
+    assert_eq!(replay[0].1, json!({ "sessionUpdate": "state_update", "state": "idle" }));
+    assert_eq!(t.entries.len(), 4);
+    assert_eq!(t.entries[3], AgentEntry::Agent { text: "done".into() });
+}
+
+#[test]
+fn whole_messages_add_only_what_their_chunks_did_not_say() {
+    let mut n = Normalizer::default();
+    let chunk = |id: &str, text: &str| json!({ "sessionUpdate": "agent_message_chunk", "messageId": id, "content": { "type": "text", "text": text } });
+    let message = |kind: &str, id: &str, text: &str| json!({ "sessionUpdate": kind, "messageId": id, "content": [{ "type": "text", "text": text }] });
+    assert_eq!(n.normalize("s", &chunk("m1", "Hel")).len(), 1);
+    let out = n.normalize("s", &message("agent_message", "m1", "Hello"));
+    assert_eq!(out, [json!({ "sessionUpdate": "agent_message_chunk", "content": { "type": "text", "text": "lo" } })]);
+    // Repeated: nothing new.
+    assert!(n.normalize("s", &message("agent_message", "m1", "Hello")).is_empty());
+    // A message never streamed, and a thought.
+    assert_eq!(n.normalize("s", &message("agent_message", "m2", "Hi"))[0]["content"]["text"], "Hi");
+    let thought = n.normalize("s", &message("agent_thought", "m3", "hmm"));
+    assert_eq!(thought[0]["sessionUpdate"], "agent_thought_chunk");
+    // Cleared (replay), then streamed again: the chunks pass.
+    assert!(
+        n.normalize("s", &json!({ "sessionUpdate": "agent_message", "messageId": "m1", "content": [] })).is_empty()
+    );
+    assert_eq!(n.normalize("s", &chunk("m1", "Hello"))[0]["content"]["text"], "Hello");
+    // The prompt's echo is the client's own entry.
+    assert!(n.normalize("s", &message("user_message", "u1", "Fix it")).is_empty());
+}
+
+#[test]
+fn tool_calls_are_announced_once_and_content_chunks_append() {
+    let mut n = Normalizer::default();
+    let out = n.normalize(
+        "s",
+        &json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t", "name": "Read", "status": "pending" }),
+    );
+    assert_eq!(out[0]["sessionUpdate"], "tool_call");
+    assert_eq!(out[0]["title"], "Read", "the name stands in for a missing title");
+    let text = |t: &str| json!({ "type": "content", "content": { "type": "text", "text": t } });
+    let out = n.normalize(
+        "s",
+        &json!({ "sessionUpdate": "tool_call_content_chunk", "toolCallId": "t", "content": text("a") }),
+    );
+    assert_eq!(out[0]["sessionUpdate"], "tool_call_update");
+    n.normalize("s", &json!({ "sessionUpdate": "tool_call_content_chunk", "toolCallId": "t", "content": text("b") }));
+    let out = n.normalize(
+        "s",
+        &json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t", "title": null, "status": "completed" }),
+    );
+    assert_eq!(out[0], json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t", "status": "completed" }));
+    let mut t = Timeline::default();
+    for u in [
+        json!({ "sessionUpdate": "tool_call_update", "toolCallId": "u", "title": "Grep" }),
+        json!({ "sessionUpdate": "tool_call_content_chunk", "toolCallId": "u", "content": text("one") }),
+        json!({ "sessionUpdate": "tool_call_content_chunk", "toolCallId": "u", "content": text("two") }),
+    ] {
+        for v in n.normalize("s", &u) {
+            t.apply(&v);
+        }
+    }
+    assert_eq!(tool(&t.entries[0]).2, Some("one\ntwo"));
+    // Tool calls are per session: a subagent's `t` is another call.
+    assert_eq!(
+        n.normalize("c", &json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t" }))[0]["sessionUpdate"],
+        "tool_call"
+    );
+}
+
+#[test]
+fn terminal_output_reaches_the_tool_calls_that_show_it() {
+    let mut n = Normalizer::default();
+    let mut t = Timeline::default();
+    let data = |s: &str| {
+        // `base64` of `s`, by hand: these are short.
+        const A: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+        let mut out = String::new();
+        for c in s.as_bytes().chunks(3) {
+            let b = [c[0], *c.get(1).unwrap_or(&0), *c.get(2).unwrap_or(&0)];
+            let v = (u32::from(b[0]) << 16) | (u32::from(b[1]) << 8) | u32::from(b[2]);
+            for i in 0..4 {
+                out.push(if i <= c.len() { A[(v >> (18 - 6 * i) & 63) as usize] as char } else { '=' });
+            }
+        }
+        out
+    };
+    for u in [
+        json!({ "sessionUpdate": "terminal_update", "terminalId": "x" }),
+        json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t", "title": "make", "kind": "execute",
+            "content": [{ "type": "terminal", "terminalId": "x" }] }),
+        json!({ "sessionUpdate": "terminal_output_chunk", "terminalId": "x", "data": data("build") }),
+        json!({ "sessionUpdate": "terminal_output_chunk", "terminalId": "x", "data": data("ing…\nok") }),
+        json!({ "sessionUpdate": "terminal_update", "terminalId": "x", "exitStatus": { "exitCode": 0 } }),
+        json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t", "status": "completed" }),
+    ] {
+        for v in n.normalize("s", &u) {
+            t.apply(&v);
+        }
+    }
+    assert_eq!(tool(&t.entries[0]), ("make", AgentToolStatus::Completed, Some("building…\nok")));
+    assert_eq!(base64("aGk="), b"hi");
+    assert_eq!(base64("aGk"), b"hi");
+}
+
+#[test]
+fn item_plans_become_the_plan_and_others_are_left_to_their_tool_call() {
+    let mut n = Normalizer::default();
+    let items = json!({ "sessionUpdate": "plan_update", "plan": { "type": "items", "planId": "plan",
+        "entries": [{ "content": "look", "priority": "medium", "status": "completed" },
+                    { "content": "answer", "priority": "medium", "status": "in_progress" }] } });
+    let out = n.normalize("s", &items);
+    assert_eq!(out, [json!({ "sessionUpdate": "plan", "entries": items["plan"]["entries"] })]);
+    let md =
+        json!({ "sessionUpdate": "plan_update", "plan": { "type": "markdown", "planId": "p2", "content": "# Plan" } });
+    assert!(n.normalize("s", &md).is_empty());
+    assert!(n.normalize("s", &json!({ "sessionUpdate": "plan_removed", "planId": "p2" })).is_empty());
+    let out = n.normalize("s", &json!({ "sessionUpdate": "plan_removed", "planId": "plan" }));
+    assert_eq!(out, [json!({ "sessionUpdate": "plan", "entries": [] })]);
+}
+
+#[test]
+fn a_compaction_shows_as_a_tool_call() {
+    let mut n = Normalizer::default();
+    let mut t = Timeline::default();
+    for u in [
+        json!({ "sessionUpdate": "compaction_update", "compactionId": "c1", "status": "in_progress" }),
+        json!({ "sessionUpdate": "compaction_summary_chunk", "compactionId": "c1", "content": { "type": "text", "text": "Fixed " } }),
+        json!({ "sessionUpdate": "compaction_summary_chunk", "compactionId": "c1", "content": { "type": "text", "text": "the lexer" } }),
+        json!({ "sessionUpdate": "compaction_update", "compactionId": "c1", "status": "completed" }),
+    ] {
+        for v in n.normalize("s", &u) {
+            t.apply(&v);
+        }
+    }
+    assert_eq!(tool(&t.entries[0]), ("Compact conversation", AgentToolStatus::Completed, Some("Fixed the lexer")));
+}
+
+#[test]
+fn git_patches_count_their_lines_per_file() {
+    let patch = "diff --git a/src/a.rs b/src/a.rs\n--- a/src/a.rs\n+++ b/src/a.rs\n@@ -1,3 +1,3 @@\n fn a() {\n-    1\n+    2\n }\n@@ -10,2 +10,3 @@\n x\n+y\n z\ndiff --git a/old.rs b/old.rs\ndeleted file mode 100644\n--- a/old.rs\n+++ /dev/null\n@@ -1,2 +0,0 @@\n-a\n-b\n";
+    let update = json!({ "sessionUpdate": "tool_call_update", "toolCallId": "t", "title": "Edit", "content": [{ "type": "diff",
+        "changes": [{ "operation": "modify", "path": "/repo/src/a.rs" }, { "operation": "delete", "path": "/repo/old.rs" },
+                    { "operation": "add", "path": "/repo/bin.png", "fileType": "binary" }],
+        "patch": { "format": "git_patch", "text": patch } }] });
+    let mut t = Timeline::default();
+    for v in Normalizer::default().normalize("s", &update) {
+        t.apply(&v);
+    }
+    let AgentEntry::Tool { diffs, .. } = &t.entries[0] else { panic!() };
+    let stats: Vec<(&str, u32, u32)> = diffs.iter().map(|d| (d.path.0.to_str().unwrap(), d.added, d.removed)).collect();
+    assert_eq!(stats, [("/repo/src/a.rs", 2, 1), ("/repo/old.rs", 0, 2), ("/repo/bin.png", 0, 0)]);
+}
+
+/// Records what reaches the task's handler.
+#[derive(Default)]
+struct Recorder {
+    seen: parking_lot::Mutex<Vec<(String, Value)>>,
+}
+
+impl Handler for Recorder {
+    fn on_notification(&self, method: &str, params: Value) {
+        self.seen.lock().push((method.to_owned(), params));
+    }
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        self.seen.lock().push((method.to_owned(), params));
+        Ok(json!({ "outcome": { "outcome": "selected", "optionId": "allow-once" } }))
+    }
+}
+
+#[test]
+fn v2_permission_requests_reach_the_task_with_their_tool_call() {
+    let recorder = Arc::new(Recorder::default());
+    let dialect = Dialect::wrap(recorder.clone());
+    dialect.generation.store(2, Ordering::Release);
+    let request = frames(TURN, "in").into_iter().find(|m| m["method"] == "session/request_permission").unwrap();
+    let answer = dialect.on_request("session/request_permission", request["params"].clone()).unwrap();
+    assert_eq!(answer["outcome"]["optionId"], "allow-once");
+    let seen = recorder.seen.lock();
+    let params = &seen[0].1;
+    assert_eq!(params["toolCall"]["title"], "Write /work/proj/note.txt");
+    assert_eq!(params["toolCall"]["toolCallId"], "toolu_01QuF3wSLUeeMp5QTuiNoTBn");
+    assert_eq!(params["toolCall"]["content"][0]["path"], "/work/proj/note.txt");
+    assert_eq!(params["options"].as_array().unwrap().len(), request["params"]["options"].as_array().unwrap().len());
+
+    // A v1 dialect leaves both directions alone.
+    let recorder = Arc::new(Recorder::default());
+    let dialect = Dialect::wrap(recorder.clone());
+    dialect.generation.store(1, Ordering::Release);
+    let update =
+        json!({ "sessionId": "s", "update": { "sessionUpdate": "tool_call", "toolCallId": "t", "title": "x" } });
+    dialect.on_notification("session/update", update.clone());
+    assert_eq!(recorder.seen.lock()[0].1, update);
+}
+
+/// A scripted v2 agent: answers each request from `answers`, and on `session/prompt`
+/// answers at once, then (on its own thread) sends `then`.
+struct ScriptedAgent {
+    peer: std::sync::OnceLock<Peer>,
+    then: parking_lot::Mutex<Vec<Value>>,
+    prompt: Result<Value, (i64, String)>,
+    requests: parking_lot::Mutex<Vec<(String, Value)>>,
+}
+
+impl Handler for ScriptedAgent {
+    fn on_notification(&self, method: &str, params: Value) {
+        self.requests.lock().push((method.to_owned(), params));
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        self.requests.lock().push((method.to_owned(), params.clone()));
+        match method {
+            "initialize" => Ok(result(TURN, 1)),
+            "session/new" => Ok(result(TURN, 2)),
+            "session/resume" => Ok(result(RESUME, 2)),
+            "session/prompt" => {
+                let peer = self.peer.get().unwrap().clone();
+                let then = std::mem::take(&mut *self.then.lock());
+                std::thread::spawn(move || {
+                    std::thread::sleep(Duration::from_millis(20));
+                    for m in then {
+                        peer.notify("session/update", &m).unwrap();
+                    }
+                });
+                self.prompt.clone()
+            }
+            _ => Ok(json!({})),
+        }
+    }
+}
+
+async fn connect(agent: Arc<ScriptedAgent>) -> (Conn, Arc<Recorder>) {
+    let (a, b) = tokio::io::duplex(1 << 20);
+    let (ar, aw) = tokio::io::split(a);
+    let (br, bw) = tokio::io::split(b);
+    let _ = agent.peer.set(Peer::connect_framed(br, bw, agent.clone(), Framing::Lines));
+    let recorder = Arc::new(Recorder::default());
+    let dialect = Dialect::wrap(recorder.clone());
+    let conn = Conn::new(Peer::connect_framed(ar, aw, dialect.clone(), Framing::Lines), dialect);
+    let n = conn.initialize(&json!({ "name": "OpenIDEA", "version": "0" })).await.unwrap();
+    assert_eq!((n.generation, conn.generation()), (2, 2));
+    (conn, recorder)
+}
+
+fn scripted(prompt: Result<Value, (i64, String)>, then: Vec<Value>) -> Arc<ScriptedAgent> {
+    Arc::new(ScriptedAgent {
+        peer: Default::default(),
+        then: parking_lot::Mutex::new(then),
+        prompt,
+        requests: Default::default(),
+    })
+}
+
+fn state(session: &str, state: Value) -> Value {
+    let mut update = json!({ "sessionUpdate": "state_update" });
+    update.as_object_mut().unwrap().extend(state.as_object().unwrap().clone());
+    json!({ "sessionId": session, "update": update })
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_v2_prompt_resolves_when_its_session_goes_idle() {
+    // The captured cancelled turn: running, a cancel, then `idle` with `cancelled`.
+    let session = "caf5db42-df04-40e3-bb8b-e270510e17ca";
+    let tail: Vec<Value> = frames(CANCEL, "in")
+        .into_iter()
+        .skip_while(|m| m["id"] != 4)
+        .filter(|m| m["method"] == "session/update")
+        .map(|m| m["params"].clone())
+        .collect();
+    // A stale snapshot and a subagent's own `idle` come first: neither ends the turn.
+    let mut then = vec![
+        state(session, json!({ "state": "idle" })),
+        state("child", json!({ "state": "idle", "stopReason": "end_turn" })),
+    ];
+    then.extend(tail);
+    let agent = scripted(Ok(result(CANCEL, 4)), then);
+    let (conn, recorder) = connect(agent.clone()).await;
+    let reply: Value =
+        conn.request("session/prompt", json!({ "sessionId": session, "prompt": [] }), None).await.unwrap();
+    assert_eq!(reply["stopReason"], "cancelled");
+    assert!(reply["usage"].is_object());
+    // Everything before the `idle` reached the task first; no state updates did.
+    let seen = recorder.seen.lock();
+    assert!(seen.iter().any(|(_, p)| p["update"]["sessionUpdate"] == "session_info_update"));
+    assert!(seen.iter().all(|(_, p)| p["update"]["sessionUpdate"] != "state_update"));
+    assert!(conn.dialect.turns.lock().is_empty());
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_failed_v2_turn_is_an_error_and_a_queued_cancel_is_a_cancelled_turn() {
+    let failed = state(
+        "s",
+        json!({ "state": "idle", "stopReason": "error",
+        "error": { "code": -32000, "message": "Authentication required" } }),
+    );
+    let agent = scripted(Ok(json!({ "messageId": "m" })), vec![failed]);
+    let (conn, _) = connect(agent).await;
+    let err =
+        conn.request::<_, Value>("session/prompt", json!({ "sessionId": "s", "prompt": [] }), None).await.unwrap_err();
+    assert!(
+        matches!(err, RpcError::Server { code: -32000, ref message, .. } if message == "Authentication required"),
+        "{err:?}"
+    );
+
+    let agent = scripted(Err((codes::REQUEST_CANCELLED, "cancelled".into())), Vec::new());
+    let (conn, _) = connect(agent).await;
+    let reply: Value = conn.request("session/prompt", json!({ "sessionId": "s", "prompt": [] }), None).await.unwrap();
+    assert_eq!(reply["stopReason"], "cancelled");
+
+    // The agent going away fails the turn.
+    let agent = scripted(Ok(json!({ "messageId": "m" })), Vec::new());
+    let (conn, _) = connect(agent.clone()).await;
+    let prompt = conn.request::<_, Value>("session/prompt", json!({ "sessionId": "s", "prompt": [] }), None);
+    let killer = async {
+        tokio::time::sleep(Duration::from_millis(50)).await;
+        agent.peer.get().unwrap().kill();
+    };
+    let (r, ()) = tokio::join!(prompt, killer);
+    assert!(matches!(r, Err(RpcError::Closed)), "{r:?}");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn v1_requests_are_sent_in_v2() {
+    let agent = scripted(Ok(json!({})), Vec::new());
+    let (conn, recorder) = connect(agent.clone()).await;
+    let _: Value = conn.request("session/new", json!({ "cwd": "/p", "mcpServers": [] }), None).await.unwrap();
+    let _: Value =
+        conn.request("session/load", json!({ "sessionId": "s1", "cwd": "/p", "mcpServers": [] }), None).await.unwrap();
+    let _: Value = conn
+        .request("session/set_config_option", json!({ "sessionId": "s1", "configId": "model", "value": "haiku" }), None)
+        .await
+        .unwrap();
+    let _: Value = conn.request("authenticate", json!({ "methodId": "x" }), None).await.unwrap();
+    let requests = agent.requests.lock().clone();
+    let methods: Vec<&str> = requests.iter().map(|(m, _)| m.as_str()).collect();
+    assert_eq!(methods, ["initialize", "session/new", "session/resume", "session/set_config_option", "auth/login"]);
+    assert!(requests[2].1.get("replayFrom").is_none(), "resumed without a replay");
+    assert_eq!(requests[3].1["type"], "id");
+    // The commands of both setup responses, as v1 updates.
+    let seen = recorder.seen.lock();
+    let commands: Vec<&Value> = seen
+        .iter()
+        .filter(|(_, p)| p["update"]["sessionUpdate"] == "available_commands_update")
+        .map(|(_, p)| &p["sessionId"])
+        .collect();
+    assert_eq!(commands, [&json!("28846a4c-c3e8-4a45-a3d0-c19f10d19d1a"), &json!("s1")]);
+}

crates/ide-agent/src/config.rs

@@ -0,0 +1,260 @@
+//! Session settings (model, mode, thinking effort…), slash commands and context use, as
+//! the agent reports them over ACP.
+
+use crate::model::{AgentCommand, AgentConfigOption, AgentConfigValue, AgentConfigVia, AgentUsage};
+use serde_json::{Value, json};
+
+/// Cursor exposes execution modes over ACP, but leaves approval policy to its client.
+pub(crate) const CURSOR_APPROVAL: &str = "openidea.cursor.approval";
+
+pub(crate) fn add_client_options(provider: &str, config: &mut Vec<AgentConfigOption>) {
+    if provider != "cursor" || config.iter().any(|o| o.id == CURSOR_APPROVAL) {
+        return;
+    }
+    config.push(AgentConfigOption {
+        id: CURSOR_APPROVAL.into(),
+        name: "Approvals".into(),
+        description: Some("Tool approvals for this Cursor conversation".into()),
+        category: Some("approval".into()),
+        current: Some("ask".into()),
+        via: AgentConfigVia::Option,
+        values: vec![
+            AgentConfigValue {
+                value: "ask".into(),
+                name: "Ask for approval".into(),
+                description: Some("Show permission requests from Cursor".into()),
+            },
+            AgentConfigValue {
+                value: "bypass".into(),
+                name: "Bypass approvals".into(),
+                description: Some("Automatically approve tool requests in this conversation".into()),
+            },
+        ],
+    });
+}
+
+pub(crate) fn bypass_approvals(provider: &str, config: &[AgentConfigOption]) -> bool {
+    provider == "cursor" && config.iter().any(|o| o.id == CURSOR_APPROVAL && o.current.as_deref() == Some("bypass"))
+}
+
+/// The mode that approves everything without asking (`bypassPermissions`, `yolo`, `full-access`…), if the agent has one.
+pub(crate) fn bypass_mode(options: &[AgentConfigOption]) -> Option<(&AgentConfigOption, &AgentConfigValue)> {
+    let option = options.iter().find(|o| o.category.as_deref() == Some("mode"))?;
+    let value = option.values.iter().find(|v| {
+        let m: String = v.value.to_lowercase().chars().filter(char::is_ascii_lowercase).collect();
+        m.contains("bypass") || m == "yolo" || m.contains("fullaccess") || m == "dangerous"
+    })?;
+    Some((option, value))
+}
+
+/// The settings in a `session/new` or `session/load` result: its select `configOptions`,
+/// plus the older `modes` / `models` fields for what those don't cover.
+pub(crate) fn options_of(result: &Value) -> Vec<AgentConfigOption> {
+    let mut out = result.get("configOptions").map(parse_options).unwrap_or_default();
+    let has = |out: &[AgentConfigOption], category: &str| out.iter().any(|o| o.category.as_deref() == Some(category));
+    if !has(&out, "mode")
+        && let Some(modes) = result.get("modes")
+    {
+        out.push(legacy(modes, "mode", "Mode", "availableModes", "id", "currentModeId", AgentConfigVia::Mode));
+    }
+    if !has(&out, "model")
+        && let Some(models) = result.get("models")
+    {
+        out.push(legacy(
+            models,
+            "model",
+            "Model",
+            "availableModels",
+            "modelId",
+            "currentModelId",
+            AgentConfigVia::Model,
+        ));
+    }
+    out.retain(|o| !o.values.is_empty());
+    out
+}
+
+/// A `configOptions` array; only select options are kept (the UI shows them as dropdowns).
+pub(crate) fn parse_options(options: &Value) -> Vec<AgentConfigOption> {
+    let Some(list) = options.as_array() else { return Vec::new() };
+    list.iter()
+        .filter(|o| o.get("type").and_then(Value::as_str).is_none_or(|t| t == "select"))
+        .filter_map(|o| {
+            let id = o.get("id").or_else(|| o.get("configId")).and_then(Value::as_str)?.to_owned();
+            let mut values = Vec::new();
+            for v in o.get("options").and_then(Value::as_array).into_iter().flatten() {
+                // Grouped options: `{ group, name, options: [...] }`.
+                match v.get("options").and_then(Value::as_array) {
+                    Some(group) => values.extend(group.iter().filter_map(value_of)),
+                    None => values.extend(value_of(v)),
+                }
+            }
+            Some(AgentConfigOption {
+                name: str_of(o, "name").unwrap_or_else(|| id.clone()),
+                description: str_of(o, "description"),
+                category: str_of(o, "category").or_else(|| matches!(id.as_str(), "model" | "mode").then(|| id.clone())),
+                current: str_of(o, "currentValue"),
+                values,
+                via: AgentConfigVia::Option,
+                id,
+            })
+        })
+        .collect()
+}
+
+/// A `config_option_update`: its options replace the config-option ones; `modes` / `models`
+/// stand-ins stay.
+pub(crate) fn merge_update(config: &mut Vec<AgentConfigOption>, options: &Value) {
+    let fresh = parse_options(options);
+    let covered = |o: &AgentConfigOption| fresh.iter().any(|f| f.category.is_some() && f.category == o.category);
+    config.retain(|o| o.id == CURSOR_APPROVAL || (o.via != AgentConfigVia::Option && !covered(o)));
+    let legacy = std::mem::take(config);
+    config.extend(fresh);
+    config.extend(legacy);
+    config.retain(|o| !o.values.is_empty());
+}
+
+/// `current_mode_update`.
+pub(crate) fn set_mode(config: &mut [AgentConfigOption], mode: &str) {
+    if let Some(o) = config.iter_mut().find(|o| o.category.as_deref() == Some("mode")) {
+        o.current = Some(mode.to_owned());
+    }
+}
+
+/// The request (method, params without the session id) that sets `option` to `value`.
+pub(crate) fn set_request(option: &AgentConfigOption, value: &str) -> (&'static str, Value) {
+    match option.via {
+        AgentConfigVia::Option => ("session/set_config_option", json!({ "configId": option.id, "value": value })),
+        AgentConfigVia::Mode => ("session/set_mode", json!({ "modeId": value })),
+        AgentConfigVia::Model => ("session/set_model", json!({ "modelId": value })),
+    }
+}
+
+/// `available_commands_update`.
+pub(crate) fn commands_of(update: &Value) -> Vec<AgentCommand> {
+    update
+        .get("availableCommands")
+        .and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .filter_map(|c| {
+            Some(AgentCommand {
+                name: c.get("name")?.as_str()?.trim_start_matches('/').to_owned(),
+                description: str_of(c, "description").unwrap_or_default(),
+                hint: c.pointer("/input/hint").and_then(Value::as_str).filter(|h| !h.is_empty()).map(str::to_owned),
+            })
+        })
+        .collect()
+}
+
+/// `usage_update`: `{ used, size }`.
+pub(crate) fn usage_of(update: &Value) -> Option<AgentUsage> {
+    let tokens = |key: &str| update.get(key)?.as_f64().map(|n| n.clamp(0.0, f64::from(u32::MAX)) as u32);
+    Some(AgentUsage { used: tokens("used")?, size: tokens("size").filter(|s| *s > 0)? })
+}
+
+fn legacy(
+    v: &Value,
+    id: &str,
+    name: &str,
+    list: &str,
+    key: &str,
+    current: &str,
+    via: AgentConfigVia,
+) -> AgentConfigOption {
+    let values = v
+        .get(list)
+        .and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .filter_map(|m| {
+            let value = m.get(key)?.as_str()?.to_owned();
+            Some(AgentConfigValue {
+                name: str_of(m, "name").unwrap_or_else(|| value.clone()),
+                description: str_of(m, "description"),
+                value,
+            })
+        })
+        .collect();
+    AgentConfigOption {
+        id: id.to_owned(),
+        name: name.to_owned(),
+        description: None,
+        category: Some(id.to_owned()),
+        current: str_of(v, current),
+        values,
+        via,
+    }
+}
+
+fn value_of(v: &Value) -> Option<AgentConfigValue> {
+    let value = v.get("value")?.as_str()?.to_owned();
+    Some(AgentConfigValue {
+        name: str_of(v, "name").unwrap_or_else(|| value.clone()),
+        description: str_of(v, "description"),
+        value,
+    })
+}
+
+fn str_of(v: &Value, key: &str) -> Option<String> {
+    v.get(key).and_then(Value::as_str).map(str::to_owned)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn ids(c: &[AgentConfigOption]) -> Vec<(&str, Option<&str>)> {
+        c.iter().map(|o| (o.id.as_str(), o.current.as_deref())).collect()
+    }
+
+    #[test]
+    fn config_options_win_over_the_older_fields() {
+        let r = json!({
+            "modes": {"currentModeId": "default", "availableModes": [{"id": "default", "name": "Manual"}]},
+            "configOptions": [
+                {"id": "mode", "category": "mode", "type": "select", "currentValue": "plan",
+                 "options": [{"value": "default", "name": "Manual"}, {"value": "plan", "name": "Plan"}]},
+                {"id": "effort", "category": "thought_level", "type": "select", "currentValue": "medium",
+                 "options": [{"group": "g", "name": "G", "options": [{"value": "low"}, {"value": "medium", "name": "Medium"}]}]},
+                {"id": "fast", "type": "boolean", "currentValue": false}
+            ],
+            "models": {"currentModelId": "m1", "availableModels": [{"modelId": "m1", "name": "One"}]}
+        });
+        let c = options_of(&r);
+        assert_eq!(ids(&c), [("mode", Some("plan")), ("effort", Some("medium")), ("model", Some("m1"))]);
+        assert_eq!(c[1].values.iter().map(|v| v.name.as_str()).collect::<Vec<_>>(), ["low", "Medium"]);
+        assert_eq!(set_request(&c[0], "default").0, "session/set_config_option");
+        assert_eq!(set_request(&c[2], "m1"), ("session/set_model", json!({"modelId": "m1"})));
+    }
+
+    #[test]
+    fn updates_replace_options_and_track_the_mode() {
+        let mut c = options_of(&json!({
+            "modes": {"currentModeId": "ask", "availableModes": [{"id": "ask"}, {"id": "code"}]},
+            "configOptions": [{"id": "model", "type": "select", "currentValue": "a", "options": [{"value": "a"}]}]
+        }));
+        assert_eq!(c[0].category.as_deref(), Some("model"), "the category defaults from the id");
+        set_mode(&mut c, "code");
+        assert_eq!(c[1].current.as_deref(), Some("code"));
+        assert_eq!(set_request(&c[1], "ask").0, "session/set_mode");
+        merge_update(
+            &mut c,
+            &json!([{"id": "model", "type": "select", "currentValue": "b", "options": [{"value": "b"}]}]),
+        );
+        assert_eq!(ids(&c), [("model", Some("b")), ("mode", Some("code"))]);
+    }
+
+    #[test]
+    fn commands_and_usage() {
+        let cmds = commands_of(&json!({"availableCommands": [
+            {"name": "review", "description": "Review changes", "input": {"hint": "what to review"}},
+            {"name": "/init", "description": "Write CLAUDE.md", "input": null}
+        ]}));
+        assert_eq!(cmds[0].hint.as_deref(), Some("what to review"));
+        assert_eq!((cmds[1].name.as_str(), cmds[1].hint.as_ref()), ("init", None));
+        let u = usage_of(&json!({"used": 1200, "size": 200000, "cost": {"amount": 0.42, "currency": "USD"}})).unwrap();
+        assert_eq!((u.used, u.size), (1200, 200000));
+        assert!(usage_of(&json!({"used": 1, "size": 0})).is_none());
+    }
+}

crates/ide-agent/src/conversation.rs

@@ -0,0 +1,294 @@
+//! A task's conversation and those of its subagents.
+//!
+//! An agent that supports ACP subagent sessions runs each subagent (Claude Code's Agent
+//! tool, Codex's spawned agents) as a child session: `subagent_update` on the parent
+//! announces it and reports its state, its own updates carry its session id, and
+//! `session_message`s carry what it was asked and what it answered. The parent's
+//! timeline shows a card per subagent; each subagent keeps its own timeline.
+
+use crate::model::AgentEntry;
+use crate::timeline::{Timeline, blocks_text, content_text};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+
+/// Where an entry lives: the task's own conversation (`None`) or a subagent's session.
+pub(crate) type Session = Option<String>;
+
+#[derive(Default)]
+pub(crate) struct Conversation {
+    pub main: Timeline,
+    /// In the order they started.
+    subagents: Vec<Subagent>,
+}
+
+struct Subagent {
+    id: String,
+    /// The session that started it.
+    parent: Session,
+    timeline: Timeline,
+}
+
+/// A subagent's conversation, as saved with its task.
+#[derive(Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub(crate) struct SavedSubagent {
+    pub id: String,
+    pub parent: Option<String>,
+    pub entries: Vec<AgentEntry>,
+}
+
+impl Conversation {
+    pub fn restore(main: Vec<AgentEntry>, subagents: Vec<SavedSubagent>) -> Self {
+        Self {
+            main: Timeline::from_entries(main),
+            subagents: subagents
+                .into_iter()
+                .map(|s| Subagent { id: s.id, parent: s.parent, timeline: Timeline::from_entries(s.entries) })
+                .collect(),
+        }
+    }
+
+    pub fn saved_subagents(&self) -> Vec<SavedSubagent> {
+        self.subagents
+            .iter()
+            .map(|s| SavedSubagent { id: s.id.clone(), parent: s.parent.clone(), entries: s.timeline.entries.clone() })
+            .collect()
+    }
+
+    pub fn timeline(&self, session: &Session) -> Option<&Timeline> {
+        match session {
+            None => Some(&self.main),
+            Some(id) => self.subagents.iter().find(|s| &s.id == id).map(|s| &s.timeline),
+        }
+    }
+
+    fn timeline_mut(&mut self, session: &Session) -> Option<&mut Timeline> {
+        match session {
+            None => Some(&mut self.main),
+            Some(id) => self.subagents.iter_mut().find(|s| &s.id == id).map(|s| &mut s.timeline),
+        }
+    }
+
+    fn parent_of(&self, id: &str) -> Option<&Session> {
+        self.subagents.iter().find(|s| s.id == id).map(|s| &s.parent)
+    }
+
+    /// The session an update for session id `session` belongs to: a known subagent's, else the task's.
+    pub fn owner(&self, session: Option<&str>) -> Session {
+        session.filter(|s| self.parent_of(s).is_some()).map(str::to_owned)
+    }
+
+    /// The parent's title (or description) for subagent `id`.
+    pub fn label(&self, id: &str) -> Option<String> {
+        let parent = self.parent_of(id)?;
+        self.timeline(parent)?.entries.iter().find_map(|e| match e {
+            AgentEntry::Subagent { id: card, title, description, .. } if card == id => {
+                title.clone().or_else(|| description.clone())
+            }
+            _ => None,
+        })
+    }
+
+    /// Applies one `session/update` of session id `session` (the task's own when unknown);
+    /// returns the entries it added or changed.
+    pub fn apply(&mut self, session: Option<&str>, update: &Value, now: f64) -> Vec<(Session, usize)> {
+        let owner = self.owner(session);
+        let kind = update.get("sessionUpdate").and_then(Value::as_str).unwrap_or_default();
+        let mut out = Vec::new();
+        match kind {
+            "subagent_update" => {
+                let Some(id) = update.get("sessionId").and_then(Value::as_str) else { return out };
+                if self.parent_of(id).is_none() {
+                    self.subagents.push(Subagent { id: id.to_owned(), parent: owner, timeline: Timeline::default() });
+                }
+                let parent = self.parent_of(id).cloned().flatten();
+                let Some(timeline) = self.timeline_mut(&parent) else { return out };
+                let (index, stopped) = timeline.subagent(id, update, now);
+                out.push((parent, index));
+                if stopped && let Some(child) = self.timeline_mut(&Some(id.to_owned())) {
+                    let id = Some(id.to_owned());
+                    out.extend(child.end_turn(None).into_iter().map(|i| (id.clone(), i)));
+                }
+            }
+            "session_message" | "session_message_chunk" => {
+                let append = kind == "session_message_chunk";
+                let text = if append {
+                    content_text(update.get("content")).unwrap_or_default()
+                } else {
+                    blocks_text(update.get("content"))
+                };
+                let field = |k: &str| update.get(k).and_then(Value::as_str).map(str::to_owned);
+                let (sender, recipient) = (field("senderSessionId"), field("recipientSessionId"));
+                let ours =
+                    |s: &Option<String>| s.as_deref().filter(|s| self.parent_of(s) == Some(&owner)).map(str::to_owned);
+                // Between this session and a subagent of it: the subagent's task or answer, on its card.
+                let card = ours(&recipient).map(|c| (c, false)).or_else(|| ours(&sender).map(|c| (c, true)));
+                let Some(timeline) = self.timeline_mut(&owner) else { return out };
+                let index = match card {
+                    Some((child, reply)) => timeline.card_message(&child, reply, &text, append),
+                    None => {
+                        let id = field("messageId").unwrap_or_default();
+                        Some(timeline.message(&id, sender != owner, &text, append))
+                    }
+                };
+                out.extend(index.map(|i| (owner, i)));
+            }
+            _ => {
+                let Some(timeline) = self.timeline_mut(&owner) else { return out };
+                out.extend(timeline.apply(update).changed.into_iter().map(|i| (owner.clone(), i)));
+                if let Some(id) = owner.as_deref()
+                    && matches!(kind, "tool_call" | "tool_call_update")
+                {
+                    out.extend(self.refresh_card(id));
+                }
+            }
+        }
+        out
+    }
+
+    /// Updates subagent `id`'s card from its timeline.
+    fn refresh_card(&mut self, id: &str) -> Option<(Session, usize)> {
+        let parent = self.parent_of(id)?.clone();
+        let child = self.subagents.iter().position(|s| s.id == id)?;
+        let timeline = std::mem::take(&mut self.subagents[child].timeline);
+        let changed = self.timeline_mut(&parent).and_then(|p| p.card_activity(id, &timeline));
+        self.subagents[child].timeline = timeline;
+        changed.map(|i| (parent, i))
+    }
+
+    /// Keeps the task's first `len` entries, and the subagents still shown in them.
+    pub fn truncate(&mut self, len: usize) {
+        let mut entries = std::mem::take(&mut self.main.entries);
+        entries.truncate(len);
+        self.main = Timeline::from_entries(entries);
+        let shown = |c: &Conversation, id: &str| {
+            c.main.entries.iter().any(|e| matches!(e, AgentEntry::Subagent { id: card, .. } if card == id))
+        };
+        let keep: Vec<bool> = self.subagents.iter().map(|s| s.parent.is_some() || shown(self, &s.id)).collect();
+        let mut keep = keep.into_iter();
+        self.subagents.retain(|_| keep.next().unwrap_or(true));
+    }
+
+    /// Settles what an ended turn of the task left open. Subagents work on (in the background).
+    pub fn end_turn(&mut self, done: Option<f64>) -> Vec<(Session, usize)> {
+        self.main.end_turn(done).into_iter().map(|i| (None, i)).collect()
+    }
+
+    /// Settles everything left open once the agent is gone, subagents included.
+    pub fn settle(&mut self, now: f64) -> Vec<(Session, usize)> {
+        let mut out: Vec<(Session, usize)> = self.main.end_turn(None).into_iter().map(|i| (None, i)).collect();
+        out.extend(self.main.stop_subagents(now).into_iter().map(|i| (None, i)));
+        for s in &mut self.subagents {
+            let id = Some(s.id.clone());
+            let mut changed = s.timeline.end_turn(None);
+            changed.extend(s.timeline.stop_subagents(now));
+            out.extend(changed.into_iter().map(|i| (id.clone(), i)));
+        }
+        out
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::model::{AgentSubagentStatus, AgentToolStatus};
+    use serde_json::json;
+
+    fn card(c: &Conversation, session: &Session, index: usize) -> AgentEntry {
+        c.timeline(session).unwrap().entries[index].clone()
+    }
+
+    /// Claude Code's Agent tool, as `claude-agent-acp` reports it to a client with subagent sessions.
+    #[test]
+    fn a_subagent_gets_a_card_in_its_parent_and_its_own_timeline() {
+        let mut c = Conversation::default();
+        let sub = Some("child".to_owned());
+        let announce = json!({"sessionUpdate": "subagent_update", "sessionId": "child", "title": "Explore",
+            "description": "Find the parser", "capabilities": {"cancel": {}}, "state": {"state": "running"}});
+        assert_eq!(c.apply(Some("root"), &announce, 10.0), vec![(None, 0)]);
+        // The launch prompt: the parent's outgoing view, then the child's incoming one.
+        let prompt = json!({"sessionUpdate": "session_message", "messageId": "toolu_1",
+            "senderSessionId": "root", "recipientSessionId": "child",
+            "content": [{"type": "text", "text": "Look for it"}]});
+        assert_eq!(c.apply(Some("root"), &prompt, 11.0), vec![(None, 0)]);
+        assert_eq!(c.apply(Some("child"), &prompt, 11.0), vec![(sub.clone(), 0)]);
+        assert_eq!(card(&c, &sub, 0), AgentEntry::Message { incoming: true, text: "Look for it".into() });
+
+        // The child's own work stays out of the parent's timeline; its card follows it.
+        c.apply(
+            Some("child"),
+            &json!({"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "hm"}}),
+            12.0,
+        );
+        let changed = c.apply(
+            Some("child"),
+            &json!({"sessionUpdate": "tool_call", "toolCallId": "t1", "title": "Read lib.rs", "kind": "read", "status": "in_progress"}),
+            12.0,
+        );
+        assert_eq!(changed, vec![(sub.clone(), 2), (None, 0)]);
+        assert_eq!(c.main.entries.len(), 1);
+        // Settings of the child session don't touch the task.
+        assert_eq!(c.owner(Some("child")), sub);
+        assert_eq!(c.owner(Some("root")), None);
+
+        let done = json!({"sessionUpdate": "subagent_update", "sessionId": "child", "state": {"state": "idle", "stopReason": "end_turn"}});
+        let changed = c.apply(Some("root"), &done, 20.0);
+        // Its tool calls left open are settled when it stops.
+        assert_eq!(changed, vec![(None, 0), (sub.clone(), 2)]);
+        let reply = json!({"sessionUpdate": "session_message", "messageId": "toolu_1:reply", "senderSessionId": "child",
+            "recipientSessionId": "root", "content": [{"type": "text", "text": "In "}, {"type": "text", "text": "parser.rs"}]});
+        c.apply(Some("root"), &reply, 20.0);
+        assert_eq!(
+            c.main.entries[0],
+            AgentEntry::Subagent {
+                id: "child".into(),
+                title: Some("Explore".into()),
+                description: Some("Find the parser".into()),
+                status: AgentSubagentStatus::Done,
+                error: None,
+                prompt: Some("Look for it".into()),
+                reply: Some("In \nparser.rs".into()),
+                tools: 1,
+                activity: Some("Read lib.rs".into()),
+                started_ms: 10.0,
+                ended_ms: Some(20.0),
+                cancellable: true,
+            }
+        );
+        assert_eq!(c.label("child").as_deref(), Some("Explore"));
+    }
+
+    #[test]
+    fn nested_subagents_and_failures() {
+        let mut c = Conversation::default();
+        c.apply(
+            None,
+            &json!({"sessionUpdate": "subagent_update", "sessionId": "a", "state": {"state": "running"}}),
+            1.0,
+        );
+        c.apply(
+            Some("a"),
+            &json!({"sessionUpdate": "subagent_update", "sessionId": "b", "description": "deeper"}),
+            2.0,
+        );
+        let a = Some("a".to_owned());
+        assert!(matches!(card(&c, &a, 0), AgentEntry::Subagent { ref id, .. } if id == "b"));
+        let failed = json!({"sessionUpdate": "subagent_update", "sessionId": "b",
+            "state": {"state": "idle", "stopReason": "error", "error": {"code": -32603, "message": "boom"}}});
+        assert_eq!(c.apply(Some("a"), &failed, 3.0), vec![(a.clone(), 0)]);
+        assert!(matches!(card(&c, &a, 0),
+            AgentEntry::Subagent { status: AgentSubagentStatus::Failed, error: Some(ref e), ended_ms: Some(3.0), .. } if e == "boom"));
+
+        // Saved and restored, then the agent is gone: what still works is stopped.
+        let mut c = Conversation::restore(c.main.entries.clone(), c.saved_subagents());
+        c.apply(
+            Some("a"),
+            &json!({"sessionUpdate": "tool_call", "toolCallId": "t", "title": "Run", "status": "in_progress"}),
+            4.0,
+        );
+        let settled = c.settle(9.0);
+        assert_eq!(settled, vec![(None, 0), (a.clone(), 1)]);
+        assert!(matches!(c.main.entries[0], AgentEntry::Subagent { status: AgentSubagentStatus::Cancelled, .. }));
+        assert!(matches!(card(&c, &a, 1), AgentEntry::Tool { status: AgentToolStatus::Failed, .. }));
+    }
+}

crates/ide-agent/src/model.rs

@@ -0,0 +1,416 @@
+//! IPC types: tasks, their timeline entries and the events streamed to the UI.
+
+use ide_core::IpcPath;
+use serde::{Deserialize, Serialize};
+use specta::Type;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum AgentStatus {
+    /// Creating the worktree / starting the agent.
+    Starting,
+    Running,
+    /// Waiting for a permission answer.
+    NeedsInput,
+    /// The turn ended; the result can be reviewed or the conversation continued.
+    Ready,
+    Failed,
+    /// The account's usage limit was reached; the conversation can go on once it resets.
+    Limited,
+    Archived,
+}
+
+/// What a task's agent can do beyond a plain conversation, as it reported when its
+/// session started.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase", default)]
+pub struct AgentCapabilities {
+    /// Images in messages.
+    pub images: bool,
+    /// The conversation can be copied into a new task (`session/fork`).
+    pub fork: bool,
+    /// Its latest turns can be dropped.
+    pub rollback: bool,
+    /// A message can join the running turn instead of waiting for it.
+    pub steer: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum Isolation {
+    /// A new git worktree on its own branch.
+    Worktree,
+    /// The project's own checkout.
+    Local,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentTask {
+    /// Original project folder; absent in tasks saved before per-task roots.
+    #[serde(default)]
+    pub project_root: Option<IpcPath>,
+    pub id: String,
+    pub title: String,
+    /// [`AgentProvider::id`].
+    pub provider: String,
+    /// Model the task runs on (its `model` setting), when known.
+    pub model: Option<String>,
+    pub status: AgentStatus,
+    pub isolation: Isolation,
+    /// Directory the agent works in (the worktree, or the project root).
+    pub cwd: IpcPath,
+    /// Branch of the task's worktree.
+    pub branch: Option<String>,
+    /// Branch (or revision) the worktree was created from.
+    pub base: Option<String>,
+    /// Commit the task's changes are compared against (worktree tasks; local ones use `HEAD`).
+    pub base_commit: Option<String>,
+    /// Why the task failed, when it did.
+    pub error: Option<String>,
+    pub created_ms: f64,
+    pub updated_ms: f64,
+    /// The session's settings (model, mode, thinking effort…) as last reported, with the
+    /// user's choices applied.
+    pub config: Vec<AgentConfigOption>,
+    /// Slash commands the agent offers.
+    pub commands: Vec<AgentCommand>,
+    /// Context window use, when the agent reports it.
+    pub usage: Option<AgentUsage>,
+    /// Messages waiting for the current turn to end, oldest first.
+    pub queue: Vec<AgentQueued>,
+    #[serde(default)]
+    pub capabilities: AgentCapabilities,
+    /// When a [`AgentStatus::Limited`] task's limit resets (ms since the epoch), if the agent said.
+    #[serde(default)]
+    pub resets_ms: Option<f64>,
+    /// The agent is retrying a failed API request (connection lost, overloaded…); cleared
+    /// by its next output or any status change.
+    #[serde(default)]
+    pub retry: Option<AgentRetry>,
+}
+
+/// An API request the agent is about to retry.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentRetry {
+    pub attempt: u32,
+    pub max_retries: Option<u32>,
+    /// When the next attempt starts (ms since the epoch).
+    pub retry_at_ms: f64,
+    pub error: Option<String>,
+}
+
+/// One value of a select-type session setting.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentConfigValue {
+    pub value: String,
+    pub name: String,
+    pub description: Option<String>,
+}
+
+/// How a setting is changed.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum AgentConfigVia {
+    /// `session/set_config_option`.
+    #[default]
+    Option,
+    /// `session/set_mode` (agents that report `modes` instead of a mode config option).
+    Mode,
+    /// `session/set_model` (agents that report `models` instead of a model config option).
+    Model,
+}
+
+/// A session setting: an ACP select config option, or the older `modes` / `models`.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentConfigOption {
+    pub id: String,
+    pub name: String,
+    pub description: Option<String>,
+    /// ACP category: `model`, `mode`, `thought_level`, or agent-specific.
+    pub category: Option<String>,
+    pub current: Option<String>,
+    pub values: Vec<AgentConfigValue>,
+    pub via: AgentConfigVia,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentCommand {
+    /// Without the leading `/`.
+    pub name: String,
+    pub description: String,
+    /// What to type after the command, when it takes input.
+    pub hint: Option<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentUsage {
+    /// Tokens in the context window.
+    pub used: u32,
+    /// Size of the context window.
+    pub size: u32,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentImage {
+    pub mime_type: String,
+    /// Base64, without a `data:` prefix.
+    pub data: String,
+    pub name: Option<String>,
+}
+
+/// A message to the agent: text, plus files to look at and images.
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentPrompt {
+    pub text: String,
+    pub files: Vec<IpcPath>,
+    pub images: Vec<AgentImage>,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentQueued {
+    pub id: String,
+    pub prompt: AgentPrompt,
+}
+
+/// A setting chosen for a new task, by [`AgentConfigOption::id`].
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentConfigChoice {
+    pub id: String,
+    pub value: String,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum AgentToolStatus {
+    Pending,
+    Running,
+    Completed,
+    Failed,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentToolDiff {
+    pub path: IpcPath,
+    pub added: u32,
+    pub removed: u32,
+}
+
+/// What a subagent is doing, as its parent reports it.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum AgentSubagentStatus {
+    Running,
+    /// One of its requests (a permission) waits for an answer.
+    NeedsInput,
+    Done,
+    Cancelled,
+    Failed,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentPlanItem {
+    pub content: String,
+    /// `pending`, `in_progress` or `completed`.
+    pub status: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentPermissionOption {
+    pub id: String,
+    pub name: String,
+    /// `allow_once`, `allow_always`, `reject_once` or `reject_always`.
+    pub kind: String,
+}
+
+/// One item of a task's conversation.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(tag = "type", rename_all = "camelCase", rename_all_fields = "camelCase")]
+pub enum AgentEntry {
+    User {
+        text: String,
+        /// Names of the files and images sent with it.
+        attachments: Vec<String>,
+        /// The images sent with it, shown in the conversation.
+        #[serde(default)]
+        images: Vec<AgentImage>,
+        /// When it was sent (ms since the epoch); `None` in tasks saved before this was kept.
+        #[serde(default)]
+        sent_ms: Option<f64>,
+        /// When the turn it started ended; `None` while it runs or when it was cut off.
+        #[serde(default)]
+        done_ms: Option<f64>,
+        /// Sent into a running turn rather than starting one.
+        #[serde(default)]
+        steered: bool,
+    },
+    Agent {
+        text: String,
+    },
+    Thought {
+        text: String,
+    },
+    Tool {
+        id: String,
+        title: String,
+        /// ACP tool kind: `read`, `edit`, `execute`, `search`, `fetch`, `think`…
+        kind: String,
+        status: AgentToolStatus,
+        locations: Vec<IpcPath>,
+        /// Text the tool reported (command output…), truncated.
+        output: Option<String>,
+        diffs: Vec<AgentToolDiff>,
+    },
+    Plan {
+        items: Vec<AgentPlanItem>,
+    },
+    /// A subagent the agent started: its own session, whose entries are listed separately.
+    Subagent {
+        /// The subagent's session id.
+        id: String,
+        title: Option<String>,
+        description: Option<String>,
+        status: AgentSubagentStatus,
+        error: Option<String>,
+        /// What it was asked to do, last.
+        prompt: Option<String>,
+        /// Its answer.
+        reply: Option<String>,
+        /// Tool calls it made.
+        tools: u32,
+        /// Title of its latest tool call.
+        activity: Option<String>,
+        started_ms: f64,
+        /// When it last stopped working; `None` while it works.
+        ended_ms: Option<f64>,
+        /// Whether it can be stopped on its own.
+        cancellable: bool,
+    },
+    /// A message between sessions in a subagent's conversation: its task (`incoming`) or its report.
+    Message {
+        incoming: bool,
+        text: String,
+    },
+    Permission {
+        id: u32,
+        title: String,
+        options: Vec<AgentPermissionOption>,
+        /// Name of the chosen option, or `None` while pending. Cancelled requests read "Cancelled".
+        chosen: Option<String>,
+    },
+    Error {
+        message: String,
+    },
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentProvider {
+    pub id: String,
+    pub name: String,
+    /// The command line that starts its ACP server.
+    pub command: String,
+    /// Whether the command was found (on `PATH`).
+    pub installed: bool,
+    /// Settings (models, modes…) the agent offered last time it ran; empty before its first session.
+    pub config: Vec<AgentConfigOption>,
+    /// Slash commands it offered last time.
+    pub commands: Vec<AgentCommand>,
+    pub source: AgentSource,
+}
+
+/// Where an agent comes from.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(tag = "kind", rename_all = "camelCase")]
+pub enum AgentSource {
+    Builtin,
+    /// Defined by the user in `<config>/agents/<id>.toml`.
+    Custom,
+    /// Installed from the ACP Registry.
+    Registry {
+        version: String,
+        /// A newer version the registry offers.
+        update: Option<String>,
+    },
+}
+
+/// What an agent says about itself when it starts (`initialize` only: no session, so no
+/// MCP servers, hooks or sign-in run).
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentProbe {
+    pub provider: String,
+    /// The agent's own name and version, when it reports them.
+    pub name: Option<String>,
+    pub version: Option<String>,
+    /// How it is driven: `ACP v1`, `ACP v2` or `native`.
+    pub protocol: String,
+    pub capabilities: AgentCapabilities,
+    /// Ways to sign in it offers.
+    pub auth_methods: Vec<String>,
+    /// Why it could not be started.
+    pub error: Option<String>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct NewAgentTask {
+    /// Validated by the host; defaults to the window project root.
+    #[serde(default)]
+    pub project_root: Option<IpcPath>,
+    pub prompt: AgentPrompt,
+    pub provider: String,
+    /// Settings for the new session (model, mode…).
+    pub config: Vec<AgentConfigChoice>,
+    pub isolation: Isolation,
+    /// Branch to start the worktree from; the current branch when `None`.
+    pub base: Option<String>,
+}
+
+/// A file the task changed, relative to [`AgentTask::base_commit`].
+#[derive(Clone, Debug, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentChange {
+    pub path: IpcPath,
+    pub rel_path: String,
+    pub kind: ide_vcs::ChangeKind,
+    pub added: u32,
+    pub removed: u32,
+}
+
+/// Streamed to the window that subscribed (`AgentManager::subscribe`).
+#[derive(Clone, Debug, Serialize, Type)]
+#[serde(tag = "type", rename_all = "camelCase", rename_all_fields = "camelCase")]
+pub enum AgentEvent {
+    /// A task was created or its metadata changed.
+    Task {
+        task: AgentTask,
+    },
+    Removed {
+        id: String,
+    },
+    /// The task's conversation was cut to its first `length` entries (turns rolled back).
+    Truncated {
+        task: String,
+        length: u32,
+    },
+    /// Entry `index` of `task` (of its subagent `subagent`) was added or replaced.
+    Entry {
+        task: String,
+        subagent: Option<String>,
+        index: u32,
+        entry: AgentEntry,
+    },
+}

crates/ide-agent/src/native/claude/cli.rs

@@ -0,0 +1,158 @@
+//! Starting `claude` in stream-json mode, one process per session.
+
+use ide_core::CancellationToken;
+use std::path::{Path, PathBuf};
+use std::pin::Pin;
+use std::sync::Arc;
+use tokio::io::{AsyncRead, AsyncWrite};
+
+/// The flags every session runs with: the Agent SDK's, as its process transport passes them.
+pub(super) const BASE_ARGS: &[&str] = &[
+    "-p",
+    "--input-format",
+    "stream-json",
+    "--output-format",
+    "stream-json",
+    "--verbose",
+    "--permission-prompt-tool",
+    "stdio",
+    "--include-partial-messages",
+    "--thinking-display",
+    "summarized",
+    "--allow-dangerously-skip-permissions",
+];
+
+/// How a session's process starts.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub(super) enum Start {
+    New {
+        id: String,
+    },
+    Resume {
+        id: String,
+        at: Option<String>,
+    },
+    /// A copy of `from` (up to `at`) under the id `id`.
+    Fork {
+        from: String,
+        id: String,
+        at: Option<String>,
+    },
+}
+
+impl Start {
+    pub fn args(&self) -> Vec<String> {
+        let mut out: Vec<String> = BASE_ARGS.iter().map(|a| (*a).to_owned()).collect();
+        let mut push = |a: &str, v: &str| {
+            out.push(a.to_owned());
+            out.push(v.to_owned());
+        };
+        match self {
+            Start::New { id } => push("--session-id", id),
+            Start::Resume { id, at } => {
+                push("--resume", id);
+                if let Some(at) = at {
+                    push("--resume-session-at", at);
+                }
+            }
+            Start::Fork { from, id, at } => {
+                push("--resume", from);
+                if let Some(at) = at {
+                    push("--resume-session-at", at);
+                }
+                out.push("--fork-session".into());
+                out.push("--session-id".into());
+                out.push(id.clone());
+            }
+        }
+        out
+    }
+}
+
+pub(super) struct Launch {
+    pub program: String,
+    pub args: Vec<String>,
+    pub cwd: PathBuf,
+    pub env: Vec<(String, String)>,
+}
+
+/// A running CLI: its stdio, and a token that kills it when cancelled. Its stdout ending
+/// means it is gone.
+pub(super) struct CliIo {
+    pub stdin: Pin<Box<dyn AsyncWrite + Send>>,
+    pub stdout: Pin<Box<dyn AsyncRead + Send>>,
+    pub kill: CancellationToken,
+}
+
+pub(super) type OnStderr = Arc<dyn Fn(String) + Send + Sync>;
+
+pub(super) trait Cli: Send + Sync + 'static {
+    fn launch(&self, launch: &Launch, on_stderr: OnStderr) -> std::io::Result<CliIo>;
+}
+
+/// The real `claude`.
+pub(super) struct Process;
+
+impl Cli for Process {
+    fn launch(&self, l: &Launch, on_stderr: OnStderr) -> std::io::Result<CliIo> {
+        use std::process::Stdio;
+        let mut cmd = tokio::process::Command::new(&l.program);
+        ide_core::process::prepare(cmd.as_std_mut());
+        cmd.args(&l.args)
+            .current_dir(&l.cwd)
+            .envs(ide_core::process::shell_env())
+            .envs(l.env.iter().map(|(k, v)| (k.as_str(), v.as_str())))
+            // Started from inside Claude Code (a terminal in it), the CLI would think it is nested.
+            .env_remove("CLAUDECODE")
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .kill_on_drop(true);
+        let mut child = cmd.spawn()?;
+        let stdin = child.stdin.take().ok_or_else(|| std::io::Error::other("no stdin"))?;
+        let stdout = child.stdout.take().ok_or_else(|| std::io::Error::other("no stdout"))?;
+        if let Some(stderr) = child.stderr.take() {
+            tokio::spawn(ide_jsonrpc::output::read_lines(stderr, move |line| on_stderr(line)));
+        }
+        let kill = CancellationToken::new();
+        let token = kill.clone();
+        tokio::spawn(async move {
+            tokio::select! {
+                _ = child.wait() => {}
+                _ = token.cancelled() => {
+                    let _ = child.start_kill();
+                    let _ = child.wait().await;
+                }
+            }
+        });
+        Ok(CliIo { stdin: Box::pin(stdin), stdout: Box::pin(stdout), kill })
+    }
+}
+
+/// Claude Code's configuration directory (`CLAUDE_CONFIG_DIR`, else `~/.claude`).
+pub(super) fn config_dir(env: &[(String, String)]) -> Option<PathBuf> {
+    let set = env
+        .iter()
+        .find(|(k, _)| k == "CLAUDE_CONFIG_DIR")
+        .map(|(_, v)| PathBuf::from(v))
+        .or_else(|| std::env::var_os("CLAUDE_CONFIG_DIR").map(PathBuf::from));
+    set.or_else(|| {
+        std::env::var_os("HOME").or_else(|| std::env::var_os("USERPROFILE")).map(|h| Path::new(&h).join(".claude"))
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn session_flags() {
+        let tail = |s: Start| s.args()[BASE_ARGS.len()..].join(" ");
+        assert_eq!(tail(Start::New { id: "a".into() }), "--session-id a");
+        assert_eq!(tail(Start::Resume { id: "a".into(), at: Some("u".into()) }), "--resume a --resume-session-at u");
+        assert_eq!(
+            tail(Start::Fork { from: "a".into(), id: "b".into(), at: None }),
+            "--resume a --fork-session --session-id b"
+        );
+    }
+}

crates/ide-agent/src/native/claude/history.rs

@@ -0,0 +1,226 @@
+//! Claude Code's session transcripts (`<config>/projects/<escaped cwd>/<id>.jsonl`): the
+//! conversation of a session, where to cut it to drop turns, and its title.
+//!
+//! A transcript is a tree: every entry names its parent (`parentUuid`), and resuming at an
+//! earlier entry (`--resume-session-at`) starts a branch there. The conversation is the
+//! path from the newest leaf to the root.
+
+use serde_json::Value;
+use std::collections::{HashMap, HashSet};
+use std::path::{Path, PathBuf};
+
+/// The last group of the uuid of a message sent into a running turn (a steer), so a
+/// transcript tells them from the messages that started turns.
+pub(super) const STEER_MARK: &str = "57ee";
+
+/// The transcript of session `id` started in `cwd`.
+pub(super) fn transcript(config_dir: &Path, cwd: &Path, id: &str) -> PathBuf {
+    let projects = config_dir.join("projects");
+    let direct = projects.join(escape(cwd)).join(format!("{id}.jsonl"));
+    if direct.exists() {
+        return direct;
+    }
+    // Long paths are shortened; the session id is unique anyway.
+    std::fs::read_dir(&projects)
+        .into_iter()
+        .flatten()
+        .flatten()
+        .map(|d| d.path().join(format!("{id}.jsonl")))
+        .find(|p| p.exists())
+        .unwrap_or(direct)
+}
+
+/// The project directory name Claude Code uses for `cwd`.
+pub(super) fn escape(cwd: &Path) -> String {
+    cwd.to_string_lossy().chars().map(|c| if c.is_ascii_alphanumeric() { c } else { '-' }).collect()
+}
+
+pub(super) fn read(path: &Path) -> std::io::Result<Vec<Value>> {
+    let text = std::fs::read_to_string(path)?;
+    Ok(text.lines().filter_map(|l| serde_json::from_str(l).ok()).collect())
+}
+
+fn uuid(e: &Value) -> Option<&str> {
+    e.get("uuid").and_then(Value::as_str)
+}
+
+fn parent(e: &Value) -> Option<&str> {
+    e.get("parentUuid").and_then(Value::as_str)
+}
+
+fn kind(e: &Value) -> &str {
+    e.get("type").and_then(Value::as_str).unwrap_or_default()
+}
+
+fn in_chain(e: &Value) -> bool {
+    uuid(e).is_some()
+        && matches!(kind(e), "user" | "assistant" | "system" | "attachment")
+        && e.get("isSidechain").and_then(Value::as_bool) != Some(true)
+}
+
+/// The conversation: the entries from the root to `upto` (default: the newest leaf), with
+/// tool results that branched off it put back after their calls.
+pub(super) fn chain<'a>(entries: &'a [Value], upto: Option<&str>) -> Vec<&'a Value> {
+    let by_id: HashMap<&str, &Value> =
+        entries.iter().filter(|e| in_chain(e)).filter_map(|e| Some((uuid(e)?, e))).collect();
+    let leaf = match upto {
+        Some(u) => by_id.get(u).copied(),
+        None => {
+            let parents: HashSet<&str> = entries.iter().filter(|e| in_chain(e)).filter_map(parent).collect();
+            entries.iter().rev().filter(|e| in_chain(e)).find(|e| !parents.contains(uuid(e).unwrap_or_default()))
+        }
+    };
+    let mut path = Vec::new();
+    let mut seen = HashSet::new();
+    let mut at = leaf;
+    while let Some(e) = at {
+        if !seen.insert(uuid(e).unwrap_or_default()) {
+            break;
+        }
+        path.push(e);
+        at = parent(e).and_then(|p| by_id.get(p).copied());
+    }
+    path.reverse();
+    // Results of parallel tool calls can hang off another branch of the same message.
+    let answered: HashSet<&str> = path.iter().flat_map(|e| block_ids(e, "tool_result", "tool_use_id")).collect();
+    let mut out = Vec::with_capacity(path.len());
+    for e in path {
+        out.push(e);
+        for call in block_ids(e, "tool_use", "id") {
+            if answered.contains(call) {
+                continue;
+            }
+            if let Some(r) = entries.iter().find(|r| {
+                kind(r) == "user" && in_chain(r) && block_ids(r, "tool_result", "tool_use_id").any(|id| id == call)
+            }) {
+                out.push(r);
+            }
+        }
+    }
+    out
+}
+
+fn block_ids<'a>(e: &'a Value, ty: &'a str, key: &'a str) -> impl Iterator<Item = &'a str> + 'a {
+    e.pointer("/message/content")
+        .and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .filter(move |b| b.get("type").and_then(Value::as_str) == Some(ty))
+        .filter_map(move |b| b.get(key).and_then(Value::as_str))
+}
+
+/// Whether `e` is a message that started a turn: the user's own, not a tool result, a
+/// steer, or text Claude Code added.
+pub(super) fn is_turn_start(e: &Value) -> bool {
+    if kind(e) != "user" || e.get("isMeta").and_then(Value::as_bool) == Some(true) {
+        return false;
+    }
+    if uuid(e).is_some_and(|u| u.ends_with(STEER_MARK)) {
+        return false;
+    }
+    if e.pointer("/origin/kind").and_then(Value::as_str).is_some_and(|k| k != "human") {
+        return false;
+    }
+    match e.pointer("/message/content") {
+        Some(Value::String(s)) => !s.starts_with("<local-command") && !s.starts_with("[Request interrupted"),
+        Some(Value::Array(blocks)) => {
+            !blocks.is_empty()
+                && blocks.iter().all(|b| b.get("type").and_then(Value::as_str) != Some("tool_result"))
+                && !blocks.iter().any(|b| {
+                    b.get("text").and_then(Value::as_str).is_some_and(|t| t.starts_with("[Request interrupted"))
+                })
+        }
+        _ => false,
+    }
+}
+
+/// Where to resume `chain` to drop its last `turns` turns: the entry before the first
+/// dropped turn's message. `Ok(None)`: nothing is left.
+pub(super) fn cut(chain: &[&Value], turns: usize) -> Result<Option<String>, String> {
+    if turns == 0 {
+        return Ok(chain.last().and_then(|e| uuid(e)).map(str::to_owned));
+    }
+    let starts: Vec<&Value> = chain.iter().copied().filter(|e| is_turn_start(e)).collect();
+    if turns > starts.len() {
+        return Err(format!("the session has only {} turns", starts.len()));
+    }
+    let first_dropped = starts[starts.len() - turns];
+    Ok(parent(first_dropped).map(str::to_owned))
+}
+
+/// The newest title Claude Code gave the session.
+pub(super) fn title(entries: &[Value]) -> Option<String> {
+    entries
+        .iter()
+        .rev()
+        .find(|e| kind(e) == "ai-title" || kind(e) == "custom-title")
+        .and_then(|e| e.get("aiTitle").or_else(|| e.get("customTitle")).and_then(Value::as_str))
+        .map(str::to_owned)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn user(id: &str, parent: Option<&str>, text: &str) -> Value {
+        json!({"type": "user", "uuid": id, "parentUuid": parent, "message": {"role": "user", "content": [{"type": "text", "text": text}]}})
+    }
+
+    fn assistant(id: &str, parent: &str, content: Value) -> Value {
+        json!({"type": "assistant", "uuid": id, "parentUuid": parent, "message": {"role": "assistant", "content": content}})
+    }
+
+    #[test]
+    fn the_newest_branch_is_the_conversation() {
+        let entries = vec![
+            json!({"type": "attachment", "uuid": "h", "parentUuid": null}),
+            user("u1", Some("h"), "one"),
+            assistant("a1", "u1", json!([{"type": "text", "text": "ok"}])),
+            user("u2", Some("a1"), "two"),
+            assistant("a2", "u2", json!([{"type": "text", "text": "ok"}])),
+            json!({"type": "ai-title", "aiTitle": "Words"}),
+            // Resumed at a1: a new branch.
+            user("u3", Some("a1"), "three"),
+            assistant("a3", "u3", json!([{"type": "text", "text": "ok"}])),
+        ];
+        let ids = |c: Vec<&Value>| c.iter().map(|e| e["uuid"].as_str().unwrap().to_owned()).collect::<Vec<_>>();
+        assert_eq!(ids(chain(&entries, None)), ["h", "u1", "a1", "u3", "a3"]);
+        assert_eq!(ids(chain(&entries, Some("u2"))), ["h", "u1", "a1", "u2"]);
+        let c = chain(&entries, None);
+        assert_eq!(cut(&c, 1), Ok(Some("a1".into())));
+        assert_eq!(cut(&c, 2), Ok(Some("h".into())));
+        assert!(cut(&c, 3).is_err());
+        assert_eq!(cut(&c, 0), Ok(Some("a3".into())));
+        assert_eq!(title(&entries).as_deref(), Some("Words"));
+    }
+
+    #[test]
+    fn steers_tool_results_and_interruptions_start_no_turn() {
+        let steer = format!("aaaaaaaa-0000-4000-8000-00000000{STEER_MARK}");
+        let entries = vec![
+            user("u1", None, "go"),
+            assistant(
+                "a1",
+                "u1",
+                json!([{"type": "tool_use", "id": "t1", "name": "Bash", "input": {}},
+                {"type": "tool_use", "id": "t2", "name": "Bash", "input": {}}]),
+            ),
+            json!({"type": "user", "uuid": "r1", "parentUuid": "a1", "message": {"content": [{"type": "tool_result", "tool_use_id": "t1"}]}}),
+            // The second result on a branch of its own.
+            json!({"type": "user", "uuid": "r2", "parentUuid": "a1", "message": {"content": [{"type": "tool_result", "tool_use_id": "t2"}]}}),
+            user(&steer, Some("r1"), "also this"),
+            user("i", Some(&steer), "[Request interrupted by user]"),
+        ];
+        let c = chain(&entries, None);
+        let ids: Vec<&str> = c.iter().map(|e| e["uuid"].as_str().unwrap()).collect();
+        assert_eq!(ids, ["u1", "a1", "r2", "r1", steer.as_str(), "i"]);
+        assert_eq!(c.iter().filter(|e| is_turn_start(e)).count(), 1);
+        assert_eq!(cut(&c, 1), Ok(None));
+    }
+
+    #[test]
+    fn project_directory_names() {
+        assert_eq!(escape(Path::new("/private/tmp/a.b/c_d")), "-private-tmp-a-b-c-d");
+    }
+}

crates/ide-agent/src/native/claude/settings.rs

@@ -0,0 +1,234 @@
+//! A session's settings as ACP config options: model, permission mode and effort, from
+//! what Claude Code reports in its `initialize` and `get_settings` responses.
+
+use serde_json::{Value, json};
+
+#[derive(Clone, Debug, Default)]
+pub(super) struct Model {
+    pub value: String,
+    pub name: String,
+    pub description: Option<String>,
+    pub resolved: Option<String>,
+    pub efforts: Vec<String>,
+    pub auto_mode: bool,
+}
+
+#[derive(Clone, Debug, Default)]
+pub(super) struct Settings {
+    pub models: Vec<Model>,
+    /// The model option's value.
+    pub model: String,
+    /// `default`, or an effort level.
+    pub effort: String,
+    pub mode: String,
+    /// ACP `availableCommands`.
+    pub commands: Vec<Value>,
+}
+
+pub(super) const MODEL: &str = "model";
+pub(super) const MODE: &str = "mode";
+pub(super) const EFFORT: &str = "effort";
+
+const MODES: [(&str, &str, &str); 5] = [
+    ("default", "Default", "Ask before edits and commands"),
+    ("acceptEdits", "Accept edits", "Edit files without asking"),
+    ("plan", "Plan", "Plan before making changes"),
+    ("auto", "Auto", "Claude decides what needs asking"),
+    ("bypassPermissions", "Bypass permissions", "Never ask"),
+];
+
+impl Settings {
+    /// From the `initialize` response and `get_settings`' `applied` and `effective`.
+    pub fn from_cli(init: &Value, settings: &Value) -> Self {
+        let models: Vec<Model> = init
+            .get("models")
+            .and_then(Value::as_array)
+            .into_iter()
+            .flatten()
+            .filter_map(|m| {
+                let s = |k: &str| m.get(k).and_then(Value::as_str).map(str::to_owned);
+                let value = s("value")?;
+                Some(Model {
+                    name: s("displayName").unwrap_or_else(|| value.clone()),
+                    description: s("description"),
+                    resolved: s("resolvedModel"),
+                    efforts: if m.get("supportsEffort").and_then(Value::as_bool) == Some(true) {
+                        m.get("supportedEffortLevels")
+                            .and_then(Value::as_array)
+                            .into_iter()
+                            .flatten()
+                            .filter_map(|l| l.as_str().map(str::to_owned))
+                            .collect()
+                    } else {
+                        Vec::new()
+                    },
+                    auto_mode: m.get("supportsAutoMode").and_then(Value::as_bool) == Some(true),
+                    value,
+                })
+            })
+            .collect();
+        let applied = settings.pointer("/applied/model").and_then(Value::as_str);
+        let configured = settings.pointer("/effective/model").and_then(Value::as_str);
+        let mut out = Self {
+            models,
+            model: String::new(),
+            effort: settings.pointer("/applied/effort").and_then(Value::as_str).unwrap_or("default").to_owned(),
+            mode: init.get("current_permission_mode").and_then(Value::as_str).unwrap_or("default").to_owned(),
+            commands: commands(init.get("commands"), &[]),
+        };
+        out.model = out.model_value(configured, applied);
+        out
+    }
+
+    /// The model option's value for the configured alias and the model it runs.
+    fn model_value(&mut self, configured: Option<&str>, applied: Option<&str>) -> String {
+        let runs = |m: &Model| applied.is_none_or(|a| m.value == a || m.resolved.as_deref() == Some(a));
+        // The configured alias, unless the session runs another model (`--model`).
+        if let Some(c) = configured.filter(|c| self.models.iter().any(|m| m.value == *c && runs(m))) {
+            return c.to_owned();
+        }
+        let Some(applied) = applied else { return self.models.first().map(|m| m.value.clone()).unwrap_or_default() };
+        if configured.is_none() && self.models.iter().find(|m| m.value == "default").is_some_and(runs) {
+            return "default".into();
+        }
+        if let Some(m) = self.models.iter().find(|m| runs(m)) {
+            return m.value.clone();
+        }
+        self.models.push(Model { value: applied.to_owned(), name: applied.to_owned(), ..Model::default() });
+        applied.to_owned()
+    }
+
+    fn current_model(&self) -> Option<&Model> {
+        self.models.iter().find(|m| m.value == self.model)
+    }
+
+    /// After a model change: an effort it doesn't offer goes back to the default.
+    pub fn set_model(&mut self, value: &str) {
+        self.model = value.to_owned();
+        let efforts = self.current_model().map(|m| m.efforts.clone()).unwrap_or_default();
+        if self.effort != "default" && !efforts.contains(&self.effort) {
+            self.effort = "default".into();
+        }
+    }
+
+    pub fn modes(&self) -> Vec<&'static str> {
+        let auto = self.current_model().is_some_and(|m| m.auto_mode);
+        MODES.iter().map(|m| m.0).filter(|m| *m != "auto" || auto).collect()
+    }
+
+    pub fn options(&self) -> Value {
+        let mut out = vec![json!({
+            "id": MODE, "name": "Mode", "category": "mode", "type": "select", "currentValue": self.mode,
+            "options": MODES.iter().filter(|m| self.modes().contains(&m.0))
+                .map(|(v, n, d)| json!({ "value": v, "name": n, "description": d })).collect::<Vec<_>>(),
+        })];
+        if !self.models.is_empty() {
+            out.push(json!({
+                "id": MODEL, "name": "Model", "category": "model", "type": "select", "currentValue": self.model,
+                "options": self.models.iter().map(|m| {
+                    let mut o = json!({ "value": m.value, "name": m.name });
+                    if let Some(d) = &m.description { o["description"] = json!(d); }
+                    o
+                }).collect::<Vec<_>>(),
+            }));
+        }
+        let efforts = self.current_model().map(|m| m.efforts.as_slice()).unwrap_or_default();
+        if !efforts.is_empty() {
+            let mut values = vec![json!({ "value": "default", "name": "Default" })];
+            values.extend(efforts.iter().map(|e| json!({ "value": e, "name": capitalize(e) })));
+            let current = if efforts.contains(&self.effort) { self.effort.as_str() } else { "default" };
+            out.push(json!({
+                "id": EFFORT, "name": "Effort", "category": "thought_level", "type": "select",
+                "currentValue": current, "options": values,
+            }));
+        }
+        Value::Array(out)
+    }
+
+    pub fn valid(&self, option: &str, value: &str) -> bool {
+        self.options()
+            .as_array()
+            .into_iter()
+            .flatten()
+            .find(|o| o["id"] == option)
+            .and_then(|o| o["options"].as_array())
+            .is_some_and(|vs| vs.iter().any(|v| v["value"] == value))
+    }
+}
+
+/// Slash commands as ACP `availableCommands`, without those that need Claude Code's terminal.
+pub(super) fn commands(list: Option<&Value>, terminal_only: &[String]) -> Vec<Value> {
+    list.and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .filter_map(|c| {
+            let name = c.get("name")?.as_str()?;
+            if terminal_only.iter().any(|t| t == name) {
+                return None;
+            }
+            let hint = c.get("argumentHint").and_then(Value::as_str).filter(|h| !h.is_empty());
+            Some(json!({
+                "name": name,
+                "description": c.get("description").and_then(Value::as_str).unwrap_or_default(),
+                "input": hint.map(|h| json!({ "hint": h })),
+            }))
+        })
+        .collect()
+}
+
+fn capitalize(s: &str) -> String {
+    let mut c = s.chars();
+    c.next().map(|f| f.to_uppercase().chain(c).collect()).unwrap_or_default()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn init() -> Value {
+        json!({
+            "current_permission_mode": "default",
+            "commands": [{"name": "review", "description": "Review", "argumentHint": "[pr]"}, {"name": "doctor", "description": "", "argumentHint": ""}],
+            "models": [
+                {"value": "default", "resolvedModel": "claude-sonnet-5-5", "displayName": "Default (recommended)",
+                 "supportsEffort": true, "supportedEffortLevels": ["low", "high"], "supportsAutoMode": true},
+                {"value": "opus", "resolvedModel": "claude-opus-5-5", "displayName": "Opus", "supportsEffort": true, "supportedEffortLevels": ["low", "max"]},
+                {"value": "claude-haiku-4-5", "displayName": "Haiku 4.5"}
+            ]
+        })
+    }
+
+    #[test]
+    fn current_model_from_settings() {
+        let s = Settings::from_cli(&init(), &json!({"applied": {"model": "claude-sonnet-5-5", "effort": "high"}}));
+        assert_eq!((s.model.as_str(), s.effort.as_str()), ("default", "high"));
+        let s = Settings::from_cli(
+            &init(),
+            &json!({"effective": {"model": "opus"}, "applied": {"model": "claude-opus-5-5"}}),
+        );
+        assert_eq!(s.model, "opus");
+        assert_eq!(s.modes(), ["default", "acceptEdits", "plan", "bypassPermissions"]);
+        let flag = Settings::from_cli(
+            &init(),
+            &json!({"effective": {"model": "opus"}, "applied": {"model": "claude-sonnet-5-5"}}),
+        );
+        assert_eq!(flag.model, "default", "`--model` wins over the settings file");
+        let s = Settings::from_cli(&init(), &json!({"applied": {"model": "claude-x-1"}}));
+        assert_eq!(s.model, "claude-x-1");
+    }
+
+    #[test]
+    fn options_follow_the_model() {
+        let mut s = Settings::from_cli(&init(), &json!({"applied": {"model": "claude-sonnet-5-5", "effort": "high"}}));
+        let o = s.options();
+        assert_eq!(o[0]["options"].as_array().unwrap().len(), 5);
+        assert_eq!(o[2]["currentValue"], "high");
+        assert!(s.valid("effort", "low") && !s.valid("effort", "max"));
+        s.set_model("opus");
+        assert_eq!(s.effort, "default");
+        s.set_model("claude-haiku-4-5");
+        assert_eq!(s.options().as_array().unwrap().len(), 2, "no effort option without levels");
+        let cmds = commands(init().get("commands"), &["doctor".into()]);
+        assert_eq!(cmds, vec![json!({"name": "review", "description": "Review", "input": {"hint": "[pr]"}})]);
+    }
+}

crates/ide-agent/src/native/claude/tools.rs

@@ -0,0 +1,259 @@
+//! How Claude Code's tools look as ACP tool calls: title, kind, locations and content.
+
+use serde_json::{Value, json};
+use std::path::Path;
+
+/// Tools reported some other way than as a tool call.
+pub(super) fn is_agent(name: &str) -> bool {
+    matches!(name, "Agent" | "Task")
+}
+
+/// Tools whose calls become the session's plan instead of tool calls.
+pub(super) fn is_plan(name: &str) -> bool {
+    matches!(name, "TodoWrite" | "TaskCreate" | "TaskUpdate" | "TaskList" | "TaskGet")
+}
+
+/// The fields of a `tool_call` for a use of tool `name` with `input`.
+pub(super) fn call_fields(name: &str, input: &Value, cwd: &Path) -> Value {
+    let s = |k: &str| input.get(k).and_then(Value::as_str).filter(|v| !v.is_empty());
+    let path = s("file_path").or_else(|| s("notebook_path")).or_else(|| s("path"));
+    let shown = path.map(|p| display_path(p, cwd));
+    let (title, kind) = match name {
+        "Bash" | "PowerShell" => (s("command").map(first_line).unwrap_or_else(|| "Terminal".into()), "execute"),
+        "Read" => {
+            let range = match (input.get("offset").and_then(Value::as_u64), input.get("limit").and_then(Value::as_u64))
+            {
+                (o, Some(l)) if l > 0 => {
+                    let from = o.unwrap_or(1);
+                    format!(" ({from} - {})", from + l - 1)
+                }
+                (Some(o), _) => format!(" (from line {o})"),
+                _ => String::new(),
+            };
+            (format!("Read {}{range}", shown.as_deref().unwrap_or("file")), "read")
+        }
+        "Write" => (shown.map_or_else(|| "Write".into(), |p| format!("Write {p}")), "edit"),
+        "Edit" | "MultiEdit" => (shown.map_or_else(|| "Edit".into(), |p| format!("Edit {p}")), "edit"),
+        "NotebookEdit" => (shown.map_or_else(|| "Edit notebook".into(), |p| format!("Edit {p}")), "edit"),
+        "Glob" => (format!("Find {}", s("pattern").unwrap_or_default()).trim_end().to_owned(), "search"),
+        "Grep" => {
+            let mut t = format!("grep \"{}\"", s("pattern").unwrap_or_default());
+            if let Some(p) = path {
+                t.push(' ');
+                t.push_str(&display_path(p, cwd));
+            }
+            (t, "search")
+        }
+        "WebFetch" => (s("url").map_or_else(|| "Fetch".into(), |u| format!("Fetch {u}")), "fetch"),
+        "WebSearch" => (s("query").map_or_else(|| "Web search".into(), |q| format!("Search \"{q}\"")), "fetch"),
+        "Agent" | "Task" => (s("description").unwrap_or("Subagent").to_owned(), "think"),
+        "ExitPlanMode" => ("Ready to code?".into(), "switch_mode"),
+        "EnterPlanMode" => ("Enter plan mode".into(), "switch_mode"),
+        "Skill" => (s("skill").map_or_else(|| "Load skill".into(), |k| format!("Load skill: {k}")), "other"),
+        _ => (mcp_title(name), "other"),
+    };
+    let mut out = json!({ "title": title, "kind": kind, "rawInput": input });
+    if let Some(p) = path
+        && matches!(kind, "read" | "edit" | "search")
+    {
+        let mut loc = json!({ "path": p });
+        if name == "Read" {
+            loc["line"] = json!(input.get("offset").and_then(Value::as_u64).unwrap_or(1));
+        }
+        out["locations"] = json!([loc]);
+    }
+    let content = input_content(name, input);
+    if !content.is_empty() {
+        out["content"] = Value::Array(content);
+    }
+    out
+}
+
+/// What the input itself shows: an edit's change, a command's purpose, a plan.
+fn input_content(name: &str, input: &Value) -> Vec<Value> {
+    let s = |k: &str| input.get(k).and_then(Value::as_str);
+    match name {
+        "Edit" => match s("file_path") {
+            Some(p) => vec![diff(p, s("old_string"), s("new_string").unwrap_or_default())],
+            None => Vec::new(),
+        },
+        "MultiEdit" => {
+            let Some(p) = s("file_path") else { return Vec::new() };
+            let edits = input.get("edits").and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+            edits
+                .iter()
+                .map(|e| {
+                    let field = |k: &str| e.get(k).and_then(Value::as_str);
+                    diff(p, field("old_string"), field("new_string").unwrap_or_default())
+                })
+                .collect()
+        }
+        "Write" => match (s("file_path"), s("content")) {
+            (Some(p), Some(c)) => vec![diff(p, None, c)],
+            _ => Vec::new(),
+        },
+        "ExitPlanMode" => s("plan").map(|p| vec![text(p)]).unwrap_or_default(),
+        "Bash" | "WebFetch" => s("description").or_else(|| s("prompt")).map(|d| vec![text(d)]).unwrap_or_default(),
+        _ => Vec::new(),
+    }
+}
+
+/// The `tool_call_update` fields that finish a call: status and what it produced.
+/// `structured` is the message's `tool_use_result`.
+pub(super) fn result_fields(name: &str, input: &Value, block: &Value, structured: Option<&Value>) -> Value {
+    let failed = block.get("is_error").and_then(Value::as_bool) == Some(true);
+    let mut content = Vec::new();
+    match name {
+        "Edit" | "MultiEdit" | "Write" if !failed => {
+            // The final change: a write that replaced a file shows what it replaced.
+            content = input_content(name, input);
+            if name == "Write"
+                && let (Some(old), Some(c)) =
+                    (structured.and_then(|s| s.get("originalFile")).and_then(Value::as_str), content.first_mut())
+            {
+                c["oldText"] = json!(old);
+            }
+        }
+        "Bash" | "PowerShell" => {
+            let out = structured
+                .filter(|s| s.get("stdout").is_some())
+                .map(|s| {
+                    let part = |k: &str| s.get(k).and_then(Value::as_str).unwrap_or_default();
+                    [part("stdout"), part("stderr")]
+                        .iter()
+                        .filter(|p| !p.is_empty())
+                        .copied()
+                        .collect::<Vec<_>>()
+                        .join("\n")
+                })
+                .unwrap_or_else(|| result_text(block));
+            if !out.is_empty() {
+                content.push(text(&out));
+            }
+        }
+        _ => {
+            let t = result_text(block);
+            if !t.is_empty() {
+                content.push(text(&t));
+            }
+        }
+    }
+    if failed && content.is_empty() {
+        let t = result_text(block);
+        if !t.is_empty() {
+            content.push(text(&t));
+        }
+    }
+    let mut out = json!({ "status": if failed { "failed" } else { "completed" } });
+    if !content.is_empty() {
+        out["content"] = Value::Array(content);
+    }
+    out
+}
+
+/// The text of a `tool_result` block's content (a string or text blocks).
+pub(super) fn result_text(block: &Value) -> String {
+    match block.get("content") {
+        Some(Value::String(s)) => s.clone(),
+        Some(Value::Array(items)) => {
+            items.iter().filter_map(|b| b.get("text").and_then(Value::as_str)).collect::<Vec<_>>().join("\n")
+        }
+        _ => String::new(),
+    }
+}
+
+/// `TodoWrite` input as ACP plan entries.
+pub(super) fn todo_entries(input: &Value) -> Option<Vec<Value>> {
+    let todos = input.get("todos")?.as_array()?;
+    Some(
+        todos
+            .iter()
+            .map(|t| {
+                let s = |k: &str| t.get(k).and_then(Value::as_str).unwrap_or_default();
+                let status = s("status");
+                let content =
+                    if status == "in_progress" && !s("activeForm").is_empty() { s("activeForm") } else { s("content") };
+                json!({ "content": content, "status": status, "priority": "medium" })
+            })
+            .collect(),
+    )
+}
+
+pub(super) fn text(t: &str) -> Value {
+    json!({ "type": "content", "content": { "type": "text", "text": t } })
+}
+
+fn diff(path: &str, old: Option<&str>, new: &str) -> Value {
+    json!({ "type": "diff", "path": path, "oldText": old, "newText": new })
+}
+
+fn first_line(s: &str) -> String {
+    let line = s.lines().next().unwrap_or_default();
+    if s.contains('\n') { format!("{line} …") } else { line.to_owned() }
+}
+
+/// `mcp__server__tool` as `server: tool`.
+fn mcp_title(name: &str) -> String {
+    match name.strip_prefix("mcp__").and_then(|r| r.split_once("__")) {
+        Some((server, tool)) => format!("{server}: {tool}"),
+        None => name.to_owned(),
+    }
+}
+
+fn display_path(path: &str, cwd: &Path) -> String {
+    Path::new(path)
+        .strip_prefix(cwd)
+        .ok()
+        .filter(|r| !r.as_os_str().is_empty())
+        .map_or_else(|| path.to_owned(), |r| r.to_string_lossy().into_owned())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn titles_kinds_and_changes() {
+        let cwd = Path::new("/w");
+        let edit = call_fields("Edit", &json!({"file_path": "/w/src/a.rs", "old_string": "a", "new_string": "b"}), cwd);
+        assert_eq!(edit["title"], "Edit src/a.rs");
+        assert_eq!(edit["kind"], "edit");
+        assert_eq!(edit["locations"], json!([{"path": "/w/src/a.rs"}]));
+        assert_eq!(edit["content"], json!([{"type": "diff", "path": "/w/src/a.rs", "oldText": "a", "newText": "b"}]));
+        let read = call_fields("Read", &json!({"file_path": "/x/b.rs", "offset": 10, "limit": 5}), cwd);
+        assert_eq!((read["title"].as_str(), read["kind"].as_str()), (Some("Read /x/b.rs (10 - 14)"), Some("read")));
+        assert_eq!(read["locations"], json!([{"path": "/x/b.rs", "line": 10}]));
+        let bash = call_fields("Bash", &json!({"command": "ls\npwd", "description": "List"}), cwd);
+        assert_eq!((bash["title"].as_str(), bash["kind"].as_str()), (Some("ls …"), Some("execute")));
+        assert_eq!(call_fields("Grep", &json!({"pattern": "fn", "path": "/w/src"}), cwd)["title"], "grep \"fn\" src");
+        assert_eq!(call_fields("mcp__docs__read", &json!({}), cwd)["title"], "docs: read");
+        assert_eq!(call_fields("WebSearch", &json!({"query": "q"}), cwd)["kind"], "fetch");
+    }
+
+    #[test]
+    fn results() {
+        let input = json!({"file_path": "/w/n.txt", "content": "two"});
+        let r = result_fields(
+            "Write",
+            &input,
+            &json!({"type": "tool_result", "content": "File created"}),
+            Some(&json!({"type": "update", "originalFile": "one"})),
+        );
+        assert_eq!(
+            r,
+            json!({"status": "completed", "content": [{"type": "diff", "path": "/w/n.txt", "oldText": "one", "newText": "two"}]})
+        );
+        let denied = result_fields("Edit", &json!({}), &json!({"content": "User denied", "is_error": true}), None);
+        assert_eq!(denied, json!({"status": "failed", "content": [text("User denied")]}));
+        let bash = result_fields(
+            "Bash",
+            &json!({}),
+            &json!({"content": "x"}),
+            Some(&json!({"stdout": "out", "stderr": "err"})),
+        );
+        assert_eq!(bash["content"], json!([text("out\nerr")]));
+        let todos =
+            todo_entries(&json!({"todos": [{"content": "A", "activeForm": "Doing A", "status": "in_progress"}]}));
+        assert_eq!(todos.unwrap()[0]["content"], "Doing A");
+    }
+}

crates/ide-agent/src/native/claude/translate.rs

@@ -0,0 +1,581 @@
+//! Claude Code's conversation messages (`assistant`, `user`, `stream_event`, task events)
+//! as ACP `session/update`s, for live sessions and for replayed history alike.
+//!
+//! Subagents (the Agent tool) become ACP subagent sessions whose id is the id of the
+//! Agent tool use that launched them: their messages carry it as `parent_tool_use_id`.
+
+use super::tools;
+use crate::RETRY_UPDATE;
+use serde_json::{Value, json};
+use std::collections::{HashMap, VecDeque};
+use std::path::PathBuf;
+
+/// One `session/update`: the session it belongs to and the update object.
+#[derive(Debug, Clone, PartialEq)]
+pub(super) struct Update {
+    pub session: String,
+    pub update: Value,
+}
+
+struct ToolUse {
+    name: String,
+    input: Value,
+    /// The session the call belongs to.
+    session: String,
+    /// A `tool_call` went out for it.
+    emitted: bool,
+}
+
+struct Child {
+    /// The session that launched it.
+    parent: String,
+    /// What it said last: its answer when it finishes in the background.
+    last_text: String,
+    /// Runs in the background (`task_started`): it reports in a task notification, else
+    /// in its tool result.
+    background: Option<bool>,
+    done: bool,
+}
+
+pub(super) struct Translator {
+    root: String,
+    cwd: PathBuf,
+    /// The client shows subagents as sessions of their own.
+    subagents: bool,
+    /// Text and thinking blocks that streamed, by API message id: (thought, text).
+    streamed: HashMap<String, VecDeque<(bool, String)>>,
+    /// The message streaming now, per session.
+    streaming: HashMap<String, String>,
+    tools: HashMap<String, ToolUse>,
+    /// Subagents by the id of their Agent tool use (their session id).
+    children: HashMap<String, Child>,
+    /// Agent ids (`agent_id`, `task_id`) to the subagent's session id.
+    agent_ids: HashMap<String, String>,
+    /// `TaskCreate` lists: (task id, content, status).
+    tasks: Vec<(String, String, String)>,
+    /// Context use of the main conversation: tokens in its last request, the model, the
+    /// window of each model seen in a `result`.
+    pub used: Option<u64>,
+    pub model: Option<String>,
+    windows: HashMap<String, u64>,
+}
+
+impl Translator {
+    pub fn new(root: &str, cwd: PathBuf, subagents: bool) -> Self {
+        Self {
+            root: root.to_owned(),
+            cwd,
+            subagents,
+            streamed: HashMap::new(),
+            streaming: HashMap::new(),
+            tools: HashMap::new(),
+            children: HashMap::new(),
+            agent_ids: HashMap::new(),
+            tasks: Vec::new(),
+            used: None,
+            model: None,
+            windows: HashMap::new(),
+        }
+    }
+
+    /// The session a message with `parent_tool_use_id` belongs to; `None` when it is a
+    /// subagent's the client doesn't show.
+    fn owner(&self, parent: Option<&str>) -> Option<String> {
+        match parent {
+            None => Some(self.root.clone()),
+            Some(p) if self.children.contains_key(p) => Some(p.to_owned()),
+            Some(_) => None,
+        }
+    }
+
+    /// The session of subagent `agent_id` (a permission request's), else the main one.
+    pub fn session_of_agent(&self, agent_id: Option<&str>) -> String {
+        agent_id.and_then(|a| self.agent_ids.get(a)).cloned().unwrap_or_else(|| self.root.clone())
+    }
+
+    /// The subagent session `session`'s agent id, to stop it.
+    pub fn agent_of(&self, session: &str) -> Option<String> {
+        self.agent_ids.iter().find(|(_, s)| *s == session).map(|(a, _)| a.clone())
+    }
+
+    /// The call `tool_use_id` as a `toolCall` for a permission request.
+    pub fn tool_call(&self, tool_use_id: &str, name: &str, input: &Value) -> Value {
+        let mut call = tools::call_fields(name, input, &self.cwd);
+        call["toolCallId"] = json!(tool_use_id);
+        call
+    }
+
+    /// Whether a `tool_call` went out for `id`.
+    pub fn emitted(&self, id: &str) -> bool {
+        self.tools.get(id).is_some_and(|t| t.emitted)
+    }
+
+    /// Ensures the call `id` is shown before something refers to it (a permission request).
+    pub fn ensure_call(&mut self, id: &str, name: &str, input: &Value, session: &str) -> Vec<Update> {
+        if self.emitted(id) || tools::is_agent(name) && self.subagents {
+            return Vec::new();
+        }
+        let mut call = self.tool_call(id, name, input);
+        call["sessionUpdate"] = json!("tool_call");
+        call["status"] = json!("pending");
+        self.tools.insert(
+            id.to_owned(),
+            ToolUse { name: name.to_owned(), input: input.clone(), session: session.to_owned(), emitted: true },
+        );
+        vec![Update { session: session.to_owned(), update: call }]
+    }
+
+    pub fn on_message(&mut self, msg: &Value) -> Vec<Update> {
+        match msg.get("type").and_then(Value::as_str) {
+            Some("stream_event") => self.on_stream(msg),
+            Some("assistant") => self.on_assistant(msg),
+            Some("user") => self.on_user(msg, false),
+            Some("system") => self.on_system(msg),
+            _ => Vec::new(),
+        }
+    }
+
+    /// A user message of replayed history: the prompts too.
+    pub fn on_history_user(&mut self, msg: &Value) -> Vec<Update> {
+        self.on_user(msg, true)
+    }
+
+    fn on_stream(&mut self, msg: &Value) -> Vec<Update> {
+        let parent = msg.get("parent_tool_use_id").and_then(Value::as_str);
+        let Some(session) = self.owner(parent) else { return Vec::new() };
+        let Some(event) = msg.get("event") else { return Vec::new() };
+        let mut out = Vec::new();
+        match event.get("type").and_then(Value::as_str) {
+            Some("message_start") => {
+                if let Some(id) = event.pointer("/message/id").and_then(Value::as_str) {
+                    self.streaming.insert(session.clone(), id.to_owned());
+                }
+                if parent.is_none() {
+                    self.note_usage(event.pointer("/message/usage"), event.pointer("/message/model"));
+                }
+            }
+            Some("message_delta") if parent.is_none() => {
+                self.note_usage(event.get("usage"), None);
+                out.extend(self.usage_update());
+            }
+            Some("content_block_start") => {
+                let block = event.get("content_block").cloned().unwrap_or_default();
+                match block.get("type").and_then(Value::as_str) {
+                    Some(kind @ ("text" | "thinking")) => {
+                        if let Some(id) = self.streaming.get(&session) {
+                            self.streamed.entry(id.clone()).or_default().push_back((kind == "thinking", String::new()));
+                        }
+                    }
+                    Some("tool_use") => {
+                        // The input streams after this: shown by name until the message has it.
+                        let (id, name) = (str_of(&block, "id"), str_of(&block, "name"));
+                        if !id.is_empty() && !tools::is_plan(&name) && !(tools::is_agent(&name) && self.subagents) {
+                            out.extend(self.ensure_call(&id, &name, &json!({}), &session));
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            Some("content_block_delta") => {
+                let delta = event.get("delta").cloned().unwrap_or_default();
+                let (thought, piece) = match delta.get("type").and_then(Value::as_str) {
+                    Some("text_delta") => (false, str_of(&delta, "text")),
+                    Some("thinking_delta") => (true, str_of(&delta, "thinking")),
+                    _ => return out,
+                };
+                if piece.is_empty() {
+                    return out;
+                }
+                if let Some(id) = self.streaming.get(&session)
+                    && let Some(last) = self.streamed.get_mut(id).and_then(|q| q.back_mut())
+                    && last.0 == thought
+                {
+                    last.1.push_str(&piece);
+                }
+                out.push(chunk(&session, thought, &piece));
+            }
+            _ => {}
+        }
+        out
+    }
+
+    fn on_assistant(&mut self, msg: &Value) -> Vec<Update> {
+        let parent = msg.get("parent_tool_use_id").and_then(Value::as_str);
+        let Some(session) = self.owner(parent) else { return Vec::new() };
+        let message = msg.get("message").cloned().unwrap_or_default();
+        let msg_id = str_of(&message, "id");
+        if parent.is_none() && message.get("model").and_then(Value::as_str) != Some("<synthetic>") {
+            self.note_usage(message.get("usage"), message.get("model"));
+        }
+        let mut out = Vec::new();
+        for block in message.get("content").and_then(Value::as_array).into_iter().flatten() {
+            match block.get("type").and_then(Value::as_str) {
+                Some(kind @ ("text" | "thinking")) => {
+                    let thought = kind == "thinking";
+                    let full = str_of(block, if thought { "thinking" } else { "text" });
+                    if !thought && let Some(child) = self.children.get_mut(&session) {
+                        child.last_text = full.clone();
+                    }
+                    // What streamed already is not sent again.
+                    let streamed = self.streamed.get_mut(&msg_id).and_then(|q| {
+                        let i = q.iter().position(|(t, _)| *t == thought)?;
+                        q.remove(i)
+                    });
+                    let rest = match &streamed {
+                        Some((_, s)) => full.strip_prefix(s.as_str()).unwrap_or_default(),
+                        None => full.as_str(),
+                    };
+                    if !rest.is_empty() {
+                        out.push(chunk(&session, thought, rest));
+                    }
+                }
+                Some("tool_use" | "server_tool_use" | "mcp_tool_use") => out.extend(self.on_tool_use(block, &session)),
+                _ => {}
+            }
+        }
+        if parent.is_none() {
+            out.extend(self.usage_update());
+        }
+        out
+    }
+
+    fn on_tool_use(&mut self, block: &Value, session: &str) -> Vec<Update> {
+        let (id, name) = (str_of(block, "id"), str_of(block, "name"));
+        let input = block.get("input").cloned().unwrap_or_else(|| json!({}));
+        if name == "TodoWrite" {
+            self.tools.insert(id, ToolUse { name, input: input.clone(), session: session.to_owned(), emitted: false });
+            return tools::todo_entries(&input)
+                .map(|entries| vec![Update { session: session.to_owned(), update: plan(entries) }])
+                .unwrap_or_default();
+        }
+        if tools::is_agent(&name) && self.subagents {
+            let fresh = !self.children.contains_key(&id);
+            self.tools.insert(
+                id.clone(),
+                ToolUse { name, input: input.clone(), session: session.to_owned(), emitted: false },
+            );
+            if !fresh {
+                return Vec::new();
+            }
+            self.children.insert(
+                id.clone(),
+                Child { parent: session.to_owned(), last_text: String::new(), background: None, done: false },
+            );
+            let s = |k: &str| input.get(k).and_then(Value::as_str);
+            let mut announce = json!({
+                "sessionUpdate": "subagent_update", "sessionId": id,
+                "title": s("subagent_type").unwrap_or("Agent"),
+                "capabilities": { "cancel": {} }, "state": { "state": "running" },
+            });
+            if let Some(d) = s("description") {
+                announce["description"] = json!(d);
+            }
+            let mut out = vec![Update { session: session.to_owned(), update: announce }];
+            if let Some(prompt) = s("prompt") {
+                let message = json!({
+                    "sessionUpdate": "session_message", "messageId": id,
+                    "senderSessionId": session, "recipientSessionId": id,
+                    "content": [{ "type": "text", "text": prompt }],
+                });
+                out.push(Update { session: session.to_owned(), update: message.clone() });
+                out.push(Update { session: id, update: message });
+            }
+            return out;
+        }
+        if tools::is_plan(&name) {
+            self.tools.insert(id, ToolUse { name, input, session: session.to_owned(), emitted: false });
+            return Vec::new();
+        }
+        let was_emitted = self.emitted(&id);
+        let mut fields = self.tool_call(&id, &name, &input);
+        self.tools.insert(id, ToolUse { name, input, session: session.to_owned(), emitted: true });
+        fields["sessionUpdate"] = json!(if was_emitted { "tool_call_update" } else { "tool_call" });
+        if !was_emitted {
+            fields["status"] = json!("pending");
+        }
+        vec![Update { session: session.to_owned(), update: fields }]
+    }
+
+    fn on_user(&mut self, msg: &Value, history: bool) -> Vec<Update> {
+        let parent = msg.get("parent_tool_use_id").and_then(Value::as_str);
+        let Some(session) = self.owner(parent) else { return Vec::new() };
+        let structured = msg.get("tool_use_result").or_else(|| msg.get("toolUseResult"));
+        let content = msg.pointer("/message/content");
+        let mut out = Vec::new();
+        if let Some(text) = content.and_then(Value::as_str) {
+            if history && parent.is_none() {
+                out.push(Update {
+                    session,
+                    update: json!({ "sessionUpdate": "user_message_chunk", "content": { "type": "text", "text": text } }),
+                });
+            }
+            return out;
+        }
+        let blocks = content.and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+        let results = blocks.iter().filter(|b| b.get("type").and_then(Value::as_str) == Some("tool_result")).count();
+        for block in blocks {
+            match block.get("type").and_then(Value::as_str) {
+                Some("tool_result") => {
+                    // `tool_use_result` describes the message's only result.
+                    let structured = structured.filter(|_| results == 1);
+                    out.extend(self.on_tool_result(block, structured));
+                }
+                Some("text") if history && parent.is_none() => out.push(Update {
+                    session: session.clone(),
+                    update: json!({ "sessionUpdate": "user_message_chunk", "content": { "type": "text", "text": str_of(block, "text") } }),
+                }),
+                Some("image") if history && parent.is_none() => {
+                    let source = block.get("source").cloned().unwrap_or_default();
+                    out.push(Update {
+                        session: session.clone(),
+                        update: json!({ "sessionUpdate": "user_message_chunk", "content": {
+                            "type": "image", "data": str_of(&source, "data"), "mimeType": str_of(&source, "media_type") } }),
+                    });
+                }
+                _ => {}
+            }
+        }
+        out
+    }
+
+    fn on_tool_result(&mut self, block: &Value, structured: Option<&Value>) -> Vec<Update> {
+        let id = str_of(block, "tool_use_id");
+        let Some(tool) = self.tools.get(&id) else { return Vec::new() };
+        let (name, input, session, emitted) =
+            (tool.name.clone(), tool.input.clone(), tool.session.clone(), tool.emitted);
+        let failed = block.get("is_error").and_then(Value::as_bool) == Some(true);
+        if tools::is_agent(&name) && self.children.contains_key(&id) {
+            // A background launch reports its result later, in a task notification.
+            let launched = structured.and_then(|s| s.get("status")).and_then(Value::as_str) == Some("async_launched")
+                || structured.and_then(|s| s.get("isAsync")).and_then(Value::as_bool) == Some(true);
+            if launched && !failed {
+                return Vec::new();
+            }
+            // Its report, without what the harness adds for the model.
+            let report = structured
+                .filter(|s| s.get("status").and_then(Value::as_str) == Some("completed"))
+                .and_then(|s| s.get("content")?.as_array().cloned())
+                .map(|blocks| {
+                    blocks
+                        .iter()
+                        .filter_map(|b| b.get("text").and_then(Value::as_str))
+                        .filter(|t| !t.trim_start().starts_with("<tools-used"))
+                        .collect::<Vec<_>>()
+                        .join("\n")
+                })
+                .unwrap_or_else(|| tools::result_text(block));
+            let state = if failed { "error" } else { "end_turn" };
+            return self.finish_child(&id, state, Some(report));
+        }
+        if tools::is_plan(&name) {
+            if !failed && let Some(entries) = self.task_plan(&name, &input, block, structured) {
+                return vec![Update { session, update: plan(entries) }];
+            }
+            return Vec::new();
+        }
+        if !emitted {
+            return Vec::new();
+        }
+        let mut update = tools::result_fields(&name, &input, block, structured);
+        update["sessionUpdate"] = json!("tool_call_update");
+        update["toolCallId"] = json!(id);
+        vec![Update { session, update }]
+    }
+
+    /// Ends subagent `id` (`stop` an ACP stop reason, or `error`) with its answer.
+    fn finish_child(&mut self, id: &str, stop: &str, reply: Option<String>) -> Vec<Update> {
+        let Some(child) = self.children.get_mut(id) else { return Vec::new() };
+        if child.done {
+            return Vec::new();
+        }
+        child.done = true;
+        let parent = child.parent.clone();
+        let reply = reply.filter(|r| !r.trim().is_empty()).unwrap_or_else(|| child.last_text.clone());
+        let mut state = json!({ "state": "idle", "stopReason": stop });
+        if stop == "error" {
+            state["error"] = json!({ "code": -32603, "message": if reply.is_empty() { "The subagent failed." } else { reply.as_str() } });
+        }
+        let mut out = vec![Update {
+            session: parent.clone(),
+            update: json!({ "sessionUpdate": "subagent_update", "sessionId": id, "state": state }),
+        }];
+        if !reply.is_empty() && stop != "error" {
+            out.push(Update {
+                session: parent.clone(),
+                update: json!({
+                    "sessionUpdate": "session_message", "messageId": format!("{id}:reply"),
+                    "senderSessionId": id, "recipientSessionId": parent,
+                    "content": [{ "type": "text", "text": reply }],
+                }),
+            });
+        }
+        out
+    }
+
+    fn on_system(&mut self, msg: &Value) -> Vec<Update> {
+        let tool_use = str_of(msg, "tool_use_id");
+        match msg.get("subtype").and_then(Value::as_str) {
+            Some("task_started") => {
+                if let Some(task) = msg.get("task_id").and_then(Value::as_str)
+                    && let Some(child) = self.children.get_mut(&tool_use)
+                {
+                    child.background = msg.get("is_backgrounded").and_then(Value::as_bool);
+                    self.agent_ids.insert(task.to_owned(), tool_use);
+                } else if let Some(t) = self.tools.get(&tool_use).filter(|t| t.emitted) {
+                    let update =
+                        json!({ "sessionUpdate": "tool_call_update", "toolCallId": tool_use, "status": "in_progress" });
+                    return vec![Update { session: t.session.clone(), update }];
+                }
+                Vec::new()
+            }
+            // Claude Code retries a failed API request on its own; without this the turn looks stuck.
+            Some("api_retry") => {
+                let n = |k: &str| msg.get(k).and_then(Value::as_u64);
+                let error = msg.get("error").and_then(|e| {
+                    e.as_str().map(str::to_owned).or_else(|| e.get("message")?.as_str().map(str::to_owned))
+                });
+                vec![Update {
+                    session: self.root.clone(),
+                    update: json!({
+                        "sessionUpdate": RETRY_UPDATE,
+                        "attempt": n("attempt").unwrap_or(1),
+                        "maxRetries": n("max_retries"),
+                        "retryDelayMs": n("retry_delay_ms").unwrap_or(0),
+                        "error": error,
+                    }),
+                }]
+            }
+            Some("task_notification") if self.children.get(&tool_use).is_some_and(|c| c.background != Some(false)) => {
+                let stop = match msg.get("status").and_then(Value::as_str) {
+                    Some("failed") => "error",
+                    Some("killed" | "stopped" | "cancelled") => "cancelled",
+                    _ => "end_turn",
+                };
+                let summary = msg.get("summary").and_then(Value::as_str).map(str::to_owned);
+                let last = self.children.get(&tool_use).map(|c| c.last_text.clone()).filter(|t| !t.is_empty());
+                self.finish_child(&tool_use, stop, last.or(summary))
+            }
+            _ => Vec::new(),
+        }
+    }
+
+    /// Marks subagent `session` waiting for (or no longer waiting for) the user.
+    pub fn child_state(&self, session: &str, waiting: bool) -> Option<Update> {
+        let child = self.children.get(session).filter(|c| !c.done)?;
+        let state = if waiting { "requires_action" } else { "running" };
+        Some(Update {
+            session: child.parent.clone(),
+            update: json!({ "sessionUpdate": "subagent_update", "sessionId": session, "state": { "state": state } }),
+        })
+    }
+
+    /// Subagents still working when their agent is gone.
+    pub fn stop_children(&mut self) -> Vec<Update> {
+        let ids: Vec<String> = self.children.iter().filter(|(_, c)| !c.done).map(|(id, _)| id.clone()).collect();
+        ids.iter().flat_map(|id| self.finish_child(id, "cancelled", None)).collect()
+    }
+
+    fn task_plan(
+        &mut self,
+        name: &str,
+        input: &Value,
+        block: &Value,
+        structured: Option<&Value>,
+    ) -> Option<Vec<Value>> {
+        let s = |v: &Value, k: &str| v.get(k).and_then(Value::as_str).map(str::to_owned);
+        match name {
+            "TaskCreate" => {
+                let id =
+                    structured.and_then(|r| r.pointer("/task/id")).and_then(Value::as_str).map(str::to_owned).or_else(
+                        || {
+                            let text = tools::result_text(block);
+                            let rest = text.trim().strip_prefix("Task #")?;
+                            Some(rest.split_whitespace().next()?.to_owned())
+                        },
+                    )?;
+                self.tasks.push((id, s(input, "subject").unwrap_or_default(), "pending".into()));
+            }
+            "TaskUpdate" => {
+                let id = s(input, "taskId")?;
+                if s(input, "status").as_deref() == Some("deleted") {
+                    self.tasks.retain(|t| t.0 != id);
+                } else {
+                    let t = self.tasks.iter_mut().find(|t| t.0 == id)?;
+                    if let Some(st) = s(input, "status") {
+                        t.2 = st;
+                    }
+                    if let Some(sub) = s(input, "subject") {
+                        t.1 = sub;
+                    }
+                }
+            }
+            "TaskList" => {
+                let list = structured?.get("tasks")?.as_array()?;
+                self.tasks = list
+                    .iter()
+                    .filter_map(|t| {
+                        Some((s(t, "id")?, s(t, "subject")?, s(t, "status").unwrap_or_else(|| "pending".into())))
+                    })
+                    .collect();
+            }
+            _ => return None,
+        }
+        Some(self.tasks.iter().map(|(_, c, st)| json!({ "content": c, "status": st, "priority": "medium" })).collect())
+    }
+
+    fn note_usage(&mut self, usage: Option<&Value>, model: Option<&Value>) {
+        if let Some(m) = model.and_then(Value::as_str).filter(|m| *m != "<synthetic>") {
+            self.model = Some(m.to_owned());
+        }
+        let Some(u) = usage else { return };
+        let n = |k: &str| u.get(k).and_then(Value::as_u64).unwrap_or(0);
+        let total =
+            n("input_tokens") + n("output_tokens") + n("cache_read_input_tokens") + n("cache_creation_input_tokens");
+        if total > 0 {
+            self.used = Some(total);
+        }
+    }
+
+    /// Learns the context window of the models a `result` reports; returns the usage then.
+    pub fn on_result(&mut self, result: &Value) -> Vec<Update> {
+        for (model, u) in result.get("modelUsage").and_then(Value::as_object).into_iter().flatten() {
+            if let Some(w) = u.get("contextWindow").and_then(Value::as_u64).filter(|w| *w > 0) {
+                self.windows.insert(model.clone(), w);
+            }
+        }
+        self.usage_update().into_iter().collect()
+    }
+
+    fn usage_update(&self) -> Option<Update> {
+        let used = self.used?;
+        let size = self
+            .model
+            .as_ref()
+            .and_then(|m| {
+                self.windows
+                    .get(m)
+                    .or_else(|| self.windows.iter().find(|(k, _)| k.starts_with(m.as_str())).map(|(_, v)| v))
+            })
+            .or_else(|| (self.windows.len() == 1).then(|| self.windows.values().next()).flatten())?;
+        Some(Update {
+            session: self.root.clone(),
+            update: json!({ "sessionUpdate": "usage_update", "used": used, "size": size }),
+        })
+    }
+}
+
+fn chunk(session: &str, thought: bool, text: &str) -> Update {
+    let kind = if thought { "agent_thought_chunk" } else { "agent_message_chunk" };
+    Update {
+        session: session.to_owned(),
+        update: json!({ "sessionUpdate": kind, "content": { "type": "text", "text": text } }),
+    }
+}
+
+fn plan(entries: Vec<Value>) -> Value {
+    json!({ "sessionUpdate": "plan", "entries": entries })
+}
+
+fn str_of(v: &Value, key: &str) -> String {
+    v.get(key).and_then(Value::as_str).unwrap_or_default().to_owned()
+}

crates/ide-agent/src/native/codex/mod.rs

@@ -0,0 +1,994 @@
+//! Codex over `codex app-server`: JSON-RPC (v2 threads and turns) on the child's stdio,
+//! translated to and from ACP. A codex thread is an ACP session; a subagent's thread is
+//! a subagent session of the thread that spawned it.
+
+mod translate;
+
+#[cfg(test)]
+mod tests;
+
+use super::Shim;
+use crate::provider::ProviderSpec;
+use ide_jsonrpc::{Framing, Handler, Peer, RpcError, codes};
+use parking_lot::Mutex;
+use serde_json::{Value, json};
+use std::collections::{HashMap, HashSet};
+use std::path::Path;
+use std::sync::{Arc, OnceLock, Weak};
+use std::time::{Duration, Instant};
+use tokio::sync::oneshot;
+use translate::{Choice, Failure, ModelInfo, Settings};
+
+/// Notifications codex need not send: the client builds diffs from the items.
+const OPT_OUT: [&str; 1] = ["turn/diff/updated"];
+/// A running command's output is sent at most this often.
+const OUTPUT_EVERY: Duration = Duration::from_millis(200);
+/// How long a `session/cancel` with no turn running still stops the prompt that follows.
+const EARLY_CANCEL: Duration = Duration::from_secs(1);
+/// How long the client's connection outlives codex.
+const EXIT_GRACE: Duration = Duration::from_millis(100);
+/// ACP's error code for a request that needs the user to sign in.
+const AUTH_REQUIRED: i64 = -32000;
+
+pub(crate) fn connect(
+    spec: &ProviderSpec,
+    cwd: &Path,
+    client: Arc<dyn Handler>,
+    on_stderr: Box<dyn Fn(String) + Send + Sync>,
+) -> std::io::Result<Peer> {
+    attach(client, |events| {
+        let command = super::newest_install(&spec.command);
+        Peer::spawn_framed(&command, &spec.args, cwd, &spec.env, events, on_stderr, Framing::Lines)
+    })
+}
+
+/// Connects `client` to a shim driving the codex connection `connect_codex` opens (it
+/// gets the handler for what codex sends). Each side's end closes the other.
+fn attach(
+    client: Arc<dyn Handler>,
+    connect_codex: impl FnOnce(Arc<dyn Handler>) -> std::io::Result<Peer>,
+) -> std::io::Result<Peer> {
+    let shim = Arc::new(CodexShim {
+        runtime: tokio::runtime::Handle::current(),
+        codex: OnceLock::new(),
+        client: OnceLock::new(),
+        state: Mutex::new(State::default()),
+        models: tokio::sync::Mutex::new(None),
+    });
+    let codex = connect_codex(Arc::new(CodexEvents(Arc::downgrade(&shim))))?;
+    let _ = shim.codex.set(codex.clone());
+    let ours = super::serve(shim.clone(), client);
+    let to_client = shim.client.get().cloned().expect("serve attaches the client");
+    {
+        let (shim, codex, to_client) = (shim.clone(), codex.clone(), to_client.clone());
+        tokio::spawn(async move {
+            codex.closed().await;
+            shim.codex_gone();
+            // Answers already on their way (the turn that just ended) go out first.
+            tokio::time::sleep(EXIT_GRACE).await;
+            to_client.kill();
+        });
+    }
+    tokio::spawn(async move {
+        to_client.closed().await;
+        codex.kill();
+    });
+    Ok(ours)
+}
+
+struct CodexShim {
+    runtime: tokio::runtime::Handle,
+    codex: OnceLock<Peer>,
+    client: OnceLock<Peer>,
+    state: Mutex<State>,
+    /// `model/list`, fetched once.
+    models: tokio::sync::Mutex<Option<Arc<Vec<ModelInfo>>>>,
+}
+
+#[derive(Default)]
+struct State {
+    initialized: bool,
+    /// By codex thread id, which is also the ACP session id.
+    threads: HashMap<String, Thread>,
+    /// The last `account/rateLimits/updated` snapshot.
+    rate_limits: Option<Value>,
+    /// Codex exited.
+    gone: bool,
+}
+
+#[derive(Default)]
+struct Thread {
+    /// The session whose agent spawned this one (a subagent's thread).
+    parent: Option<String>,
+    /// What turns run with (sessions of their own only).
+    settings: Option<Settings>,
+    cwd: Option<String>,
+    /// The turn running now.
+    turn: Option<String>,
+    /// The last turn that completed.
+    completed: Option<String>,
+    /// The `session/prompt` waiting for its turn to end.
+    prompt: Option<PendingPrompt>,
+    /// The current turn's tool items, for approval titles.
+    items: HashMap<String, Value>,
+    /// Output of running commands, by item id.
+    outputs: HashMap<String, Output>,
+    /// Items whose text was streamed (their completion doesn't repeat it).
+    streamed: HashSet<String>,
+    /// Kind and item of the text chunk sent last, while nothing else followed it.
+    last_chunk: Option<(&'static str, String)>,
+    /// The last error reported for the running turn.
+    error: Option<Value>,
+    /// A `session/cancel` that came with no turn running: it can overtake the
+    /// `session/prompt` sent just before it.
+    early_cancel: Option<Instant>,
+    /// The latest agent message (a subagent's answer).
+    answer: String,
+}
+
+struct PendingPrompt {
+    done: oneshot::Sender<(Value, Option<Value>)>,
+    /// Known once `turn/start` answers or `turn/started` arrives.
+    turn: Option<String>,
+    /// Cancelled before the turn was known: interrupt it as soon as it is.
+    cancel: bool,
+}
+
+struct Output {
+    text: String,
+    sent: Instant,
+}
+
+/// Receives what codex sends.
+struct CodexEvents(Weak<CodexShim>);
+
+impl Handler for CodexEvents {
+    fn on_notification(&self, method: &str, params: Value) {
+        if let Some(shim) = self.0.upgrade() {
+            shim.on_codex_notification(method, &params);
+        }
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        let shim = self.0.upgrade().ok_or((codes::INTERNAL_ERROR, "closed".to_owned()))?;
+        shim.on_codex_request(method, &params)
+    }
+}
+
+impl Shim for CodexShim {
+    fn attach(&self, client: Peer) {
+        let _ = self.client.set(client);
+    }
+}
+
+impl Handler for CodexShim {
+    fn on_notification(&self, method: &str, params: Value) {
+        if method == "session/cancel"
+            && let Some(session) = params.get("sessionId").and_then(Value::as_str)
+        {
+            self.cancel(session);
+        }
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        self.on_request_with_data(method, params).map_err(|(code, message, _)| (code, message))
+    }
+
+    fn on_request_with_data(&self, method: &str, params: Value) -> Result<Value, (i64, String, Option<Value>)> {
+        self.runtime.block_on(self.handle(method, params)).map_err(|e| (e.code, e.message, e.data))
+    }
+}
+
+/// The `error` of an ACP response.
+#[derive(Debug)]
+struct ResponseError {
+    code: i64,
+    message: String,
+    data: Option<Value>,
+}
+
+fn error(code: i64, message: impl Into<String>) -> ResponseError {
+    ResponseError { code, message: message.into(), data: None }
+}
+
+fn invalid(message: impl Into<String>) -> ResponseError {
+    error(codes::INVALID_PARAMS, message)
+}
+
+/// A failed codex request, for the ACP client.
+fn from_codex(e: RpcError) -> ResponseError {
+    match e {
+        RpcError::Server { code, message, data } => {
+            // Protocol errors can list method names containing "auth"; they are not sign-in failures.
+            let protocol = matches!(
+                code,
+                codes::PARSE_ERROR | codes::INVALID_REQUEST | codes::METHOD_NOT_FOUND | codes::INVALID_PARAMS
+            );
+            let code = if !protocol && message.to_lowercase().contains("auth") { AUTH_REQUIRED } else { code };
+            ResponseError { code, message, data }
+        }
+        RpcError::Closed => error(codes::INTERNAL_ERROR, "Codex exited"),
+        e => error(codes::INTERNAL_ERROR, e.to_string()),
+    }
+}
+
+fn str_param<'a>(params: &'a Value, key: &str) -> Result<&'a str, ResponseError> {
+    params.get(key).and_then(Value::as_str).ok_or_else(|| invalid(format!("missing {key}")))
+}
+
+impl CodexShim {
+    fn codex(&self) -> &Peer {
+        self.codex.get().expect("attached before any message")
+    }
+
+    async fn call(&self, method: &str, params: Value) -> Result<Value, ResponseError> {
+        self.codex().request(method, params, None).await.map_err(from_codex)
+    }
+
+    async fn handle(&self, method: &str, params: Value) -> Result<Value, ResponseError> {
+        match method {
+            "initialize" => self.initialize().await,
+            "session/new" => self.new_session(&params).await,
+            "session/load" => self.load_session(&params).await,
+            "session/fork" => self.fork_session(&params).await,
+            "session/set_config_option" => self.set_config(&params).await,
+            "session/prompt" => self.prompt(&params).await,
+            "_openidea/steer" => self.steer(&params).await,
+            "_openidea/rollback" => self.rollback(&params).await,
+            "session/close" => self.close(&params).await,
+            _ => Err(error(codes::METHOD_NOT_FOUND, format!("unsupported method {method}"))),
+        }
+    }
+
+    async fn initialize(&self) -> Result<Value, ResponseError> {
+        let info = self
+            .call(
+                "initialize",
+                json!({
+                    "clientInfo": { "name": "openidea", "title": "OpenIDEA", "version": env!("CARGO_PKG_VERSION") },
+                    "capabilities": { "experimentalApi": true, "optOutNotificationMethods": OPT_OUT },
+                }),
+            )
+            .await?;
+        self.codex().notify("initialized", Value::Null).map_err(from_codex)?;
+        self.state.lock().initialized = true;
+        // `<client>/<codex version> (<platform>) …`
+        let version = info
+            .get("userAgent")
+            .and_then(Value::as_str)
+            .and_then(|ua| ua.split_whitespace().next())
+            .and_then(|first| first.split_once('/'))
+            .map(|(_, v)| v.to_owned());
+        Ok(json!({
+            "protocolVersion": 1,
+            "agentCapabilities": {
+                "loadSession": true,
+                "promptCapabilities": { "image": true, "audio": false, "embeddedContext": true },
+                "mcpCapabilities": { "http": false, "sse": false },
+                "sessionCapabilities": { "fork": {}, "close": {} },
+                "_meta": { "openidea": { "rollback": true, "steer": true } },
+            },
+            "agentInfo": { "name": "codex", "title": "Codex", "version": version },
+            "authMethods": [],
+        }))
+    }
+
+    /// The models codex offers; empty when it can't list them.
+    async fn models(&self) -> Arc<Vec<ModelInfo>> {
+        let mut cached = self.models.lock().await;
+        if let Some(m) = cached.as_ref() {
+            return m.clone();
+        }
+        let mut all = Vec::new();
+        let mut cursor = Value::Null;
+        loop {
+            match self.call("model/list", json!({ "cursor": cursor })).await {
+                Ok(page) => {
+                    all.extend(translate::models_of(&page));
+                    match page.get("nextCursor").filter(|c| c.is_string()) {
+                        Some(next) if *next != cursor => cursor = next.clone(),
+                        _ => break,
+                    }
+                }
+                Err(e) => {
+                    tracing::warn!("codex: listing models failed: {}", e.message);
+                    return Arc::new(all);
+                }
+            }
+        }
+        let models = Arc::new(all);
+        *cached = Some(models.clone());
+        models
+    }
+
+    /// Registers a thread codex opened for a session of its own; returns its `configOptions`.
+    fn open_thread(&self, result: &Value, models: &[ModelInfo], settings: Option<Settings>) -> (String, Value) {
+        let thread = result.get("thread").unwrap_or(&Value::Null);
+        let id = thread.get("id").and_then(Value::as_str).unwrap_or_default().to_owned();
+        let settings = settings.unwrap_or_else(|| Settings::of(result, models));
+        let options = translate::config_options(models, &settings);
+        let cwd = result.get("cwd").or(thread.get("cwd")).and_then(Value::as_str).map(str::to_owned);
+        let mut state = self.state.lock();
+        let t = state.threads.entry(id.clone()).or_default();
+        t.parent = None;
+        t.settings = Some(settings);
+        t.cwd = cwd;
+        (id, options)
+    }
+
+    async fn new_session(&self, params: &Value) -> Result<Value, ResponseError> {
+        let models = self.models().await;
+        let result = self.call("thread/start", json!({ "cwd": params.get("cwd") })).await?;
+        let (id, options) = self.open_thread(&result, &models, None);
+        if id.is_empty() {
+            return Err(error(codes::INTERNAL_ERROR, "codex started no thread"));
+        }
+        Ok(json!({ "sessionId": id, "configOptions": options }))
+    }
+
+    /// Resumes the thread and replays its history before answering.
+    async fn load_session(&self, params: &Value) -> Result<Value, ResponseError> {
+        let id = str_param(params, "sessionId")?;
+        let models = self.models().await;
+        let result = self.call("thread/resume", json!({ "threadId": id, "cwd": params.get("cwd") })).await?;
+        let (_, options) = self.open_thread(&result, &models, None);
+        let cwd = self.state.lock().threads.get(id).and_then(|t| t.cwd.clone());
+        let thread = result.get("thread").unwrap_or(&Value::Null);
+        for update in translate::history(thread, cwd.as_deref()) {
+            self.emit(id, update);
+        }
+        Ok(json!({ "configOptions": options }))
+    }
+
+    async fn fork_session(&self, params: &Value) -> Result<Value, ResponseError> {
+        let source = str_param(params, "sessionId")?;
+        let models = self.models().await;
+        let settings = self.state.lock().threads.get(source).and_then(|t| t.settings.clone());
+        let mut request = json!({ "threadId": source, "cwd": params.get("cwd") });
+        if let Some(s) = &settings {
+            request["model"] = json!(s.model_slug(&models));
+            request["approvalPolicy"] = json!(s.mode.approval_policy());
+            request["sandbox"] = json!(s.mode.sandbox_mode());
+        }
+        let result = self.call("thread/fork", request).await?;
+        let (id, options) = self.open_thread(&result, &models, settings);
+        Ok(json!({ "sessionId": id, "configOptions": options }))
+    }
+
+    async fn set_config(&self, params: &Value) -> Result<Value, ResponseError> {
+        let session = str_param(params, "sessionId")?;
+        let option = str_param(params, "configId")?;
+        let value = str_param(params, "value")?;
+        let models = self.models().await;
+        let mut state = self.state.lock();
+        let settings = state
+            .threads
+            .get_mut(session)
+            .and_then(|t| t.settings.as_mut())
+            .ok_or_else(|| invalid(format!("no session {session}")))?;
+        settings.set(&models, option, value).map_err(invalid)?;
+        Ok(json!({ "configOptions": translate::config_options(&models, settings) }))
+    }
+
+    async fn prompt(&self, params: &Value) -> Result<Value, ResponseError> {
+        let session = str_param(params, "sessionId")?.to_owned();
+        let input = translate::user_input(params.get("prompt").unwrap_or(&Value::Null));
+        if input.is_empty() {
+            return Err(invalid("empty prompt"));
+        }
+        let models = self.models().await;
+        let (done, ended) = oneshot::channel();
+        let settings = {
+            let mut state = self.state.lock();
+            if state.gone {
+                return Err(error(codes::INTERNAL_ERROR, "Codex exited"));
+            }
+            let t = state.threads.get_mut(&session).ok_or_else(|| invalid(format!("no session {session}")))?;
+            if t.prompt.is_some() {
+                return Err(invalid("a turn is already running"));
+            }
+            let cancel = t.early_cancel.take().is_some_and(|at| at.elapsed() < EARLY_CANCEL);
+            t.prompt = Some(PendingPrompt { done, turn: None, cancel });
+            t.error = None;
+            t.settings.clone()
+        };
+        let mut request = json!({ "threadId": session, "input": input, "summary": "auto" });
+        if let Some(s) = settings {
+            request["model"] = json!(s.model_slug(&models));
+            request["approvalPolicy"] = json!(s.mode.approval_policy());
+            request["sandboxPolicy"] = s.mode.sandbox_policy();
+            if let Some(effort) = &s.effort {
+                request["effort"] = json!(effort);
+            }
+        }
+        match self.call("turn/start", request).await {
+            Ok(started) => {
+                if let Some(turn) = started.pointer("/turn/id").and_then(Value::as_str) {
+                    self.turn_known(&session, turn, false);
+                }
+            }
+            Err(e) => {
+                if let Some(t) = self.state.lock().threads.get_mut(&session) {
+                    t.prompt = None;
+                }
+                return Err(e);
+            }
+        }
+        let (turn, last_error) = ended.await.map_err(|_| error(codes::INTERNAL_ERROR, "Codex exited"))?;
+        let rate_limits = self.state.lock().rate_limits.clone();
+        stop_reason(&turn, last_error, rate_limits.as_ref())
+    }
+
+    async fn steer(&self, params: &Value) -> Result<Value, ResponseError> {
+        let session = str_param(params, "sessionId")?;
+        let turn = self.state.lock().threads.get(session).and_then(|t| t.turn.clone());
+        let turn = turn.ok_or_else(|| invalid("no turn is running"))?;
+        let input = translate::user_input(params.get("prompt").unwrap_or(&Value::Null));
+        self.call("turn/steer", json!({ "threadId": session, "expectedTurnId": turn, "input": input })).await?;
+        Ok(json!({}))
+    }
+
+    async fn rollback(&self, params: &Value) -> Result<Value, ResponseError> {
+        let session = str_param(params, "sessionId")?;
+        let turns = params.get("turns").and_then(Value::as_u64).filter(|n| *n > 0).ok_or_else(|| invalid("turns"))?;
+        match self.call("thread/rollback", json!({ "threadId": session, "numTurns": turns })).await {
+            Ok(_) => {}
+            Err(e)
+                if e.code == codes::METHOD_NOT_FOUND
+                    || (e.code == codes::INVALID_REQUEST
+                        && e.message.contains("unknown variant `thread/rollback`")) =>
+            {
+                self.revert(session, turns).await?;
+            }
+            Err(e) => return Err(e),
+        }
+        Ok(json!({}))
+    }
+
+    /// New Codex versions replace rollback counts with an exclusive turn id.
+    async fn revert(&self, session: &str, mut remaining: u64) -> Result<(), ResponseError> {
+        let mut cursor = Value::Null;
+        let mut seen = HashSet::new();
+        loop {
+            let page = self
+                .call(
+                    "thread/turns/list",
+                    json!({ "threadId": session, "sortDirection": "desc", "limit": remaining.min(100), "cursor": cursor }),
+                )
+                .await?;
+            let turns = page.get("data").and_then(Value::as_array).ok_or_else(|| invalid("Codex returned no turns"))?;
+            if remaining <= turns.len() as u64 {
+                let before = str_param(&turns[remaining as usize - 1], "id")?;
+                self.call("thread/revert", json!({ "threadId": session, "beforeTurnId": before })).await?;
+                return Ok(());
+            }
+            remaining -= turns.len() as u64;
+            let next = page.get("nextCursor").and_then(Value::as_str);
+            let Some(next) = next.filter(|next| seen.insert((*next).to_owned())) else {
+                return Err(invalid(
+                    "Codex history has fewer turns than the conversation; reload the task before editing",
+                ));
+            };
+            cursor = json!(next);
+        }
+    }
+
+    /// Stops following the session's thread (codex unloads it once nothing follows it).
+    async fn close(&self, params: &Value) -> Result<Value, ResponseError> {
+        let session = str_param(params, "sessionId")?;
+        let known = self.state.lock().threads.remove(session).is_some();
+        if known && let Err(e) = self.call("thread/unsubscribe", json!({ "threadId": session })).await {
+            tracing::debug!("codex: unsubscribing from {session}: {}", e.message);
+        }
+        Ok(json!({}))
+    }
+
+    /// `session/cancel`: interrupts the session's turn, or the one about to start.
+    fn cancel(&self, session: &str) {
+        let mut state = self.state.lock();
+        let Some(t) = state.threads.get_mut(session) else { return };
+        match t.turn.clone() {
+            Some(turn) => self.interrupt(session, &turn),
+            None => match t.prompt.as_mut() {
+                Some(p) => p.cancel = true,
+                None => t.early_cancel = Some(Instant::now()),
+            },
+        }
+    }
+
+    fn interrupt(&self, session: &str, turn: &str) {
+        let codex = self.codex().clone();
+        let params = json!({ "threadId": session, "turnId": turn });
+        self.runtime.spawn(async move {
+            if let Err(e) = codex.request::<_, Value>("turn/interrupt", params, None).await {
+                tracing::warn!("codex: interrupting the turn failed: {e}");
+            }
+        });
+    }
+
+    /// Turn `turn` of `session` is known: from `turn/start`'s answer, or `started` with
+    /// `turn/started`. Codex rejects an interrupt until it has started the turn, so a
+    /// stop that came earlier waits for that.
+    fn turn_known(&self, session: &str, turn: &str, started: bool) {
+        let mut state = self.state.lock();
+        let Some(t) = state.threads.get_mut(session) else { return };
+        if t.completed.as_deref() == Some(turn) {
+            return;
+        }
+        if started {
+            t.turn = Some(turn.to_owned());
+        }
+        let Some(p) = t.prompt.as_mut() else { return };
+        if p.turn.is_none() {
+            p.turn = Some(turn.to_owned());
+        }
+        if started && p.turn.as_deref() == Some(turn) && std::mem::take(&mut p.cancel) {
+            self.interrupt(session, turn);
+        }
+    }
+
+    fn codex_gone(&self) {
+        let mut state = self.state.lock();
+        state.gone = true;
+        for t in state.threads.values_mut() {
+            t.prompt = None;
+        }
+    }
+
+    fn emit(&self, session: &str, update: Value) {
+        if let Some(client) = self.client.get() {
+            let _ = client.notify("session/update", json!({ "sessionId": session, "update": update }));
+        }
+    }
+
+    fn on_codex_notification(&self, method: &str, params: &Value) {
+        let thread = params.get("threadId").and_then(Value::as_str).unwrap_or_default();
+        match method {
+            "turn/started" => {
+                if let Some(turn) = params.pointer("/turn/id").and_then(Value::as_str) {
+                    self.turn_known(thread, turn, true);
+                }
+                self.subagent_state(thread, json!({ "state": "running" }));
+            }
+            "turn/completed" => self.turn_completed(thread, params.get("turn").unwrap_or(&Value::Null)),
+            "item/started" => self.item(thread, params.get("item").unwrap_or(&Value::Null), false),
+            "item/completed" => self.item(thread, params.get("item").unwrap_or(&Value::Null), true),
+            "item/agentMessage/delta" | "item/plan/delta" => self.text(thread, params, "agent_message_chunk", false),
+            "item/reasoning/summaryTextDelta" => self.text(thread, params, "agent_thought_chunk", false),
+            "item/reasoning/textDelta" => self.text(thread, params, "agent_thought_chunk", true),
+            "item/reasoning/summaryPartAdded" => {
+                if params.get("summaryIndex").and_then(Value::as_u64).unwrap_or(0) > 0 {
+                    let mut p = params.clone();
+                    p["delta"] = json!("\n\n");
+                    self.text(thread, &p, "agent_thought_chunk", false);
+                }
+            }
+            "item/commandExecution/outputDelta" => self.command_output(thread, params),
+            "item/fileChange/patchUpdated" => {
+                let id = params.get("itemId").and_then(Value::as_str).unwrap_or_default();
+                let item = json!({ "id": id, "type": "fileChange", "changes": params.get("changes") });
+                self.with_thread(thread, |t, cwd| {
+                    let mut update = translate::tool_call(&item, true, cwd, None)?;
+                    update.as_object_mut()?.remove("status");
+                    t.last_chunk = None;
+                    Some(update)
+                });
+            }
+            "turn/plan/updated" => self.with_thread(thread, |t, _| {
+                t.last_chunk = None;
+                Some(translate::plan(params))
+            }),
+            "thread/tokenUsage/updated" => self.with_thread(thread, |_, _| translate::usage(params)),
+            "thread/name/updated" => self.with_thread(thread, |_, _| {
+                let title = params.get("threadName").and_then(Value::as_str)?;
+                Some(json!({ "sessionUpdate": "session_info_update", "title": title }))
+            }),
+            "thread/started" => self.thread_started(params.get("thread").unwrap_or(&Value::Null)),
+            "error" => {
+                if params.get("willRetry").and_then(Value::as_bool) != Some(true)
+                    && let Some(t) = self.state.lock().threads.get_mut(thread)
+                {
+                    t.error = params.get("error").cloned();
+                }
+            }
+            "account/rateLimits/updated" => self.state.lock().rate_limits = params.get("rateLimits").cloned(),
+            _ => {}
+        }
+    }
+
+    /// Sends what `f` makes of the known thread `thread` (given its cwd), under the lock so
+    /// updates keep their order.
+    fn with_thread(&self, thread: &str, f: impl FnOnce(&mut Thread, Option<&str>) -> Option<Value>) {
+        let mut state = self.state.lock();
+        let Some(t) = state.threads.get_mut(thread) else { return };
+        let cwd = t.cwd.clone();
+        if let Some(update) = f(t, cwd.as_deref()) {
+            self.emit(thread, update);
+        }
+    }
+
+    /// A streamed piece of a message or reasoning item. `raw` reasoning text is used only
+    /// for items without a summary.
+    fn text(&self, thread: &str, params: &Value, kind: &'static str, raw: bool) {
+        let item = params.get("itemId").and_then(Value::as_str).unwrap_or_default();
+        let Some(delta) = params.get("delta").and_then(Value::as_str).filter(|d| !d.is_empty()) else { return };
+        self.with_thread(thread, |t, _| {
+            let summarized = t.streamed.contains(&format!("summary:{item}"));
+            if raw && summarized {
+                return None;
+            }
+            if !raw && kind == "agent_thought_chunk" {
+                t.streamed.insert(format!("summary:{item}"));
+            }
+            t.streamed.insert(item.to_owned());
+            Some(t.chunk(kind, item, delta))
+        });
+    }
+
+    fn command_output(&self, thread: &str, params: &Value) {
+        let item = params.get("itemId").and_then(Value::as_str).unwrap_or_default();
+        let delta = params.get("delta").and_then(Value::as_str).unwrap_or_default();
+        self.with_thread(thread, |t, _| {
+            let out = t
+                .outputs
+                .entry(item.to_owned())
+                .or_insert_with(|| Output { text: String::new(), sent: Instant::now() - OUTPUT_EVERY });
+            out.text.push_str(delta);
+            if out.text.len() > 2 * translate::MAX_OUTPUT {
+                out.text = translate::tail(&out.text);
+            }
+            if out.sent.elapsed() < OUTPUT_EVERY {
+                return None;
+            }
+            out.sent = Instant::now();
+            t.last_chunk = None;
+            Some(translate::command_output(item, &out.text))
+        });
+    }
+
+    fn item(&self, thread: &str, item: &Value, done: bool) {
+        let id = item.get("id").and_then(Value::as_str).unwrap_or_default().to_owned();
+        match item.get("type").and_then(Value::as_str).unwrap_or_default() {
+            "userMessage" | "hookPrompt" => {}
+            ty @ ("agentMessage" | "plan" | "reasoning") => {
+                if !done {
+                    return;
+                }
+                let (kind, text) = if ty == "reasoning" {
+                    ("agent_thought_chunk", translate::reasoning_text(item))
+                } else {
+                    ("agent_message_chunk", item.get("text").and_then(Value::as_str).unwrap_or_default().to_owned())
+                };
+                self.with_thread(thread, |t, _| {
+                    if ty == "agentMessage" {
+                        t.answer = text.clone();
+                    }
+                    t.streamed.remove(&format!("summary:{id}"));
+                    if t.streamed.remove(&id) || text.is_empty() {
+                        return None;
+                    }
+                    Some(t.chunk(kind, &id, &text))
+                });
+            }
+            "subAgentActivity" => {
+                let child = item.get("agentThreadId").and_then(Value::as_str).unwrap_or_default();
+                let name = item.get("agentPath").and_then(Value::as_str).and_then(|p| p.rsplit('/').next());
+                if !done && item.get("kind").and_then(Value::as_str) == Some("started") {
+                    self.spawned(thread, child, name, None, &id);
+                }
+            }
+            "collabAgentToolCall" if item.get("tool").and_then(Value::as_str) == Some("spawnAgent") => {
+                if !done {
+                    return;
+                }
+                let prompt = item.get("prompt").and_then(Value::as_str);
+                for child in item.get("receiverThreadIds").and_then(Value::as_array).into_iter().flatten() {
+                    if let Some(child) = child.as_str() {
+                        self.spawned(thread, child, None, prompt, &id);
+                    }
+                }
+            }
+            _ => self.with_thread(thread, |t, cwd| {
+                let output = if done { t.outputs.remove(&id).map(|o| o.text) } else { None };
+                let update = translate::tool_call(item, done, cwd, output.as_deref())?;
+                if done {
+                    t.items.remove(&id);
+                } else {
+                    t.items.insert(id.clone(), item.clone());
+                }
+                t.last_chunk = None;
+                Some(update)
+            }),
+        }
+    }
+
+    /// A subagent thread `child` started by session `parent`: announced on the parent, with
+    /// what it was asked.
+    fn spawned(&self, parent: &str, child: &str, name: Option<&str>, prompt: Option<&str>, call: &str) {
+        if child.is_empty() {
+            return;
+        }
+        let mut state = self.state.lock();
+        if !state.threads.contains_key(parent) {
+            return;
+        }
+        let cwd = state.threads.get(parent).and_then(|t| t.cwd.clone());
+        let known = state.threads.contains_key(child);
+        let t = state.threads.entry(child.to_owned()).or_default();
+        t.parent = Some(parent.to_owned());
+        t.cwd = t.cwd.take().or(cwd);
+        if !known {
+            let mut announce = json!({ "sessionUpdate": "subagent_update", "sessionId": child,
+                "state": { "state": "running" }, "capabilities": { "cancel": {} } });
+            if let Some(name) = name {
+                announce["title"] = json!(name);
+            }
+            self.emit(parent, announce);
+        }
+        if let Some(prompt) = prompt.filter(|p| !p.is_empty()) {
+            if known {
+                self.emit(
+                    parent,
+                    json!({ "sessionUpdate": "subagent_update", "sessionId": child, "description": prompt }),
+                );
+            }
+            self.emit(
+                parent,
+                json!({ "sessionUpdate": "session_message", "messageId": call, "senderSessionId": parent,
+                    "recipientSessionId": child, "content": [{ "type": "text", "text": prompt }] }),
+            );
+        }
+    }
+
+    /// A thread codex started on its own: a subagent when its parent is a session here.
+    fn thread_started(&self, thread: &Value) {
+        let (Some(id), Some(parent)) =
+            (thread.get("id").and_then(Value::as_str), thread.get("parentThreadId").and_then(Value::as_str))
+        else {
+            return;
+        };
+        let name = thread.get("agentNickname").or(thread.get("agentRole")).and_then(Value::as_str);
+        let known = self.state.lock().threads.contains_key(id);
+        self.spawned(parent, id, name, None, "");
+        if known && let Some(name) = name {
+            self.emit(parent, json!({ "sessionUpdate": "subagent_update", "sessionId": id, "title": name }));
+        }
+    }
+
+    /// Reports a subagent thread's state on its parent.
+    fn subagent_state(&self, thread: &str, state_of: Value) {
+        let parent = self.state.lock().threads.get(thread).and_then(|t| t.parent.clone());
+        if let Some(parent) = parent {
+            self.emit(
+                parent.as_str(),
+                json!({ "sessionUpdate": "subagent_update", "sessionId": thread, "state": state_of }),
+            );
+        }
+    }
+
+    fn turn_completed(&self, thread: &str, turn: &Value) {
+        let id = turn.get("id").and_then(Value::as_str).unwrap_or_default();
+        let (parent, answer) = {
+            let mut state = self.state.lock();
+            let Some(t) = state.threads.get_mut(thread) else { return };
+            if t.turn.as_deref().is_none_or(|r| r == id) {
+                t.turn = None;
+            }
+            t.completed = Some(id.to_owned());
+            t.items.clear();
+            t.last_chunk = None;
+            let error = t.error.take();
+            if t.prompt.as_ref().is_some_and(|p| p.turn.as_deref().is_none_or(|p| p == id))
+                && let Some(p) = t.prompt.take()
+            {
+                let _ = p.done.send((turn.clone(), error.clone()));
+            }
+            let answer = std::mem::take(&mut t.answer);
+            (t.parent.clone(), (answer, error))
+        };
+        let Some(parent) = parent else { return };
+        let (answer, error) = answer;
+        let mut state_of = match turn.get("status").and_then(Value::as_str) {
+            Some("interrupted") => json!({ "state": "idle", "stopReason": "cancelled" }),
+            Some("failed") => json!({ "state": "idle", "stopReason": "error" }),
+            _ => json!({ "state": "idle", "stopReason": "end_turn" }),
+        };
+        if let Some(e) = turn.get("error").filter(|e| !e.is_null()).or(error.as_ref()) {
+            state_of["error"] = json!({ "code": codes::INTERNAL_ERROR, "message": translate::error_message(e) });
+        }
+        self.emit(&parent, json!({ "sessionUpdate": "subagent_update", "sessionId": thread, "state": state_of }));
+        if !answer.is_empty() {
+            self.emit(
+                &parent,
+                json!({ "sessionUpdate": "session_message", "messageId": format!("{thread}:{id}"),
+                    "senderSessionId": thread, "recipientSessionId": parent,
+                    "content": [{ "type": "text", "text": answer }] }),
+            );
+        }
+    }
+
+    /// Requests from codex: approvals and questions, asked as ACP permission requests.
+    fn on_codex_request(&self, method: &str, params: &Value) -> Result<Value, (i64, String)> {
+        let thread = params.get("threadId").and_then(Value::as_str).unwrap_or_default().to_owned();
+        let item_id = params.get("itemId").and_then(Value::as_str).unwrap_or_default().to_owned();
+        let (item, cwd) = {
+            let state = self.state.lock();
+            let t = state.threads.get(&thread);
+            (t.and_then(|t| t.items.get(&item_id).cloned()), t.and_then(|t| t.cwd.clone()))
+        };
+        let cwd = cwd.as_deref();
+        let reason = params.get("reason").and_then(Value::as_str).filter(|r| !r.is_empty());
+        let decline = json!({ "decision": "decline" });
+        match method {
+            "item/commandExecution/requestApproval" => {
+                let choices = translate::decisions(params, true);
+                let title = translate::command_approval_title(params, item.as_ref(), cwd);
+                let call = tool_call_of(
+                    &item_id,
+                    &title,
+                    "execute",
+                    reason,
+                    Some(json!({ "command": params.get("command"), "cwd": params.get("cwd") })),
+                );
+                Ok(self.ask(&thread, call, &choices, decline))
+            }
+            "item/fileChange/requestApproval" => {
+                let choices = translate::decisions(params, false);
+                let title = translate::file_approval_title(item.as_ref(), cwd);
+                let mut call = tool_call_of(&item_id, &title, "edit", reason, None);
+                if let Some(content) = item
+                    .as_ref()
+                    .and_then(|i| translate::tool_call(i, false, cwd, None))
+                    .and_then(|c| c.get("content").cloned())
+                {
+                    call["content"] = content;
+                }
+                Ok(self.ask(&thread, call, &choices, decline))
+            }
+            "item/permissions/requestApproval" => {
+                let requested = params.get("permissions").cloned().unwrap_or(json!({}));
+                let choice = |id: &str, name: &str, kind: &str, answer: Value| Choice {
+                    option: json!({ "optionId": id, "name": name, "kind": kind }),
+                    answer,
+                };
+                let choices = [
+                    choice(
+                        "turn",
+                        "Allow for this turn",
+                        "allow_once",
+                        json!({ "permissions": requested, "scope": "turn" }),
+                    ),
+                    choice(
+                        "session",
+                        "Allow for this session",
+                        "allow_always",
+                        json!({ "permissions": requested, "scope": "session" }),
+                    ),
+                    choice("decline", "Decline", "reject_once", json!({ "permissions": {}, "scope": "turn" })),
+                ];
+                let title = reason.map_or_else(|| "Allow more access".to_owned(), str::to_owned);
+                let call = tool_call_of(&item_id, &title, "other", None, Some(requested.clone()));
+                Ok(self.ask(&thread, call, &choices, json!({ "permissions": {}, "scope": "turn" })))
+            }
+            "item/tool/requestUserInput" => {
+                let mut answers = serde_json::Map::new();
+                for q in params.get("questions").and_then(Value::as_array).into_iter().flatten() {
+                    let Some(qid) = q.get("id").and_then(Value::as_str) else { continue };
+                    let choices: Vec<Choice> = q
+                        .get("options")
+                        .and_then(Value::as_array)
+                        .into_iter()
+                        .flatten()
+                        .enumerate()
+                        .filter_map(|(i, o)| {
+                            let label = o.get("label")?.as_str()?;
+                            Some(Choice {
+                                option: json!({ "optionId": i.to_string(), "name": label, "kind": "allow_once" }),
+                                answer: json!({ "answers": [label] }),
+                            })
+                        })
+                        .collect();
+                    if choices.is_empty() {
+                        continue;
+                    }
+                    let title = q.get("question").and_then(Value::as_str).unwrap_or("Codex has a question");
+                    let call = tool_call_of(&item_id, title, "other", None, None);
+                    let answer = self.ask(&thread, call, &choices, Value::Null);
+                    if !answer.is_null() {
+                        answers.insert(qid.to_owned(), answer);
+                    }
+                }
+                Ok(json!({ "answers": answers }))
+            }
+            "mcpServer/elicitation/request" => {
+                let server = params.get("serverName").and_then(Value::as_str).unwrap_or("An MCP server");
+                let message = params.get("message").and_then(Value::as_str).unwrap_or_default();
+                let accept = match params.get("mode").and_then(Value::as_str) {
+                    Some("url") => json!({ "action": "accept" }),
+                    _ => json!({ "action": "accept", "content": {} }),
+                };
+                let choices = [
+                    Choice {
+                        option: json!({ "optionId": "accept", "name": "Accept", "kind": "allow_once" }),
+                        answer: accept,
+                    },
+                    Choice {
+                        option: json!({ "optionId": "decline", "name": "Decline", "kind": "reject_once" }),
+                        answer: json!({ "action": "decline" }),
+                    },
+                ];
+                let mut title = format!("{server}: {message}");
+                if let Some(url) = params.get("url").and_then(Value::as_str) {
+                    title.push_str(&format!(" ({url})"));
+                }
+                let call = tool_call_of(&format!("elicitation:{server}"), &title, "other", None, None);
+                Ok(self.ask(&thread, call, &choices, json!({ "action": "decline" })))
+            }
+            _ => Err((codes::METHOD_NOT_FOUND, format!("unsupported request {method}"))),
+        }
+    }
+
+    /// Asks the client; returns the answer for codex (`otherwise` when cancelled).
+    fn ask(&self, session: &str, tool_call: Value, choices: &[Choice], otherwise: Value) -> Value {
+        let Some(client) = self.client.get().cloned() else { return otherwise };
+        let options: Vec<Value> = choices.iter().map(|c| c.option.clone()).collect();
+        let params = json!({ "sessionId": session, "toolCall": tool_call, "options": options });
+        let outcome: Result<Value, RpcError> =
+            self.runtime.block_on(client.request("session/request_permission", params, None));
+        match outcome {
+            Ok(outcome) => translate::answer_of(choices, &outcome, otherwise),
+            Err(e) => {
+                tracing::debug!("codex: permission request failed: {e}");
+                otherwise
+            }
+        }
+    }
+}
+
+impl Thread {
+    /// A text chunk of `item`; a new item of the same kind right after another starts a
+    /// new paragraph.
+    fn chunk(&mut self, kind: &'static str, item: &str, text: &str) -> Value {
+        let text = match &self.last_chunk {
+            Some((k, i)) if *k == kind && i != item => format!("\n\n{text}"),
+            _ => text.to_owned(),
+        };
+        self.last_chunk = Some((kind, item.to_owned()));
+        translate::chunk(kind, &text)
+    }
+}
+
+/// The ACP `toolCall` of a permission request.
+fn tool_call_of(id: &str, title: &str, kind: &str, reason: Option<&str>, raw: Option<Value>) -> Value {
+    let mut call = json!({ "toolCallId": id, "title": title, "kind": kind, "status": "pending" });
+    if let Some(reason) = reason {
+        call["content"] = json!([{ "type": "content", "content": { "type": "text", "text": reason } }]);
+    }
+    if let Some(raw) = raw {
+        call["rawInput"] = raw;
+    }
+    call
+}
+
+/// The `session/prompt` answer for a turn that ended.
+fn stop_reason(turn: &Value, last_error: Option<Value>, rate_limits: Option<&Value>) -> Result<Value, ResponseError> {
+    let stop = match turn.get("status").and_then(Value::as_str) {
+        Some("interrupted") => "cancelled",
+        Some("failed") => {
+            let e = turn.get("error").filter(|e| !e.is_null()).cloned().or(last_error).unwrap_or(json!({}));
+            let message = translate::error_message(&e);
+            return match translate::classify(&e, rate_limits) {
+                Failure::Refusal => Ok(json!({ "stopReason": "refusal" })),
+                Failure::UsageLimit(resets) => Err(ResponseError {
+                    code: codes::INTERNAL_ERROR,
+                    message,
+                    data: Some(json!({ "openidea": { "usageLimit": { "resetsAtMs": resets } } })),
+                }),
+                Failure::Auth => Err(error(AUTH_REQUIRED, format!("Codex authentication failed: {message}"))),
+                Failure::Other => Err(error(codes::INTERNAL_ERROR, message)),
+            };
+        }
+        _ => "end_turn",
+    };
+    Ok(json!({ "stopReason": stop }))
+}

crates/ide-agent/src/native/codex/tests.rs

@@ -0,0 +1,970 @@
+//! The Codex shim against codex transcripts: frames recorded from the real
+//! `codex app-server` (`record_codex_fixtures`, ignored) or written by hand where a
+//! recording isn't possible, played back by a fake codex.
+//!
+//! A transcript is JSONL: a `{"type":"meta",…}` line, then `{"dir":"out","frame":…}` for
+//! each frame the shim sent and `{"dir":"in","frame":…}` for each frame codex sent.
+
+use super::translate::*;
+use super::*;
+use std::collections::VecDeque;
+use std::path::PathBuf;
+use tokio::io::{AsyncBufReadExt, AsyncRead, AsyncWrite, AsyncWriteExt, BufReader};
+
+// ---- Pure translations -------------------------------------------------------------
+
+fn models() -> Vec<ModelInfo> {
+    models_of(&json!({"data": [
+        {"id": "big", "model": "big", "displayName": "Big", "description": "d", "hidden": false, "isDefault": true,
+         "defaultReasoningEffort": "low",
+         "supportedReasoningEfforts": [{"reasoningEffort": "low", "description": "fast"}, {"reasoningEffort": "xhigh", "description": ""}]},
+        {"id": "plain", "model": "plain-slug", "displayName": "", "description": "", "hidden": false, "isDefault": false,
+         "supportedReasoningEfforts": []},
+        {"id": "secret", "model": "secret", "displayName": "S", "description": "", "hidden": true, "isDefault": false,
+         "supportedReasoningEfforts": []}
+    ]}))
+}
+
+#[test]
+fn settings_follow_the_thread_and_the_models() {
+    let models = models();
+    let result = json!({"model": "big", "reasoningEffort": null, "approvalPolicy": "untrusted",
+        "sandbox": {"type": "workspaceWrite"}});
+    let mut s = Settings::of(&result, &models);
+    assert_eq!(s, Settings { model: "big".into(), effort: Some("low".into()), mode: Mode::Ask });
+
+    let options = config_options(&models, &s);
+    let ids: Vec<&str> = options.as_array().unwrap().iter().map(|o| o["id"].as_str().unwrap()).collect();
+    assert_eq!(ids, [MODEL, EFFORT, MODE]);
+    assert_eq!(options[0]["options"].as_array().unwrap().len(), 2, "hidden models are left out");
+    assert_eq!(options[1]["category"], "thought_level");
+    assert_eq!(options[1]["options"][1]["name"], "Extra high");
+    assert_eq!(options[2]["currentValue"], "ask");
+
+    // A model without efforts drops the option; its slug is what codex gets.
+    s.set(&models, MODEL, "plain").unwrap();
+    assert_eq!((s.effort.as_deref(), s.model_slug(&models).as_str()), (None, "plain-slug"));
+    assert_eq!(config_options(&models, &s).as_array().unwrap().len(), 2);
+    assert!(s.set(&models, EFFORT, "low").is_err());
+    assert!(s.set(&models, MODEL, "nope").is_err());
+    s.set(&models, MODE, "full-access").unwrap();
+    assert_eq!((s.mode.approval_policy(), s.mode.sandbox_policy()), ("never", json!({"type": "dangerFullAccess"})));
+
+    // A model codex runs that it doesn't list is still offered.
+    let s = Settings::of(&json!({"model": "custom", "sandbox": {"type": "readOnly"}}), &models);
+    assert_eq!(s.mode, Mode::ReadOnly);
+    let options = config_options(&models, &s);
+    assert_eq!(options[0]["options"][2], json!({"value": "custom", "name": "custom"}));
+}
+
+#[test]
+fn prompts_become_user_input() {
+    let input = user_input(&json!([
+        {"type": "text", "text": "fix it"},
+        {"type": "resource", "resource": {"uri": "file:///p/a%20b.rs", "text": "fn x() {}"}},
+        {"type": "resource_link", "uri": "file:///p/big.bin", "name": "big.bin"},
+        {"type": "image", "mimeType": "image/jpeg", "data": "AAA"},
+        {"type": "audio", "data": "x"}
+    ]));
+    assert_eq!(
+        input,
+        vec![
+            json!({"type": "text", "text": "fix it"}),
+            json!({"type": "text", "text": "<file path=\"/p/a b.rs\">\nfn x() {}\n</file>"}),
+            json!({"type": "text", "text": "/p/big.bin"}),
+            json!({"type": "image", "url": "data:image/jpeg;base64,AAA"}),
+        ]
+    );
+}
+
+#[test]
+fn commands_are_titled_by_what_they_do() {
+    let cmd = |actions: Value| {
+        json!({"id": "c", "type": "commandExecution", "command": "/bin/zsh -lc 'x'", "cwd": "/p",
+            "status": "inProgress", "commandActions": actions})
+    };
+    let call = tool_call(
+        &cmd(json!([{"type": "read", "command": "cat a.rs", "name": "a.rs", "path": "/p/a.rs"}])),
+        false,
+        Some("/p"),
+        None,
+    )
+    .unwrap();
+    assert_eq!((call["title"].as_str(), call["kind"].as_str()), (Some("Read a.rs"), Some("read")));
+    assert_eq!(call["locations"], json!([{"path": "/p/a.rs"}]));
+    let call = tool_call(
+        &cmd(json!([{"type": "search", "command": "rg x src", "query": "x", "path": "/p/src"}])),
+        false,
+        Some("/p"),
+        None,
+    )
+    .unwrap();
+    assert_eq!(call["title"], "Search x in src");
+    let call = tool_call(&cmd(json!([{"type": "unknown", "command": "cargo test"}])), false, None, Some("ok")).unwrap();
+    assert_eq!(
+        (call["title"].as_str(), call["kind"].as_str(), call["status"].as_str()),
+        (Some("cargo test"), Some("execute"), Some("in_progress"))
+    );
+    assert_eq!(call["content"][0]["content"]["text"], "ok");
+
+    let mut done = cmd(json!([]));
+    done["status"] = json!("declined");
+    done["exitCode"] = json!(1);
+    let call = tool_call(&done, true, None, None).unwrap();
+    assert_eq!((call["sessionUpdate"].as_str(), call["status"].as_str()), (Some("tool_call_update"), Some("failed")));
+    assert_eq!(call["title"], "/bin/zsh -lc 'x'");
+    assert_eq!(call["rawOutput"], json!({"exitCode": 1}));
+}
+
+#[test]
+fn file_changes_carry_diffs() {
+    let item = json!({"id": "f", "type": "fileChange", "status": "completed", "changes": [
+        {"path": "/p/new.txt", "kind": {"type": "add"}, "diff": "hello\n"},
+        {"path": "/p/a.rs", "kind": {"type": "update", "move_path": null},
+         "diff": "@@ -1,3 +1,3 @@\n a\n-b\n+B\n c\n@@ -9 +9,2 @@\n-z\n+y\n+w\n\\ No newline at end of file\n"},
+        {"path": "/p/old.rs", "kind": {"type": "delete"}, "diff": "gone\n"}
+    ]});
+    let call = tool_call(&item, true, Some("/p"), None).unwrap();
+    assert_eq!(
+        (call["title"].as_str(), call["kind"].as_str(), call["status"].as_str()),
+        (Some("Edit 3 files"), Some("edit"), Some("completed"))
+    );
+    assert_eq!(
+        call["content"],
+        json!([
+            {"type": "diff", "path": "/p/new.txt", "oldText": "", "newText": "hello\n"},
+            {"type": "diff", "path": "/p/a.rs", "oldText": "a\nb\nc\nz\n", "newText": "a\nB\nc\ny\nw\n"},
+            {"type": "diff", "path": "/p/old.rs", "oldText": "gone\n", "newText": ""}
+        ])
+    );
+    let one = json!({"id": "f", "type": "fileChange", "status": "inProgress", "changes": [
+        {"path": "/p/a.rs", "kind": {"type": "update", "move_path": "/p/b.rs"}, "diff": "@@ -1 +1 @@\n-x\n+y\n"}]});
+    let call = tool_call(&one, false, Some("/p"), None).unwrap();
+    assert_eq!((call["title"].as_str(), call["kind"].as_str()), (Some("Move a.rs to b.rs"), Some("move")));
+    assert_eq!(call["content"][0]["path"], "/p/b.rs");
+    assert_eq!(file_approval_title(Some(&one), Some("/p")), "Move a.rs to b.rs");
+}
+
+#[test]
+fn other_items() {
+    let search = json!({"id": "w", "type": "webSearch", "query": "", "action": null});
+    assert_eq!(tool_call(&search, false, None, None).unwrap()["title"], "Search the web");
+    let search =
+        json!({"id": "w", "type": "webSearch", "query": "rust", "action": {"type": "search", "query": "rust"}});
+    let call = tool_call(&search, true, None, None).unwrap();
+    assert_eq!(
+        (call["title"].as_str(), call["status"].as_str(), call["kind"].as_str()),
+        (Some("Search the web: rust"), Some("completed"), Some("fetch"))
+    );
+    let mcp = json!({"id": "m", "type": "mcpToolCall", "server": "gh", "tool": "issue", "status": "failed",
+        "arguments": {"n": 1}, "result": {"content": [{"type": "text", "text": "partial"}]}, "error": {"message": "boom"}});
+    let call = tool_call(&mcp, true, None, None).unwrap();
+    assert_eq!(call["title"], "gh: issue");
+    assert_eq!(call["content"][1]["content"]["text"], "boom");
+    assert_eq!(call["rawInput"], json!({"n": 1}));
+    for skipped in ["agentMessage", "reasoning", "userMessage", "subAgentActivity"] {
+        assert!(tool_call(&json!({"id": "x", "type": skipped}), false, None, None).is_none());
+    }
+    let spawn = json!({"id": "x", "type": "collabAgentToolCall", "tool": "spawnAgent", "status": "completed"});
+    assert!(tool_call(&spawn, true, None, None).is_none());
+
+    let plan = plan(&json!({"plan": [{"step": "a", "status": "completed"}, {"step": "b", "status": "inProgress"}]}));
+    assert_eq!(plan["entries"][1], json!({"content": "b", "priority": "medium", "status": "in_progress"}));
+    let u = usage(
+        &json!({"tokenUsage": {"last": {"totalTokens": 20}, "total": {"totalTokens": 99}, "modelContextWindow": 1000}}),
+    );
+    assert_eq!(u, Some(json!({"sessionUpdate": "usage_update", "used": 20, "size": 1000})));
+    assert!(usage(&json!({"tokenUsage": {"last": {"totalTokens": 20}, "modelContextWindow": null}})).is_none());
+    assert_eq!(reasoning_text(&json!({"summary": ["a", "b"], "content": ["raw"]})), "a\n\nb");
+    assert!(tail(&"é".repeat(MAX_OUTPUT)).starts_with('…'));
+}
+
+#[test]
+fn failures_are_classified() {
+    let limits = json!({"primary": {"usedPercent": 100, "resetsAt": 1_800_000_000}, "secondary": {"usedPercent": 40, "resetsAt": 1_900_000_000}});
+    let e = json!({"message": "You've hit your usage limit.", "codexErrorInfo": "usageLimitExceeded"});
+    assert_eq!(classify(&e, Some(&limits)), Failure::UsageLimit(Some(1.8e12)));
+    assert_eq!(classify(&e, None), Failure::UsageLimit(None));
+    let e = json!({"message": "x", "codexErrorInfo": {"responseTooManyFailedAttempts": {"httpStatusCode": 429}}});
+    assert_eq!(classify(&e, None), Failure::UsageLimit(None));
+    assert_eq!(classify(&json!({"message": "x", "codexErrorInfo": "unauthorized"}), None), Failure::Auth);
+    let e = json!({"message": "unexpected status 401 Unauthorized: Missing bearer", "codexErrorInfo": "other"});
+    assert_eq!(classify(&e, None), Failure::Auth);
+    assert_eq!(classify(&json!({"message": "no", "codexErrorInfo": "cyberPolicy"}), None), Failure::Refusal);
+    assert_eq!(
+        classify(&json!({"message": "too long", "codexErrorInfo": "contextWindowExceeded"}), None),
+        Failure::Other
+    );
+    assert_eq!(error_message(&json!({"message": "Failed", "additionalDetails": "because"})), "Failed\nbecause");
+
+    let usage_limit = stop_reason(
+        &json!({"status": "failed", "error": null}),
+        Some(json!({"message": "limit", "codexErrorInfo": "usageLimitExceeded"})),
+        Some(&limits),
+    )
+    .unwrap_err();
+    assert_eq!(usage_limit.data, Some(json!({"openidea": {"usageLimit": {"resetsAtMs": 1.8e12}}})));
+    assert_eq!(stop_reason(&json!({"status": "interrupted"}), None, None).unwrap(), json!({"stopReason": "cancelled"}));
+}
+
+#[test]
+fn approvals_offer_what_codex_offers_and_always_a_decline() {
+    let params = json!({"availableDecisions": ["accept",
+        {"acceptWithExecpolicyAmendment": {"execpolicy_amendment": ["/bin/bash", "-lc", "make"]}},
+        {"applyNetworkPolicyAmendment": {"network_policy_amendment": {"host": "crates.io", "action": "allow"}}},
+        "cancel"]});
+    let choices = decisions(&params, true);
+    let options: Vec<(&str, &str, &str)> = choices
+        .iter()
+        .map(|c| {
+            (
+                c.option["optionId"].as_str().unwrap(),
+                c.option["name"].as_str().unwrap(),
+                c.option["kind"].as_str().unwrap(),
+            )
+        })
+        .collect();
+    assert_eq!(
+        options,
+        [
+            ("accept", "Allow once", "allow_once"),
+            ("acceptWithExecpolicyAmendment", "Always allow `make`", "allow_always"),
+            ("applyNetworkPolicyAmendment:allow:crates.io", "Always allow crates.io", "allow_always"),
+            ("decline", "Decline", "reject_once"),
+            ("cancel", "Decline and stop", "reject_once"),
+        ]
+    );
+    let selected = |id: &str| json!({"outcome": {"outcome": "selected", "optionId": id}});
+    let decline = json!({"decision": "decline"});
+    assert_eq!(
+        answer_of(&choices, &selected("acceptWithExecpolicyAmendment"), decline.clone()),
+        json!({"decision": params["availableDecisions"][1]})
+    );
+    assert_eq!(answer_of(&choices, &json!({"outcome": {"outcome": "cancelled"}}), decline.clone()), decline);
+    assert_eq!(answer_of(&choices, &selected("zzz"), decline.clone()), decline);
+    let ids: Vec<Value> = decisions(&json!({}), false).iter().map(|c| c.option["optionId"].clone()).collect();
+    assert_eq!(ids, [json!("accept"), json!("acceptForSession"), json!("decline"), json!("cancel")]);
+    assert_eq!(
+        command_approval_title(
+            &json!({"command": "/bin/zsh -lc 'ls'", "commandActions": [{"type": "unknown", "command": "touch b"}]}),
+            None,
+            None
+        ),
+        "Run touch b"
+    );
+}
+
+#[test]
+fn history_replays_turns() {
+    let thread = json!({"turns": [{"id": "t", "status": "completed", "items": [
+        {"type": "userMessage", "id": "u", "content": [{"type": "text", "text": "hi"}]},
+        {"type": "reasoning", "id": "r", "summary": ["think"]},
+        {"type": "agentMessage", "id": "a", "text": "hello"},
+        {"type": "commandExecution", "id": "c", "command": "ls", "cwd": "/p", "status": "completed",
+         "commandActions": [], "aggregatedOutput": "a.txt\n", "exitCode": 0}
+    ]}]});
+    let updates = history(&thread, Some("/p"));
+    let kinds: Vec<&str> = updates.iter().map(|u| u["sessionUpdate"].as_str().unwrap()).collect();
+    assert_eq!(
+        kinds,
+        ["user_message_chunk", "agent_thought_chunk", "agent_message_chunk", "tool_call", "tool_call_update"]
+    );
+    assert_eq!(updates[4]["status"], "completed");
+}
+
+// ---- Transcripts ---------------------------------------------------------------------
+
+/// The ACP client: records updates and answers permission requests in order.
+#[derive(Default)]
+struct Client {
+    updates: Mutex<Vec<Value>>,
+    asked: Mutex<Vec<Value>>,
+    /// Option ids to choose; `None` (or none left) cancels.
+    answers: Mutex<VecDeque<Option<&'static str>>>,
+}
+
+impl Handler for Client {
+    fn on_notification(&self, method: &str, params: Value) {
+        if method == "session/update" {
+            self.updates.lock().push(params);
+        }
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        assert_eq!(method, "session/request_permission");
+        self.asked.lock().push(params);
+        Ok(match self.answers.lock().pop_front().flatten() {
+            Some(id) => json!({ "outcome": { "outcome": "selected", "optionId": id } }),
+            None => json!({ "outcome": { "outcome": "cancelled" } }),
+        })
+    }
+}
+
+impl Client {
+    /// The updates of `session`, as `(sessionUpdate, update)`.
+    fn of(&self, session: &str) -> Vec<Value> {
+        self.updates.lock().iter().filter(|u| u["sessionId"] == session).map(|u| u["update"].clone()).collect()
+    }
+
+    /// The text of the `kind` chunks of `session`.
+    fn text(&self, session: &str, kind: &str) -> String {
+        self.of(session)
+            .iter()
+            .filter(|u| u["sessionUpdate"] == kind)
+            .filter_map(|u| u.pointer("/content/text").and_then(Value::as_str).map(str::to_owned))
+            .collect()
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum Scenario {
+    AuthFailure,
+    Interrupt,
+    Resume,
+    Steer,
+    Simple,
+    MultiTurn,
+    Approvals,
+    UsageLimit,
+    Subagent,
+}
+
+impl Scenario {
+    fn file(self) -> &'static str {
+        match self {
+            Scenario::AuthFailure => "auth_failure",
+            Scenario::Interrupt => "interrupt",
+            Scenario::Resume => "resume",
+            Scenario::Steer => "steer",
+            Scenario::Simple => "simple",
+            Scenario::MultiTurn => "multi_turn",
+            Scenario::Approvals => "approvals",
+            Scenario::UsageLimit => "usage_limit",
+            Scenario::Subagent => "subagent",
+        }
+    }
+}
+
+/// What a scenario's ACP requests returned, by label.
+type Results = Vec<(&'static str, Result<Value, RpcError>)>;
+
+fn result<'a>(results: &'a Results, label: &str) -> &'a Result<Value, RpcError> {
+    &results.iter().find(|(l, _)| *l == label).unwrap_or_else(|| panic!("no {label}")).1
+}
+
+async fn request(acp: &Peer, method: &str, params: Value) -> Result<Value, RpcError> {
+    acp.request(method, params, None).await
+}
+
+fn text(t: &str) -> Value {
+    json!([{ "type": "text", "text": t }])
+}
+
+/// Drives the shim over ACP. `thread` is the thread a resume loads.
+async fn drive(scenario: Scenario, acp: &Peer, client: &Client, cwd: &str, thread: Option<&str>) -> Results {
+    let mut out: Results = Vec::new();
+    out.push((
+        "initialize",
+        request(acp, "initialize", json!({ "protocolVersion": 1, "clientCapabilities": {} })).await,
+    ));
+    if scenario == Scenario::Resume {
+        let thread = thread.expect("a thread to resume");
+        out.push((
+            "load",
+            request(acp, "session/load", json!({ "sessionId": thread, "cwd": cwd, "mcpServers": [] })).await,
+        ));
+        out.push((
+            "fork",
+            request(acp, "session/fork", json!({ "sessionId": thread, "cwd": cwd, "mcpServers": [] })).await,
+        ));
+        out.push(("rollback", request(acp, "_openidea/rollback", json!({ "sessionId": thread, "turns": 1 })).await));
+        out.push(("close", request(acp, "session/close", json!({ "sessionId": thread })).await));
+        return out;
+    }
+    let new = request(acp, "session/new", json!({ "cwd": cwd, "mcpServers": [] })).await;
+    let session = new.as_ref().ok().and_then(|v| v["sessionId"].as_str()).unwrap_or_default().to_owned();
+    out.push(("new", new));
+    let prompt = |t: &str| json!({ "sessionId": session, "prompt": text(t) });
+    let set = |id: &str, value: &str| json!({ "sessionId": session, "configId": id, "value": value });
+    match scenario {
+        Scenario::AuthFailure | Scenario::Simple | Scenario::UsageLimit | Scenario::Subagent => {
+            out.push(("prompt", request(acp, "session/prompt", prompt("Reply with the single word: hi")).await));
+        }
+        Scenario::Interrupt => {
+            out.push(("mode", request(acp, "session/set_config_option", set(MODE, "read-only")).await));
+            let running = {
+                let (acp, p) = (acp.clone(), prompt("Count to five."));
+                tokio::spawn(async move { request(&acp, "session/prompt", p).await })
+            };
+            acp.notify("session/cancel", json!({ "sessionId": session })).unwrap();
+            out.push(("prompt", running.await.unwrap()));
+        }
+        Scenario::Steer => {
+            let running = {
+                let (acp, p) = (acp.clone(), prompt("Count to five."));
+                tokio::spawn(async move { request(&acp, "session/prompt", p).await })
+            };
+            let mut steered = Err(RpcError::Timeout);
+            for _ in 0..200 {
+                steered = request(
+                    acp,
+                    "_openidea/steer",
+                    json!({ "sessionId": session, "prompt": text("Count to three instead.") }),
+                )
+                .await;
+                match &steered {
+                    Err(RpcError::Server { message, .. }) if message.contains("no turn") => {
+                        tokio::time::sleep(Duration::from_millis(20)).await;
+                    }
+                    _ => break,
+                }
+            }
+            out.push(("steer", steered));
+            acp.notify("session/cancel", json!({ "sessionId": session })).unwrap();
+            out.push(("prompt", running.await.unwrap()));
+        }
+        Scenario::MultiTurn => {
+            out.push(("first", request(acp, "session/prompt", prompt("Reply with: one")).await));
+            out.push(("model", request(acp, "session/set_config_option", set(MODEL, "gpt-5.5")).await));
+            out.push(("effort", request(acp, "session/set_config_option", set(EFFORT, "high")).await));
+            out.push(("second", request(acp, "session/prompt", prompt("Reply with: two")).await));
+        }
+        Scenario::Approvals => {
+            client.answers.lock().extend([Some("accept"), None]);
+            out.push(("prompt", request(acp, "session/prompt", prompt("Run `touch b.txt`, then write a.txt.")).await));
+        }
+        Scenario::Resume => unreachable!(),
+    }
+    out
+}
+
+struct Transcript {
+    meta: Value,
+    /// `(sent by the shim, frame)`.
+    frames: Vec<(bool, Value)>,
+}
+
+fn fixture_dir() -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/codex")
+}
+
+fn load(name: &str) -> Transcript {
+    let text = std::fs::read_to_string(fixture_dir().join(format!("{name}.jsonl"))).unwrap();
+    let mut lines = text.lines().filter(|l| !l.trim().is_empty()).map(|l| serde_json::from_str::<Value>(l).unwrap());
+    let meta = lines.next().unwrap();
+    assert_eq!(meta["type"], "meta");
+    let frames = lines.map(|l| (l["dir"] == "out", l["frame"].clone())).collect();
+    Transcript { meta, frames }
+}
+
+/// Plays codex: waits for each frame the shim should send, sends what codex sent.
+/// Returns the frames the shim sent.
+async fn play<R: AsyncRead + Unpin, W: AsyncWrite + Unpin>(
+    t: &Transcript,
+    read: R,
+    mut write: W,
+) -> (Vec<Value>, R, W) {
+    let mut lines = BufReader::new(read).lines();
+    let mut ids: HashMap<String, Value> = HashMap::new();
+    let mut sent = Vec::new();
+    for (out, frame) in &t.frames {
+        if *out {
+            let line = tokio::time::timeout(Duration::from_secs(10), lines.next_line())
+                .await
+                .unwrap_or_else(|_| panic!("the shim didn't send {frame}"))
+                .unwrap()
+                .unwrap_or_else(|| panic!("the shim closed before {frame}"));
+            let actual: Value = serde_json::from_str(&line).unwrap();
+            match frame.get("method") {
+                Some(method) => {
+                    assert_eq!(actual.get("method"), Some(method), "expected {frame}, got {actual}");
+                    if let Some(id) = frame.get("id") {
+                        ids.insert(id.to_string(), actual["id"].clone());
+                    }
+                }
+                None => {
+                    assert_eq!(actual.get("id"), frame.get("id"), "expected {frame}, got {actual}");
+                    assert_eq!(actual.get("result"), frame.get("result"), "expected {frame}, got {actual}");
+                }
+            }
+            sent.push(actual);
+        } else {
+            let mut frame = frame.clone();
+            if frame.get("method").is_none()
+                && let Some(id) = frame.get("id").and_then(|id| ids.get(&id.to_string()))
+            {
+                frame["id"] = id.clone();
+            }
+            let mut line = serde_json::to_vec(&frame).unwrap();
+            line.push(b'\n');
+            write.write_all(&line).await.unwrap();
+        }
+    }
+    (sent, lines.into_inner().into_inner(), write)
+}
+
+/// Runs `scenario` against its transcript; returns the ACP results, the client and
+/// the frames the shim sent.
+async fn replay(scenario: Scenario) -> (Results, Arc<Client>, Vec<Value>, Value) {
+    let t = load(scenario.file());
+    let (ours, theirs) = tokio::io::duplex(1 << 20);
+    let (tr, tw) = tokio::io::split(theirs);
+    let client = Arc::new(Client::default());
+    let acp = attach(client.clone(), |events| {
+        let (or, ow) = tokio::io::split(ours);
+        Ok(Peer::connect_framed(or, ow, events, Framing::Lines))
+    })
+    .unwrap();
+    let meta = t.meta.clone();
+    let player = tokio::spawn(async move { play(&t, tr, tw).await });
+    let thread = meta["thread"].as_str();
+    let results = tokio::time::timeout(Duration::from_secs(20), drive(scenario, &acp, &client, "/work", thread))
+        .await
+        .expect("the scenario finished");
+    // Codex stays up until the scenario is over.
+    let (sent, _read, _write) = player.await.unwrap();
+    (results, client, sent, meta)
+}
+
+fn sent<'a>(frames: &'a [Value], method: &str) -> Vec<&'a Value> {
+    frames.iter().filter(|f| f["method"] == method).collect()
+}
+
+fn session_of(results: &Results, label: &str) -> String {
+    result(results, label).as_ref().unwrap()["sessionId"].as_str().unwrap().to_owned()
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn auth_failure_names_auth() {
+    let (results, _client, frames, _) = replay(Scenario::AuthFailure).await;
+    let init = result(&results, "initialize").as_ref().unwrap();
+    assert_eq!(init["agentCapabilities"]["loadSession"], true);
+    assert_eq!(init["agentCapabilities"]["_meta"]["openidea"], json!({"rollback": true, "steer": true}));
+    assert!(init["agentCapabilities"]["sessionCapabilities"]["fork"].is_object());
+    let new = result(&results, "new").as_ref().unwrap();
+    let categories: Vec<&str> =
+        new["configOptions"].as_array().unwrap().iter().map(|o| o["category"].as_str().unwrap()).collect();
+    // The model the user's codex config names; codex doesn't list it, so its efforts are unknown.
+    assert_eq!(categories, ["model", "mode"]);
+    let model = new["configOptions"][0]["currentValue"].as_str().unwrap();
+    assert_eq!(model, "gpt-6-luna");
+    assert!(new["configOptions"][0]["options"].as_array().unwrap().iter().any(|o| o["value"] == model));
+
+    match result(&results, "prompt") {
+        Err(RpcError::Server { code, message, .. }) => {
+            assert_eq!(*code, AUTH_REQUIRED);
+            assert!(message.to_lowercase().contains("auth"), "{message}");
+        }
+        r => panic!("expected an auth failure, got {r:?}"),
+    }
+    let start = sent(&frames, "turn/start")[0];
+    assert_eq!(start["params"]["model"], model);
+    assert!(start["params"]["approvalPolicy"].is_string() && start["params"]["sandboxPolicy"].is_object());
+    assert_eq!(start["params"]["input"], json!([{"type": "text", "text": "Reply with the single word: hi"}]));
+    assert!(start.get("jsonrpc").is_some(), "codex accepts the jsonrpc field");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_stop_sent_right_after_the_prompt_interrupts_the_turn() {
+    let (results, _client, frames, _) = replay(Scenario::Interrupt).await;
+    let options = result(&results, "mode").as_ref().unwrap()["configOptions"].as_array().unwrap().clone();
+    assert_eq!(options.iter().find(|o| o["id"] == MODE).unwrap()["currentValue"], "read-only");
+    assert_eq!(result(&results, "prompt").as_ref().unwrap(), &json!({"stopReason": "cancelled"}));
+    let start = sent(&frames, "turn/start")[0];
+    assert_eq!(
+        (start["params"]["approvalPolicy"].as_str(), &start["params"]["sandboxPolicy"]),
+        (Some("on-request"), &json!({"type": "readOnly"}))
+    );
+    let interrupt = sent(&frames, "turn/interrupt");
+    assert_eq!(interrupt.len(), 1);
+    assert!(interrupt[0]["params"]["turnId"].as_str().is_some_and(|t| !t.is_empty()));
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn resume_replays_history_then_forks_and_rolls_back() {
+    let (results, client, frames, meta) = replay(Scenario::Resume).await;
+    let thread = meta["thread"].as_str().unwrap();
+    assert!(result(&results, "load").as_ref().unwrap()["configOptions"].is_array());
+    assert_eq!(client.text(thread, "user_message_chunk"), meta["prompt"].as_str().unwrap());
+    let fork = session_of(&results, "fork");
+    assert_ne!(fork, thread);
+    assert_eq!(result(&results, "rollback").as_ref().unwrap(), &json!({}));
+    assert_eq!(sent(&frames, "thread/rollback")[0]["params"], json!({"threadId": thread, "numTurns": 1}));
+    assert_eq!(sent(&frames, "thread/unsubscribe")[0]["params"], json!({"threadId": thread}));
+}
+
+async fn rollback_replies(turns: u32, replies: Vec<(&str, Value)>) -> (Result<Value, RpcError>, Vec<Value>) {
+    let frames = replies
+        .into_iter()
+        .enumerate()
+        .flat_map(|(i, (method, mut reply))| {
+            let id = i + 1;
+            reply["id"] = json!(id);
+            [(true, json!({ "id": id, "method": method })), (false, reply)]
+        })
+        .collect();
+    let transcript = Transcript { meta: Value::Null, frames };
+    let (ours, theirs) = tokio::io::duplex(1 << 16);
+    let acp = attach(Arc::new(Client::default()), |events| {
+        let (read, write) = tokio::io::split(ours);
+        Ok(Peer::connect_framed(read, write, events, Framing::Lines))
+    })
+    .unwrap();
+    let (read, write) = tokio::io::split(theirs);
+    let player = tokio::spawn(async move { play(&transcript, read, write).await });
+    let result = request(&acp, "_openidea/rollback", json!({ "sessionId": "s", "turns": turns })).await;
+    let (sent, _read, _write) = player.await.unwrap();
+    acp.kill();
+    (result, sent)
+}
+
+fn removed_rollback() -> Value {
+    json!({ "error": { "code": -32600, "message": "Invalid request: unknown variant `thread/rollback`, expected one of `thread/revert`, `account/gatewayOAuth/read`, `getAuthStatus`" } })
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn removed_rollback_reverts_before_the_target_turn_across_pages() {
+    let (result, frames) = rollback_replies(
+        3,
+        vec![
+            ("thread/rollback", removed_rollback()),
+            (
+                "thread/turns/list",
+                json!({ "result": { "data": [{ "id": "last" }, { "id": "middle" }], "nextCursor": "older" } }),
+            ),
+            (
+                "thread/turns/list",
+                json!({ "result": { "data": [{ "id": "edited" }, { "id": "retained" }], "nextCursor": null } }),
+            ),
+            ("thread/revert", json!({ "result": { "thread": { "id": "s", "turns": [] } } })),
+        ],
+    )
+    .await;
+    assert_eq!(result.unwrap(), json!({}));
+    let pages = sent(&frames, "thread/turns/list");
+    assert_eq!(pages[0]["params"], json!({ "threadId": "s", "sortDirection": "desc", "limit": 3, "cursor": null }));
+    assert_eq!(pages[1]["params"]["cursor"], "older");
+    assert_eq!(pages[1]["params"]["limit"], 1);
+    assert_eq!(sent(&frames, "thread/revert")[0]["params"], json!({ "threadId": "s", "beforeTurnId": "edited" }));
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn method_not_found_reverts_the_latest_turn() {
+    let (result, frames) = rollback_replies(
+        1,
+        vec![
+            ("thread/rollback", json!({ "error": { "code": -32601, "message": "Method not found" } })),
+            ("thread/turns/list", json!({ "result": { "data": [{ "id": "last" }], "nextCursor": null } })),
+            ("thread/revert", json!({ "result": {} })),
+        ],
+    )
+    .await;
+    assert_eq!(result.unwrap(), json!({}));
+    assert_eq!(sent(&frames, "thread/revert")[0]["params"]["beforeTurnId"], "last");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn rollback_refusals_are_not_retried_as_revert() {
+    let (result, frames) = rollback_replies(
+        1,
+        vec![("thread/rollback", json!({ "error": { "code": -32600, "message": "a turn is still running" } }))],
+    )
+    .await;
+    assert!(result.unwrap_err().to_string().contains("a turn is still running"));
+    assert_eq!(frames.len(), 1);
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn incomplete_or_repeated_history_pages_do_not_revert_the_wrong_turn() {
+    for next in [Value::Null, json!("older")] {
+        let (result, frames) = rollback_replies(
+            3,
+            vec![
+                ("thread/rollback", removed_rollback()),
+                ("thread/turns/list", json!({ "result": { "data": [{ "id": "last" }], "nextCursor": "older" } })),
+                ("thread/turns/list", json!({ "result": { "data": [], "nextCursor": next } })),
+            ],
+        )
+        .await;
+        assert!(result.unwrap_err().to_string().contains("reload the task"));
+        assert!(sent(&frames, "thread/revert").is_empty());
+    }
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn steering_adds_to_the_running_turn() {
+    let (results, _client, frames, _) = replay(Scenario::Steer).await;
+    let steer = sent(&frames, "turn/steer");
+    assert_eq!(steer.len(), 1);
+    assert_eq!(steer[0]["params"]["input"], text("Count to three instead."));
+    assert_eq!(steer[0]["params"]["expectedTurnId"], sent(&frames, "turn/interrupt")[0]["params"]["turnId"]);
+    assert!(result(&results, "steer").is_ok(), "{:?}", result(&results, "steer"));
+    assert_eq!(result(&results, "prompt").as_ref().unwrap(), &json!({"stopReason": "cancelled"}));
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_simple_turn_streams_reasoning_text_and_usage() {
+    let (results, client, _frames, _) = replay(Scenario::Simple).await;
+    let session = session_of(&results, "new");
+    assert_eq!(result(&results, "prompt").as_ref().unwrap(), &json!({"stopReason": "end_turn"}));
+    assert_eq!(client.text(&session, "agent_thought_chunk"), "**Answering**\n\nShort reply.");
+    assert_eq!(client.text(&session, "agent_message_chunk"), "hi");
+    let kinds: Vec<String> =
+        client.of(&session).iter().map(|u| u["sessionUpdate"].as_str().unwrap().to_owned()).collect();
+    assert!(kinds.contains(&"usage_update".to_owned()));
+    let info = client.of(&session).into_iter().find(|u| u["sessionUpdate"] == "session_info_update").unwrap();
+    assert_eq!(info["title"], "Say hi");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn settings_apply_to_the_next_turn() {
+    let (results, client, frames, _) = replay(Scenario::MultiTurn).await;
+    let session = session_of(&results, "new");
+    assert_eq!(result(&results, "first").as_ref().unwrap(), &json!({"stopReason": "end_turn"}));
+    assert_eq!(result(&results, "second").as_ref().unwrap(), &json!({"stopReason": "end_turn"}));
+    let options = &result(&results, "effort").as_ref().unwrap()["configOptions"];
+    assert_eq!(
+        (options[0]["currentValue"].as_str(), options[1]["currentValue"].as_str()),
+        (Some("gpt-5.5"), Some("high"))
+    );
+    let starts = sent(&frames, "turn/start");
+    assert_eq!(
+        (starts[0]["params"]["model"].as_str(), starts[0]["params"]["effort"].as_str()),
+        (Some("gpt-5.6-luna"), Some("medium"))
+    );
+    assert_eq!(
+        (starts[1]["params"]["model"].as_str(), starts[1]["params"]["effort"].as_str()),
+        (Some("gpt-5.5"), Some("high"))
+    );
+    // Two messages of one turn are two paragraphs.
+    assert_eq!(client.text(&session, "agent_message_chunk"), "oneOn it.\n\ntwo");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn approvals_are_asked_and_answered() {
+    let (results, client, frames, _) = replay(Scenario::Approvals).await;
+    let session = session_of(&results, "new");
+    assert_eq!(result(&results, "prompt").as_ref().unwrap(), &json!({"stopReason": "end_turn"}));
+    let asked = client.asked.lock().clone();
+    assert_eq!(asked.len(), 2);
+    assert_eq!(asked[0]["toolCall"]["title"], "Run touch b.txt");
+    let ids: Vec<&str> =
+        asked[0]["options"].as_array().unwrap().iter().map(|o| o["optionId"].as_str().unwrap()).collect();
+    assert_eq!(ids, ["accept", "acceptWithExecpolicyAmendment", "decline", "cancel"]);
+    assert_eq!(asked[1]["toolCall"]["title"], "Create a.txt");
+    assert_eq!(asked[1]["toolCall"]["content"][0]["newText"], "one\n");
+    // Allowed once, then the cancelled one declined (the fixture checks the answers codex got).
+    let answers: Vec<&Value> = frames.iter().filter(|f| f.get("method").is_none()).map(|f| &f["result"]).collect();
+    assert_eq!(answers, [&json!({"decision": "accept"}), &json!({"decision": "decline"})]);
+
+    let updates = client.of(&session);
+    let tool = |id: &str| updates.iter().filter(|u| u["toolCallId"] == id).cloned().collect::<Vec<_>>();
+    let cmd = tool("call_cmd");
+    assert_eq!(cmd[0]["sessionUpdate"], "tool_call");
+    assert!(cmd.iter().any(|u| u.pointer("/content/0/content/text") == Some(&json!("touched\n"))));
+    assert_eq!(cmd.last().unwrap()["status"], "completed");
+    let edit = tool("call_edit");
+    assert_eq!(edit.last().unwrap()["status"], "failed");
+    let plan = updates.iter().find(|u| u["sessionUpdate"] == "plan").unwrap();
+    assert_eq!(plan["entries"][0]["status"], "completed");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn usage_limits_fail_with_their_reset_time() {
+    let (results, _client, _frames, _) = replay(Scenario::UsageLimit).await;
+    match result(&results, "prompt") {
+        Err(RpcError::Server { message, data, .. }) => {
+            assert!(message.contains("usage limit"), "{message}");
+            assert_eq!(data, &Some(json!({"openidea": {"usageLimit": {"resetsAtMs": 1_793_200_000_000.0}}})));
+        }
+        r => panic!("expected a usage limit, got {r:?}"),
+    }
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn subagents_are_sessions_of_their_own() {
+    let (results, client, _frames, meta) = replay(Scenario::Subagent).await;
+    let session = session_of(&results, "new");
+    let child = meta["child"].as_str().unwrap();
+    assert_eq!(result(&results, "prompt").as_ref().unwrap(), &json!({"stopReason": "end_turn"}));
+    let parent = client.of(&session);
+    let cards: Vec<&Value> = parent.iter().filter(|u| u["sessionUpdate"] == "subagent_update").collect();
+    assert_eq!(cards[0]["sessionId"], child);
+    assert_eq!(cards[0]["title"], "say_hello");
+    assert_eq!(cards.last().unwrap()["state"], json!({"state": "idle", "stopReason": "end_turn"}));
+    let messages: Vec<&Value> = parent.iter().filter(|u| u["sessionUpdate"] == "session_message").collect();
+    assert_eq!(
+        (messages[0]["recipientSessionId"].as_str(), messages[0]["content"][0]["text"].as_str()),
+        (Some(child), Some("Reply with: Hello"))
+    );
+    assert_eq!(
+        (messages[1]["senderSessionId"].as_str(), messages[1]["content"][0]["text"].as_str()),
+        (Some(child), Some("Hello."))
+    );
+    assert_eq!(client.text(child, "agent_message_chunk"), "Hello.");
+    assert_eq!(client.text(&session, "agent_message_chunk"), "Hello.");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn the_client_going_away_stops_codex_and_codex_exiting_closes_the_client() {
+    let (ours, theirs) = tokio::io::duplex(1 << 16);
+    let codex_side = Arc::new(Mutex::new(None::<Peer>));
+    let acp = attach(Arc::new(Client::default()), |events| {
+        let (or, ow) = tokio::io::split(ours);
+        let peer = Peer::connect_framed(or, ow, events, Framing::Lines);
+        *codex_side.lock() = Some(peer.clone());
+        Ok(peer)
+    })
+    .unwrap();
+    let codex = codex_side.lock().clone().unwrap();
+    acp.kill();
+    tokio::time::timeout(Duration::from_secs(5), codex.closed()).await.expect("codex is stopped");
+    drop(theirs);
+
+    let (ours, theirs) = tokio::io::duplex(1 << 16);
+    let acp = attach(Arc::new(Client::default()), |events| {
+        let (or, ow) = tokio::io::split(ours);
+        Ok(Peer::connect_framed(or, ow, events, Framing::Lines))
+    })
+    .unwrap();
+    drop(theirs);
+    tokio::time::timeout(Duration::from_secs(5), acp.closed()).await.expect("the client sees codex exit");
+}
+
+// ---- Recording -------------------------------------------------------------------------
+
+/// Records the scenarios codex can run here against the real `codex app-server`:
+/// `cargo test -p ide-agent record_codex_fixtures -- --ignored --nocapture`.
+#[tokio::test(flavor = "multi_thread")]
+#[ignore = "runs the real codex"]
+async fn record_codex_fixtures() {
+    let only = std::env::var("CODEX_SCENARIO").ok();
+    let version = std::process::Command::new("codex").arg("--version").output().unwrap();
+    let version = String::from_utf8_lossy(&version.stdout).trim().to_owned();
+    for scenario in [Scenario::AuthFailure, Scenario::Interrupt, Scenario::Steer, Scenario::Resume] {
+        if only.as_deref().is_some_and(|o| o != scenario.file()) {
+            continue;
+        }
+        let dir = tempfile::tempdir().unwrap();
+        let cwd = dir.path().canonicalize().unwrap();
+        let cwd_s = cwd.to_string_lossy().into_owned();
+        let mut meta =
+            json!({ "type": "meta", "scenario": scenario.file(), "source": format!("recorded from {version}") });
+        let thread = if scenario == Scenario::Resume {
+            // A thread with one (stopped) turn, made by another codex process.
+            let prompt = "Count to five.";
+            let (client, acp, _log) = live(&cwd);
+            request(&acp, "initialize", json!({ "protocolVersion": 1 })).await.unwrap();
+            let new = request(&acp, "session/new", json!({ "cwd": cwd_s, "mcpServers": [] })).await.unwrap();
+            let id = new["sessionId"].as_str().unwrap().to_owned();
+            let running = {
+                let (acp, p) = (acp.clone(), json!({ "sessionId": id, "prompt": text(prompt) }));
+                tokio::spawn(async move { request(&acp, "session/prompt", p).await })
+            };
+            tokio::time::sleep(Duration::from_secs(2)).await;
+            acp.notify("session/cancel", json!({ "sessionId": id })).unwrap();
+            let _ = running.await;
+            drop(client);
+            acp.kill();
+            meta["thread"] = json!(id);
+            meta["prompt"] = json!(prompt);
+            Some(id)
+        } else {
+            None
+        };
+        let (client, acp, log) = live(&cwd);
+        let results = drive(scenario, &acp, &client, &cwd_s, thread.as_deref()).await;
+        println!(
+            "{}: {:?}",
+            scenario.file(),
+            results.iter().map(|(l, r)| (l, r.as_ref().map(|_| ()))).collect::<Vec<_>>()
+        );
+        tokio::time::sleep(Duration::from_millis(300)).await;
+        acp.kill();
+        let home = std::env::var("HOME").unwrap_or_default();
+        let mut out = serde_json::to_string(&meta).unwrap() + "\n";
+        for line in log.lock().iter() {
+            out.push_str(&scrub(line, &[(&cwd_s, "<workspace>"), (&home, "<home>")]));
+            out.push('\n');
+        }
+        std::fs::write(fixture_dir().join(format!("{}.jsonl", scenario.file())), out).unwrap();
+        let fork = results.iter().find(|(l, _)| *l == "fork").and_then(|(_, r)| r.as_ref().ok());
+        if let Some(fork) = fork.and_then(|f| f["sessionId"].as_str()) {
+            // A fork is loaded by a fresh process.
+            let (client, acp, _log) = live(&cwd);
+            request(&acp, "initialize", json!({ "protocolVersion": 1 })).await.unwrap();
+            let loaded =
+                request(&acp, "session/load", json!({ "sessionId": fork, "cwd": cwd_s, "mcpServers": [] })).await;
+            println!("fork {fork} loaded from a fresh process: {:?}", loaded.map(|_| client.of(fork).len()));
+            acp.kill();
+        }
+    }
+}
+
+/// The shim over a real codex, with a tap writing each frame to the returned log.
+fn live(cwd: &Path) -> (Arc<Client>, Peer, Arc<Mutex<Vec<String>>>) {
+    let log = Arc::new(Mutex::new(Vec::new()));
+    let client = Arc::new(Client::default());
+    let cwd = cwd.to_path_buf();
+    let tap = log.clone();
+    let acp = attach(client.clone(), move |events| {
+        let mut child = tokio::process::Command::new("codex")
+            .arg("app-server")
+            .current_dir(&cwd)
+            .stdin(std::process::Stdio::piped())
+            .stdout(std::process::Stdio::piped())
+            .stderr(std::process::Stdio::null())
+            .kill_on_drop(true)
+            .spawn()?;
+        let (mut stdin, stdout) = (child.stdin.take().unwrap(), child.stdout.take().unwrap());
+        let (ours, theirs) = tokio::io::duplex(1 << 20);
+        let (tr, mut tw) = tokio::io::split(theirs);
+        let out_log = tap.clone();
+        tokio::spawn(async move {
+            let mut lines = BufReader::new(tr).lines();
+            while let Ok(Some(line)) = lines.next_line().await {
+                out_log.lock().push(format!("{{\"dir\":\"out\",\"frame\":{line}}}"));
+                if stdin.write_all(format!("{line}\n").as_bytes()).await.is_err() {
+                    break;
+                }
+            }
+            let _ = child.kill().await;
+        });
+        tokio::spawn(async move {
+            let mut lines = BufReader::new(stdout).lines();
+            while let Ok(Some(line)) = lines.next_line().await {
+                tap.lock().push(format!("{{\"dir\":\"in\",\"frame\":{line}}}"));
+                if tw.write_all(format!("{line}\n").as_bytes()).await.is_err() {
+                    break;
+                }
+            }
+        });
+        let (or, ow) = tokio::io::split(ours);
+        Ok(Peer::connect_framed(or, ow, events, Framing::Lines))
+    })
+    .unwrap();
+    (client, acp, log)
+}
+
+/// A transcript line without local paths or machine identifiers.
+fn scrub(line: &str, paths: &[(&str, &str)]) -> String {
+    let mut v: Value = serde_json::from_str(line).unwrap();
+    if let Some(p) = v.pointer_mut("/frame/params").and_then(Value::as_object_mut)
+        && v_method(line) == Some("remoteControl/status/changed")
+    {
+        p.insert("serverName".into(), json!("<host>"));
+        p.insert("installationId".into(), json!("<installation>"));
+    }
+    let mut s = v.to_string();
+    for (from, to) in paths {
+        if !from.is_empty() {
+            s = s.replace(from, to);
+        }
+    }
+    s
+}
+
+fn v_method(line: &str) -> Option<&str> {
+    let at = line.find("\"method\":\"")? + 10;
+    line[at..].split('"').next()
+}

crates/ide-agent/src/native/codex/translate.rs

@@ -0,0 +1,837 @@
+//! Pure translations between `codex app-server` (v2) messages and ACP.
+
+use serde_json::{Map, Value, json};
+
+/// Tool output sent per update; longer output keeps its tail (the timeline keeps no more).
+pub(super) const MAX_OUTPUT: usize = 64 * 1024;
+
+/// Approval and sandbox presets, offered as the session's mode.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub(super) enum Mode {
+    ReadOnly,
+    Ask,
+    Auto,
+    FullAccess,
+}
+
+impl Mode {
+    pub const ALL: [Mode; 4] = [Mode::ReadOnly, Mode::Ask, Mode::Auto, Mode::FullAccess];
+
+    pub fn id(self) -> &'static str {
+        match self {
+            Mode::ReadOnly => "read-only",
+            Mode::Ask => "ask",
+            Mode::Auto => "auto",
+            Mode::FullAccess => "full-access",
+        }
+    }
+
+    fn name(self) -> &'static str {
+        match self {
+            Mode::ReadOnly => "Read Only",
+            Mode::Ask => "Ask",
+            Mode::Auto => "Auto",
+            Mode::FullAccess => "Full Access",
+        }
+    }
+
+    fn description(self) -> &'static str {
+        match self {
+            Mode::ReadOnly => "Reads files; asks before editing or running anything that writes",
+            Mode::Ask => "Edits in the workspace; asks before running commands it doesn't trust",
+            Mode::Auto => "Edits and runs commands in the workspace; asks to go beyond it",
+            Mode::FullAccess => "Edits and runs anything, with network access, without asking",
+        }
+    }
+
+    pub fn parse(id: &str) -> Option<Mode> {
+        Mode::ALL.into_iter().find(|m| m.id() == id)
+    }
+
+    /// `approvalPolicy` (`AskForApproval`).
+    pub fn approval_policy(self) -> &'static str {
+        match self {
+            Mode::ReadOnly | Mode::Auto => "on-request",
+            Mode::Ask => "untrusted",
+            Mode::FullAccess => "never",
+        }
+    }
+
+    /// `sandbox` of `thread/start`, `thread/resume` and `thread/fork` (`SandboxMode`).
+    pub fn sandbox_mode(self) -> &'static str {
+        match self {
+            Mode::ReadOnly => "read-only",
+            Mode::Ask | Mode::Auto => "workspace-write",
+            Mode::FullAccess => "danger-full-access",
+        }
+    }
+
+    /// `sandboxPolicy` of `turn/start` (`SandboxPolicy`).
+    pub fn sandbox_policy(self) -> Value {
+        match self {
+            Mode::ReadOnly => json!({ "type": "readOnly" }),
+            Mode::Ask | Mode::Auto => json!({ "type": "workspaceWrite" }),
+            Mode::FullAccess => json!({ "type": "dangerFullAccess" }),
+        }
+    }
+
+    /// The preset closest to what a thread runs with (`approvalPolicy`, `sandbox` policy).
+    pub fn of(approval: &Value, sandbox: &Value) -> Mode {
+        match sandbox.get("type").and_then(Value::as_str) {
+            Some("readOnly") => Mode::ReadOnly,
+            Some("dangerFullAccess" | "externalSandbox") => Mode::FullAccess,
+            _ if approval.as_str() == Some("untrusted") => Mode::Ask,
+            _ => Mode::Auto,
+        }
+    }
+}
+
+/// A model `model/list` offers.
+#[derive(Clone, Debug, PartialEq)]
+pub(super) struct ModelInfo {
+    pub id: String,
+    /// The slug sent as `model`.
+    pub model: String,
+    pub name: String,
+    pub description: Option<String>,
+    /// `(effort, description)`.
+    pub efforts: Vec<(String, String)>,
+    pub default_effort: Option<String>,
+    pub is_default: bool,
+    pub hidden: bool,
+}
+
+pub(super) fn models_of(list: &Value) -> Vec<ModelInfo> {
+    let data = list.get("data").and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+    data.iter()
+        .filter_map(|m| {
+            let id = m.get("id")?.as_str()?.to_owned();
+            Some(ModelInfo {
+                model: str_of(m, "model").unwrap_or_else(|| id.clone()),
+                name: str_of(m, "displayName").filter(|n| !n.is_empty()).unwrap_or_else(|| id.clone()),
+                description: str_of(m, "description").filter(|d| !d.is_empty()),
+                efforts: m
+                    .get("supportedReasoningEfforts")
+                    .and_then(Value::as_array)
+                    .into_iter()
+                    .flatten()
+                    .filter_map(|e| {
+                        Some((
+                            e.get("reasoningEffort")?.as_str()?.to_owned(),
+                            str_of(e, "description").unwrap_or_default(),
+                        ))
+                    })
+                    .collect(),
+                default_effort: str_of(m, "defaultReasoningEffort"),
+                is_default: m.get("isDefault").and_then(Value::as_bool) == Some(true),
+                hidden: m.get("hidden").and_then(Value::as_bool) == Some(true),
+                id,
+            })
+        })
+        .collect()
+}
+
+/// What a session runs with; sent with every turn.
+#[derive(Clone, Debug, PartialEq)]
+pub(super) struct Settings {
+    /// A model id from `model/list`, or the one the thread reported.
+    pub model: String,
+    pub effort: Option<String>,
+    pub mode: Mode,
+}
+
+impl Settings {
+    /// From a `thread/start`, `thread/resume` or `thread/fork` result.
+    pub fn of(result: &Value, models: &[ModelInfo]) -> Settings {
+        let reported = str_of(result, "model").unwrap_or_default();
+        let model = models
+            .iter()
+            .find(|m| m.model == reported || m.id == reported)
+            .or_else(|| reported.is_empty().then(|| models.iter().find(|m| m.is_default)).flatten())
+            .map_or(reported, |m| m.id.clone());
+        let mut s = Settings {
+            model,
+            effort: str_of(result, "reasoningEffort"),
+            mode: Mode::of(
+                result.get("approvalPolicy").unwrap_or(&Value::Null),
+                result.get("sandbox").unwrap_or(&Value::Null),
+            ),
+        };
+        s.fit_effort(models);
+        s
+    }
+
+    /// The effort, made one the model supports (its default when it isn't).
+    pub fn fit_effort(&mut self, models: &[ModelInfo]) {
+        let Some(m) = models.iter().find(|m| m.id == self.model) else { return };
+        if m.efforts.is_empty() {
+            self.effort = None;
+        } else if !self.effort.as_ref().is_some_and(|e| m.efforts.iter().any(|(x, _)| x == e)) {
+            self.effort = m.default_effort.clone().or_else(|| m.efforts.first().map(|(e, _)| e.clone()));
+        }
+    }
+
+    /// The slug to send as `model`.
+    pub fn model_slug(&self, models: &[ModelInfo]) -> String {
+        models.iter().find(|m| m.id == self.model).map_or_else(|| self.model.clone(), |m| m.model.clone())
+    }
+
+    /// Applies `session/set_config_option`; `Err` names what is wrong.
+    pub fn set(&mut self, models: &[ModelInfo], option: &str, value: &str) -> Result<(), String> {
+        match option {
+            MODEL => {
+                if !models.iter().any(|m| m.id == value) && value != self.model {
+                    return Err(format!("unknown model {value}"));
+                }
+                self.model = value.to_owned();
+                self.fit_effort(models);
+            }
+            EFFORT => {
+                let m = models.iter().find(|m| m.id == self.model);
+                if !m.is_some_and(|m| m.efforts.iter().any(|(e, _)| e == value)) {
+                    return Err(format!("{} has no reasoning effort {value}", self.model));
+                }
+                self.effort = Some(value.to_owned());
+            }
+            MODE => self.mode = Mode::parse(value).ok_or_else(|| format!("unknown mode {value}"))?,
+            _ => return Err(format!("unknown setting {option}")),
+        }
+        Ok(())
+    }
+}
+
+pub(super) const MODEL: &str = "model";
+pub(super) const EFFORT: &str = "reasoning_effort";
+pub(super) const MODE: &str = "mode";
+
+/// ACP `configOptions`: model, reasoning effort (for models that have it) and mode.
+pub(super) fn config_options(models: &[ModelInfo], s: &Settings) -> Value {
+    let mut model_values: Vec<Value> = models
+        .iter()
+        .filter(|m| !m.hidden || m.id == s.model)
+        .map(|m| select_value(&m.id, &m.name, m.description.as_deref()))
+        .collect();
+    if !s.model.is_empty() && !models.iter().any(|m| m.id == s.model) {
+        model_values.push(select_value(&s.model, &s.model, None));
+    }
+    let mut out = vec![json!({
+        "id": MODEL, "name": "Model", "category": "model", "type": "select",
+        "currentValue": s.model, "options": model_values,
+    })];
+    if let (Some(m), Some(effort)) = (models.iter().find(|m| m.id == s.model), &s.effort)
+        && !m.efforts.is_empty()
+    {
+        let values: Vec<Value> = m
+            .efforts
+            .iter()
+            .map(|(e, d)| select_value(e, &effort_name(e), Some(d).filter(|d| !d.is_empty()).map(String::as_str)))
+            .collect();
+        out.push(json!({
+            "id": EFFORT, "name": "Reasoning", "category": "thought_level", "type": "select",
+            "currentValue": effort, "options": values,
+        }));
+    }
+    out.push(json!({
+        "id": MODE, "name": "Mode", "category": "mode", "type": "select", "currentValue": s.mode.id(),
+        "options": Mode::ALL.iter().map(|m| select_value(m.id(), m.name(), Some(m.description()))).collect::<Vec<_>>(),
+    }));
+    Value::Array(out)
+}
+
+fn select_value(value: &str, name: &str, description: Option<&str>) -> Value {
+    let mut v = json!({ "value": value, "name": name });
+    if let Some(d) = description {
+        v["description"] = json!(d);
+    }
+    v
+}
+
+fn effort_name(effort: &str) -> String {
+    match effort {
+        "xhigh" => "Extra high".into(),
+        e => {
+            let mut c = e.chars();
+            c.next().map(|f| f.to_uppercase().chain(c).collect()).unwrap_or_default()
+        }
+    }
+}
+
+/// ACP prompt content blocks as codex `UserInput`s. Embedded files become text.
+pub(super) fn user_input(prompt: &Value) -> Vec<Value> {
+    let blocks = prompt.as_array().map(Vec::as_slice).unwrap_or_default();
+    blocks
+        .iter()
+        .filter_map(|b| match b.get("type").and_then(Value::as_str)? {
+            "text" => Some(json!({ "type": "text", "text": b.get("text")?.as_str()? })),
+            "image" => {
+                let url = match (b.get("data").and_then(Value::as_str), b.get("uri").and_then(Value::as_str)) {
+                    (Some(data), _) => {
+                        format!(
+                            "data:{};base64,{data}",
+                            b.get("mimeType").and_then(Value::as_str).unwrap_or("image/png")
+                        )
+                    }
+                    (None, Some(uri)) => uri.to_owned(),
+                    _ => return None,
+                };
+                Some(json!({ "type": "image", "url": url }))
+            }
+            "resource" => {
+                let r = b.get("resource")?;
+                let path = uri_path(r.get("uri").and_then(Value::as_str).unwrap_or_default());
+                let text = r.get("text").and_then(Value::as_str)?;
+                Some(json!({ "type": "text", "text": format!("<file path=\"{path}\">\n{text}\n</file>") }))
+            }
+            "resource_link" => Some(json!({ "type": "text", "text": uri_path(b.get("uri")?.as_str()?) })),
+            _ => None,
+        })
+        .collect()
+}
+
+/// The path of a `file://` URI (percent-decoded); other URIs as they are.
+fn uri_path(uri: &str) -> String {
+    let Some(rest) = uri.strip_prefix("file://") else { return uri.to_owned() };
+    let bytes = rest.as_bytes();
+    let mut out = Vec::with_capacity(bytes.len());
+    let mut i = 0;
+    while i < bytes.len() {
+        if bytes[i] == b'%'
+            && let Some(b) = rest.get(i + 1..i + 3).and_then(|h| u8::from_str_radix(h, 16).ok())
+        {
+            out.push(b);
+            i += 3;
+        } else {
+            out.push(bytes[i]);
+            i += 1;
+        }
+    }
+    String::from_utf8_lossy(&out).into_owned()
+}
+
+/// A `session/update` notification's `update` for content.
+pub(super) fn chunk(kind: &str, text: &str) -> Value {
+    json!({ "sessionUpdate": kind, "content": { "type": "text", "text": text } })
+}
+
+/// ACP tool status of a codex item `status`; items without one are running until they complete.
+fn tool_status(item: &Value, done: bool) -> &'static str {
+    match item.get("status").and_then(Value::as_str) {
+        Some("completed") => "completed",
+        Some("failed" | "declined") => "failed",
+        Some(_) => "in_progress",
+        None if done => "completed",
+        None => "in_progress",
+    }
+}
+
+/// The `tool_call` (or with `done`, the `tool_call_update`) for a tool-like item; `None`
+/// for messages, reasoning and subagent bookkeeping. `output` is the command output
+/// streamed so far, used when the item carries none.
+pub(super) fn tool_call(item: &Value, done: bool, cwd: Option<&str>, output: Option<&str>) -> Option<Value> {
+    let id = item.get("id")?.as_str()?;
+    let ty = item.get("type")?.as_str()?;
+    let mut call = Map::new();
+    let (title, kind) = match ty {
+        "commandExecution" => {
+            let (title, kind, locations) = command_title(item, cwd);
+            call.insert("rawInput".into(), json!({ "command": item.get("command"), "cwd": item.get("cwd") }));
+            if !locations.is_empty() {
+                call.insert("locations".into(), Value::Array(locations));
+            }
+            let text = item.get("aggregatedOutput").and_then(Value::as_str).or(output);
+            if let Some(text) = text.filter(|t| !t.is_empty()) {
+                call.insert("content".into(), json!([text_content(&tail(text))]));
+            }
+            if done && let Some(code) = item.get("exitCode").filter(|c| !c.is_null()) {
+                call.insert("rawOutput".into(), json!({ "exitCode": code }));
+            }
+            (title, kind)
+        }
+        "fileChange" => {
+            let changes = item.get("changes").and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+            let diffs: Vec<Value> = changes.iter().filter_map(file_diff).collect();
+            let locations: Vec<Value> =
+                diffs.iter().filter_map(|d| d.get("path")).map(|p| json!({ "path": p })).collect();
+            call.insert("locations".into(), Value::Array(locations));
+            if !diffs.is_empty() {
+                call.insert("content".into(), Value::Array(diffs));
+            }
+            file_change_title(changes, cwd)
+        }
+        "mcpToolCall" => {
+            call.insert("rawInput".into(), item.get("arguments").cloned().unwrap_or(Value::Null));
+            let mut content: Vec<Value> = item
+                .pointer("/result/content")
+                .and_then(Value::as_array)
+                .into_iter()
+                .flatten()
+                .filter(|c| c.get("type").is_some())
+                .map(|c| json!({ "type": "content", "content": c }))
+                .collect();
+            if let Some(message) = item.pointer("/error/message").and_then(Value::as_str) {
+                content.push(text_content(message));
+            }
+            if !content.is_empty() {
+                call.insert("content".into(), Value::Array(content));
+            }
+            let server = item.get("server").and_then(Value::as_str).unwrap_or_default();
+            let tool = item.get("tool").and_then(Value::as_str).unwrap_or_default();
+            (format!("{server}: {tool}"), "other")
+        }
+        "dynamicToolCall" => {
+            call.insert("rawInput".into(), item.get("arguments").cloned().unwrap_or(Value::Null));
+            let content: Vec<Value> = item
+                .get("contentItems")
+                .and_then(Value::as_array)
+                .into_iter()
+                .flatten()
+                .filter_map(|c| c.get("text").and_then(Value::as_str))
+                .map(text_content)
+                .collect();
+            if !content.is_empty() {
+                call.insert("content".into(), Value::Array(content));
+            }
+            (str_of(item, "tool").unwrap_or_default(), "other")
+        }
+        "webSearch" => (web_search_title(item), "fetch"),
+        "imageView" => {
+            let path = item.get("path").and_then(Value::as_str).unwrap_or_default();
+            call.insert("locations".into(), json!([{ "path": path }]));
+            (format!("View {}", display_path(path, cwd)), "read")
+        }
+        "collabAgentToolCall" => {
+            let title = match item.get("tool").and_then(Value::as_str) {
+                Some("spawnAgent") => return None,
+                Some("sendInput") => "Message an agent",
+                Some("resumeAgent") => "Resume an agent",
+                Some("wait") => "Wait for agents",
+                Some("closeAgent") => "Close an agent",
+                _ => "Coordinate agents",
+            };
+            (title.to_owned(), "other")
+        }
+        "contextCompaction" => ("Compact the conversation".to_owned(), "other"),
+        "sleep" => ("Wait".to_owned(), "other"),
+        "imageGeneration" => ("Generate an image".to_owned(), "other"),
+        _ => return None,
+    };
+    call.insert("sessionUpdate".into(), json!(if done { "tool_call_update" } else { "tool_call" }));
+    call.insert("toolCallId".into(), json!(id));
+    call.insert("title".into(), json!(title));
+    call.insert("kind".into(), json!(kind));
+    call.insert("status".into(), json!(tool_status(item, done)));
+    Some(Value::Object(call))
+}
+
+/// The output of a running command, as a `tool_call_update`.
+pub(super) fn command_output(id: &str, output: &str) -> Value {
+    json!({ "sessionUpdate": "tool_call_update", "toolCallId": id, "content": [text_content(&tail(output))] })
+}
+
+fn text_content(text: &str) -> Value {
+    json!({ "type": "content", "content": { "type": "text", "text": text } })
+}
+
+/// Title, ACP kind and locations of a command: what it does when codex recognised it
+/// (reading, listing, searching), else the command itself.
+fn command_title(item: &Value, cwd: Option<&str>) -> (String, &'static str, Vec<Value>) {
+    let actions = item.get("commandActions").and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+    let ty = |a: &Value| a.get("type").and_then(Value::as_str).unwrap_or("unknown").to_owned();
+    let all = |t: &str| !actions.is_empty() && actions.iter().all(|a| ty(a) == t);
+    if all("read") {
+        let names: Vec<String> = actions.iter().filter_map(|a| str_of(a, "name")).collect();
+        let locations = actions.iter().filter_map(|a| a.get("path")).map(|p| json!({ "path": p })).collect();
+        return (format!("Read {}", names.join(", ")), "read", locations);
+    }
+    if all("listFiles") {
+        let path =
+            actions[0].get("path").and_then(Value::as_str).map_or_else(|| ".".to_owned(), |p| display_path(p, cwd));
+        return (format!("List {path}"), "search", Vec::new());
+    }
+    if all("search") && actions.len() == 1 {
+        let a = &actions[0];
+        let query = a.get("query").and_then(Value::as_str);
+        let path = a.get("path").and_then(Value::as_str).map(|p| display_path(p, cwd));
+        let title = match (query, path) {
+            (Some(q), Some(p)) => format!("Search {q} in {p}"),
+            (Some(q), None) => format!("Search {q}"),
+            (None, Some(p)) => format!("Search in {p}"),
+            (None, None) => "Search".to_owned(),
+        };
+        return (title, "search", Vec::new());
+    }
+    // The command as the model wrote it, without the shell wrapper codex adds.
+    let command = match actions {
+        [one] => one.get("command").and_then(Value::as_str),
+        _ => None,
+    };
+    let command = command.or_else(|| item.get("command").and_then(Value::as_str)).unwrap_or_default();
+    (command.to_owned(), "execute", Vec::new())
+}
+
+fn file_change_title(changes: &[Value], cwd: Option<&str>) -> (String, &'static str) {
+    let kind_of = |c: &Value| c.pointer("/kind/type").and_then(Value::as_str).unwrap_or("update").to_owned();
+    let moved = |c: &Value| c.pointer("/kind/move_path").and_then(Value::as_str).map(str::to_owned);
+    match changes {
+        [one] => {
+            let path = display_path(one.get("path").and_then(Value::as_str).unwrap_or_default(), cwd);
+            match (kind_of(one).as_str(), moved(one)) {
+                ("add", _) => (format!("Create {path}"), "edit"),
+                ("delete", _) => (format!("Delete {path}"), "delete"),
+                (_, Some(to)) => (format!("Move {path} to {}", display_path(&to, cwd)), "move"),
+                _ => (format!("Edit {path}"), "edit"),
+            }
+        }
+        _ if !changes.is_empty() && changes.iter().all(|c| kind_of(c) == "delete") => {
+            (format!("Delete {} files", changes.len()), "delete")
+        }
+        _ => (format!("Edit {} files", changes.len()), "edit"),
+    }
+}
+
+/// An ACP `diff` content item for a `FileUpdateChange`: a new file's `diff` is its
+/// content, a deleted one's its old content, an update's a unified diff.
+fn file_diff(change: &Value) -> Option<Value> {
+    let path = change.get("path")?.as_str()?;
+    let diff = change.get("diff").and_then(Value::as_str).unwrap_or_default();
+    let (path, old, new) = match change.pointer("/kind/type").and_then(Value::as_str) {
+        Some("add") => (path, String::new(), diff.to_owned()),
+        Some("delete") => (path, diff.to_owned(), String::new()),
+        _ => {
+            let (old, new) = diff_sides(diff);
+            (change.pointer("/kind/move_path").and_then(Value::as_str).unwrap_or(path), old, new)
+        }
+    };
+    Some(json!({ "type": "diff", "path": path, "oldText": old, "newText": new }))
+}
+
+/// The old and new text a unified diff's hunks cover (context included).
+pub(super) fn diff_sides(diff: &str) -> (String, String) {
+    let (mut old, mut new) = (String::new(), String::new());
+    let mut in_hunk = false;
+    for line in diff.split_inclusive('\n') {
+        if line.starts_with("@@") {
+            in_hunk = true;
+            continue;
+        }
+        if !in_hunk {
+            continue;
+        }
+        match line.as_bytes().first() {
+            Some(b' ') => {
+                old.push_str(&line[1..]);
+                new.push_str(&line[1..]);
+            }
+            Some(b'-') => old.push_str(&line[1..]),
+            Some(b'+') => new.push_str(&line[1..]),
+            // `\ No newline at end of file`, or the next file's header.
+            Some(b'\\') => {}
+            Some(b'\n') => {
+                old.push('\n');
+                new.push('\n');
+            }
+            _ => in_hunk = false,
+        }
+    }
+    (old, new)
+}
+
+fn web_search_title(item: &Value) -> String {
+    let action = item.get("action");
+    let field = |k: &str| action.and_then(|a| a.get(k)).and_then(Value::as_str).filter(|s| !s.is_empty());
+    let query = item.get("query").and_then(Value::as_str).filter(|q| !q.is_empty());
+    match action.and_then(|a| a.get("type")).and_then(Value::as_str) {
+        Some("openPage") => field("url").map_or_else(|| "Open a page".to_owned(), |u| format!("Open {u}")),
+        Some("findInPage") => match field("pattern") {
+            Some(p) => format!("Find {p}"),
+            None => "Find in page".to_owned(),
+        },
+        _ => field("query").or(query).map_or_else(|| "Search the web".to_owned(), |q| format!("Search the web: {q}")),
+    }
+}
+
+/// `path` relative to `cwd` when it is inside it.
+fn display_path(path: &str, cwd: Option<&str>) -> String {
+    cwd.and_then(|c| path.strip_prefix(c.trim_end_matches('/')))
+        .and_then(|rest| rest.strip_prefix('/'))
+        .filter(|r| !r.is_empty())
+        .unwrap_or(path)
+        .to_owned()
+}
+
+/// `turn/plan/updated` as an ACP `plan`.
+pub(super) fn plan(params: &Value) -> Value {
+    let entries: Vec<Value> = params
+        .get("plan")
+        .and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .map(|s| {
+            let status = match s.get("status").and_then(Value::as_str) {
+                Some("completed") => "completed",
+                Some("inProgress") => "in_progress",
+                _ => "pending",
+            };
+            json!({ "content": s.get("step").and_then(Value::as_str).unwrap_or_default(), "priority": "medium", "status": status })
+        })
+        .collect();
+    json!({ "sessionUpdate": "plan", "entries": entries })
+}
+
+/// `thread/tokenUsage/updated` as an ACP `usage_update`: what the last request put in
+/// the context window, out of its size.
+pub(super) fn usage(params: &Value) -> Option<Value> {
+    let usage = params.get("tokenUsage")?;
+    let used = usage.pointer("/last/totalTokens")?.as_u64()?;
+    let size = usage.get("modelContextWindow")?.as_u64().filter(|s| *s > 0)?;
+    Some(json!({ "sessionUpdate": "usage_update", "used": used, "size": size }))
+}
+
+/// How a failed turn is reported.
+#[derive(Debug, PartialEq)]
+pub(super) enum Failure {
+    /// The account's usage limit; when it resets (ms since the epoch), when known.
+    UsageLimit(Option<f64>),
+    /// Signed out or refused.
+    Auth,
+    /// The model declined.
+    Refusal,
+    Other,
+}
+
+/// What kind of failure a `TurnError` is; `rate_limits` is the last
+/// `account/rateLimits/updated` snapshot.
+pub(super) fn classify(error: &Value, rate_limits: Option<&Value>) -> Failure {
+    let info = error.get("codexErrorInfo").unwrap_or(&Value::Null);
+    let http_status =
+        info.as_object().and_then(|o| o.values().next()).and_then(|v| v.get("httpStatusCode")).and_then(Value::as_u64);
+    let message = error.get("message").and_then(Value::as_str).unwrap_or_default().to_lowercase();
+    match info.as_str() {
+        Some("usageLimitExceeded") => return Failure::UsageLimit(resets_at(rate_limits)),
+        Some("unauthorized") => return Failure::Auth,
+        Some("cyberPolicy") => return Failure::Refusal,
+        _ => {}
+    }
+    if http_status == Some(429) && info.get("responseTooManyFailedAttempts").is_some() {
+        return Failure::UsageLimit(resets_at(rate_limits));
+    }
+    if http_status == Some(401) || message.contains("401 unauthorized") {
+        return Failure::Auth;
+    }
+    Failure::Other
+}
+
+/// When the exhausted rate-limit window resets, in ms.
+fn resets_at(rate_limits: Option<&Value>) -> Option<f64> {
+    let limits = rate_limits?;
+    let windows = ["primary", "secondary"].map(|w| limits.get(w).filter(|w| !w.is_null()));
+    let exhausted = windows
+        .iter()
+        .flatten()
+        .filter(|w| w.get("usedPercent").and_then(Value::as_f64).is_some_and(|p| p >= 100.0))
+        .filter_map(|w| w.get("resetsAt").and_then(Value::as_f64))
+        .fold(None, |acc: Option<f64>, t| Some(acc.map_or(t, |a| a.max(t))));
+    exhausted.map(|s| s * 1000.0)
+}
+
+/// The text a failed turn reports: codex's message, with its details.
+pub(super) fn error_message(error: &Value) -> String {
+    let message = error.get("message").and_then(Value::as_str).unwrap_or("Codex failed").trim();
+    match error.get("additionalDetails").and_then(Value::as_str).map(str::trim).filter(|d| !d.is_empty()) {
+        Some(details) if !message.contains(details) => format!("{message}\n{details}"),
+        _ => message.to_owned(),
+    }
+}
+
+/// One choice of an approval: what ACP shows and what codex gets back.
+#[derive(Clone, Debug, PartialEq)]
+pub(super) struct Choice {
+    pub option: Value,
+    pub answer: Value,
+}
+
+/// The choices of a command or file-change approval: what codex offers
+/// (`availableDecisions`), else the usual four; a way to decline is always there.
+pub(super) fn decisions(params: &Value, command: bool) -> Vec<Choice> {
+    let offered: Vec<Value> = match params.get("availableDecisions").and_then(Value::as_array) {
+        Some(list) if !list.is_empty() => list.clone(),
+        _ => ["accept", "acceptForSession", "decline", "cancel"].map(|d| json!(d)).to_vec(),
+    };
+    let mut list = offered;
+    if !list.iter().any(|d| d == "decline") {
+        let at = list.iter().position(|d| d == "cancel").unwrap_or(list.len());
+        list.insert(at, json!("decline"));
+    }
+    let mut out: Vec<Choice> = Vec::new();
+    for decision in list {
+        let (id, name, kind) = match &decision {
+            Value::String(s) => match s.as_str() {
+                "accept" => {
+                    ("accept".to_owned(), if command { "Allow once" } else { "Allow" }.to_owned(), "allow_once")
+                }
+                "acceptForSession" => {
+                    ("acceptForSession".to_owned(), "Allow for this session".to_owned(), "allow_always")
+                }
+                "decline" => ("decline".to_owned(), "Decline".to_owned(), "reject_once"),
+                "cancel" => ("cancel".to_owned(), "Decline and stop".to_owned(), "reject_once"),
+                other => (other.to_owned(), other.to_owned(), "allow_once"),
+            },
+            Value::Object(o) => {
+                let Some((key, v)) = o.iter().next() else { continue };
+                match key.as_str() {
+                    "acceptWithExecpolicyAmendment" => {
+                        let prefix: Vec<&str> = v
+                            .get("execpolicy_amendment")
+                            .and_then(Value::as_array)
+                            .into_iter()
+                            .flatten()
+                            .filter_map(Value::as_str)
+                            .collect();
+                        let shown = shell_unwrapped(&prefix);
+                        (key.clone(), format!("Always allow `{shown}`"), "allow_always")
+                    }
+                    "applyNetworkPolicyAmendment" => {
+                        let a = v.get("network_policy_amendment").unwrap_or(&Value::Null);
+                        let host = a.get("host").and_then(Value::as_str).unwrap_or("this host");
+                        match a.get("action").and_then(Value::as_str) {
+                            Some("deny") => {
+                                (format!("{key}:deny:{host}"), format!("Always block {host}"), "reject_always")
+                            }
+                            _ => (format!("{key}:allow:{host}"), format!("Always allow {host}"), "allow_always"),
+                        }
+                    }
+                    other => (other.to_owned(), other.to_owned(), "allow_once"),
+                }
+            }
+            _ => continue,
+        };
+        if out.iter().any(|c| c.option["optionId"] == json!(id)) {
+            continue;
+        }
+        out.push(Choice {
+            option: json!({ "optionId": id, "name": name, "kind": kind }),
+            answer: json!({ "decision": decision }),
+        });
+    }
+    out
+}
+
+/// A command prefix as typed: the script of a `<shell> -lc <script>` wrapper, else the words.
+fn shell_unwrapped(argv: &[&str]) -> String {
+    match argv {
+        [_, flag, script] if flag.starts_with('-') && flag.ends_with('c') => (*script).to_owned(),
+        _ => argv.join(" "),
+    }
+}
+
+/// The codex answer for an ACP `session/request_permission` result; a cancelled or
+/// unknown outcome declines.
+pub(super) fn answer_of(choices: &[Choice], outcome: &Value, decline: Value) -> Value {
+    let chosen = outcome.pointer("/outcome/optionId").and_then(Value::as_str);
+    let selected = outcome.pointer("/outcome/outcome").and_then(Value::as_str) == Some("selected");
+    choices.iter().find(|c| selected && c.option["optionId"].as_str() == chosen).map_or(decline, |c| c.answer.clone())
+}
+
+/// The ACP title of a command approval.
+pub(super) fn command_approval_title(params: &Value, item: Option<&Value>, cwd: Option<&str>) -> String {
+    if let Some(host) = params.pointer("/networkApprovalContext/host").and_then(Value::as_str) {
+        return format!("Allow network access to {host}");
+    }
+    let from_item = item.and_then(|i| tool_call(i, false, cwd, None)).and_then(|c| str_of(&c, "title"));
+    let title = from_item.or_else(|| {
+        let synthetic = json!({ "id": "", "type": "commandExecution", "command": params.get("command"),
+            "commandActions": params.get("commandActions").cloned().unwrap_or(json!([])) });
+        tool_call(&synthetic, false, cwd, None).and_then(|c| str_of(&c, "title"))
+    });
+    match title.filter(|t| !t.is_empty()) {
+        Some(t) => format!("Run {t}"),
+        None => "Run a command".to_owned(),
+    }
+}
+
+/// The ACP title of a file-change approval, from the item it is about.
+pub(super) fn file_approval_title(item: Option<&Value>, cwd: Option<&str>) -> String {
+    let changes = item.and_then(|i| i.get("changes")).and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+    if changes.is_empty() {
+        return "Edit files".to_owned();
+    }
+    file_change_title(changes, cwd).0
+}
+
+/// A thread's history (`Thread.turns`) as the `session/update`s an ACP agent replays on `session/load`.
+pub(super) fn history(thread: &Value, cwd: Option<&str>) -> Vec<Value> {
+    let mut out = Vec::new();
+    for turn in thread.get("turns").and_then(Value::as_array).into_iter().flatten() {
+        for item in turn.get("items").and_then(Value::as_array).into_iter().flatten() {
+            match item.get("type").and_then(Value::as_str) {
+                Some("userMessage") => {
+                    for c in item.get("content").and_then(Value::as_array).into_iter().flatten() {
+                        match c.get("type").and_then(Value::as_str) {
+                            Some("text") => out.push(chunk(
+                                "user_message_chunk",
+                                c.get("text").and_then(Value::as_str).unwrap_or_default(),
+                            )),
+                            Some("image") => out.push(json!({ "sessionUpdate": "user_message_chunk",
+                                "content": { "type": "resource_link", "uri": c.get("url"), "name": "image" } })),
+                            Some("localImage" | "mention" | "skill") => {
+                                let path = c.get("path").and_then(Value::as_str).unwrap_or_default();
+                                out.push(chunk("user_message_chunk", path));
+                            }
+                            _ => {}
+                        }
+                    }
+                }
+                Some("agentMessage" | "plan") => {
+                    let text = item.get("text").and_then(Value::as_str).unwrap_or_default();
+                    if !text.is_empty() {
+                        out.push(chunk("agent_message_chunk", text));
+                    }
+                }
+                Some("reasoning") => {
+                    let text = reasoning_text(item);
+                    if !text.is_empty() {
+                        out.push(chunk("agent_thought_chunk", &text));
+                    }
+                }
+                _ => {
+                    if let Some(call) = tool_call(item, false, cwd, None) {
+                        out.push(call);
+                        out.extend(tool_call(item, true, cwd, None));
+                    }
+                }
+            }
+        }
+    }
+    out
+}
+
+/// A reasoning item's summary (or, without one, its raw text).
+pub(super) fn reasoning_text(item: &Value) -> String {
+    let parts = |k: &str| -> Vec<String> {
+        item.get(k)
+            .and_then(Value::as_array)
+            .into_iter()
+            .flatten()
+            .filter_map(Value::as_str)
+            .map(str::to_owned)
+            .collect()
+    };
+    let summary = parts("summary");
+    if summary.is_empty() { parts("content").join("\n\n") } else { summary.join("\n\n") }
+}
+
+/// The last characters of `text`, at most [`MAX_OUTPUT`] bytes.
+pub(super) fn tail(text: &str) -> String {
+    if text.len() <= MAX_OUTPUT {
+        return text.to_owned();
+    }
+    let mut cut = text.len() - MAX_OUTPUT;
+    while !text.is_char_boundary(cut) {
+        cut += 1;
+    }
+    format!("…{}", &text[cut..])
+}
+
+fn str_of(v: &Value, key: &str) -> Option<String> {
+    v.get(key).and_then(Value::as_str).map(str::to_owned)
+}

crates/ide-agent/src/native/mod.rs

@@ -0,0 +1,148 @@
+//! Agents driven over their own protocol rather than ACP: `codex app-server` and Claude
+//! Code's stream-json mode. Each runs behind an in-process ACP endpoint (a shim), so a
+//! task drives every agent the same way and reads what it can do from `initialize`.
+//!
+//! A shim speaks ACP v1 as the agent side, plus:
+//! - `agentCapabilities.sessionCapabilities.fork` and `session/fork`
+//!   (`{ sessionId, cwd, mcpServers }` → a `session/new` result for the copy);
+//! - `agentCapabilities._meta.openidea.rollback` and `_openidea/rollback`
+//!   (`{ sessionId, turns }`: drops the last `turns` user turns from the session);
+//! - `agentCapabilities._meta.openidea.steer` and `_openidea/steer`
+//!   (`{ sessionId, prompt }`: adds ACP content blocks to the running turn; fails when
+//!   no turn runs).
+
+pub(crate) mod claude;
+pub(crate) mod codex;
+
+use ide_jsonrpc::{Framing, Handler, Peer};
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
+/// The newest install of `command` on the `PATH` a child sees, by its `--version`.
+/// Several installs are common (npm, Homebrew, the vendor's own installer), and the first
+/// on `PATH` is often an old one that the service no longer serves the current models to.
+/// A path, or a name not found on `PATH`, is used as it is; a single match returns its
+/// resolved path so Windows `PATHEXT` shims (`claude.cmd`, `codex.cmd`) start.
+pub(crate) fn newest_install(command: &str) -> String {
+    let path = ide_core::process::host_var_os("PATH")
+        .or_else(|| ide_core::process::shell_env().find(|(k, _)| *k == "PATH").map(|(_, v)| v.to_owned()))
+        .unwrap_or_default();
+    // Windows: read afresh, so a tool the user installed since the IDE started is found too.
+    newest_install_in(command, &ide_core::process::with_user_path(&path))
+}
+
+fn newest_install_in(command: &str, search: &std::ffi::OsStr) -> String {
+    if Path::new(command).components().count() > 1 || Path::new(command).is_absolute() {
+        return command.to_owned();
+    }
+    let pathext = ide_core::process::host_var_os("PATHEXT");
+    let names =
+        ide_core::process::executable_names(command, cfg!(windows), pathext.as_deref().and_then(|p| p.to_str()));
+    let mut seen = Vec::new();
+    let candidates: Vec<PathBuf> = std::env::split_paths(search)
+        .filter(|d| !d.as_os_str().is_empty())
+        .flat_map(|dir| names.iter().map(move |n| dir.join(n)))
+        .filter(|p| p.is_file())
+        .filter(|p| {
+            let real = dunce::canonicalize(p).unwrap_or_else(|_| p.clone());
+            let new = !seen.contains(&real);
+            seen.push(real);
+            new
+        })
+        .collect();
+    if candidates.len() < 2 {
+        return candidates.into_iter().next().map_or_else(|| command.to_owned(), |p| p.to_string_lossy().into_owned());
+    }
+    candidates
+        .into_iter()
+        .filter_map(|p| version_of(&p).map(|v| (v, p)))
+        .max_by(|a, b| a.0.cmp(&b.0))
+        .map_or_else(|| command.to_owned(), |(_, p)| p.to_string_lossy().into_owned())
+}
+
+/// `x.y.z` from `<program> --version` ("codex-cli 0.164.0", "2.1.312 (Claude Code)").
+fn version_of(program: &Path) -> Option<Vec<u64>> {
+    let mut cmd = std::process::Command::new(program);
+    ide_core::process::prepare(&mut cmd);
+    let out = cmd.arg("--version").envs(ide_core::process::shell_env()).output().ok()?;
+    parse_version(&ide_core::output_encoding::decode_tool_output(&out.stdout))
+}
+
+fn parse_version(text: &str) -> Option<Vec<u64>> {
+    text.split_whitespace().find_map(|word| {
+        let parts: Vec<u64> = word.trim_start_matches('v').split('.').map_while(|p| p.parse().ok()).collect();
+        (parts.len() >= 2).then_some(parts)
+    })
+}
+
+/// The agent side of an in-process ACP connection.
+pub(crate) trait Shim: Handler {
+    /// Called once, before any message arrives: the connection to the client, for
+    /// `session/update` notifications and `session/request_permission` requests.
+    fn attach(&self, client: Peer);
+}
+
+/// Connects `client` to `shim`; returns the client's side. When the client goes away the
+/// shim's connection closes (`Peer::closed`); a shim closes the client's by killing its
+/// own side (`Peer::kill`) when its process exits.
+pub(crate) fn serve<S: Shim>(shim: Arc<S>, client: Arc<dyn Handler>) -> Peer {
+    let (ours, theirs) = tokio::io::duplex(1 << 20);
+    let (or, ow) = tokio::io::split(ours);
+    let (tr, tw) = tokio::io::split(theirs);
+    let to_client = Peer::connect_framed(tr, tw, shim.clone(), Framing::Lines);
+    shim.attach(to_client);
+    Peer::connect_framed(or, ow, client, Framing::Lines)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn versions_are_read_from_either_side_of_the_name() {
+        assert_eq!(parse_version("codex-cli 0.164.0\n"), Some(vec![0, 164, 0]));
+        assert_eq!(parse_version("2.1.312 (Claude Code)"), Some(vec![2, 1, 312]));
+        assert_eq!(parse_version("v1.2"), Some(vec![1, 2]));
+        assert_eq!(parse_version("no version here"), None);
+        assert!(parse_version("codex-cli 0.164.0") > parse_version("codex-cli 0.147.0"));
+    }
+
+    #[test]
+    fn newest_install_resolves_single_candidate_and_keeps_missing_or_paths() {
+        let dir = tempfile::tempdir().unwrap();
+        let a = dir.path().join("a");
+        let b = dir.path().join("b");
+        std::fs::create_dir_all(&a).unwrap();
+        std::fs::create_dir_all(&b).unwrap();
+        std::fs::write(a.join("claude"), "#!/bin/sh\n").unwrap();
+        std::fs::write(b.join("claude.cmd"), "@echo off\n").unwrap();
+        let search = std::env::join_paths([&a, &b]).unwrap();
+        if cfg!(windows) {
+            assert_eq!(newest_install_in("claude", &search), b.join("claude.cmd").to_string_lossy());
+        } else {
+            assert_eq!(newest_install_in("claude", &search), a.join("claude").to_string_lossy());
+        }
+        assert_eq!(newest_install_in("nope", &search), "nope");
+        assert_eq!(newest_install_in("bin/claude", &search), "bin/claude");
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn newest_install_compares_versions_across_path_entries() {
+        use std::os::unix::fs::PermissionsExt;
+
+        let dir = tempfile::tempdir().unwrap();
+        let old = dir.path().join("old");
+        let new = dir.path().join("new");
+        for (path, version) in [(&old, "2.9.0"), (&new, "2.10.0")] {
+            std::fs::create_dir_all(path).unwrap();
+            let executable = path.join("agent");
+            std::fs::write(&executable, format!("#!/bin/sh\necho {version}\n")).unwrap();
+            std::fs::set_permissions(&executable, std::fs::Permissions::from_mode(0o755)).unwrap();
+        }
+        for paths in [[&old, &new], [&new, &old]] {
+            let search = std::env::join_paths(paths).unwrap();
+            assert_eq!(newest_install_in("agent", &search), new.join("agent").to_string_lossy());
+        }
+    }
+}

crates/ide-agent/src/provider.rs

@@ -0,0 +1,253 @@
+//! Agents and how to launch them: the built-in ones, plus user-defined agents from
+//! `<config>/agents/<id>.toml` (written by hand, or by installing one from the ACP
+//! Registry, see `registry`).
+
+use crate::AgentSource;
+use serde::{Deserialize, Serialize};
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+/// The protocol an agent speaks. Native ones run behind an in-process ACP endpoint
+/// (`native`), so tasks see every agent as ACP and read features from its capabilities.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub(crate) enum Driver {
+    #[default]
+    Acp,
+    /// `codex app-server`.
+    Codex,
+    /// `claude` in stream-json mode.
+    Claude,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub(crate) struct ProviderSpec {
+    pub id: String,
+    pub name: String,
+    pub driver: Driver,
+    pub command: String,
+    pub args: Vec<String>,
+    pub env: Vec<(String, String)>,
+    /// How to sign in when the agent reports it needs authentication.
+    pub login_hint: String,
+    pub source: AgentSource,
+}
+
+/// `(id, name, driver, command line, sign-in hint)`. npm adapters are pinned so a
+/// session's protocol does not change under the user.
+const BUILTIN: &[(&str, &str, Driver, &[&str], &str)] = &[
+    ("claude", "Claude Code", Driver::Claude, &["claude"], "Run `claude` in a terminal and sign in."),
+    ("codex", "Codex", Driver::Codex, &["codex", "app-server"], "Run `codex login` in a terminal."),
+    (
+        "claude-acp",
+        "Claude Code (ACP)",
+        Driver::Acp,
+        &["npx", "-y", "@agentclientprotocol/[email protected]"],
+        "Run `claude` in a terminal and sign in.",
+    ),
+    (
+        "codex-acp",
+        "Codex (ACP)",
+        Driver::Acp,
+        &["npx", "-y", "@agentclientprotocol/[email protected]"],
+        "Run `codex login` in a terminal.",
+    ),
+    ("gemini", "Gemini CLI", Driver::Acp, &["gemini", "--experimental-acp"], "Run `gemini` in a terminal and sign in."),
+    ("copilot", "GitHub Copilot", Driver::Acp, &["copilot", "--acp"], "Run `copilot` in a terminal and sign in."),
+    ("cursor", "Cursor", Driver::Acp, &["cursor-agent", "acp"], "Run `cursor-agent login` in a terminal."),
+    ("opencode", "OpenCode", Driver::Acp, &["opencode", "acp"], "Run `opencode auth login` in a terminal."),
+    ("qwen", "Qwen Code", Driver::Acp, &["qwen", "--experimental-acp"], "Run `qwen` in a terminal and sign in."),
+    ("kimi", "Kimi CLI", Driver::Acp, &["kimi", "acp"], "Run `kimi` in a terminal and sign in."),
+    ("goose", "Goose", Driver::Acp, &["goose", "acp"], "Run `goose configure` in a terminal."),
+    ("auggie", "Auggie", Driver::Acp, &["auggie", "--acp"], "Run `auggie login` in a terminal."),
+    ("kiro", "Kiro", Driver::Acp, &["kiro-cli", "acp"], "Run `kiro-cli login` in a terminal."),
+    ("vibe", "Mistral Vibe", Driver::Acp, &["vibe-acp"], "Run `vibe` in a terminal and sign in."),
+];
+
+fn builtins() -> Vec<ProviderSpec> {
+    BUILTIN
+        .iter()
+        .map(|(id, name, driver, cmd, hint)| ProviderSpec {
+            id: (*id).into(),
+            name: (*name).into(),
+            driver: *driver,
+            command: cmd[0].into(),
+            args: cmd[1..].iter().map(|a| (*a).to_owned()).collect(),
+            env: Vec::new(),
+            login_hint: (*hint).into(),
+            source: AgentSource::Builtin,
+        })
+        .collect()
+}
+
+/// Whether `id` names a built-in agent.
+pub(crate) fn is_builtin(id: &str) -> bool {
+    BUILTIN.iter().any(|b| b.0 == id)
+}
+
+/// An agent file, `<config>/agents/<id>.toml`.
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub(crate) struct CustomAgent {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+    #[serde(default, skip_serializing_if = "Driver::is_acp")]
+    pub driver: Driver,
+    pub command: String,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub args: Vec<String>,
+    #[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
+    pub env: BTreeMap<String, String>,
+    /// Set when the agent was installed from the ACP Registry.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub registry: Option<RegistryRef>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub(crate) struct RegistryRef {
+    pub id: String,
+    pub version: String,
+}
+
+impl Driver {
+    fn is_acp(&self) -> bool {
+        *self == Driver::Acp
+    }
+}
+
+impl CustomAgent {
+    pub(crate) fn read(path: &Path) -> Result<Self, String> {
+        std::fs::read_to_string(path)
+            .map_err(|e| e.to_string())
+            .and_then(|t| toml::from_str::<CustomAgent>(&t).map_err(|e| e.to_string()))
+    }
+
+    /// Writes the file atomically (a reader never sees half of it).
+    pub(crate) fn write(&self, path: &Path) -> std::io::Result<()> {
+        let text = toml::to_string(self).map_err(std::io::Error::other)?;
+        if let Some(dir) = path.parent() {
+            std::fs::create_dir_all(dir)?;
+        }
+        let tmp = path.with_extension("toml.tmp");
+        std::fs::write(&tmp, text)?;
+        std::fs::rename(&tmp, path)
+    }
+}
+
+/// Built-in agents, then the `*.toml` agents of `custom_dir`; a custom agent with a
+/// built-in id replaces it.
+pub(crate) fn load(custom_dir: Option<&Path>) -> Vec<ProviderSpec> {
+    let mut specs = builtins();
+    let mut files: Vec<PathBuf> = custom_dir
+        .and_then(|d| std::fs::read_dir(d).ok())
+        .into_iter()
+        .flatten()
+        .flatten()
+        .map(|e| e.path())
+        .filter(|p| p.extension().is_some_and(|e| e == "toml"))
+        .collect();
+    files.sort();
+    for path in files {
+        let Some(id) = path.file_stem().and_then(|s| s.to_str()).map(str::to_owned) else { continue };
+        let agent = match CustomAgent::read(&path) {
+            Ok(a) => a,
+            Err(e) => {
+                tracing::warn!("skipping agent {}: {e}", path.display());
+                continue;
+            }
+        };
+        let env: Vec<(String, String)> = agent.env.into_iter().collect();
+        let source = match agent.registry {
+            Some(r) => AgentSource::Registry { version: r.version, update: None },
+            None => AgentSource::Custom,
+        };
+        let spec = ProviderSpec {
+            name: agent.name.unwrap_or_else(|| id.clone()),
+            driver: agent.driver,
+            command: agent.command,
+            args: agent.args,
+            env,
+            login_hint: "Sign in with the agent's own command line first.".into(),
+            source,
+            id,
+        };
+        match specs.iter_mut().find(|s| s.id == spec.id) {
+            Some(existing) => *existing = spec,
+            None => specs.push(spec),
+        }
+    }
+    specs
+}
+
+/// Whether `command` resolves to an executable (a path, or a name on `PATH`).
+pub(crate) fn installed(command: &str) -> bool {
+    let p = Path::new(command);
+    if p.components().count() > 1 {
+        return is_executable(p);
+    }
+    let exts: &[&str] = if cfg!(windows) { &["exe", "cmd", "bat"] } else { &[] };
+    std::env::var_os("PATH").is_some_and(|path| {
+        std::env::split_paths(&path).any(|dir| {
+            let c = dir.join(command);
+            is_executable(&c) || exts.iter().any(|e| is_executable(&c.with_extension(e)))
+        })
+    })
+}
+
+fn is_executable(p: &Path) -> bool {
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        p.metadata().is_ok_and(|m| m.is_file() && m.permissions().mode() & 0o111 != 0)
+    }
+    #[cfg(not(unix))]
+    {
+        p.is_file()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn custom_agents_extend_and_override_the_builtins() {
+        let dir = tempfile::tempdir().unwrap();
+        let write = |name: &str, text: &str| std::fs::write(dir.path().join(name), text).unwrap();
+        write("mine.toml", "name = \"Mine\"\ncommand = \"/opt/mine\"\nargs = [\"acp\"]\n[env]\nK = \"v\"\n");
+        write("gemini.toml", "command = \"gemini\"\nargs = [\"--acp\"]\n");
+        write("broken.toml", "nope = 1\n");
+        let specs = load(Some(dir.path()));
+        let mine = specs.iter().find(|s| s.id == "mine").unwrap();
+        assert_eq!((mine.name.as_str(), mine.command.as_str()), ("Mine", "/opt/mine"));
+        assert_eq!(mine.env, vec![("K".to_owned(), "v".to_owned())]);
+        let gemini = specs.iter().find(|s| s.id == "gemini").unwrap();
+        assert_eq!((gemini.name.as_str(), gemini.args.as_slice()), ("gemini", &["--acp".to_owned()][..]));
+        assert!(!specs.iter().any(|s| s.id == "broken"));
+        assert_eq!(specs.iter().filter(|s| s.id == "claude").count(), 1);
+        assert!(!installed("/definitely/not/here"));
+        assert!(installed("sh"));
+    }
+
+    #[test]
+    fn agent_files_round_trip_with_their_registry_table() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("agents").join("amp-acp.toml");
+        let agent = CustomAgent {
+            name: Some("Amp".into()),
+            driver: Driver::Acp,
+            command: "/data/agents/tools/amp-acp/0.10.0/amp-acp".into(),
+            args: vec!["acp".into()],
+            env: BTreeMap::from([("K".to_owned(), "v".to_owned())]),
+            registry: Some(RegistryRef { id: "amp-acp".into(), version: "0.10.0".into() }),
+        };
+        agent.write(&path).unwrap();
+        let text = std::fs::read_to_string(&path).unwrap();
+        assert!(text.contains("[registry]") && !text.contains("driver"), "{text}");
+        assert_eq!(CustomAgent::read(&path).unwrap(), agent);
+        let spec = load(Some(path.parent().unwrap())).into_iter().find(|s| s.id == "amp-acp").unwrap();
+        assert_eq!(spec.source, AgentSource::Registry { version: "0.10.0".into(), update: None });
+        assert!(toml::from_str::<CustomAgent>("command = \"x\"\n[registry]\nid = \"x\"\n").is_err());
+    }
+}

crates/ide-agent/src/registry.rs

@@ -0,0 +1,949 @@
+//! The ACP Registry (agentclientprotocol.com): third-party agents, installed into an
+//! app-owned directory and saved as `<config>/agents/<id>.toml` with a `[registry]` table.
+//!
+//! An installed agent runs from `<data>/agents/tools/<id>/<version>/`: a release archive
+//! (SHA-256 checked when the registry gives one), an npm package installed there at the
+//! registry's exact version, or a uv tool. Updating installs the new version alongside
+//! and switches the agent file; [`maintain`] removes versions no agent file uses at the
+//! next start, when no task runs on them.
+
+use crate::provider::{self, CustomAgent, Driver, RegistryRef};
+use crate::{AgentProvider, AgentSource};
+use ide_core::error::ErrorKind;
+use ide_core::{CancellationToken, IdeError, IdeResult};
+use ide_tools::archive::{self, ArchiveKind};
+use ide_tools::platform::{Arch, Os, Platform};
+use ide_tools::{Emit, Http, InstallEvent};
+use serde::{Deserialize, Serialize};
+use specta::Type;
+use std::cmp::Ordering;
+use std::collections::BTreeMap;
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::time::Duration;
+
+pub const REGISTRY_URL: &str = "https://cdn.agentclientprotocol.com/registry/v1/latest/registry.json";
+const MAX_REGISTRY_BYTES: u64 = 1024 * 1024;
+/// [`maintain`] refreshes a saved index older than this, so updates show without opening
+/// the registry.
+const REFRESH_AFTER: Duration = Duration::from_secs(24 * 60 * 60);
+
+#[derive(Clone, Debug)]
+pub struct RegistryPaths {
+    /// Agent files, `<config>/agents`.
+    pub agents_dir: PathBuf,
+    /// Installed agents, `<data>/agents/tools/<id>/<version>`.
+    pub tools_dir: PathBuf,
+    /// The index as last fetched, for offline use and update checks.
+    pub cache_file: PathBuf,
+}
+
+impl RegistryPaths {
+    pub fn new(config_dir: &Path, data_dir: &Path) -> Self {
+        Self {
+            agents_dir: config_dir.join("agents"),
+            tools_dir: data_dir.join("agents").join("tools"),
+            cache_file: data_dir.join("agents").join("registry.json"),
+        }
+    }
+
+    fn agent_file(&self, id: &str) -> PathBuf {
+        self.agents_dir.join(format!("{id}.toml"))
+    }
+}
+
+/// A registry agent this machine can run (or has installed).
+#[derive(Clone, Debug, PartialEq, Serialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct RegistryAgent {
+    pub id: String,
+    pub name: String,
+    /// The registry's current version.
+    pub version: String,
+    pub description: String,
+    pub repository: Option<String>,
+    pub website: Option<String>,
+    pub authors: Vec<String>,
+    pub license: Option<String>,
+    /// How it installs here; `None` when it no longer can (an installed agent whose
+    /// runtime went away).
+    pub distribution: Option<RegistryDistribution>,
+    /// The release archive comes without a SHA-256, so the download cannot be checked.
+    /// npm and uv packages are checked by those tools.
+    pub no_checksum: bool,
+    /// The installed version.
+    pub installed: Option<String>,
+    /// Whether [`Self::version`] is newer than the installed one.
+    pub update: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum RegistryDistribution {
+    /// A release archive for this OS and architecture.
+    Binary,
+    /// An npm package (needs Node.js).
+    Npx,
+    /// A Python package run by uv.
+    Uvx,
+}
+
+#[derive(Clone, Debug, Serialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentRegistry {
+    pub agents: Vec<RegistryAgent>,
+    /// Set when the registry could not be reached and the copy saved earlier is shown.
+    pub warning: Option<String>,
+}
+
+// ---- the index (https://github.com/agentclientprotocol/registry) ----
+
+#[derive(Clone, Debug, Deserialize)]
+struct Entry {
+    id: String,
+    name: String,
+    version: String,
+    #[serde(default)]
+    description: String,
+    #[serde(default)]
+    repository: Option<String>,
+    #[serde(default)]
+    website: Option<String>,
+    #[serde(default)]
+    authors: Vec<String>,
+    #[serde(default)]
+    license: Option<String>,
+    #[serde(default)]
+    distribution: Distribution,
+}
+
+#[derive(Clone, Debug, Default, Deserialize)]
+struct Distribution {
+    /// By `<os>-<arch>`, e.g. `darwin-aarch64`.
+    #[serde(default)]
+    binary: BTreeMap<String, Binary>,
+    #[serde(default)]
+    npx: Option<Package>,
+    #[serde(default)]
+    uvx: Option<Package>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+struct Binary {
+    archive: String,
+    /// Path of the executable inside the archive.
+    cmd: String,
+    #[serde(default)]
+    args: Vec<String>,
+    #[serde(default)]
+    env: BTreeMap<String, String>,
+    #[serde(default)]
+    sha256: Option<String>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+struct Package {
+    /// `name@version` (npm) or `name==version` (uv).
+    package: String,
+    #[serde(default)]
+    args: Vec<String>,
+    #[serde(default)]
+    env: BTreeMap<String, String>,
+}
+
+fn parse(text: &str) -> IdeResult<Vec<Entry>> {
+    #[derive(Deserialize)]
+    struct Index {
+        agents: Vec<serde_json::Value>,
+    }
+    let index: Index = serde_json::from_str(text)
+        .map_err(|e| IdeError::new(ErrorKind::Protocol, format!("the ACP Registry index is invalid: {e}")))?;
+    // One malformed entry does not hide the others; ids and versions name directories.
+    Ok(index
+        .agents
+        .into_iter()
+        .filter_map(|v| serde_json::from_value::<Entry>(v).ok())
+        .filter(|e| safe_segment(&e.id) && safe_segment(&e.version))
+        .collect())
+}
+
+fn safe_segment(s: &str) -> bool {
+    !s.is_empty()
+        && !s.starts_with('.')
+        && s.len() <= 128
+        && s.chars().all(|c| c.is_ascii_alphanumeric() || matches!(c, '.' | '_' | '-' | '+'))
+}
+
+/// How an entry installs on `platform`: its binary for this OS/arch first, then npm
+/// (needs `npm` and `node`), then uv.
+enum Choice<'a> {
+    Binary(&'a Binary),
+    Npx(&'a Package),
+    Uvx(&'a Package),
+}
+
+impl Choice<'_> {
+    fn kind(&self) -> RegistryDistribution {
+        match self {
+            Choice::Binary(_) => RegistryDistribution::Binary,
+            Choice::Npx(_) => RegistryDistribution::Npx,
+            Choice::Uvx(_) => RegistryDistribution::Uvx,
+        }
+    }
+}
+
+fn platform_key(p: Platform) -> String {
+    let os = match p.os {
+        Os::Mac => "darwin",
+        Os::Linux => "linux",
+        Os::Windows => "windows",
+    };
+    let arch = match p.arch {
+        Arch::Arm64 => "aarch64",
+        Arch::X64 => "x86_64",
+    };
+    format!("{os}-{arch}")
+}
+
+fn choose<'a>(entry: &'a Entry, platform: Platform, on_path: &dyn Fn(&str) -> bool) -> Option<Choice<'a>> {
+    let d = &entry.distribution;
+    if let Some(b) = d.binary.get(&platform_key(platform)) {
+        return Some(Choice::Binary(b));
+    }
+    if let Some(p) = &d.npx
+        && on_path("npm")
+        && on_path("node")
+    {
+        return Some(Choice::Npx(p));
+    }
+    if let Some(p) = &d.uvx
+        && on_path("uv")
+    {
+        return Some(Choice::Uvx(p));
+    }
+    // Last resort: npx and uvx run natively, this one under OS emulation.
+    if platform.os == Os::Windows
+        && platform.arch == Arch::Arm64
+        && let Some(b) = d.binary.get("windows-x86_64")
+    {
+        return Some(Choice::Binary(b));
+    }
+    None
+}
+
+/// Registry agents that are built-in ones under another id.
+const BUILTIN_ALIASES: &[&str] = &["github-copilot-cli", "qwen-code", "mistral-vibe"];
+
+fn is_builtin(id: &str) -> bool {
+    provider::is_builtin(id) || BUILTIN_ALIASES.contains(&id)
+}
+
+fn on_path(command: &str) -> bool {
+    which::which(command).is_ok()
+}
+
+/// `1.10.0` > `1.9.2`; a release is newer than its pre-releases.
+fn is_newer(latest: &str, current: &str) -> bool {
+    fn parts(v: &str) -> Vec<&str> {
+        v.trim_start_matches('v').split(['.', '-', '+']).collect()
+    }
+    let (a, b) = (parts(latest), parts(current));
+    for (x, y) in a.iter().zip(&b) {
+        let ord = match (x.parse::<u64>(), y.parse::<u64>()) {
+            (Ok(x), Ok(y)) => x.cmp(&y),
+            (Ok(_), Err(_)) => Ordering::Greater,
+            (Err(_), Ok(_)) => Ordering::Less,
+            (Err(_), Err(_)) => x.cmp(y),
+        };
+        if ord != Ordering::Equal {
+            return ord == Ordering::Greater;
+        }
+    }
+    // `1.0.0` vs `1.0.0-beta`: the shorter is the release.
+    a.len() < b.len()
+}
+
+// ---- listing ----
+
+/// Registry agents this machine can run, except built-in ones and ids the user's own
+/// agent files take. Falls back to the saved index when the registry is unreachable.
+pub fn list(paths: &RegistryPaths, cancel: &CancellationToken) -> IdeResult<AgentRegistry> {
+    let (text, warning) = match fetch(paths, cancel) {
+        Ok(text) => (text, None),
+        Err(e) if e.kind == ErrorKind::Cancelled => return Err(e),
+        Err(e) => match fs::read_to_string(&paths.cache_file) {
+            Ok(text) => (
+                text,
+                Some(format!("Could not reach the ACP Registry ({}); showing the list saved earlier.", e.message)),
+            ),
+            Err(_) => return Err(e),
+        },
+    };
+    let agents = visible(paths, &parse(&text)?, Platform::current(), &on_path);
+    Ok(AgentRegistry { agents, warning })
+}
+
+fn visible(
+    paths: &RegistryPaths,
+    entries: &[Entry],
+    platform: Platform,
+    on_path: &dyn Fn(&str) -> bool,
+) -> Vec<RegistryAgent> {
+    let mut agents: Vec<RegistryAgent> = entries
+        .iter()
+        .filter(|e| !is_builtin(&e.id))
+        .filter_map(|e| {
+            let file = paths.agent_file(&e.id);
+            let installed = if file.exists() {
+                // A file of the user's own (or one that does not parse) keeps its id.
+                Some(CustomAgent::read(&file).ok()?.registry?.version)
+            } else {
+                None
+            };
+            let choice = choose(e, platform, on_path);
+            let no_checksum = matches!(choice, Some(Choice::Binary(b)) if b.sha256.is_none());
+            let distribution = choice.map(|c| c.kind());
+            if distribution.is_none() && installed.is_none() {
+                return None;
+            }
+            Some(RegistryAgent {
+                update: installed.as_deref().is_some_and(|v| is_newer(&e.version, v)),
+                id: e.id.clone(),
+                name: e.name.clone(),
+                version: e.version.clone(),
+                description: e.description.clone(),
+                repository: e.repository.clone(),
+                website: e.website.clone(),
+                authors: e.authors.clone(),
+                license: e.license.clone(),
+                distribution,
+                no_checksum,
+                installed,
+            })
+        })
+        .collect();
+    agents.sort_by_key(|a| a.name.to_lowercase());
+    agents
+}
+
+/// Fills in [`AgentSource::Registry::update`] from the saved index.
+pub fn mark_updates(paths: &RegistryPaths, providers: &mut [AgentProvider]) {
+    let Some(entries) = fs::read_to_string(&paths.cache_file).ok().and_then(|t| parse(&t).ok()) else { return };
+    for p in providers {
+        if let AgentSource::Registry { version, update } = &mut p.source
+            && let Some(e) = entries.iter().find(|e| e.id == p.id)
+            && is_newer(&e.version, version)
+        {
+            *update = Some(e.version.clone());
+        }
+    }
+}
+
+/// HTTPS only, redirects included. Tests serve downloads over `file://`.
+fn http() -> IdeResult<Http> {
+    let http = Http::new(&ide_core::tool_path::search_path())?;
+    Ok(if cfg!(test) { http } else { http.https_only() })
+}
+
+fn check_url(url: &str) -> IdeResult<()> {
+    if url.starts_with("https://") || (cfg!(test) && url.starts_with("file://")) {
+        Ok(())
+    } else {
+        Err(IdeError::new(ErrorKind::Protocol, format!("refusing to download {url}: only HTTPS downloads are allowed")))
+    }
+}
+
+/// An npm / uv package spec from the registry, which must not read as an option.
+fn check_spec(spec: &str) -> IdeResult<()> {
+    if spec.is_empty() || spec.starts_with('-') || spec.chars().any(char::is_whitespace) {
+        Err(IdeError::new(ErrorKind::Protocol, format!("unsupported package `{spec}`")))
+    } else {
+        Ok(())
+    }
+}
+
+fn fetch(paths: &RegistryPaths, cancel: &CancellationToken) -> IdeResult<String> {
+    let http = http()?;
+    let text = http.get_text_limited(REGISTRY_URL, Some(MAX_REGISTRY_BYTES), cancel)?;
+    parse(&text)?;
+    if let Err(e) = write_atomic(&paths.cache_file, text.as_bytes()) {
+        tracing::warn!("cannot save the ACP Registry index: {e}");
+    }
+    Ok(text)
+}
+
+fn write_atomic(path: &Path, bytes: &[u8]) -> std::io::Result<()> {
+    if let Some(dir) = path.parent() {
+        fs::create_dir_all(dir)?;
+    }
+    let tmp = path.with_extension("tmp");
+    fs::write(&tmp, bytes)?;
+    fs::rename(&tmp, path)
+}
+
+// ---- install / remove ----
+
+/// Installs (or updates to) the registry's current version of `id`, streaming progress
+/// through `emit`, and points the agent file at it.
+pub fn install(paths: &RegistryPaths, id: &str, cancel: &CancellationToken, emit: Emit) -> IdeResult<()> {
+    // The saved index is what the user picked from; fetch only when there is none.
+    let text = match fs::read_to_string(&paths.cache_file) {
+        Ok(text) => text,
+        Err(_) => fetch(paths, cancel)?,
+    };
+    let entries = parse(&text)?;
+    let entry = entries
+        .iter()
+        .find(|e| e.id == id)
+        .ok_or_else(|| IdeError::not_found(format!("{id} is not in the ACP Registry")))?;
+    install_entry(paths, entry, Platform::current(), &on_path, cancel, emit)
+}
+
+fn install_entry(
+    paths: &RegistryPaths,
+    entry: &Entry,
+    platform: Platform,
+    on_path: &dyn Fn(&str) -> bool,
+    cancel: &CancellationToken,
+    emit: Emit,
+) -> IdeResult<()> {
+    if is_builtin(&entry.id) {
+        return Err(IdeError::invalid(format!("{} is built in", entry.name)));
+    }
+    let file = paths.agent_file(&entry.id);
+    if file.exists() && CustomAgent::read(&file).ok().and_then(|a| a.registry).is_none() {
+        return Err(IdeError::new(
+            ErrorKind::AlreadyExists,
+            format!("{} already defines an agent with this id", file.display()),
+        ));
+    }
+    let choice = choose(entry, platform, on_path).ok_or_else(|| {
+        IdeError::unavailable(format!("{} has no build for this system (or needs Node.js or uv)", entry.name))
+    })?;
+    let dir = paths.tools_dir.join(&entry.id).join(&entry.version);
+    if dir.exists() {
+        fs::remove_dir_all(&dir)?;
+    }
+    fs::create_dir_all(&dir)?;
+    let installed = match &choice {
+        Choice::Binary(b) => install_binary(b, &dir, cancel, emit).map(|exe| (exe, b.args.clone(), b.env.clone())),
+        Choice::Npx(p) => {
+            install_npm(p, entry, &dir, platform, cancel, emit).map(|exe| (exe, p.args.clone(), p.env.clone()))
+        }
+        Choice::Uvx(p) => {
+            install_uv(p, entry, &dir, platform, cancel, emit).map(|exe| (exe, p.args.clone(), p.env.clone()))
+        }
+    };
+    let (exe, args, env) = match installed {
+        Ok(x) => x,
+        Err(e) => {
+            let _ = fs::remove_dir_all(&dir);
+            return Err(e);
+        }
+    };
+    let agent = CustomAgent {
+        name: Some(entry.name.clone()),
+        driver: Driver::Acp,
+        command: exe.to_string_lossy().into_owned(),
+        args,
+        env,
+        registry: Some(RegistryRef { id: entry.id.clone(), version: entry.version.clone() }),
+    };
+    agent.write(&file)?;
+    emit(InstallEvent::Line { text: format!("{} {} installed", entry.name, entry.version) });
+    Ok(())
+}
+
+pub(crate) fn verify_sha256(file: &Path, expected: &str) -> IdeResult<()> {
+    let actual = ide_tools::sources::sha256_file(file)?;
+    if actual.eq_ignore_ascii_case(expected.trim()) {
+        Ok(())
+    } else {
+        Err(IdeError::new(ErrorKind::Io, format!("checksum mismatch: expected SHA-256 {expected}, got {actual}")))
+    }
+}
+
+/// The segments of an archive's `cmd` (`./bin/agent`, `./dist\agent.cmd`), refusing
+/// paths that leave the archive.
+fn command_path(cmd: &str) -> IdeResult<Vec<String>> {
+    let normalized = cmd.replace('\\', "/");
+    let bad = || IdeError::new(ErrorKind::Protocol, format!("unsupported command path `{cmd}`"));
+    if normalized.starts_with('/') || normalized.contains(':') {
+        return Err(bad());
+    }
+    let parts: Vec<String> = normalized.split('/').filter(|p| !p.is_empty() && *p != ".").map(str::to_owned).collect();
+    if parts.is_empty() || parts.iter().any(|p| p == "..") {
+        return Err(bad());
+    }
+    Ok(parts)
+}
+
+fn install_binary(b: &Binary, dir: &Path, cancel: &CancellationToken, emit: Emit) -> IdeResult<PathBuf> {
+    let segments = command_path(&b.cmd)?;
+    check_url(&b.archive)?;
+    let url_path = b.archive.split(['?', '#']).next().unwrap_or_default();
+    let name = url_path
+        .rsplit('/')
+        .next()
+        .filter(|n| !n.is_empty() && *n != "." && *n != ".." && !n.contains('\\'))
+        .unwrap_or("download");
+    let downloads = dir.join(".download");
+    fs::create_dir_all(&downloads)?;
+    let file = downloads.join(name);
+    emit(InstallEvent::Line { text: format!("Downloading {}", b.archive) });
+    http()?.download(&b.archive, &file, None, cancel, emit)?;
+    match &b.sha256 {
+        Some(expected) => {
+            verify_sha256(&file, expected)?;
+            emit(InstallEvent::Line { text: "SHA-256 checksum verified".into() });
+        }
+        None => emit(InstallEvent::Line { text: "The registry gives no checksum for this download".into() }),
+    }
+    if cancel.is_cancelled() {
+        return Err(IdeError::cancelled());
+    }
+    emit(InstallEvent::Line { text: "Extracting…".into() });
+    let kind = ArchiveKind::from_name(name);
+    let (exe_name, parents) = segments.split_last().expect("command_path is never empty");
+    let dest = match kind {
+        // A bare executable goes where `cmd` expects it.
+        ArchiveKind::Raw | ArchiveKind::Gz => parents.iter().fold(dir.to_path_buf(), |p, s| p.join(s)),
+        _ => dir.to_path_buf(),
+    };
+    archive::extract(&file, kind, &dest, exe_name, cancel)?;
+    let _ = fs::remove_dir_all(&downloads);
+    let exe = segments.iter().fold(dir.to_path_buf(), |p, s| p.join(s));
+    if !exe.is_file() {
+        return Err(IdeError::new(ErrorKind::Protocol, format!("the download has no {}", b.cmd)));
+    }
+    archive::make_executable(&exe)?;
+    Ok(exe)
+}
+
+/// `@scope/[email protected]` → (`@scope/name`, `1.2.3`).
+fn split_npm_spec(spec: &str) -> (&str, Option<&str>) {
+    let start = usize::from(spec.starts_with('@'));
+    match spec[start..].find('@') {
+        Some(i) => (&spec[..start + i], Some(&spec[start + i + 1..])),
+        None => (spec, None),
+    }
+}
+
+/// The command of an npm package: its only one, else the one named after the package
+/// or the agent.
+fn npm_bin(manifest: &serde_json::Value, name: &str, agent_id: &str) -> Option<String> {
+    let base = name.rsplit('/').next().unwrap_or(name);
+    match manifest.get("bin")? {
+        serde_json::Value::String(_) => Some(base.to_owned()),
+        serde_json::Value::Object(bins) if bins.len() == 1 => bins.keys().next().cloned(),
+        serde_json::Value::Object(bins) => {
+            [base, agent_id].into_iter().find(|k| bins.contains_key(*k)).map(str::to_owned)
+        }
+        _ => None,
+    }
+}
+
+fn install_npm(
+    p: &Package,
+    entry: &Entry,
+    dir: &Path,
+    platform: Platform,
+    cancel: &CancellationToken,
+    emit: Emit,
+) -> IdeResult<PathBuf> {
+    let (name, version) = split_npm_spec(&p.package);
+    let spec = match version {
+        Some(v) if !v.is_empty() => p.package.clone(),
+        _ => format!("{name}@{}", entry.version),
+    };
+    check_spec(&spec)?;
+    let npm = which::which("npm").map_err(|_| IdeError::unavailable(format!("npm is required to install {name}")))?;
+    let mut cmd = Command::new(npm);
+    cmd.arg("install").arg("--prefix").arg(dir).args(["--no-audit", "--no-fund"]).arg(&spec).current_dir(dir);
+    ide_tools::run_streamed(cmd, cancel, emit)?;
+    let modules = dir.join("node_modules");
+    let manifest: serde_json::Value = fs::read_to_string(modules.join(name).join("package.json"))
+        .ok()
+        .and_then(|t| serde_json::from_str(&t).ok())
+        .ok_or_else(|| IdeError::new(ErrorKind::Protocol, format!("{spec} was not installed")))?;
+    let bin = npm_bin(&manifest, name, &entry.id)
+        .ok_or_else(|| IdeError::new(ErrorKind::Protocol, format!("{spec} has no command to run")))?;
+    let file = if platform.os == Os::Windows { format!("{bin}.cmd") } else { bin };
+    let exe = modules.join(".bin").join(file);
+    if !exe.exists() {
+        return Err(IdeError::new(ErrorKind::Protocol, format!("{spec} did not install {}", exe.display())));
+    }
+    Ok(exe)
+}
+
+/// `name[extra]==1.2` → (`name`, `1.2`).
+fn split_uv_spec(spec: &str) -> (&str, Option<&str>) {
+    let (name, version) = match spec.split_once("==") {
+        Some((n, v)) => (n, Some(v.trim())),
+        None => (spec, None),
+    };
+    (name.split('[').next().unwrap_or(name).trim(), version)
+}
+
+fn install_uv(
+    p: &Package,
+    entry: &Entry,
+    dir: &Path,
+    platform: Platform,
+    cancel: &CancellationToken,
+    emit: Emit,
+) -> IdeResult<PathBuf> {
+    let (name, version) = split_uv_spec(&p.package);
+    let spec = match version {
+        Some(v) if !v.is_empty() => p.package.clone(),
+        _ => format!("{name}=={}", entry.version),
+    };
+    check_spec(&spec)?;
+    let uv = which::which("uv").map_err(|_| IdeError::unavailable(format!("uv is required to install {name}")))?;
+    let bin = dir.join("bin");
+    let mut cmd = Command::new(uv);
+    cmd.args(["tool", "install", "--force"])
+        .arg(&spec)
+        .env("UV_TOOL_DIR", dir.join("tools"))
+        .env("UV_TOOL_BIN_DIR", &bin)
+        .current_dir(dir);
+    ide_tools::run_streamed(cmd, cancel, emit)?;
+    let exe = [name, entry.id.as_str()].iter().map(|n| bin.join(platform.exe(n))).find(|p| p.is_file()).or_else(|| {
+        let files: Vec<PathBuf> = fs::read_dir(&bin).ok()?.flatten().map(|e| e.path()).collect();
+        (files.len() == 1).then(|| files[0].clone())
+    });
+    exe.ok_or_else(|| IdeError::new(ErrorKind::Protocol, format!("{spec} installed no command named {name}")))
+}
+
+/// Deletes a registry agent's file and installed files.
+pub fn remove(paths: &RegistryPaths, id: &str) -> IdeResult<()> {
+    if !safe_segment(id) {
+        return Err(IdeError::invalid(format!("invalid agent id {id}")));
+    }
+    let file = paths.agent_file(id);
+    let agent = CustomAgent::read(&file).map_err(|_| IdeError::not_found(format!("{id} is not installed")))?;
+    if agent.registry.is_none() {
+        return Err(IdeError::invalid(format!("{id} was not installed from the ACP Registry")));
+    }
+    fs::remove_file(&file)?;
+    // What a running agent still holds open (Windows) goes at the next start (`maintain`).
+    let _ = fs::remove_dir_all(paths.tools_dir.join(id));
+    Ok(())
+}
+
+/// Once per process, on its own thread: removes installed versions no agent file uses
+/// (left by updates and removals) and refreshes a saved index older than a day.
+pub fn maintain(paths: RegistryPaths) {
+    static ONCE: std::sync::Once = std::sync::Once::new();
+    ONCE.call_once(|| {
+        let spawned = std::thread::Builder::new().name("agent-registry".into()).spawn(move || {
+            prune(&paths);
+            let stale = fs::metadata(&paths.cache_file)
+                .and_then(|m| m.modified())
+                .ok()
+                .and_then(|t| t.elapsed().ok())
+                .is_none_or(|age| age > REFRESH_AFTER);
+            // Only for agents installed from the registry: nobody else needs the index.
+            if stale
+                && has_registry_agents(&paths)
+                && let Err(e) = fetch(&paths, &CancellationToken::new())
+            {
+                tracing::debug!("ACP Registry not refreshed: {e}");
+            }
+        });
+        if let Err(e) = spawned {
+            tracing::warn!("cannot start the ACP Registry maintenance: {e}");
+        }
+    });
+}
+
+fn has_registry_agents(paths: &RegistryPaths) -> bool {
+    fs::read_dir(&paths.tools_dir).is_ok_and(|mut d| d.next().is_some())
+}
+
+fn prune(paths: &RegistryPaths) {
+    let Ok(ids) = fs::read_dir(&paths.tools_dir) else { return };
+    for id_dir in ids.flatten() {
+        let id = id_dir.file_name().to_string_lossy().into_owned();
+        let file = paths.agent_file(&id);
+        let keep = if file.exists() {
+            // An agent file that does not parse keeps everything until it is fixed.
+            match CustomAgent::read(&file) {
+                Ok(agent) => agent.registry.map(|r| r.version),
+                Err(_) => continue,
+            }
+        } else {
+            None
+        };
+        let Some(keep) = keep else {
+            let _ = fs::remove_dir_all(id_dir.path());
+            continue;
+        };
+        for version in fs::read_dir(id_dir.path()).into_iter().flatten().flatten() {
+            if version.file_name().to_string_lossy() != keep {
+                let _ = fs::remove_dir_all(version.path());
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const MAC_ARM: Platform = Platform { os: Os::Mac, arch: Arch::Arm64 };
+    const LINUX: Platform = Platform { os: Os::Linux, arch: Arch::X64 };
+    const WINDOWS: Platform = Platform { os: Os::Windows, arch: Arch::X64 };
+
+    #[test]
+    fn windows_arm_binary_prefers_native_then_x64() {
+        let mut entry = parse(INDEX).unwrap().remove(0);
+        let arm = Platform { os: Os::Windows, arch: Arch::Arm64 };
+        assert!(matches!(choose(&entry, arm, &|_| false), Some(Choice::Binary(_))));
+        assert!(choose(&entry, Platform { os: Os::Linux, arch: Arch::Arm64 }, &|_| false).is_none());
+        entry.distribution.npx = Some(serde_json::from_str(r#"{"package":"amp-acp"}"#).unwrap());
+        assert!(matches!(choose(&entry, arm, &|_| true), Some(Choice::Npx(_))));
+        let mut native = entry.distribution.binary["windows-x86_64"].clone();
+        native.cmd = "native.exe".into();
+        entry.distribution.binary.insert("windows-aarch64".into(), native);
+        assert!(matches!(choose(&entry, arm, &|_| false), Some(Choice::Binary(b)) if b.cmd == "native.exe"));
+    }
+
+    const INDEX: &str = r#"{"version":"1.0.0","agents":[
+        {"id":"amp-acp","name":"Amp","version":"0.10.0","description":"Amp over ACP",
+         "repository":"https://github.com/x/amp-acp","authors":["x"],"license":"Apache-2.0",
+         "icon":"https://cdn/amp.svg",
+         "distribution":{"binary":{
+            "darwin-aarch64":{"archive":"https://x/amp-darwin-aarch64.tar.gz","cmd":"./amp-acp","sha256":"ab"},
+            "windows-x86_64":{"archive":"https://x/amp.zip","cmd":"amp-acp.exe"}}}},
+        {"id":"cline","name":"Cline","version":"3.0.74","description":"",
+         "distribution":{"npx":{"package":"[email protected]","args":["--acp"]}}},
+        {"id":"fast-agent","name":"fast-agent","version":"0.10.1",
+         "distribution":{"uvx":{"package":"fast-agent-acp==0.10.1","args":["-x"],"env":{"K":"v"}}}},
+        {"id":"claude-acp","name":"Claude Agent","version":"0.98.0",
+         "distribution":{"npx":{"package":"@agentclientprotocol/[email protected]"}}},
+        {"id":"../evil","name":"Evil","version":"1","distribution":{}},
+        {"id":"broken","name":"Broken"}
+    ],"extensions":[]}"#;
+
+    fn paths(root: &Path) -> RegistryPaths {
+        RegistryPaths::new(&root.join("config"), &root.join("data"))
+    }
+
+    #[test]
+    fn parses_the_index_and_skips_bad_entries() {
+        let entries = parse(INDEX).unwrap();
+        let ids: Vec<&str> = entries.iter().map(|e| e.id.as_str()).collect();
+        assert_eq!(ids, ["amp-acp", "cline", "fast-agent", "claude-acp"]);
+        let amp = &entries[0];
+        assert_eq!(amp.distribution.binary["darwin-aarch64"].sha256.as_deref(), Some("ab"));
+        assert_eq!(entries[2].distribution.uvx.as_ref().unwrap().env["K"], "v");
+        assert!(parse("{\"agents\": 3}").is_err());
+    }
+
+    #[test]
+    fn shows_what_this_platform_can_run() {
+        let dir = tempfile::tempdir().unwrap();
+        let entries = parse(INDEX).unwrap();
+        let ids = |platform, on_path: &dyn Fn(&str) -> bool| -> Vec<(String, Option<RegistryDistribution>)> {
+            visible(&paths(dir.path()), &entries, platform, on_path)
+                .into_iter()
+                .map(|a| (a.id, a.distribution))
+                .collect()
+        };
+        let none = |_: &str| false;
+        let all = |_: &str| true;
+        // Built-in agents (claude-acp) never show.
+        assert_eq!(ids(MAC_ARM, &none), [("amp-acp".to_owned(), Some(RegistryDistribution::Binary))]);
+        assert!(ids(LINUX, &none).is_empty());
+        let node_only = |c: &str| c == "npm" || c == "node";
+        assert_eq!(ids(LINUX, &node_only), [("cline".to_owned(), Some(RegistryDistribution::Npx))]);
+        assert_eq!(
+            ids(LINUX, &all),
+            [
+                ("cline".to_owned(), Some(RegistryDistribution::Npx)),
+                ("fast-agent".to_owned(), Some(RegistryDistribution::Uvx))
+            ]
+        );
+        assert_eq!(platform_key(WINDOWS), "windows-x86_64");
+        assert_eq!(platform_key(MAC_ARM), "darwin-aarch64");
+    }
+
+    #[test]
+    fn flags_release_archives_without_a_checksum() {
+        let dir = tempfile::tempdir().unwrap();
+        let entries = parse(INDEX).unwrap();
+        let flags = |platform| -> Vec<(String, bool)> {
+            visible(&paths(dir.path()), &entries, platform, &|_| true)
+                .into_iter()
+                .map(|a| (a.id, a.no_checksum))
+                .collect()
+        };
+        assert_eq!(flags(MAC_ARM)[0], ("amp-acp".to_owned(), false));
+        assert_eq!(flags(WINDOWS)[0], ("amp-acp".to_owned(), true));
+        // npm and uv check their own packages.
+        assert!(flags(LINUX).iter().all(|(_, no_checksum)| !no_checksum));
+    }
+
+    #[test]
+    fn installed_versions_updates_and_the_users_own_agents() {
+        let dir = tempfile::tempdir().unwrap();
+        let p = paths(dir.path());
+        let entries = parse(INDEX).unwrap();
+        let installed = |id: &str, version: &str| CustomAgent {
+            name: None,
+            driver: Driver::Acp,
+            command: "/x".into(),
+            args: vec![],
+            env: BTreeMap::new(),
+            registry: Some(RegistryRef { id: id.into(), version: version.into() }),
+        };
+        installed("amp-acp", "0.9.0").write(&p.agent_file("amp-acp")).unwrap();
+        // The user's own `cline.toml` hides the registry's cline.
+        fs::write(p.agent_file("cline"), "command = \"cline\"\n").unwrap();
+        let shown = visible(&p, &entries, LINUX, &|_| true);
+        let amp = shown.iter().find(|a| a.id == "amp-acp").unwrap();
+        // Installed agents stay listed (to remove them) even without a build for this system.
+        assert_eq!((amp.installed.as_deref(), amp.update, amp.distribution), (Some("0.9.0"), true, None));
+        assert!(!shown.iter().any(|a| a.id == "cline"));
+
+        write_atomic(&p.cache_file, INDEX.as_bytes()).unwrap();
+        let mut providers: Vec<AgentProvider> = provider::load(Some(&p.agents_dir))
+            .into_iter()
+            .filter(|s| s.id == "amp-acp")
+            .map(|s| AgentProvider {
+                id: s.id,
+                name: s.name,
+                command: s.command,
+                installed: false,
+                config: vec![],
+                commands: vec![],
+                source: s.source,
+            })
+            .collect();
+        mark_updates(&p, &mut providers);
+        assert_eq!(
+            providers[0].source,
+            AgentSource::Registry { version: "0.9.0".into(), update: Some("0.10.0".into()) }
+        );
+    }
+
+    #[test]
+    fn version_order() {
+        assert!(is_newer("0.10.0", "0.9.2"));
+        assert!(is_newer("1.0.0", "1.0.0-beta.1"));
+        assert!(!is_newer("1.0.0-beta.1", "1.0.0"));
+        assert!(!is_newer("2.3.0", "2.3.0"));
+        assert!(is_newer("2026.10.22", "2026.9.30"));
+    }
+
+    #[test]
+    fn package_specs_and_commands() {
+        assert_eq!(split_npm_spec("@scope/[email protected]"), ("@scope/pkg", Some("1.2.3")));
+        assert_eq!(split_npm_spec("[email protected]"), ("cline", Some("3.0.74")));
+        assert_eq!(split_npm_spec("@scope/pkg"), ("@scope/pkg", None));
+        assert_eq!(split_uv_spec("fast-agent-acp[all]==0.10.1"), ("fast-agent-acp", Some("0.10.1")));
+        let m = |v: &str| serde_json::from_str::<serde_json::Value>(v).unwrap();
+        assert_eq!(npm_bin(&m(r#"{"bin":"cli.js"}"#), "@google/gemini-cli", "gemini").as_deref(), Some("gemini-cli"));
+        assert_eq!(npm_bin(&m(r#"{"bin":{"copilot":"a.js"}}"#), "@github/copilot", "x").as_deref(), Some("copilot"));
+        assert_eq!(npm_bin(&m(r#"{"bin":{"a":"a.js","droid":"d.js"}}"#), "droid", "factory").as_deref(), Some("droid"));
+        assert_eq!(npm_bin(&m(r#"{"bin":{"a":"a.js","b":"b.js"}}"#), "pkg", "id"), None);
+        assert_eq!(npm_bin(&m(r#"{}"#), "pkg", "id"), None);
+        assert_eq!(command_path("./dist-package\\cursor-agent.cmd").unwrap(), ["dist-package", "cursor-agent.cmd"]);
+        assert_eq!(command_path("harn.exe").unwrap(), ["harn.exe"]);
+        assert!(command_path("../x").is_err());
+        assert!(command_path("/usr/bin/x").is_err());
+        assert!(command_path("C:/x").is_err());
+        assert!(check_spec("[email protected]").is_ok());
+        assert!(check_spec("--prefix=/").is_err());
+        assert!(check_spec("a b").is_err());
+        assert!(check_url("https://x/a.tar.gz").is_ok());
+        assert!(check_url("http://x/a.tar.gz").is_err());
+        assert!(check_url("ftp://x/a").is_err());
+    }
+
+    #[test]
+    fn checksums_are_verified() {
+        let dir = tempfile::tempdir().unwrap();
+        let f = dir.path().join("a");
+        fs::write(&f, "hello").unwrap();
+        let sha = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824";
+        verify_sha256(&f, sha).unwrap();
+        verify_sha256(&f, &sha.to_uppercase()).unwrap();
+        assert!(verify_sha256(&f, &"0".repeat(64)).is_err());
+    }
+
+    /// A raw executable served over `file://` (curl), installed, updated and removed.
+    #[cfg(unix)]
+    #[test]
+    fn installs_updates_and_removes_a_binary_agent() {
+        let dir = tempfile::tempdir().unwrap();
+        let p = paths(dir.path());
+        let served = dir.path().join("served");
+        fs::create_dir_all(&served).unwrap();
+        let exe = served.join("agent-bin");
+        fs::write(&exe, "#!/bin/sh\necho hi\n").unwrap();
+        let sha = ide_tools::sources::sha256_file(&exe).unwrap();
+        let index = |version: &str, sha: &str| {
+            format!(
+                r#"{{"agents":[{{"id":"demo","name":"Demo","version":"{version}","distribution":{{"binary":{{
+                "linux-x86_64":{{"archive":"file://{}","cmd":"./agent-bin","args":["acp"],"env":{{"A":"1"}},"sha256":"{sha}"}}}}}}}}]}}"#,
+                exe.display()
+            )
+        };
+        let cancel = CancellationToken::new();
+        let lines = std::sync::Mutex::new(Vec::new());
+        let emit = |e: InstallEvent| {
+            if let InstallEvent::Line { text } = e {
+                lines.lock().unwrap().push(text);
+            }
+        };
+        let entries = parse(&index("1.0.0", &sha)).unwrap();
+        install_entry(&p, &entries[0], LINUX, &|_| false, &cancel, &emit).unwrap();
+        assert!(lines.lock().unwrap().iter().any(|l| l == "SHA-256 checksum verified"));
+        let v1 = p.tools_dir.join("demo/1.0.0/agent-bin");
+        assert!(v1.is_file());
+        assert!(!p.tools_dir.join("demo/1.0.0/.download").exists());
+        let agent = CustomAgent::read(&p.agent_file("demo")).unwrap();
+        assert_eq!(agent.command, v1.to_string_lossy());
+        assert_eq!((agent.args.as_slice(), agent.env["A"].as_str()), (&["acp".to_owned()][..], "1"));
+        assert_eq!(agent.registry, Some(RegistryRef { id: "demo".into(), version: "1.0.0".into() }));
+        let spec = provider::load(Some(&p.agents_dir)).into_iter().find(|s| s.id == "demo").unwrap();
+        assert_eq!(spec.source, AgentSource::Registry { version: "1.0.0".into(), update: None });
+        assert!(provider::installed(&spec.command));
+
+        // A bad checksum fails and leaves the installed version in place.
+        let bad = parse(&index("2.0.0", &"0".repeat(64))).unwrap();
+        let err = install_entry(&p, &bad[0], LINUX, &|_| false, &cancel, &emit).unwrap_err();
+        assert!(err.message.contains("checksum mismatch"), "{err:?}");
+        assert!(!p.tools_dir.join("demo/2.0.0").exists());
+        assert_eq!(CustomAgent::read(&p.agent_file("demo")).unwrap().registry.unwrap().version, "1.0.0");
+
+        // An update goes alongside; the old version goes at the next start.
+        let v2 = parse(&index("2.0.0", &sha)).unwrap();
+        install_entry(&p, &v2[0], LINUX, &|_| false, &cancel, &emit).unwrap();
+        assert!(v1.is_file());
+        prune(&p);
+        assert!(!v1.exists());
+        assert!(p.tools_dir.join("demo/2.0.0/agent-bin").is_file());
+
+        remove(&p, "demo").unwrap();
+        assert!(!p.agent_file("demo").exists());
+        assert!(!p.tools_dir.join("demo").exists());
+        assert!(remove(&p, "demo").is_err());
+    }
+
+    #[test]
+    fn refuses_to_replace_the_users_own_agent() {
+        let dir = tempfile::tempdir().unwrap();
+        let p = paths(dir.path());
+        fs::create_dir_all(&p.agents_dir).unwrap();
+        fs::write(p.agent_file("amp-acp"), "command = \"amp\"\n").unwrap();
+        let entries = parse(INDEX).unwrap();
+        let err = install_entry(&p, &entries[0], MAC_ARM, &|_| false, &CancellationToken::new(), &|_| {}).unwrap_err();
+        assert_eq!(err.kind, ErrorKind::AlreadyExists);
+        assert!(remove(&p, "amp-acp").is_err());
+        assert!(p.agent_file("amp-acp").exists());
+    }
+}

crates/ide-agent/src/replay.rs

@@ -0,0 +1,273 @@
+//! Recorded agent transcripts, replayed through the real task machinery.
+//!
+//! A fixture is a JSONL file of the frames one agent connection carried, in order:
+//! `{"from":"client"|"agent","msg":{…}}`. Recording runs a scenario against the real
+//! agent and saves what went over its stdio; replaying plays the agent's side back,
+//! waiting for each client frame before it sends what followed it. Client frames are
+//! matched by kind and method, not content (prompts carry temp paths and timestamps), and
+//! may arrive out of their recorded order when they race (a stop and an answer).
+
+use crate::Connector;
+use ide_jsonrpc::{Framing, Peer};
+use parking_lot::Mutex;
+use serde_json::{Value, json};
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+use std::time::Duration;
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+
+/// How long a replay waits for a client frame before giving up.
+const CLIENT_WAIT: Duration = Duration::from_secs(10);
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub(crate) enum From {
+    Client,
+    Agent,
+}
+
+#[derive(Clone, Debug)]
+pub(crate) struct Frame {
+    pub from: From,
+    pub msg: Value,
+}
+
+pub(crate) fn load(path: &Path) -> Vec<Vec<Frame>> {
+    let text = std::fs::read_to_string(path).unwrap_or_else(|e| panic!("{}: {e}", path.display()));
+    let mut connections: Vec<Vec<Frame>> = Vec::new();
+    for line in text.lines().filter(|l| !l.trim().is_empty()) {
+        let v: Value = serde_json::from_str(line).unwrap();
+        // `{"connection": n}` starts the frames of the n-th agent process.
+        if v.get("connection").is_some() {
+            connections.push(Vec::new());
+            continue;
+        }
+        let from = match v["from"].as_str() {
+            Some("client") => From::Client,
+            _ => From::Agent,
+        };
+        if connections.is_empty() {
+            connections.push(Vec::new());
+        }
+        connections.last_mut().unwrap().push(Frame { from, msg: v["msg"].clone() });
+    }
+    connections
+}
+
+fn kind(msg: &Value) -> (&'static str, String) {
+    let method = msg.get("method").and_then(Value::as_str).unwrap_or_default().to_owned();
+    match (msg.get("id").is_some(), msg.get("method").is_some()) {
+        (true, true) => ("request", method),
+        (false, true) => ("notification", method),
+        _ => ("response", String::new()),
+    }
+}
+
+/// What went wrong in a replay, for the test to assert on.
+#[derive(Default)]
+pub(crate) struct Report {
+    pub problems: Vec<String>,
+    /// Client methods the replay saw, in order.
+    pub calls: Vec<String>,
+}
+
+/// Plays one recorded connection's agent side over `stream`.
+async fn play(frames: Vec<Frame>, stream: tokio::io::DuplexStream, report: Arc<Mutex<Report>>) {
+    let (read, mut write) = tokio::io::split(stream);
+    let mut lines = BufReader::new(read).lines();
+    // Recorded request id → the id the client used this time.
+    let mut ids: HashMap<String, Value> = HashMap::new();
+    let mut early: Vec<Value> = Vec::new();
+    for frame in frames {
+        match frame.from {
+            From::Agent => {
+                let mut msg = frame.msg;
+                if kind(&msg).0 == "response"
+                    && let Some(actual) = msg.get("id").and_then(|id| ids.get(&id.to_string()))
+                {
+                    msg["id"] = actual.clone();
+                }
+                let mut line = msg.to_string();
+                line.push('\n');
+                if write.write_all(line.as_bytes()).await.is_err() {
+                    return;
+                }
+            }
+            From::Client => {
+                let want = kind(&frame.msg);
+                let found = match early.iter().position(|m| kind(m) == want) {
+                    Some(i) => Some(early.remove(i)),
+                    None => loop {
+                        let next = tokio::time::timeout(CLIENT_WAIT, lines.next_line()).await;
+                        let Ok(Ok(Some(line))) = next else { break None };
+                        let Ok(msg) = serde_json::from_str::<Value>(&line) else { continue };
+                        if msg.get("method").and_then(Value::as_str) == Some("$/cancelRequest") {
+                            continue;
+                        }
+                        report.lock().calls.push(kind(&msg).1);
+                        if kind(&msg) == want {
+                            break Some(msg);
+                        }
+                        early.push(msg);
+                    },
+                };
+                let Some(msg) = found else {
+                    report.lock().problems.push(format!("the client never sent {want:?}"));
+                    return;
+                };
+                if let (Some(recorded), Some(actual)) = (frame.msg.get("id"), msg.get("id"))
+                    && want.0 == "request"
+                {
+                    ids.insert(recorded.to_string(), actual.clone());
+                }
+            }
+        }
+    }
+    // The transcript is over: requests beyond it are a client behaving differently.
+    let leftovers = early.into_iter().filter(|m| kind(m).0 == "request");
+    report.lock().problems.extend(leftovers.map(|m| format!("unexpected {}", kind(&m).1)));
+    while let Ok(Some(line)) = lines.next_line().await {
+        if let Ok(msg) = serde_json::from_str::<Value>(&line) {
+            let (k, method) = kind(&msg);
+            if k != "response" && method != "$/cancelRequest" {
+                report.lock().calls.push(method.clone());
+            }
+            if k == "request" {
+                report.lock().problems.push(format!("unexpected {method}"));
+                let reply = json!({ "jsonrpc": "2.0", "id": msg["id"], "error": { "code": -32601, "message": "not recorded" } });
+                let _ = write.write_all(format!("{reply}\n").as_bytes()).await;
+            }
+        }
+    }
+}
+
+/// Serves the fixture's connections in order, one per agent start.
+pub(crate) fn replayer(path: &Path) -> (Connector, Arc<Mutex<Report>>) {
+    let connections = Arc::new(Mutex::new(load(path).into_iter()));
+    let report = Arc::new(Mutex::new(Report::default()));
+    let rep = report.clone();
+    let connector: Connector = Arc::new(move |_spec, _cwd, client, _stderr| {
+        let frames = connections.lock().next().ok_or_else(|| std::io::Error::other("no more recorded connections"))?;
+        let (ours, theirs) = tokio::io::duplex(1 << 20);
+        tokio::spawn(play(frames, theirs, rep.clone()));
+        let (r, w) = tokio::io::split(ours);
+        Ok(Peer::connect_framed(r, w, client, Framing::Lines))
+    });
+    (connector, report)
+}
+
+/// Removes who the user is (account e-mail, organisation) from a recorded frame.
+fn scrub(v: &mut Value) {
+    match v {
+        Value::Object(map) => {
+            for (k, v) in map.iter_mut() {
+                if matches!(k.as_str(), "email" | "organization" | "organizationName" | "accountUuid" | "account_id") {
+                    *v = json!("redacted");
+                } else if k == "availableCommands"
+                    && let Some(list) = v.as_array_mut()
+                {
+                    // The user's own skills and plugins: a few are enough.
+                    list.truncate(3);
+                    list.iter_mut().for_each(scrub);
+                } else {
+                    scrub(v);
+                }
+            }
+        }
+        Value::Array(items) => items.iter_mut().for_each(scrub),
+        Value::String(s) if s.contains('@') && s.contains('.') && !s.contains(' ') => *s = "redacted".into(),
+        _ => {}
+    }
+}
+
+/// Runs the real agent, saving every frame of every connection to `out`.
+pub(crate) fn recorder(out: PathBuf) -> Connector {
+    let file = Arc::new(Mutex::new(String::new()));
+    let connections = Arc::new(Mutex::new(0u32));
+    Arc::new(move |spec, cwd, client, on_stderr| {
+        let program = {
+            let path = Path::new(&spec.command);
+            if path.components().count() > 1 || path.is_absolute() {
+                path.to_path_buf()
+            } else {
+                let search = spec
+                    .env
+                    .iter()
+                    .find(|(k, _)| k.eq_ignore_ascii_case("PATH"))
+                    .map(|(_, v)| std::ffi::OsString::from(v))
+                    .or_else(|| ide_core::process::shell_env().find(|(k, _)| k == "PATH").map(|(_, v)| v))
+                    .or_else(|| ide_core::process::host_var_os("PATH"))
+                    .unwrap_or_default();
+                ide_core::process::find_executable(&spec.command, &search).unwrap_or_else(|| path.to_path_buf())
+            }
+        };
+        let mut cmd = tokio::process::Command::new(&program);
+        ide_core::process::prepare(cmd.as_std_mut());
+        let mut child = cmd
+            .args(&spec.args)
+            .current_dir(cwd)
+            .envs(ide_core::process::shell_env())
+            .envs(spec.env.iter().map(|(k, v)| (k.as_str(), v.as_str())))
+            .stdin(std::process::Stdio::piped())
+            .stdout(std::process::Stdio::piped())
+            .stderr(std::process::Stdio::piped())
+            .kill_on_drop(true)
+            .spawn()?;
+        let (stdin, stdout, stderr) = (child.stdin.take().unwrap(), child.stdout.take().unwrap(), child.stderr.take());
+        let n = {
+            let mut c = connections.lock();
+            *c += 1;
+            *c
+        };
+        let save = {
+            let (file, out) = (file.clone(), out.clone());
+            move |from: &str, mut msg: Value| {
+                scrub(&mut msg);
+                let line = json!({ "from": from, "msg": msg }).to_string();
+                let mut f = file.lock();
+                f.push_str(&line);
+                f.push('\n');
+                if let Some(dir) = out.parent() {
+                    let _ = std::fs::create_dir_all(dir);
+                }
+                let _ = std::fs::write(&out, f.as_bytes());
+            }
+        };
+        {
+            let mut f = file.lock();
+            f.push_str(&format!("{}\n", json!({ "connection": n })));
+        }
+        let (ours, theirs) = tokio::io::duplex(1 << 20);
+        let (tr, mut tw) = tokio::io::split(theirs);
+        let to_agent = save.clone();
+        tokio::spawn(async move {
+            let mut stdin = stdin;
+            let mut lines = BufReader::new(tr).lines();
+            while let Ok(Some(line)) = lines.next_line().await {
+                if let Ok(msg) = serde_json::from_str::<Value>(&line) {
+                    to_agent("client", msg);
+                }
+                if stdin.write_all(format!("{line}\n").as_bytes()).await.is_err() {
+                    break;
+                }
+            }
+            drop(stdin);
+            let _ = child.kill().await;
+        });
+        tokio::spawn(async move {
+            let mut lines = BufReader::new(stdout).lines();
+            while let Ok(Some(line)) = lines.next_line().await {
+                let Ok(msg) = serde_json::from_str::<Value>(&line) else { continue };
+                save("agent", msg);
+                if tw.write_all(format!("{line}\n").as_bytes()).await.is_err() {
+                    break;
+                }
+            }
+        });
+        if let Some(stderr) = stderr {
+            tokio::spawn(ide_jsonrpc::output::read_lines(stderr, on_stderr));
+        }
+        let (r, w) = tokio::io::split(ours);
+        Ok(Peer::connect_framed(r, w, client, Framing::Lines))
+    })
+}

crates/ide-agent/src/replay_tests.rs

@@ -0,0 +1,223 @@
+//! Shared scenarios, replayed from transcripts recorded with real agents.
+//!
+//! Record (spends a few cheap turns; the agent must be installed and signed in):
+//! `OPENIDEA_RECORD=claude-acp@v2 cargo test -p ide-agent replay_tests::record -- --ignored`
+//! writes `tests/fixtures/acp/<agent>[@<variant>]/<scenario>.jsonl`; the variant only
+//! names the setup (`claude-acp@v1` ran with `CLAUDE_AGENT_ACP_EXPERIMENTAL_V2=0`). Every fixture found is replayed
+//! by `recorded_scenarios`.
+
+use super::*;
+use crate::replay::{Report, recorder, replayer};
+
+const SCENARIOS: [&str; 7] =
+    ["simple", "multi_turn", "queued_turn", "turn_interrupt", "permission_allow", "permission_decline", "resume"];
+
+fn fixtures() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/acp")
+}
+
+fn paths(dir: &Path) -> AgentPaths {
+    AgentPaths {
+        project_root: dir.to_path_buf(),
+        store_dir: dir.join("store"),
+        worktrees_dir: dir.join("worktrees"),
+        models_file: dir.join("models.json"),
+        custom_agents_dir: None,
+        home_dir: None,
+    }
+}
+
+fn text(t: &str) -> AgentPrompt {
+    AgentPrompt { text: t.into(), ..Default::default() }
+}
+
+/// Waits until the task settles (or asks for permission), up to `secs`.
+async fn settle(mgr: &AgentManager, id: &str, secs: u64) -> AgentStatus {
+    let deadline = std::time::Instant::now() + Duration::from_secs(secs);
+    loop {
+        let task = mgr.task(id).unwrap();
+        let (s, busy) = {
+            let st = task.state.lock();
+            (st.task.status, st.busy)
+        };
+        if s == AgentStatus::NeedsInput || (!busy && s != AgentStatus::Starting && s != AgentStatus::Running) {
+            return s;
+        }
+        assert!(std::time::Instant::now() < deadline, "task stuck in {s:?}");
+        tokio::time::sleep(Duration::from_millis(20)).await;
+    }
+}
+
+/// Settings every scenario of `provider` starts with (`<agent>/config.json`): a cheap model.
+fn config(provider: &str) -> Vec<AgentConfigChoice> {
+    let path = fixtures().join(provider.split('@').next().unwrap_or_default()).join("config.json");
+    std::fs::read(path).ok().and_then(|b| serde_json::from_slice(&b).ok()).unwrap_or_default()
+}
+
+async fn create(mgr: &AgentManager, provider: &str, prompt: &str) -> String {
+    let req = NewAgentTask {
+        project_root: None,
+        prompt: text(prompt),
+        provider: provider.into(),
+        config: config(provider),
+        isolation: Isolation::Local,
+        base: None,
+    };
+    mgr.create(req).await.unwrap().id
+}
+
+fn permission(mgr: &AgentManager, id: &str) -> Option<(u32, Vec<AgentPermissionOption>)> {
+    mgr.entries(id, None).unwrap().into_iter().rev().find_map(|e| match e {
+        AgentEntry::Permission { id, options, chosen: None, .. } => Some((id, options)),
+        _ => None,
+    })
+}
+
+/// Answers permission requests with the first option of `kind` (`allow` / `reject`) until the task settles.
+async fn answer_all(mgr: &AgentManager, id: &str, kind: &str, secs: u64) -> AgentStatus {
+    loop {
+        let s = settle(mgr, id, secs).await;
+        if s != AgentStatus::NeedsInput {
+            return s;
+        }
+        let (request, options) = permission(mgr, id).expect("a pending permission");
+        let option = options.iter().find(|o| o.kind.starts_with(kind)).map(|o| o.id.clone());
+        mgr.respond(id, request, option).unwrap();
+    }
+}
+
+fn agent_text(mgr: &AgentManager, id: &str) -> String {
+    mgr.entries(id, None)
+        .unwrap()
+        .into_iter()
+        .filter_map(|e| match e {
+            AgentEntry::Agent { text } => Some(text),
+            _ => None,
+        })
+        .collect::<Vec<_>>()
+        .join("\n")
+}
+
+fn errors(mgr: &AgentManager, id: &str) -> Vec<String> {
+    mgr.entries(id, None)
+        .unwrap()
+        .into_iter()
+        .filter_map(|e| match e {
+            AgentEntry::Error { message } => Some(message),
+            _ => None,
+        })
+        .collect()
+}
+
+fn turns(mgr: &AgentManager, id: &str) -> usize {
+    turn_starts(&mgr.entries(id, None).unwrap()).len()
+}
+
+/// Runs `scenario` on a fresh manager per agent connection, asserting what holds for any agent.
+async fn run(scenario: &str, provider: &str, dir: &Path, connector: Connector, secs: u64) {
+    let mgr = AgentManager::with_connector(paths(dir), tokio::runtime::Handle::current(), connector.clone());
+    match scenario {
+        "simple" => {
+            let id = create(&mgr, provider, "Reply with just the word: pong").await;
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            assert!(agent_text(&mgr, &id).to_lowercase().contains("pong"));
+            assert!(errors(&mgr, &id).is_empty());
+        }
+        "multi_turn" => {
+            let id = create(&mgr, provider, "Remember the number 7. Reply with just: OK").await;
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            mgr.prompt(&id, text("Which number did I ask you to remember? Reply with just the number."), false)
+                .await
+                .unwrap();
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            assert_eq!(turns(&mgr, &id), 2);
+            assert!(agent_text(&mgr, &id).contains('7'));
+        }
+        "queued_turn" => {
+            let id = create(&mgr, provider, "Reply with just the word: one").await;
+            mgr.prompt(&id, text("Reply with just the word: two"), false).await.unwrap();
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            assert_eq!(turns(&mgr, &id), 2);
+            assert!(mgr.task(&id).unwrap().state.lock().task.queue.is_empty());
+        }
+        "turn_interrupt" => {
+            let id = create(&mgr, provider, "Count from 1 to 300, one number per line, nothing else.").await;
+            // Stopped before the agent has even started: the turn must still end, cleanly.
+            mgr.cancel(&id, None).unwrap();
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            assert!(errors(&mgr, &id).is_empty(), "{:?}", errors(&mgr, &id));
+            assert!(!agent_text(&mgr, &id).contains("300"));
+        }
+        "permission_allow" | "permission_decline" => {
+            let id =
+                create(&mgr, provider, "Use your shell tool to run exactly this command: echo openidea-replay").await;
+            let kind = if scenario == "permission_allow" { "allow" } else { "reject" };
+            assert_eq!(answer_all(&mgr, &id, kind, secs).await, AgentStatus::Ready);
+            let entries = mgr.entries(&id, None).unwrap();
+            assert!(entries.iter().all(|e| !matches!(e, AgentEntry::Permission { chosen: None, .. })));
+            assert!(entries.iter().any(|e| matches!(e, AgentEntry::Tool { .. })));
+        }
+        "resume" => {
+            let id = create(&mgr, provider, "Remember the word: walnut. Reply with just: OK").await;
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            mgr.shutdown();
+            drop(mgr);
+            // A restart: the session is loaded again, its history not duplicated.
+            let mgr = AgentManager::with_connector(paths(dir), tokio::runtime::Handle::current(), connector);
+            mgr.prompt(&id, text("Which word did I ask you to remember? Reply with just the word."), false)
+                .await
+                .unwrap();
+            assert_eq!(answer_all(&mgr, &id, "reject", secs).await, AgentStatus::Ready);
+            assert_eq!(turns(&mgr, &id), 2);
+            assert!(agent_text(&mgr, &id).to_lowercase().contains("walnut"));
+            mgr.shutdown();
+            return;
+        }
+        other => panic!("unknown scenario {other}"),
+    }
+    mgr.shutdown();
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn recorded_scenarios() {
+    let mut ran = 0;
+    for agent in std::fs::read_dir(fixtures()).into_iter().flatten().flatten() {
+        // `<provider>[@<variant>]`: one agent recorded in several setups (ACP v1 and v2).
+        let name = agent.file_name().to_string_lossy().into_owned();
+        let provider = name.split('@').next().unwrap_or_default().to_owned();
+        for scenario in SCENARIOS {
+            let fixture = agent.path().join(format!("{scenario}.jsonl"));
+            if !fixture.exists() {
+                continue;
+            }
+            let tmp = tempfile::tempdir().unwrap();
+            let (connector, report) = replayer(&fixture);
+            run(scenario, &provider, tmp.path(), connector, 20).await;
+            let provider = &name;
+            let Report { problems, calls } = std::mem::take(&mut *report.lock());
+            assert!(problems.is_empty(), "{provider}/{scenario}: {problems:?} (calls {calls:?})");
+            if scenario == "resume" {
+                assert!(
+                    calls.iter().any(|c| c == "session/load" || c == "session/resume"),
+                    "{provider}: resume didn't load the session"
+                );
+            }
+            ran += 1;
+        }
+    }
+    assert!(ran > 0, "no recorded fixtures under {}", fixtures().display());
+}
+
+#[tokio::test(flavor = "multi_thread")]
+#[ignore = "runs a real agent: OPENIDEA_RECORD=<provider id> [OPENIDEA_SCENARIO=<name>]"]
+async fn record() {
+    let name = std::env::var("OPENIDEA_RECORD").expect("OPENIDEA_RECORD=<provider id>[@<variant>]");
+    let provider = name.split('@').next().unwrap_or_default().to_owned();
+    let only = std::env::var("OPENIDEA_SCENARIO").ok();
+    for scenario in SCENARIOS.iter().filter(|s| only.as_deref().is_none_or(|o| o == **s)) {
+        let tmp = tempfile::tempdir().unwrap();
+        let out = fixtures().join(&name).join(format!("{scenario}.jsonl"));
+        let _ = std::fs::remove_file(&out);
+        run(scenario, &provider, tmp.path(), recorder(out), 180).await;
+    }
+}

crates/ide-agent/src/skills.rs

@@ -0,0 +1,281 @@
+//! Claude Code's slash commands on disk, for completion before (or without) a session:
+//! skills (`.claude/skills/<dir>/SKILL.md`) and custom commands (`.claude/commands/**/*.md`)
+//! of the working directory and every directory above it, then the user's `~/.claude`.
+
+use crate::AgentCommand;
+use std::collections::HashSet;
+use std::path::Path;
+
+const MAX_DESCRIPTION: usize = 200;
+/// Command directories nest this deep at most (`a/b/c.md` → `a:b:c`).
+const MAX_DEPTH: usize = 4;
+
+/// The commands Claude Code finds from `cwd`: nearest directory first, the user's last;
+/// the first of a name wins.
+pub(crate) fn discover(cwd: &Path, home: Option<&Path>) -> Vec<AgentCommand> {
+    let mut out = Vec::new();
+    let mut seen = HashSet::new();
+    let mut add = |found: Vec<AgentCommand>| {
+        for c in found {
+            if seen.insert(c.name.clone()) {
+                out.push(c);
+            }
+        }
+    };
+    for dir in cwd.ancestors() {
+        if home.is_some_and(|h| h == dir) {
+            break;
+        }
+        add(in_dir(&dir.join(".claude")));
+    }
+    if let Some(home) = home {
+        add(in_dir(&home.join(".claude")));
+    }
+    out
+}
+
+/// `first` (the agent's own list) plus the commands of `more` it lacks.
+pub(crate) fn merge(first: Vec<AgentCommand>, more: Vec<AgentCommand>) -> Vec<AgentCommand> {
+    let names: HashSet<String> = first.iter().map(|c| c.name.clone()).collect();
+    let mut out = first;
+    out.extend(more.into_iter().filter(|c| !names.contains(&c.name)));
+    out
+}
+
+fn in_dir(claude: &Path) -> Vec<AgentCommand> {
+    if !claude.is_dir() {
+        return Vec::new();
+    }
+    let mut out = skills(&claude.join("skills"));
+    commands(&claude.join("commands"), "", 0, &mut out);
+    out
+}
+
+fn skills(dir: &Path) -> Vec<AgentCommand> {
+    let mut out: Vec<AgentCommand> = sorted(dir)
+        .into_iter()
+        .filter_map(|path| {
+            let text = std::fs::read_to_string(path.join("SKILL.md")).ok()?;
+            let meta = Frontmatter::parse(&text);
+            if meta.get("user-invocable").is_some_and(|v| v.eq_ignore_ascii_case("false")) {
+                return None;
+            }
+            let name = meta.get("name").filter(|n| !n.is_empty()).map(str::to_owned).or_else(|| file_name(&path))?;
+            Some(meta.command(name, &text))
+        })
+        .collect();
+    out.sort_by(|a, b| a.name.cmp(&b.name));
+    out
+}
+
+fn commands(dir: &Path, prefix: &str, depth: usize, out: &mut Vec<AgentCommand>) {
+    if depth > MAX_DEPTH {
+        return;
+    }
+    for path in sorted(dir) {
+        let Some(name) = file_name(&path) else { continue };
+        if path.is_dir() {
+            commands(&path, &format!("{prefix}{name}:"), depth + 1, out);
+        } else if let Some(stem) = name.strip_suffix(".md")
+            && let Ok(text) = std::fs::read_to_string(&path)
+        {
+            out.push(Frontmatter::parse(&text).command(format!("{prefix}{stem}"), &text));
+        }
+    }
+}
+
+fn sorted(dir: &Path) -> Vec<std::path::PathBuf> {
+    let mut paths: Vec<_> = std::fs::read_dir(dir)
+        .into_iter()
+        .flatten()
+        .flatten()
+        .map(|e| e.path())
+        .filter(|p| file_name(p).is_some_and(|n| !n.starts_with('.')))
+        .collect();
+    paths.sort();
+    paths
+}
+
+fn file_name(path: &Path) -> Option<String> {
+    path.file_name()?.to_str().map(str::to_owned)
+}
+
+/// The `key: value` lines between the leading `---` fences (folded `>` / `|` values joined).
+struct Frontmatter {
+    fields: Vec<(String, String)>,
+    /// Where the body starts.
+    body: usize,
+}
+
+impl Frontmatter {
+    fn parse(text: &str) -> Self {
+        let text = text.strip_prefix('\u{feff}').unwrap_or(text);
+        let mut lines = text.split_inclusive('\n');
+        let mut offset = 0;
+        let mut fields: Vec<(String, String)> = Vec::new();
+        match lines.next() {
+            Some(first) if first.trim_end() == "---" => offset += first.len(),
+            _ => return Self { fields, body: 0 },
+        }
+        for line in lines {
+            offset += line.len();
+            let line = line.trim_end();
+            if line == "---" {
+                return Self { fields, body: offset };
+            }
+            if line.starts_with([' ', '\t']) {
+                if let Some((_, value)) = fields.last_mut() {
+                    if !value.is_empty() {
+                        value.push(' ');
+                    }
+                    value.push_str(line.trim());
+                }
+                continue;
+            }
+            if let Some((key, value)) = line.split_once(':') {
+                let value = value.trim();
+                let value = if matches!(value, ">" | "|" | ">-" | "|-") { "" } else { unquote(value) };
+                fields.push((key.trim().to_owned(), value.to_owned()));
+            }
+        }
+        // No closing fence: not frontmatter.
+        Self { fields: Vec::new(), body: 0 }
+    }
+
+    fn get(&self, key: &str) -> Option<&str> {
+        self.fields.iter().find(|(k, _)| k == key).map(|(_, v)| v.as_str())
+    }
+
+    /// `description`, else the body's first line.
+    fn command(&self, name: String, text: &str) -> AgentCommand {
+        let description = self.get("description").filter(|d| !d.is_empty()).map(str::to_owned).unwrap_or_else(|| {
+            let body = text.get(self.body..).unwrap_or_default();
+            body.lines()
+                .map(|l| l.trim().trim_start_matches('#').trim())
+                .find(|l| !l.is_empty())
+                .unwrap_or_default()
+                .to_owned()
+        });
+        AgentCommand {
+            name,
+            description: truncate(&description),
+            hint: self.get("argument-hint").filter(|h| !h.is_empty()).map(str::to_owned),
+        }
+    }
+}
+
+fn unquote(value: &str) -> &str {
+    for q in ['"', '\''] {
+        if let Some(inner) = value.strip_prefix(q).and_then(|v| v.strip_suffix(q)) {
+            return inner;
+        }
+    }
+    value
+}
+
+fn truncate(s: &str) -> String {
+    match s.char_indices().nth(MAX_DESCRIPTION) {
+        Some((i, _)) => format!("{}…", s[..i].trim_end()),
+        None => s.to_owned(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn write(path: &Path, text: &str) {
+        std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+        std::fs::write(path, text).unwrap();
+    }
+
+    fn names(cmds: &[AgentCommand]) -> Vec<&str> {
+        cmds.iter().map(|c| c.name.as_str()).collect()
+    }
+
+    fn cmd(name: &str, description: &str) -> AgentCommand {
+        AgentCommand { name: name.into(), description: description.into(), hint: None }
+    }
+
+    #[test]
+    fn project_and_user_skills_and_commands() {
+        let tmp = tempfile::tempdir().unwrap();
+        let home = tmp.path().join("home");
+        let repo = tmp.path().join("work").join("idea");
+        let skills = repo.join(".claude/skills");
+        write(
+            &skills.join("triage/SKILL.md"),
+            "---\nname: triage\ndescription: One pass over open issues and PRs\n---\n# Triage\n",
+        );
+        write(&skills.join("issue-fix/SKILL.md"), "---\nname: issue-fix\ndescription: \"Fix an issue\"\n---\n");
+        // No frontmatter name: the directory's.
+        write(&skills.join("verify/SKILL.md"), "---\ndescription: >\n  Build and\n  drive the app\n---\n");
+        write(&skills.join("hidden/SKILL.md"), "---\nname: hidden\nuser-invocable: false\n---\n");
+        write(&skills.join("no-skill-file/README.md"), "nothing");
+        write(&repo.join(".claude/commands/review.md"), "---\nargument-hint: <pr>\n---\nReview a pull request\n");
+        write(&repo.join(".claude/commands/git/commit.md"), "# Commit the staged changes\n");
+        // A parent directory's commands apply too.
+        write(&tmp.path().join("work/.claude/commands/parent.md"), "---\ndescription: from above\n---\n");
+        // The user's: shadowed by the project's skill of the same name.
+        write(&home.join(".claude/skills/triage/SKILL.md"), "---\nname: triage\ndescription: user triage\n---\n");
+        write(&home.join(".claude/skills/lint/SKILL.md"), "---\nname: lint\ndescription: user lint\n---\n");
+        write(&home.join(".claude/commands/brooks-review.md"), "---\ndescription: Review\n---\n");
+
+        let found = discover(&repo, Some(&home));
+        assert_eq!(
+            names(&found),
+            ["issue-fix", "triage", "verify", "git:commit", "review", "parent", "lint", "brooks-review"]
+        );
+        let by = |n: &str| found.iter().find(|c| c.name == n).unwrap();
+        assert_eq!(by("triage").description, "One pass over open issues and PRs");
+        assert_eq!(by("issue-fix").description, "Fix an issue");
+        assert_eq!(by("verify").description, "Build and drive the app");
+        assert_eq!(by("git:commit").description, "Commit the staged changes");
+        assert_eq!(
+            (by("review").description.as_str(), by("review").hint.as_deref()),
+            ("Review a pull request", Some("<pr>"))
+        );
+    }
+
+    #[test]
+    fn nothing_without_claude_dirs() {
+        let tmp = tempfile::tempdir().unwrap();
+        let home = tmp.path().join("home");
+        let repo = home.join("plain");
+        std::fs::create_dir_all(&repo).unwrap();
+        assert!(discover(&repo, Some(&home)).is_empty());
+    }
+
+    #[test]
+    fn walking_up_stops_at_home() {
+        let tmp = tempfile::tempdir().unwrap();
+        let home = tmp.path().join("home");
+        // Above home: not the user's, and not this project's.
+        write(&tmp.path().join(".claude/commands/outside.md"), "x\n");
+        write(&home.join(".claude/commands/mine.md"), "x\n");
+        let repo = home.join("src/app");
+        std::fs::create_dir_all(&repo).unwrap();
+        assert_eq!(names(&discover(&repo, Some(&home))), ["mine"]);
+    }
+
+    #[test]
+    fn the_agents_entries_win() {
+        let merged = merge(
+            vec![cmd("triage", "from the agent"), cmd("compact", "Compact")],
+            vec![cmd("triage", "from disk"), cmd("verify", "Verify")],
+        );
+        assert_eq!(names(&merged), ["triage", "compact", "verify"]);
+        assert_eq!(merged[0].description, "from the agent");
+    }
+
+    #[test]
+    fn frontmatter_edge_cases() {
+        let f = Frontmatter::parse("no fence\n");
+        assert!(f.fields.is_empty());
+        let f = Frontmatter::parse("---\nname: x\nunterminated\n");
+        assert!(f.get("name").is_none());
+        let f = Frontmatter::parse("\u{feff}---\r\nname: 'quoted'\r\n---\r\nbody\r\n");
+        assert_eq!(f.get("name"), Some("quoted"));
+        assert_eq!(truncate(&"é".repeat(MAX_DESCRIPTION + 5)).chars().count(), MAX_DESCRIPTION + 1);
+    }
+}

crates/ide-agent/src/tests.rs

@@ -0,0 +1,944 @@
+//! End-to-end task flow against an in-memory ACP agent.
+
+use super::*;
+use tokio::io::duplex;
+
+/// Says "Hi", edits a file, asks to run a command and reports what it was allowed.
+#[derive(Default)]
+struct FakeAgent {
+    /// Every connection's agent side, kept open.
+    servers: Mutex<Vec<Peer>>,
+    calls: Mutex<Vec<String>>,
+}
+
+impl FakeAgent {
+    /// The connection opened last: the agent restarted, or a fork's.
+    fn latest(&self) -> Peer {
+        self.servers.lock().last().cloned().expect("a connection")
+    }
+
+    fn update(&self, session: &str, update: Value) {
+        let peer = self.latest();
+        peer.notify("session/update", json!({ "sessionId": session, "update": update })).unwrap();
+    }
+
+    fn say(&self, session: &str, text: &str) {
+        self.update(
+            session,
+            json!({"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": text}}),
+        );
+    }
+}
+
+impl FakeAgent {
+    /// Runs a subagent in session `c1`, as an agent with ACP subagent sessions reports it.
+    fn delegate(&self, root: &str) {
+        let sub = |state: Value| json!({"sessionUpdate": "subagent_update", "sessionId": "c1", "state": state});
+        let mut announce = sub(json!({"state": "running"}));
+        announce["title"] = json!("Explore");
+        self.update(root, announce);
+        self.update(
+            root,
+            json!({"sessionUpdate": "session_message", "messageId": "m1", "senderSessionId": root,
+                "recipientSessionId": "c1", "content": [{"type": "text", "text": "Find the lexer"}]}),
+        );
+        self.update("c1", json!({"sessionUpdate": "usage_update", "used": 900, "size": 1000}));
+        self.update(
+            "c1",
+            json!({"sessionUpdate": "tool_call", "toolCallId": "c1-t1", "title": "Read lexer.rs",
+            "kind": "read", "status": "completed"}),
+        );
+        let peer = self.latest();
+        let _: Value = tokio::runtime::Handle::current()
+            .block_on(peer.request(
+                "session/request_permission",
+                json!({"sessionId": "c1", "toolCall": {"toolCallId": "c1-t2", "title": "Run ls"},
+                    "options": [{"optionId": "yes", "name": "Allow", "kind": "allow_once"}]}),
+                None,
+            ))
+            .unwrap();
+        self.say("c1", "It is in lexer.rs");
+        self.update(root, sub(json!({"state": "idle", "stopReason": "end_turn"})));
+        self.update(
+            root,
+            json!({"sessionUpdate": "session_message", "messageId": "m2", "senderSessionId": "c1",
+                "recipientSessionId": root, "content": [{"type": "text", "text": "lexer.rs"}]}),
+        );
+        self.say(root, "Found it");
+    }
+}
+
+impl Handler for FakeAgent {
+    fn on_notification(&self, method: &str, _: Value) {
+        self.calls.lock().push(method.to_owned());
+    }
+
+    fn on_request_with_data(&self, method: &str, params: Value) -> Result<Value, (i64, String, Option<Value>)> {
+        if method == "session/prompt" && params.pointer("/prompt/0/text") == Some(&json!("limit")) {
+            let data = json!({"openidea": {"usageLimit": {"resetsAtMs": 1234.0}}});
+            return Err((codes::INTERNAL_ERROR, "You've hit your usage limit".into(), Some(data)));
+        }
+        self.on_request(method, params).map_err(|(code, message)| (code, message, None))
+    }
+
+    fn on_request(&self, method: &str, params: Value) -> Result<Value, (i64, String)> {
+        self.calls.lock().push(method.to_owned());
+        let session = params.get("sessionId").and_then(Value::as_str).unwrap_or("s1").to_owned();
+        match method {
+            "initialize" => {
+                if params.pointer("/clientCapabilities/subagents").is_some_and(Value::is_object) {
+                    self.calls.lock().push("subagents".into());
+                }
+                Ok(json!({"protocolVersion": 1, "agentCapabilities": {"loadSession": true,
+                    "sessionCapabilities": {"fork": {}}, "_meta": {"openidea": {"rollback": true, "steer": true}}}}))
+            }
+            "session/new" => Ok(json!({"sessionId": "s1",
+                "modes": {"currentModeId": "ask", "availableModes": [{"id": "ask", "name": "Ask"}, {"id": "code", "name": "Code"}]},
+                "configOptions": [{"id": "model", "category": "model", "type": "select", "currentValue": "big",
+                    "options": [{"value": "big", "name": "Big"}, {"value": "small", "name": "Small"}]}]})),
+            "session/fork" => Ok(json!({"sessionId": "s2"})),
+            "_openidea/rollback" | "_openidea/steer" => {
+                let detail = params.get("turns").cloned().unwrap_or_else(|| params["prompt"][0]["text"].clone());
+                self.calls.lock().push(format!("{method} {detail}"));
+                Ok(json!({}))
+            }
+            "session/load" => {
+                self.say(&session, "replayed history");
+                Ok(json!({}))
+            }
+            "session/set_config_option" | "session/set_mode" => {
+                self.calls.lock().push(format!("{method} {}", params.get("value").or(params.get("modeId")).unwrap()));
+                Ok(json!({}))
+            }
+            "session/prompt" => {
+                let text = params.pointer("/prompt/0/text").and_then(Value::as_str).unwrap_or_default().to_owned();
+                if text == "again" {
+                    self.say(&session, "second turn");
+                    return Ok(json!({"stopReason": "end_turn"}));
+                }
+                if text == "delegate" {
+                    self.delegate(&session);
+                    return Ok(json!({"stopReason": "end_turn"}));
+                }
+                if text == "late option" {
+                    // An option the session offers only once it runs.
+                    self.update(
+                        &session,
+                        json!({"sessionUpdate": "config_option_update", "configOptions": [
+                            {"id": "model", "category": "model", "type": "select", "currentValue": "big",
+                             "options": [{"value": "big", "name": "Big"}, {"value": "small", "name": "Small"}]},
+                            {"id": "effort", "category": "thought_level", "type": "select", "currentValue": "low",
+                             "options": [{"value": "low", "name": "Low"}, {"value": "high", "name": "High"}]}]}),
+                    );
+                    self.say(&session, "ok");
+                    return Ok(json!({"stopReason": "end_turn"}));
+                }
+                if text == "wait" {
+                    // Works until cancelled.
+                    while !self.calls.lock().iter().any(|c| c == "session/cancel") {
+                        std::thread::sleep(Duration::from_millis(5));
+                    }
+                    return Ok(json!({"stopReason": "cancelled"}));
+                }
+                self.update(
+                    &session,
+                    json!({"sessionUpdate": "available_commands_update",
+                    "availableCommands": [{"name": "review", "description": "Review", "input": {"hint": "focus"}}]}),
+                );
+                self.update(&session, json!({"sessionUpdate": "usage_update", "used": 50, "size": 1000}));
+                self.update(&session, json!({"sessionUpdate": "session_info_update", "title": "Lexer fix"}));
+                self.say(&session, "Hi");
+                self.update(
+                    &session,
+                    json!({"sessionUpdate": "tool_call", "toolCallId": "t1", "title": "Edit a.rs",
+                    "kind": "edit", "status": "completed",
+                    "content": [{"type": "diff", "path": "/p/a.rs", "oldText": "a\n", "newText": "b\n"}]}),
+                );
+                let peer = self.latest();
+                let answer: Value = tokio::runtime::Handle::current()
+                    .block_on(peer.request(
+                        "session/request_permission",
+                        json!({"sessionId": session, "toolCall": {"toolCallId": "t1", "title": "Run cargo test"},
+                            "options": [{"optionId": "yes", "name": "Allow", "kind": "allow_once"},
+                                        {"optionId": "no", "name": "Reject", "kind": "reject_once"}]}),
+                        None,
+                    ))
+                    .unwrap();
+                let chosen = answer.pointer("/outcome/optionId").and_then(Value::as_str).unwrap_or("none");
+                self.say(&session, &format!("chose {chosen}"));
+                Ok(json!({"stopReason": "end_turn"}))
+            }
+            _ => Err((codes::METHOD_NOT_FOUND, method.to_owned())),
+        }
+    }
+}
+
+fn manager(dir: &Path, agent: Arc<FakeAgent>) -> AgentManager {
+    manager_at(dir, &dir.join("models.json"), agent)
+}
+
+fn manager_at(dir: &Path, models_file: &Path, agent: Arc<FakeAgent>) -> AgentManager {
+    let connector: Connector = Arc::new(move |_spec, _cwd, client, _stderr| {
+        let (a, b) = duplex(1 << 20);
+        let (ar, aw) = tokio::io::split(a);
+        let (br, bw) = tokio::io::split(b);
+        let server = Peer::connect_framed(br, bw, agent.clone(), Framing::Lines);
+        agent.servers.lock().push(server);
+        Ok(Peer::connect_framed(ar, aw, client, Framing::Lines))
+    });
+    AgentManager::with_connector(
+        AgentPaths {
+            project_root: dir.to_path_buf(),
+            store_dir: dir.join("store"),
+            worktrees_dir: dir.join("worktrees"),
+            models_file: models_file.to_path_buf(),
+            custom_agents_dir: None,
+            home_dir: None,
+        },
+        tokio::runtime::Handle::current(),
+        connector,
+    )
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn commands_are_remembered_per_project_and_merged_with_skills_on_disk() {
+    let tmp = tempfile::tempdir().unwrap();
+    let (a, b, models) = (tmp.path().join("a"), tmp.path().join("b"), tmp.path().join("models.json"));
+    std::fs::create_dir_all(a.join(".claude/skills/triage")).unwrap();
+    std::fs::create_dir_all(&b).unwrap();
+    std::fs::write(a.join(".claude/skills/triage/SKILL.md"), "---\nname: triage\ndescription: Triage\n---\n").unwrap();
+    let names = |c: Vec<AgentCommand>| c.into_iter().map(|c| c.name).collect::<Vec<_>>();
+
+    let mgr_a = manager_at(&a, &models, Arc::new(FakeAgent::default()));
+    // Before any session: only the skills on disk.
+    assert_eq!(names(mgr_a.commands("claude", None).await.unwrap()), ["triage"]);
+    let task = mgr_a
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("Fix the lexer"),
+            provider: "claude".into(),
+            config: Vec::new(),
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr_a, &task.id, AgentStatus::NeedsInput).await;
+    assert_eq!(names(mgr_a.commands("claude", None).await.unwrap()), ["review", "triage"]);
+    assert_eq!(names(mgr_a.commands("claude", Some(&task.id)).await.unwrap()), ["review", "triage"]);
+    // Other agents get only what they offered.
+    assert!(mgr_a.commands("codex", None).await.unwrap().is_empty());
+    mgr_a.cancel(&task.id, None).unwrap();
+    wait_for(&mgr_a, &task.id, AgentStatus::Ready).await;
+    mgr_a.shutdown();
+
+    // Another project shares the settings but not the commands.
+    let mgr_b = manager_at(&b, &models, Arc::new(FakeAgent::default()));
+    let claude = mgr_b.providers().into_iter().find(|p| p.id == "claude").unwrap();
+    assert_eq!(claude.config.len(), 2);
+    assert!(claude.commands.is_empty());
+    assert!(mgr_b.commands("claude", None).await.unwrap().is_empty());
+    let mgr_a = manager_at(&a, &models, Arc::new(FakeAgent::default()));
+    assert_eq!(names(mgr_a.providers().into_iter().find(|p| p.id == "claude").unwrap().commands), ["review"]);
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn builtin_commands_only_fill_verified_gaps_and_preserve_advertised_metadata() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager_at(tmp.path(), &tmp.path().join("models.json"), agent);
+    for provider in ["claude", "claude-acp", "opencode2", "codex", "custom"] {
+        assert!(mgr.commands(provider, None).await.unwrap().is_empty(), "{provider}");
+    }
+    let commands = mgr.commands("opencode", None).await.unwrap();
+    assert_eq!(commands.iter().map(|c| c.name.as_str()).collect::<Vec<_>>(), ["compact"]);
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("Hello"),
+            provider: "opencode".into(),
+            config: Vec::new(),
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+    let advertised = AgentCommand {
+        name: "compact".into(),
+        description: "Agent supplied description".into(),
+        hint: Some("instructions".into()),
+    };
+    mgr.task(&task.id).unwrap().state.lock().task.commands = vec![advertised.clone()];
+    // The task's provider wins over the caller's provider; metadata is not replaced.
+    let commands = mgr.commands("claude", Some(&task.id)).await.unwrap();
+    assert_eq!(commands.len(), 1);
+    assert_eq!(commands[0].name, advertised.name);
+    assert_eq!(commands[0].description, advertised.description);
+    assert_eq!(commands[0].hint, advertised.hint);
+    // Finish the in-process agent before Tokio stops driving its permission response.
+    mgr.cancel(&task.id, None).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    mgr.shutdown();
+}
+
+async fn wait_for(mgr: &AgentManager, id: &str, status: AgentStatus) {
+    for _ in 0..500 {
+        let task = mgr.task(id).unwrap();
+        let (current, busy) = {
+            let s = task.state.lock();
+            (s.task.status, s.busy)
+        };
+        // Settled statuses only count once the run is over (a prompt just sent hasn't started).
+        let settled = !matches!(status, AgentStatus::Ready | AgentStatus::Failed | AgentStatus::Limited) || !busy;
+        if current == status && settled {
+            return;
+        }
+        tokio::time::sleep(Duration::from_millis(10)).await;
+    }
+    let s = mgr.task(id).unwrap().state.lock().task.status;
+    panic!("task never reached {status:?} (is {s:?})");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_task_runs_asks_for_permission_and_survives_a_restart() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let events = Arc::new(Mutex::new(Vec::<AgentEvent>::new()));
+    let sink = events.clone();
+    mgr.subscribe(Arc::new(move |e| sink.lock().push(e)));
+
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("Fix the lexer\nmore detail"),
+            provider: "claude".into(),
+            config: vec![AgentConfigChoice { id: "model".into(), value: "small".into() }],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    assert_eq!(task.title, "Fix the lexer");
+    assert_ne!(mgr.task(&task.id).unwrap().state.lock().task.status, AgentStatus::Ready, "a new task is not settled");
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+
+    let permission = mgr
+        .entries(&task.id, None)
+        .unwrap()
+        .iter()
+        .find_map(|e| match e {
+            AgentEntry::Permission { id, .. } => Some(*id),
+            _ => None,
+        })
+        .unwrap();
+    mgr.respond(&task.id, permission, Some("yes".into())).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+
+    let entries = mgr.entries(&task.id, None).unwrap();
+    let kinds: Vec<String> = entries
+        .iter()
+        .map(|e| match e {
+            AgentEntry::User { text, .. } | AgentEntry::Agent { text } => text.clone(),
+            AgentEntry::Tool { title, .. } => title.clone(),
+            AgentEntry::Permission { chosen, .. } => format!("permission: {}", chosen.clone().unwrap_or_default()),
+            other => format!("{other:?}"),
+        })
+        .collect();
+    assert_eq!(kinds, ["Fix the lexer\nmore detail", "Hi", "Edit a.rs", "permission: Allow", "chose yes"]);
+    assert!(
+        agent.calls.lock().contains(&"session/set_config_option \"small\"".to_owned()),
+        "switched to the chosen model"
+    );
+    {
+        let t = mgr.task(&task.id).unwrap().state.lock().task.clone();
+        assert_eq!(t.model.as_deref(), Some("small"));
+        let modes = t.config.iter().find(|o| o.id == "mode").unwrap();
+        assert_eq!((modes.via, modes.current.as_deref()), (AgentConfigVia::Mode, Some("ask")));
+        assert_eq!(t.commands.iter().map(|c| c.name.as_str()).collect::<Vec<_>>(), ["review"]);
+        assert_eq!(t.usage.as_ref().map(|u| (u.used, u.size)), Some((50, 1000)));
+        assert_eq!(t.title, "Lexer fix", "the agent's title replaces the prompt's first line");
+    }
+    mgr.set_config(&task.id, "mode", "code".into()).await.unwrap();
+    assert!(agent.calls.lock().contains(&"session/set_mode \"code\"".to_owned()));
+    assert!(mgr.set_config(&task.id, "mode", "nope".into()).await.is_err());
+
+    tokio::time::sleep(FLUSH_DELAY * 3).await;
+    {
+        let events = events.lock();
+        assert!(
+            events.iter().any(|e| matches!(e, AgentEvent::Task { task } if task.status == AgentStatus::NeedsInput))
+        );
+        let last_entry = events.iter().rev().find_map(|e| match e {
+            AgentEvent::Entry { index, entry, .. } if !matches!(entry, AgentEntry::User { .. }) => {
+                Some((*index, entry.clone()))
+            }
+            _ => None,
+        });
+        assert_eq!(last_entry, Some((4, AgentEntry::Agent { text: "chose yes".into() })));
+        // The turn's end is recorded on the message that started it.
+        assert!(events.iter().any(|e| matches!(
+            e,
+            AgentEvent::Entry { index: 0, entry: AgentEntry::User { sent_ms: Some(_), done_ms: Some(_), .. }, .. }
+        )));
+    }
+    let providers = mgr.providers();
+    let claude = providers.iter().find(|p| p.id == "claude").unwrap();
+    assert_eq!(claude.config.iter().map(|o| o.id.as_str()).collect::<Vec<_>>(), ["model", "mode"]);
+    assert_eq!(claude.commands.len(), 1);
+
+    // A new manager (IDE restart) finds the task and resumes its session without duplicating history.
+    mgr.shutdown();
+    let agent2 = Arc::new(FakeAgent::default());
+    let mgr2 = manager(tmp.path(), agent2.clone());
+    assert_eq!(mgr2.entries(&task.id, None).unwrap().len(), 5);
+    assert_eq!(mgr2.task(&task.id).unwrap().state.lock().task.title, "Lexer fix");
+    assert_eq!(mgr2.providers().iter().find(|p| p.id == "claude").unwrap().config.len(), 2);
+    mgr2.prompt(&task.id, text("again"), false).await.unwrap();
+    tokio::time::sleep(Duration::from_millis(50)).await;
+    wait_for(&mgr2, &task.id, AgentStatus::Ready).await;
+    let entries = mgr2.entries(&task.id, None).unwrap();
+    assert_eq!(entries.len(), 7);
+    assert_eq!(entries[6], AgentEntry::Agent { text: "second turn".into() });
+    assert!(agent2.calls.lock().contains(&"session/load".to_owned()));
+    // The chosen settings are re-applied to the reloaded session.
+    let calls = agent2.calls.lock().clone();
+    assert!(calls.contains(&"session/set_mode \"code\"".to_owned()), "{calls:?}");
+}
+
+fn text(t: &str) -> AgentPrompt {
+    AgentPrompt { text: t.into(), ..AgentPrompt::default() }
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn messages_sent_while_busy_are_queued_and_send_now_interrupts() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("wait"),
+            provider: "claude".into(),
+            config: vec![],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Running).await;
+    mgr.prompt(&task.id, text("again"), false).await.unwrap();
+    let queue = mgr.task(&task.id).unwrap().state.lock().task.queue.clone();
+    assert_eq!(queue.iter().map(|q| q.prompt.text.as_str()).collect::<Vec<_>>(), ["again"]);
+    assert!(mgr.prompt(&task.id, text("  "), false).await.is_err());
+
+    mgr.send_queued_now(&task.id, &queue[0].id).unwrap();
+    for _ in 0..500 {
+        if mgr.entries(&task.id, None).unwrap().iter().any(|e| *e == AgentEntry::Agent { text: "second turn".into() }) {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(10)).await;
+    }
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    let users: Vec<String> = mgr
+        .entries(&task.id, None)
+        .unwrap()
+        .into_iter()
+        .filter_map(|e| match e {
+            AgentEntry::User { text, .. } => Some(text),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(users, ["wait", "again"]);
+    assert!(mgr.task(&task.id).unwrap().state.lock().task.queue.is_empty());
+
+    // Stopping a turn keeps the queue for later.
+    mgr.prompt(&task.id, text("wait"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Running).await;
+    agent.calls.lock().retain(|c| c != "session/cancel");
+    mgr.prompt(&task.id, text("later"), false).await.unwrap();
+    mgr.cancel(&task.id, None).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    let queued = mgr.task(&task.id).unwrap().state.lock().task.queue.clone();
+    assert_eq!(queued.len(), 1);
+    assert_eq!(mgr.unqueue(&task.id, &queued[0].id).unwrap().prompt.text, "later");
+    assert!(mgr.task(&task.id).unwrap().state.lock().task.queue.is_empty());
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn subagents_get_their_own_conversation() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("delegate"),
+            provider: "claude".into(),
+            config: vec![],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    // The subagent's permission request is answered in the task's conversation.
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+    let (id, title) = mgr
+        .entries(&task.id, None)
+        .unwrap()
+        .into_iter()
+        .find_map(|e| match e {
+            AgentEntry::Permission { id, title, .. } => Some((id, title)),
+            _ => None,
+        })
+        .unwrap();
+    assert_eq!(title, "Explore: Run ls");
+    mgr.respond(&task.id, id, Some("yes".into())).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    assert!(agent.calls.lock().iter().any(|c| c == "subagents"));
+
+    let check = |mgr: &AgentManager| {
+        let main = mgr.entries(&task.id, None).unwrap();
+        let card = main.iter().find(|e| matches!(e, AgentEntry::Subagent { .. })).unwrap();
+        let AgentEntry::Subagent { title, status, prompt, reply, tools, activity, .. } = card else { unreachable!() };
+        assert_eq!(title.as_deref(), Some("Explore"));
+        assert_eq!(*status, AgentSubagentStatus::Done);
+        assert_eq!((prompt.as_deref(), reply.as_deref()), (Some("Find the lexer"), Some("lexer.rs")));
+        assert_eq!((*tools, activity.as_deref()), (1, Some("Read lexer.rs")));
+        assert!(main.contains(&AgentEntry::Agent { text: "Found it".into() }));
+        assert!(!main.iter().any(|e| matches!(e, AgentEntry::Tool { .. })));
+        let sub = mgr.entries(&task.id, Some("c1".into())).unwrap();
+        assert!(matches!(&sub[0], AgentEntry::Tool { title, .. } if title == "Read lexer.rs"));
+        assert_eq!(sub[1], AgentEntry::Agent { text: "It is in lexer.rs".into() });
+    };
+    // Updates can trail the end of the turn.
+    for _ in 0..500 {
+        if mgr.entries(&task.id, None).unwrap().contains(&AgentEntry::Agent { text: "Found it".into() }) {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(10)).await;
+    }
+    check(&mgr);
+    // The subagent's context use is not the task's.
+    assert_ne!(mgr.task(&task.id).unwrap().state.lock().task.usage.as_ref().map(|u| u.used), Some(900));
+    assert!(mgr.entries(&task.id, Some("nope".into())).is_err());
+
+    // Saved with the task.
+    mgr.shutdown();
+    check(&manager(tmp.path(), Arc::new(FakeAgent::default())));
+}
+
+#[test]
+fn prompts_become_acp_content_blocks() {
+    let p = AgentPrompt {
+        text: "look".into(),
+        files: vec![IpcPath(PathBuf::from("/p/my file.rs"))],
+        images: vec![AgentImage { mime_type: "image/png".into(), data: "AAA".into(), name: None }],
+    };
+    assert_eq!(
+        blocks(&p, &[]),
+        [
+            json!({"type": "text", "text": "look"}),
+            json!({"type": "resource_link", "uri": "file:///p/my%20file.rs", "name": "my file.rs"}),
+            json!({"type": "image", "mimeType": "image/png", "data": "AAA"}),
+        ]
+    );
+    assert_eq!(
+        blocks(&p, &[Some("fn a() {}".into())])[1],
+        json!({"type": "resource", "resource": {"uri": "file:///p/my%20file.rs", "text": "fn a() {}"}})
+    );
+    // A slash command goes through as typed: the agent runs it.
+    let skill = clean(text(" /triage dry-run\n")).unwrap();
+    assert_eq!(blocks(&skill, &[]), [json!({"type": "text", "text": "/triage dry-run"})]);
+    let old = upgrade(
+        json!({"task": {"id": "t"}, "entries": [{"type": "user", "text": "hi"}, {"type": "agent", "text": "a"}]}),
+    );
+    assert_eq!(old["task"]["queue"], json!([]));
+    assert_eq!(old["entries"][0]["attachments"], json!([]));
+    assert!(old["entries"][1].get("attachments").is_none());
+    assert_eq!(title_of(&AgentPrompt { files: p.files.clone(), ..AgentPrompt::default() }), "my file.rs");
+    assert!(clean(text(" ")).is_none());
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn cancelling_resolves_the_open_permission_and_delete_forgets_the_task() {
+    let tmp = tempfile::tempdir().unwrap();
+    let mgr = manager(tmp.path(), Arc::new(FakeAgent::default()));
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("do it"),
+            provider: "codex".into(),
+            config: vec![],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+    mgr.cancel(&task.id, None).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    let entries = mgr.entries(&task.id, None).unwrap();
+    assert!(entries.iter().any(|e| matches!(e, AgentEntry::Permission { chosen: Some(c), .. } if c == "Cancelled")));
+    assert_eq!(entries.last(), Some(&AgentEntry::Agent { text: "chose none".into() }));
+    assert_eq!(mgr.task(&task.id).unwrap().state.lock().task.model.as_deref(), Some("big"), "the agent's default");
+
+    mgr.delete(&task.id, false).await.unwrap();
+    assert!(mgr.entries(&task.id, None).is_err());
+    assert!(!tmp.path().join("store").join(format!("{}.json", task.id)).exists());
+    assert!(
+        mgr.create(NewAgentTask {
+            project_root: None,
+            prompt: text(" "),
+            provider: "codex".into(),
+            config: vec![],
+            isolation: Isolation::Local,
+            base: None
+        })
+        .await
+        .is_err()
+    );
+}
+
+/// Drives the real Claude Code adapter (needs `npx`, network and a signed-in `claude`):
+/// `OPENIDEA_AGENT_E2E=1 cargo test -p ide-agent real_claude -- --ignored --nocapture`.
+#[tokio::test(flavor = "multi_thread")]
+#[ignore]
+async fn real_claude_task_in_a_worktree() {
+    if std::env::var_os("OPENIDEA_AGENT_E2E").is_none() {
+        return;
+    }
+    let tmp = tempfile::tempdir().unwrap();
+    let repo = tmp.path().join("repo");
+    std::fs::create_dir(&repo).unwrap();
+    for args in [&["init", "-q", "-b", "main"][..], &["commit", "-q", "--allow-empty", "-m", "init"]] {
+        let ok = std::process::Command::new("git")
+            .args(["-c", "user.name=t", "-c", "user.email=t@t", "-c", "commit.gpgsign=false"])
+            .args(args)
+            .current_dir(&repo)
+            .status()
+            .unwrap()
+            .success();
+        assert!(ok);
+    }
+    let mgr = AgentManager::new(
+        AgentPaths {
+            project_root: repo.clone(),
+            store_dir: tmp.path().join("store"),
+            worktrees_dir: tmp.path().join("wt"),
+            models_file: tmp.path().join("models.json"),
+            custom_agents_dir: None,
+            home_dir: None,
+        },
+        tokio::runtime::Handle::current(),
+    );
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("Create a file named hello.txt containing the single word hi. Do nothing else."),
+            provider: "claude".into(),
+            config: vec![AgentConfigChoice { id: "model".into(), value: "haiku".into() }],
+            isolation: Isolation::Worktree,
+            base: None,
+        })
+        .await
+        .unwrap();
+    let deadline = std::time::Instant::now() + Duration::from_secs(240);
+    loop {
+        assert!(std::time::Instant::now() < deadline, "timed out");
+        let status = mgr.task(&task.id).unwrap().state.lock().task.status;
+        match status {
+            AgentStatus::NeedsInput => {
+                let pending = mgr.entries(&task.id, None).unwrap().into_iter().rev().find_map(|e| match e {
+                    AgentEntry::Permission { id, options, chosen: None, .. } => Some((id, options)),
+                    _ => None,
+                });
+                if let Some((id, options)) = pending {
+                    let allow = options.iter().find(|o| o.kind == "allow_once").or(options.first()).unwrap();
+                    eprintln!("allowing: {}", allow.name);
+                    let _ = mgr.respond(&task.id, id, Some(allow.id.clone()));
+                }
+            }
+            AgentStatus::Ready | AgentStatus::Failed => break,
+            _ => {}
+        }
+        tokio::time::sleep(Duration::from_millis(200)).await;
+    }
+    for e in mgr.entries(&task.id, None).unwrap() {
+        eprintln!("{e:?}");
+    }
+    let t = mgr.task(&task.id).unwrap().state.lock().task.clone();
+    assert_eq!(t.status, AgentStatus::Ready, "{:?}", t.error);
+    assert_eq!(t.model.as_deref(), Some("haiku"));
+    let changes = mgr.changes(&task.id).await.unwrap();
+    assert!(changes.iter().any(|c| c.rel_path == "hello.txt"), "{changes:?}");
+    assert!(!repo.join("hello.txt").exists(), "the project checkout is untouched");
+    assert!(!mgr.providers().iter().find(|p| p.id == "claude").unwrap().config.is_empty());
+    mgr.shutdown();
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn forks_rollbacks_and_steering() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let new = |prompt: &str| NewAgentTask {
+        project_root: None,
+        prompt: text(prompt),
+        provider: "claude".into(),
+        config: Vec::new(),
+        isolation: Isolation::Local,
+        base: None,
+    };
+    let task = mgr.create(new("again")).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    mgr.prompt(&task.id, text("again"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    let caps = mgr.task(&task.id).unwrap().state.lock().task.capabilities;
+    assert!(caps.fork && caps.rollback && caps.steer);
+
+    // A copy from after the first turn: the new task drops the second once it loads.
+    let copy = mgr.fork(&task.id, Some(1)).await.unwrap();
+    assert_eq!(turn_starts(&mgr.entries(&copy.id, None).unwrap()).len(), 1);
+    assert_eq!(mgr.task(&copy.id).unwrap().state.lock().pending_rollback, 1);
+    mgr.prompt(&copy.id, text("again"), false).await.unwrap();
+    wait_for(&mgr, &copy.id, AgentStatus::Ready).await;
+    {
+        let calls = agent.calls.lock();
+        let load = calls.iter().rposition(|c| c == "session/load").unwrap();
+        assert!(calls[load..].iter().any(|c| c == "_openidea/rollback 1"));
+    }
+
+    // Undoing the last turn hands its message back.
+    let undone = mgr.rollback(&task.id, 1).await.unwrap().unwrap();
+    assert_eq!(undone.text, "again");
+    assert_eq!(turn_starts(&mgr.entries(&task.id, None).unwrap()).len(), 1);
+    assert!(agent.calls.lock().iter().any(|c| c == "_openidea/rollback 1"));
+
+    // A message sent now while the agent works joins the turn.
+    mgr.prompt(&task.id, text("wait"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Running).await;
+    mgr.prompt(&task.id, text("also this"), true).await.unwrap();
+    assert!(agent.calls.lock().iter().any(|c| c == "_openidea/steer \"also this\""));
+    let entries = mgr.entries(&task.id, None).unwrap();
+    assert!(matches!(entries.last(), Some(AgentEntry::User { steered: true, .. })));
+    assert!(mgr.task(&task.id).unwrap().state.lock().task.queue.is_empty());
+    mgr.cancel(&task.id, None).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn usage_limits_and_late_settings() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("limit"),
+            provider: "claude".into(),
+            // `effort` isn't offered until the session runs.
+            config: vec![AgentConfigChoice { id: "effort".into(), value: "high".into() }],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Limited).await;
+    assert_eq!(mgr.task(&task.id).unwrap().state.lock().task.resets_ms, Some(1234.0));
+
+    mgr.prompt(&task.id, text("late option"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    for _ in 0..100 {
+        if agent.calls.lock().iter().any(|c| c == "session/set_config_option \"high\"") {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(10)).await;
+    }
+    assert!(agent.calls.lock().iter().any(|c| c == "session/set_config_option \"high\""));
+    let config = mgr.task(&task.id).unwrap().state.lock().task.config.clone();
+    assert_eq!(config.iter().find(|o| o.id == "effort").unwrap().current.as_deref(), Some("high"));
+}
+
+#[test]
+fn retry_updates_become_a_countdown() {
+    let update =
+        json!({"sessionUpdate": RETRY_UPDATE, "attempt": 2, "maxRetries": 10, "retryDelayMs": 1500, "error": ""});
+    assert_eq!(
+        retry_of(&update, 1000.0),
+        Some(AgentRetry { attempt: 2, max_retries: Some(10), retry_at_ms: 2500.0, error: None })
+    );
+    assert_eq!(retry_of(&json!({"sessionUpdate": RETRY_UPDATE}), 0.0), None, "no attempt");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn cursor_approval_switch_resolves_pending_and_survives_restart() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let new = || NewAgentTask {
+        project_root: None,
+        prompt: text("Fix"),
+        provider: "cursor".into(),
+        config: Vec::new(),
+        isolation: Isolation::Local,
+        base: None,
+    };
+    let task = mgr.create(new()).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+    mgr.set_config(&task.id, config::CURSOR_APPROVAL, "bypass".into()).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    assert!(
+        mgr.entries(&task.id, None)
+            .unwrap()
+            .iter()
+            .any(|e| matches!(e, AgentEntry::Permission { chosen: Some(name), .. } if name == "Allow"))
+    );
+    // Agent config updates must not erase the client's approval setting.
+    mgr.prompt(&task.id, text("late option"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    let t = mgr.task(&task.id).unwrap();
+    assert!(config::bypass_approvals("cursor", &t.state.lock().task.config));
+    t.kill();
+    mgr.prompt(&task.id, text("Fix again"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    assert!(!agent.calls.lock().iter().any(|c| c.contains("bypass")));
+    assert!(config::bypass_approvals("cursor", &mgr.shared.known_config("cursor")));
+    mgr.set_config(&task.id, config::CURSOR_APPROVAL, "ask".into()).await.unwrap();
+    mgr.prompt(&task.id, text("Fix once more"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+    mgr.cancel(&task.id, None).unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    // A task created without choosing approvals still asks; the New Task page sends the default.
+    let other = mgr.create(new()).await.unwrap();
+    wait_for(&mgr, &other.id, AgentStatus::NeedsInput).await;
+    mgr.cancel(&other.id, None).unwrap();
+    wait_for(&mgr, &other.id, AgentStatus::Ready).await;
+    mgr.shutdown();
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn cursor_approval_choice_applies_before_first_prompt() {
+    let tmp = tempfile::tempdir().unwrap();
+    let mgr = manager(tmp.path(), Arc::new(FakeAgent::default()));
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("Fix"),
+            provider: "cursor".into(),
+            config: vec![AgentConfigChoice { id: config::CURSOR_APPROVAL.into(), value: "bypass".into() }],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    mgr.shutdown();
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn archived_tasks_can_be_restored_and_continue_their_session() {
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text("again"),
+            provider: "claude".into(),
+            config: vec![],
+            isolation: Isolation::Local,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    let entries = mgr.entries(&task.id, None).unwrap();
+    mgr.archive(&task.id).unwrap();
+    assert!(mgr.prompt(&task.id, text("again"), false).await.is_err());
+    mgr.unarchive(&task.id).unwrap();
+    assert_eq!(mgr.task(&task.id).unwrap().state.lock().task.status, AgentStatus::Ready);
+    assert!(mgr.task(&task.id).unwrap().live.lock().is_none());
+    assert_eq!(mgr.entries(&task.id, None).unwrap().len(), entries.len());
+    drop(mgr);
+    let mgr = manager(tmp.path(), agent.clone());
+    assert_eq!(mgr.task(&task.id).unwrap().state.lock().task.status, AgentStatus::Ready);
+    mgr.prompt(&task.id, text("again"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    assert!(agent.calls.lock().iter().any(|call| call == "session/load"));
+    assert_eq!(mgr.entries(&task.id, None).unwrap().len(), entries.len() + 2);
+    mgr.unarchive(&task.id).unwrap();
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn task_project_root_controls_local_and_worktree_repositories() {
+    let tmp = tempfile::tempdir().unwrap();
+    let root = dunce::canonicalize(tmp.path()).unwrap();
+    let member = root.join("project-b");
+    std::fs::create_dir(&member).unwrap();
+    let git = |args: &[&str]| {
+        let out = std::process::Command::new("git")
+            .args(["-c", "user.name=t", "-c", "user.email=t@t", "-c", "commit.gpgsign=false"])
+            .args(args)
+            .current_dir(&member)
+            .output()
+            .unwrap();
+        assert!(out.status.success(), "{}", String::from_utf8_lossy(&out.stderr));
+        String::from_utf8_lossy(&out.stdout).trim().to_owned()
+    };
+    git(&["init", "-q", "-b", "member-main"]);
+    std::fs::write(member.join("file.txt"), "original\n").unwrap();
+    git(&["add", "."]);
+    git(&["commit", "-qm", "initial"]);
+    let mgr = manager(&root, Arc::new(FakeAgent::default()));
+    for isolation in [Isolation::Local, Isolation::Worktree] {
+        let task = mgr
+            .create(NewAgentTask {
+                project_root: Some(IpcPath(member.clone())),
+                prompt: text("member task"),
+                provider: "claude".into(),
+                config: vec![],
+                isolation,
+                base: None,
+            })
+            .await
+            .unwrap();
+        wait_for(&mgr, &task.id, AgentStatus::NeedsInput).await;
+        let permission = mgr
+            .entries(&task.id, None)
+            .unwrap()
+            .iter()
+            .find_map(|e| match e {
+                AgentEntry::Permission { id, .. } => Some(*id),
+                _ => None,
+            })
+            .unwrap();
+        mgr.respond(&task.id, permission, Some("yes".into())).unwrap();
+        wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+        assert_eq!(task.project_root, Some(IpcPath(member.clone())));
+        assert_eq!(task.base.as_deref(), Some("member-main"));
+        if isolation == Isolation::Local {
+            assert_eq!(task.cwd.0, member);
+        } else {
+            assert_ne!(task.cwd.0, member);
+            assert_eq!(std::fs::read_to_string(task.cwd.0.join("file.txt")).unwrap(), "original\n");
+        }
+        std::fs::write(task.cwd.0.join("file.txt"), "changed\n").unwrap();
+        let changes = mgr.changes(&task.id).await.unwrap();
+        assert_eq!(changes.len(), 1);
+        assert_eq!(changes[0].path.0, task.cwd.0.join("file.txt"));
+        assert_eq!(mgr.base_text(&task.id, changes[0].path.0.clone()).await.unwrap().as_deref(), Some("original\n"));
+        let saved = std::fs::read(root.join("store").join(format!("{}.json", task.id))).unwrap();
+        assert!(String::from_utf8(saved).unwrap().contains("projectRoot"));
+        let mut old = serde_json::to_value(&task).unwrap();
+        old.as_object_mut().unwrap().remove("projectRoot");
+        assert!(serde_json::from_value::<AgentTask>(old).unwrap().project_root.is_none());
+        mgr.delete(&task.id, true).await.unwrap();
+        if isolation == Isolation::Worktree {
+            assert!(!task.cwd.0.exists());
+        }
+        std::fs::write(member.join("file.txt"), "original\n").unwrap();
+    }
+    assert_eq!(git(&["worktree", "list", "--porcelain"]).matches("worktree ").count(), 1);
+}

crates/ide-agent/src/timeline.rs

@@ -0,0 +1,470 @@
+//! Folds ACP `session/update` notifications into a task's entries.
+
+use crate::model::{AgentEntry, AgentPlanItem, AgentSubagentStatus, AgentToolDiff, AgentToolStatus};
+use ide_core::IpcPath;
+use serde_json::Value;
+use std::collections::HashMap;
+
+/// Tool output kept per call; longer output keeps its tail.
+const MAX_OUTPUT: usize = 64 * 1024;
+
+#[derive(Default)]
+pub(crate) struct Timeline {
+    pub entries: Vec<AgentEntry>,
+    tools: HashMap<String, usize>,
+    plan: Option<usize>,
+    /// Subagent cards, by the subagent's session id.
+    cards: HashMap<String, usize>,
+    /// Session messages, by message id.
+    messages: HashMap<String, usize>,
+}
+
+/// What a `session/update` changed in the timeline.
+#[derive(Debug, Default, PartialEq)]
+pub(crate) struct Applied {
+    /// Indices of the entries added or changed.
+    pub changed: Vec<usize>,
+}
+
+impl Timeline {
+    pub fn from_entries(entries: Vec<AgentEntry>) -> Self {
+        let mut t = Self { entries, ..Self::default() };
+        for (i, e) in t.entries.iter().enumerate() {
+            match e {
+                AgentEntry::Tool { id, .. } => {
+                    t.tools.insert(id.clone(), i);
+                }
+                AgentEntry::Plan { .. } => t.plan = Some(i),
+                AgentEntry::Subagent { id, .. } => {
+                    t.cards.insert(id.clone(), i);
+                }
+                _ => {}
+            }
+        }
+        t
+    }
+
+    pub fn push(&mut self, entry: AgentEntry) -> usize {
+        self.entries.push(entry);
+        self.entries.len() - 1
+    }
+
+    /// Applies one `session/update` `update` object.
+    pub fn apply(&mut self, update: &Value) -> Applied {
+        let mut out = Applied::default();
+        let kind = update.get("sessionUpdate").and_then(Value::as_str).unwrap_or_default();
+        match kind {
+            "agent_message_chunk" | "agent_thought_chunk" => {
+                let Some(text) = content_text(update.get("content")) else { return out };
+                out.changed.push(self.append_text(kind == "agent_thought_chunk", &text));
+            }
+            "tool_call" => {
+                let id = str_field(update, "toolCallId");
+                let entry = AgentEntry::Tool {
+                    id: id.clone(),
+                    title: str_field(update, "title"),
+                    kind: update.get("kind").and_then(Value::as_str).unwrap_or("other").to_owned(),
+                    status: tool_status(update.get("status")).unwrap_or(AgentToolStatus::Pending),
+                    locations: locations(update.get("locations")),
+                    output: None,
+                    diffs: Vec::new(),
+                };
+                let index = match self.tools.get(&id) {
+                    Some(&i) => {
+                        self.entries[i] = entry;
+                        i
+                    }
+                    None => {
+                        let i = self.push(entry);
+                        self.tools.insert(id, i);
+                        i
+                    }
+                };
+                self.merge_tool(index, update);
+                out.changed.push(index);
+            }
+            "tool_call_update" => {
+                let Some(&index) = self.tools.get(&str_field(update, "toolCallId")) else { return out };
+                self.merge_tool(index, update);
+                out.changed.push(index);
+            }
+            "plan" => {
+                let items = update
+                    .get("entries")
+                    .and_then(Value::as_array)
+                    .map(|a| {
+                        a.iter()
+                            .map(|e| AgentPlanItem { content: str_field(e, "content"), status: str_field(e, "status") })
+                            .collect()
+                    })
+                    .unwrap_or_default();
+                let entry = AgentEntry::Plan { items };
+                let index = match self.plan {
+                    Some(i) => {
+                        self.entries[i] = entry;
+                        i
+                    }
+                    None => self.push(entry),
+                };
+                self.plan = Some(index);
+                out.changed.push(index);
+            }
+            _ => {}
+        }
+        out
+    }
+
+    fn append_text(&mut self, thought: bool, text: &str) -> usize {
+        match self.entries.last_mut() {
+            Some(AgentEntry::Agent { text: t }) if !thought => t.push_str(text),
+            Some(AgentEntry::Thought { text: t }) if thought => t.push_str(text),
+            _ => {
+                let text = text.to_owned();
+                return self.push(if thought { AgentEntry::Thought { text } } else { AgentEntry::Agent { text } });
+            }
+        }
+        self.entries.len() - 1
+    }
+
+    fn merge_tool(&mut self, index: usize, update: &Value) {
+        let AgentEntry::Tool { title, kind, status, locations: locs, output, diffs, .. } = &mut self.entries[index]
+        else {
+            return;
+        };
+        if let Some(t) = update.get("title").and_then(Value::as_str) {
+            *title = t.to_owned();
+        }
+        if let Some(k) = update.get("kind").and_then(Value::as_str) {
+            *kind = k.to_owned();
+        }
+        if let Some(s) = tool_status(update.get("status")) {
+            *status = s;
+        }
+        if update.get("locations").is_some_and(Value::is_array) {
+            *locs = locations(update.get("locations"));
+        }
+        let Some(content) = update.get("content").and_then(Value::as_array) else { return };
+        let mut text = String::new();
+        let mut new_diffs = Vec::new();
+        for item in content {
+            match item.get("type").and_then(Value::as_str) {
+                Some("content") => {
+                    if let Some(t) = content_text(item.get("content")) {
+                        if !text.is_empty() {
+                            text.push('\n');
+                        }
+                        text.push_str(&t);
+                    }
+                }
+                Some("diff") => {
+                    let old = item.get("oldText").and_then(Value::as_str).unwrap_or_default();
+                    let new = item.get("newText").and_then(Value::as_str).unwrap_or_default();
+                    let (added, removed) = line_stats(old, new);
+                    new_diffs.push(AgentToolDiff { path: IpcPath(str_field(item, "path").into()), added, removed });
+                }
+                _ => {}
+            }
+        }
+        if !text.is_empty() {
+            *output = Some(tail(text));
+        }
+        if !new_diffs.is_empty() {
+            *diffs = new_diffs;
+        }
+    }
+
+    /// Adds or updates the card of subagent `id` from its `subagent_update`; returns the
+    /// card's index and whether the subagent just stopped working.
+    pub fn subagent(&mut self, id: &str, update: &Value, now: f64) -> (usize, bool) {
+        let index = match self.cards.get(id) {
+            Some(&i) => i,
+            None => {
+                let i = self.push(AgentEntry::Subagent {
+                    id: id.to_owned(),
+                    title: None,
+                    description: None,
+                    status: AgentSubagentStatus::Running,
+                    error: None,
+                    prompt: None,
+                    reply: None,
+                    tools: 0,
+                    activity: None,
+                    started_ms: now,
+                    ended_ms: None,
+                    cancellable: false,
+                });
+                self.cards.insert(id.to_owned(), i);
+                i
+            }
+        };
+        let AgentEntry::Subagent { title, description, status, error, ended_ms, cancellable, .. } =
+            &mut self.entries[index]
+        else {
+            return (index, false);
+        };
+        // Patch semantics: an omitted field is unchanged, `null` clears it.
+        if let Some(v) = update.get("title") {
+            *title = v.as_str().map(str::to_owned);
+        }
+        if let Some(v) = update.get("description") {
+            *description = v.as_str().map(str::to_owned);
+        }
+        if let Some(v) = update.get("capabilities") {
+            *cancellable = v.get("cancel").is_some_and(Value::is_object);
+        }
+        let mut stopped = false;
+        if let Some((next, message)) = update.get("state").and_then(subagent_status) {
+            let working = matches!(next, AgentSubagentStatus::Running | AgentSubagentStatus::NeedsInput);
+            stopped = !working && ended_ms.is_none();
+            *ended_ms = if working { None } else { ended_ms.or(Some(now)) };
+            *status = next;
+            *error = message;
+        }
+        (index, stopped)
+    }
+
+    /// Sets (or with `append`, extends) what subagent `id` was asked or answered, on its card.
+    pub fn card_message(&mut self, id: &str, reply: bool, text: &str, append: bool) -> Option<usize> {
+        let &index = self.cards.get(id)?;
+        let AgentEntry::Subagent { prompt, reply: answer, .. } = &mut self.entries[index] else { return None };
+        let field = if reply { answer } else { prompt };
+        match field {
+            Some(t) if append => t.push_str(text),
+            _ => *field = Some(text.to_owned()),
+        }
+        Some(index)
+    }
+
+    /// Adds, replaces or (with `append`) extends session message `id`.
+    pub fn message(&mut self, id: &str, incoming: bool, text: &str, append: bool) -> usize {
+        if let Some(&i) = self.messages.get(id)
+            && let AgentEntry::Message { text: t, .. } = &mut self.entries[i]
+        {
+            if append {
+                t.push_str(text);
+            } else {
+                *t = text.to_owned();
+            }
+            return i;
+        }
+        let i = self.push(AgentEntry::Message { incoming, text: text.to_owned() });
+        self.messages.insert(id.to_owned(), i);
+        i
+    }
+
+    /// Updates subagent `id`'s card with what its own timeline `of` shows: how many tool
+    /// calls it made and its latest one. Returns the card's index when it changed.
+    pub fn card_activity(&mut self, id: &str, of: &Timeline) -> Option<usize> {
+        let &index = self.cards.get(id)?;
+        let AgentEntry::Subagent { tools, activity, .. } = &mut self.entries[index] else { return None };
+        let calls = of.entries.iter().filter_map(|e| match e {
+            AgentEntry::Tool { title, kind, .. } => Some(if title.is_empty() { kind } else { title }),
+            _ => None,
+        });
+        let count = calls.clone().count() as u32;
+        let latest = calls.clone().next_back().cloned();
+        if *tools == count && *activity == latest {
+            return None;
+        }
+        *tools = count;
+        *activity = latest;
+        Some(index)
+    }
+
+    /// Marks the subagents still working as stopped (their agent is gone).
+    pub fn stop_subagents(&mut self, now: f64) -> Vec<usize> {
+        let mut changed = Vec::new();
+        for (i, e) in self.entries.iter_mut().enumerate() {
+            if let AgentEntry::Subagent { status, ended_ms, .. } = e
+                && matches!(status, AgentSubagentStatus::Running | AgentSubagentStatus::NeedsInput)
+            {
+                *status = AgentSubagentStatus::Cancelled;
+                *ended_ms = Some(now);
+                changed.push(i);
+            }
+        }
+        changed
+    }
+
+    /// Settles what an ended turn left open: running tools and pending permissions,
+    /// and records when the turn ended (`done`) on the message that started it.
+    pub fn end_turn(&mut self, done: Option<f64>) -> Vec<usize> {
+        let mut changed = Vec::new();
+        let started = self.entries.iter().rposition(|e| matches!(e, AgentEntry::User { .. }));
+        for (i, e) in self.entries.iter_mut().enumerate() {
+            match e {
+                AgentEntry::User { done_ms, .. } if Some(i) == started && done.is_some() && done_ms.is_none() => {
+                    *done_ms = done;
+                    changed.push(i);
+                }
+                AgentEntry::Tool { status, .. }
+                    if matches!(status, AgentToolStatus::Pending | AgentToolStatus::Running) =>
+                {
+                    *status = AgentToolStatus::Failed;
+                    changed.push(i);
+                }
+                AgentEntry::Permission { chosen, .. } if chosen.is_none() => {
+                    *chosen = Some("Cancelled".into());
+                    changed.push(i);
+                }
+                _ => {}
+            }
+        }
+        changed
+    }
+}
+
+fn str_field(v: &Value, key: &str) -> String {
+    v.get(key).and_then(Value::as_str).unwrap_or_default().to_owned()
+}
+
+/// The status a subagent `state` reports, with its error message; `None` for an unknown state.
+fn subagent_status(state: &Value) -> Option<(AgentSubagentStatus, Option<String>)> {
+    Some(match state.get("state")?.as_str()? {
+        "running" => (AgentSubagentStatus::Running, None),
+        "requires_action" => (AgentSubagentStatus::NeedsInput, None),
+        "idle" => match state.get("stopReason").and_then(Value::as_str) {
+            Some("cancelled") => (AgentSubagentStatus::Cancelled, None),
+            Some("error") => (
+                AgentSubagentStatus::Failed,
+                state.pointer("/error/message").and_then(Value::as_str).map(str::to_owned),
+            ),
+            _ => (AgentSubagentStatus::Done, None),
+        },
+        _ => return None,
+    })
+}
+
+/// The text of a list of content blocks, one per line.
+pub(crate) fn blocks_text(content: Option<&Value>) -> String {
+    let blocks = content.and_then(Value::as_array).map(Vec::as_slice).unwrap_or_default();
+    blocks.iter().filter_map(|b| content_text(Some(b))).collect::<Vec<_>>().join("\n")
+}
+
+pub(crate) fn content_text(content: Option<&Value>) -> Option<String> {
+    let c = content?;
+    match c.get("type").and_then(Value::as_str) {
+        Some("text") => c.get("text").and_then(Value::as_str).map(str::to_owned),
+        Some("resource_link") => c.get("uri").and_then(Value::as_str).map(str::to_owned),
+        Some("resource") => c.pointer("/resource/text").and_then(Value::as_str).map(str::to_owned),
+        _ => None,
+    }
+}
+
+fn tool_status(v: Option<&Value>) -> Option<AgentToolStatus> {
+    Some(match v?.as_str()? {
+        "pending" => AgentToolStatus::Pending,
+        "in_progress" => AgentToolStatus::Running,
+        "completed" => AgentToolStatus::Completed,
+        "failed" => AgentToolStatus::Failed,
+        _ => return None,
+    })
+}
+
+fn locations(v: Option<&Value>) -> Vec<IpcPath> {
+    v.and_then(Value::as_array)
+        .map(|a| a.iter().filter_map(|l| l.get("path")?.as_str()).map(|p| IpcPath(p.into())).collect())
+        .unwrap_or_default()
+}
+
+fn line_stats(old: &str, new: &str) -> (u32, u32) {
+    ide_vcs::diff_hunks(old, new).iter().fold((0, 0), |(a, r), h| (a + h.lines, r + h.old_lines))
+}
+
+fn tail(mut text: String) -> String {
+    if text.len() > MAX_OUTPUT {
+        let mut cut = text.len() - MAX_OUTPUT;
+        while !text.is_char_boundary(cut) {
+            cut += 1;
+        }
+        text.replace_range(..cut, "…");
+    }
+    text
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    #[test]
+    fn chunks_merge_into_one_message_until_another_entry_comes() {
+        let mut t = Timeline::default();
+        let chunk = |s: &str| json!({"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": s}});
+        assert_eq!(t.apply(&chunk("Hel")).changed, vec![0]);
+        assert_eq!(t.apply(&chunk("lo")).changed, vec![0]);
+        t.apply(&json!({"sessionUpdate": "agent_thought_chunk", "content": {"type": "text", "text": "hmm"}}));
+        t.apply(&chunk("again"));
+        assert_eq!(
+            t.entries,
+            vec![
+                AgentEntry::Agent { text: "Hello".into() },
+                AgentEntry::Thought { text: "hmm".into() },
+                AgentEntry::Agent { text: "again".into() },
+            ]
+        );
+    }
+
+    #[test]
+    fn tool_calls_update_in_place() {
+        let mut t = Timeline::default();
+        t.apply(&json!({"sessionUpdate": "tool_call", "toolCallId": "c1", "title": "Edit a.rs", "kind": "edit",
+            "status": "pending", "locations": [{"path": "/p/a.rs", "line": 3}]}));
+        let applied = t.apply(&json!({"sessionUpdate": "tool_call_update", "toolCallId": "c1", "status": "completed",
+        "content": [
+            {"type": "diff", "path": "/p/a.rs", "oldText": "a\nb\n", "newText": "a\nB\nc\n"},
+            {"type": "content", "content": {"type": "text", "text": "done"}}
+        ]}));
+        assert_eq!(applied.changed, vec![0]);
+        let AgentEntry::Tool { status, diffs, output, locations, .. } = &t.entries[0] else { panic!() };
+        assert_eq!(*status, AgentToolStatus::Completed);
+        assert_eq!(diffs, &vec![AgentToolDiff { path: IpcPath("/p/a.rs".into()), added: 2, removed: 1 }]);
+        assert_eq!(output.as_deref(), Some("done"));
+        assert_eq!(locations, &vec![IpcPath("/p/a.rs".into())]);
+        // Unknown calls are ignored.
+        assert!(t.apply(&json!({"sessionUpdate": "tool_call_update", "toolCallId": "zz"})).changed.is_empty());
+    }
+
+    #[test]
+    fn plan_is_one_entry_and_end_turn_settles_open_items() {
+        let mut t = Timeline::default();
+        let plan =
+            |s: &str| json!({"sessionUpdate": "plan", "entries": [{"content": "x", "priority": "high", "status": s}]});
+        t.apply(&plan("pending"));
+        t.push(AgentEntry::Agent { text: "between".into() });
+        assert_eq!(t.apply(&plan("completed")).changed, vec![0]);
+        t.apply(&json!({"sessionUpdate": "tool_call", "toolCallId": "c", "title": "Run", "status": "in_progress"}));
+        t.push(AgentEntry::Permission { id: 1, title: "Run?".into(), options: vec![], chosen: None });
+        assert_eq!(t.end_turn(None), vec![2, 3]);
+        let again = Timeline::from_entries(t.entries.clone());
+        assert_eq!(again.plan, Some(0));
+        assert_eq!(again.tools.get("c"), Some(&2));
+    }
+
+    #[test]
+    fn end_turn_records_when_the_last_message_was_answered() {
+        let user = |sent: f64| AgentEntry::User {
+            text: "q".into(),
+            attachments: vec![],
+            images: vec![],
+            sent_ms: Some(sent),
+            done_ms: None,
+            steered: false,
+        };
+        let mut t = Timeline::default();
+        t.push(user(1.0));
+        t.push(AgentEntry::Agent { text: "a".into() });
+        t.push(user(2.0));
+        assert_eq!(t.end_turn(Some(5.0)), vec![2]);
+        assert!(matches!(t.entries[0], AgentEntry::User { done_ms: None, .. }));
+        assert!(matches!(t.entries[2], AgentEntry::User { done_ms: Some(5.0), .. }));
+        // Settled once: a later end (a restart) doesn't move it.
+        assert_eq!(t.end_turn(Some(9.0)), Vec::<usize>::new());
+    }
+
+    #[test]
+    fn long_output_keeps_its_tail() {
+        let s = tail("é".repeat(MAX_OUTPUT));
+        assert!(s.starts_with('…') && s.len() <= MAX_OUTPUT + 3);
+    }
+}

crates/ide-agent/src/worktree.rs

@@ -0,0 +1,208 @@
+//! Task worktrees and the changes made in them.
+
+use crate::model::AgentChange;
+use ide_core::{IdeError, IdeResult, IpcPath};
+use ide_vcs::{ChangeKind, Repo};
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+use std::time::UNIX_EPOCH;
+
+pub(crate) struct Created {
+    pub path: PathBuf,
+    pub branch: String,
+    pub base: String,
+    pub base_commit: String,
+}
+
+fn repo_at(path: &Path) -> IdeResult<Repo> {
+    Repo::discover(path)?.ok_or_else(|| IdeError::unavailable(format!("{} is not in a git repository", path.display())))
+}
+
+/// The current branch (or commit when detached) and its commit.
+pub(crate) fn head_of(path: &Path) -> IdeResult<(String, String)> {
+    let info = repo_at(path)?.branch_info()?;
+    let commit = info.head_commit.ok_or_else(|| IdeError::unavailable("the repository has no commits yet"))?;
+    Ok((info.head.unwrap_or_else(|| commit.clone()), commit))
+}
+
+/// `git worktree add -b agent/<slug> <dir>/<slug> <base>`.
+pub(crate) fn create(project_root: &Path, worktrees_dir: &Path, title: &str, base: Option<&str>) -> IdeResult<Created> {
+    let repo = repo_at(project_root)?;
+    let (base, base_commit) = match base.map(str::trim).filter(|b| !b.is_empty()) {
+        Some(b) => {
+            let commit =
+                repo.merge_base(b, b)?.ok_or_else(|| IdeError::not_found(format!("no branch or revision {b}")))?;
+            (b.to_owned(), commit)
+        }
+        None => head_of(project_root)?,
+    };
+    std::fs::create_dir_all(worktrees_dir).map_err(|e| IdeError::internal(e.to_string()))?;
+    let branch_exists = |s: &str| {
+        let r = format!("refs/heads/agent/{s}");
+        repo.merge_base(&r, &r).ok().flatten().is_some()
+    };
+    let slug = unique_slug(&slugify(title), |s| worktrees_dir.join(s).exists() || branch_exists(s));
+    let path = worktrees_dir.join(&slug);
+    let branch = format!("agent/{slug}");
+    repo.add_worktree(&path, &base_commit, Some(&branch))?;
+    Ok(Created { path, branch, base, base_commit })
+}
+
+pub(crate) fn remove(project_root: &Path, path: &Path) -> IdeResult<()> {
+    repo_at(project_root)?.remove_worktree(path, true)
+}
+
+/// Files under `cwd` that differ from `base` (untracked files included), with line counts.
+/// Outside a repository there is nothing to compare against: no changes.
+pub(crate) fn changes(cwd: &Path, base: &str) -> IdeResult<Vec<AgentChange>> {
+    let Some(repo) = Repo::discover(cwd)? else { return Ok(Vec::new()) };
+    let root = repo.root().to_path_buf();
+    let stats = repo.numstat_with_worktree(base)?;
+    let stat = |rel: &str| stats.iter().find(|(p, ..)| p == rel).map_or((0, 0), |&(_, a, r)| (a, r));
+    let mut out: Vec<AgentChange> = repo
+        .diff_with_worktree(base)?
+        .into_iter()
+        .map(|f| {
+            let (added, removed) = stat(&f.path);
+            AgentChange { path: IpcPath(root.join(&f.path)), rel_path: f.path, kind: f.kind, added, removed }
+        })
+        .collect();
+    for s in repo.status()? {
+        if s.unstaged == Some(ChangeKind::Untracked) && !out.iter().any(|c| c.rel_path == s.rel_path) {
+            let added = std::fs::read_to_string(&*s.path).map_or(0, |t| t.lines().count() as u32);
+            out.push(AgentChange { path: s.path, rel_path: s.rel_path, kind: ChangeKind::Added, added, removed: 0 });
+        }
+    }
+    out.sort_by(|a, b| a.rel_path.cmp(&b.rel_path));
+    Ok(out)
+}
+
+/// Size and modification time of a file, `None` once it is gone.
+pub(crate) type Stamp = Option<(u64, u128)>;
+
+fn stamp(path: &Path) -> Stamp {
+    let meta = std::fs::metadata(path).ok()?;
+    let modified = meta.modified().ok()?.duration_since(UNIX_EPOCH).ok()?.as_nanos();
+    Some((meta.len(), modified))
+}
+
+/// The files already changed in `cwd` against `HEAD`, stamped so later edits to them show.
+pub(crate) fn snapshot(cwd: &Path) -> IdeResult<BTreeMap<String, Stamp>> {
+    Ok(changes(cwd, "HEAD")?.into_iter().map(|c| (c.rel_path, stamp(&c.path))).collect())
+}
+
+/// Drops the changes that were there before the task and haven't been touched since.
+pub(crate) fn without_untouched(changes: Vec<AgentChange>, before: &BTreeMap<String, Stamp>) -> Vec<AgentChange> {
+    changes.into_iter().filter(|c| before.get(&c.rel_path).is_none_or(|s| *s != stamp(&c.path))).collect()
+}
+
+pub(crate) fn file_at(cwd: &Path, path: &Path, rev: &str) -> IdeResult<Option<String>> {
+    let Some(repo) = Repo::discover(cwd)? else { return Ok(None) };
+    let encoding = match ide_vfs::load_text(path) {
+        Ok(loaded) => encoding_rs::Encoding::for_label(loaded.encoding.as_bytes()).unwrap_or(encoding_rs::UTF_8),
+        Err(_) => ide_vfs::detect_encoding(&repo.file_bytes_at(path, Some(rev))?.unwrap_or_default(), None),
+    };
+    repo.file_at(path, Some(rev), encoding)
+}
+
+/// A short ASCII branch-safe name from the task title.
+pub(crate) fn slugify(title: &str) -> String {
+    let mut out = String::new();
+    for c in title.chars() {
+        if c.is_ascii_alphanumeric() {
+            out.push(c.to_ascii_lowercase());
+        } else if !out.is_empty() && !out.ends_with('-') {
+            out.push('-');
+        }
+        if out.len() >= 32 {
+            break;
+        }
+    }
+    let out = out.trim_matches('-');
+    if out.is_empty() { "task".to_owned() } else { out.to_owned() }
+}
+
+fn unique_slug(base: &str, taken: impl Fn(&str) -> bool) -> String {
+    if !taken(base) {
+        return base.to_owned();
+    }
+    (2..).map(|n| format!("{base}-{n}")).find(|s| !taken(s)).expect("unbounded")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn slugs_are_branch_safe() {
+        assert_eq!(slugify("Fix lexer UTF-16 columns!"), "fix-lexer-utf-16-columns");
+        assert_eq!(slugify("修复 lexer 越界"), "lexer");
+        assert_eq!(slugify("修复越界"), "task");
+        assert_eq!(slugify(&"a".repeat(50)).len(), 32);
+        assert_eq!(unique_slug("x", |s| s == "x" || s == "x-2"), "x-3");
+    }
+
+    #[test]
+    fn outside_a_repository_there_is_nothing_to_compare() {
+        let tmp = tempfile::tempdir().unwrap();
+        let dir = tmp.path().join("plain");
+        std::fs::create_dir(&dir).unwrap();
+        std::fs::write(dir.join("a.txt"), "one\n").unwrap();
+
+        assert!(changes(&dir, "HEAD").unwrap().is_empty());
+        assert!(snapshot(&dir).unwrap().is_empty());
+        assert_eq!(file_at(&dir, &dir.join("a.txt"), "HEAD").unwrap(), None);
+        assert!(create(&dir, &tmp.path().join("wt"), "Edit A", None).is_err());
+        assert!(remove(&dir, &dir).is_err());
+    }
+
+    fn git(dir: &Path, args: &[&str]) {
+        let ok = std::process::Command::new("git")
+            .args(["-c", "user.name=t", "-c", "user.email=t@t", "-c", "commit.gpgsign=false"])
+            .args(args)
+            .current_dir(dir)
+            .status()
+            .unwrap()
+            .success();
+        assert!(ok, "git {args:?}");
+    }
+
+    #[test]
+    fn worktree_changes_are_listed_against_the_base() {
+        let tmp = tempfile::tempdir().unwrap();
+        let repo = tmp.path().join("repo");
+        std::fs::create_dir(&repo).unwrap();
+        git(&repo, &["init", "-q", "-b", "main"]);
+        std::fs::write(repo.join("a.txt"), "one\ntwo\n").unwrap();
+        git(&repo, &["add", "."]);
+        git(&repo, &["commit", "-q", "-m", "init"]);
+
+        let created = create(&repo, &tmp.path().join("wt"), "Edit A", None).unwrap();
+        assert_eq!(created.branch, "agent/edit-a");
+        assert_eq!(created.base, "main");
+        std::fs::write(created.path.join("a.txt"), "one\nTWO\nthree\n").unwrap();
+        std::fs::write(created.path.join("new.txt"), "x\ny\n").unwrap();
+
+        let got = changes(&created.path, &created.base_commit).unwrap();
+        let summary: Vec<_> = got.iter().map(|c| (c.rel_path.as_str(), c.kind, c.added, c.removed)).collect();
+        assert_eq!(summary, [("a.txt", ChangeKind::Modified, 2, 1), ("new.txt", ChangeKind::Added, 2, 0)]);
+        let base_text = file_at(&created.path, &created.path.join("a.txt"), &created.base_commit).unwrap();
+        assert_eq!(base_text.as_deref(), Some("one\ntwo\n"));
+
+        // Changes already in the checkout drop out until they are edited again.
+        let before = snapshot(&created.path).unwrap();
+        std::fs::write(created.path.join("b.txt"), "b\n").unwrap();
+        let rels = |c: Vec<AgentChange>| c.into_iter().map(|c| c.rel_path).collect::<Vec<_>>();
+        let after = changes(&created.path, "HEAD").unwrap();
+        assert_eq!(rels(without_untouched(after, &before)), ["b.txt"]);
+        std::thread::sleep(std::time::Duration::from_millis(10));
+        std::fs::write(created.path.join("new.txt"), "x\ny\nz\n").unwrap();
+        let after = changes(&created.path, "HEAD").unwrap();
+        assert_eq!(rels(without_untouched(after, &before)), ["b.txt", "new.txt"]);
+
+        // A second task with the same title gets its own worktree.
+        assert_eq!(create(&repo, &tmp.path().join("wt"), "Edit A", None).unwrap().branch, "agent/edit-a-2");
+        remove(&repo, &created.path).unwrap();
+        assert!(!created.path.exists());
+    }
+}

crates/ide-agent/tests/fixtures/acp-v2/cancel.jsonl

@@ -0,0 +1,18 @@
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {"protocolVersion": 2, "info": {"name": "OpenIDEA", "version": "0.0.0"}, "capabilities": {}, "clientCapabilities": {"fs": {"readTextFile": false, "writeTextFile": false}, "terminal": false, "subagents": {}}, "clientInfo": {"name": "OpenIDEA", "version": "0.0.0"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 1, "result": {"protocolVersion": 2, "info": {"name": "@agentclientprotocol/claude-agent-acp", "title": "Claude Agent", "version": "0.97.0"}, "capabilities": {"session": {"prompt": {"image": {}, "embeddedContext": {}}, "mcp": {"stdio": {}, "http": {}}, "delete": {}, "fork": {}, "additionalDirectories": {}, "systemPrompt": {"mode": {"override": {}}}}, "providers": {}, "_meta": {"claudeCode": {"promptQueueing": true}, "authStatus": {}}}, "authMethods": []}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 2, "method": "session/new", "params": {"cwd": "/work/proj", "mcpServers": []}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 2, "result": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "configOptions": [{"name": "Mode", "description": "Session permission mode", "category": "mode", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Manual", "description": "Always ask before making changes"}, {"value": "acceptEdits", "name": "Accept edits", "description": "Automatically accept all file edits"}, {"value": "plan", "name": "Plan", "description": "Create a plan before making changes"}, {"value": "auto", "name": "Auto", "description": "Claude handles permission decisions"}, {"value": "bypassPermissions", "name": "Bypass permissions", "description": "Accepts all permissions"}], "configId": "mode"}, {"name": "Model", "description": "AI model to use", "category": "model", "type": "select", "currentValue": "opus", "options": [{"value": "default", "name": "Default (recommended)", "description": "Sonnet 5.5"}, {"value": "opus", "name": "Opus 5.5", "description": "For complex work and everyday tasks"}, {"value": "fable", "name": "Fable 5.1", "description": "For your toughest challenges"}, {"value": "sonnet", "name": "Sonnet 5.5", "description": "Most efficient for simpler tasks"}, {"value": "haiku", "name": "Haiku 5.5", "description": "Fastest for quick answers"}, {"value": "claude-haiku-4-5-20251001", "name": "Haiku 4.5", "description": "Fastest for quick answers"}, {"value": "claude-sonnet-5", "name": "Sonnet 5", "description": "Efficient for routine tasks"}, {"value": "claude-opus-5", "name": "Opus 5", "description": "Best for everyday, complex tasks"}, {"value": "claude-fable-5", "name": "Fable 5", "description": "Most capable for your hardest and longest-running tasks"}, {"value": "claude-opus-4-8", "name": "Opus 4.8", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-7", "name": "Opus 4.7", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-6", "name": "Opus 4.6", "description": "Best for everyday, complex tasks"}, {"value": "claude-sonnet-4-6", "name": "Sonnet 4.6", "description": "Efficient for routine tasks"}], "configId": "model"}, {"name": "Effort", "description": "Available effort levels for this model", "category": "thought_level", "type": "select", "currentValue": "medium", "options": [{"value": "default", "name": "Default"}, {"value": "low", "name": "Low"}, {"value": "medium", "name": "Medium"}, {"value": "high", "name": "High"}, {"value": "xhigh", "name": "Xhigh"}, {"value": "max", "name": "Max"}], "configId": "effort"}, {"name": "Fast mode", "description": "Faster responses on supported models", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "fast"}, {"name": "Ultracode", "description": "Dynamic workflows on every task, at any effort level", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "ultracode"}, {"name": "Agent", "description": "Main-thread agent persona", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Default", "description": "Standard Claude Code agent"}, {"value": "code-simplifier:code-simplifier", "name": "code-simplifier:code-simplifier", "description": "Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise."}, {"value": "sentry-skills:code-simplifier", "name": "sentry-skills:code-simplifier", "description": "Agent from sentry-skills plugin"}, {"value": "sentry-skills:senpai", "name": "sentry-skills:senpai", "description": "Agent from sentry-skills plugin"}], "configId": "agent"}], "availableCommands": [{"name": "find-skills", "description": "Helps users discover and install agent skills when they ask questions like \"how do I do X\", \"find a skill for X\", \"is there a skill that can...\", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill. (user)"}, {"name": "hyperframes", "description": "Read first to make, edit, animate or render any video with HyperFrames (HTML rendered to video), including launch films, explainers, music videos, charts, maps, vertical clips, title cards, captions and overlays. Holds the render contract, the work loop and what each kind of video needs. (user)"}]}}}
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crates/ide-agent/tests/fixtures/acp-v2/initialize-v1.jsonl

@@ -0,0 +1,2 @@
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {"protocolVersion": 2, "info": {"name": "OpenIDEA", "version": "0.0.0"}, "capabilities": {}, "clientCapabilities": {"fs": {"readTextFile": false, "writeTextFile": false}, "terminal": false, "subagents": {}}, "clientInfo": {"name": "OpenIDEA", "version": "0.0.0"}}}}
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crates/ide-agent/tests/fixtures/acp-v2/resume.jsonl

@@ -0,0 +1,21 @@
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 1, "result": {"protocolVersion": 2, "info": {"name": "@agentclientprotocol/claude-agent-acp", "title": "Claude Agent", "version": "0.97.0"}, "capabilities": {"session": {"prompt": {"image": {}, "embeddedContext": {}}, "mcp": {"stdio": {}, "http": {}}, "delete": {}, "fork": {}, "additionalDirectories": {}, "systemPrompt": {"mode": {"override": {}}}}, "providers": {}, "_meta": {"claudeCode": {"promptQueueing": true}, "authStatus": {}}}, "authMethods": []}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "state_update", "state": "idle"}}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "terminal_update", "terminalId": "toolu_01H6aZs4sGpLd5bWRZz8b8Mu", "exitStatus": {"exitCode": 1}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01H6aZs4sGpLd5bWRZz8b8Mu", "status": "failed", "content": [{"type": "terminal", "terminalId": "toolu_01H6aZs4sGpLd5bWRZz8b8Mu"}], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01QuF3wSLUeeMp5QTuiNoTBn", "name": "Write", "rawInput": {"file_path": "/work/proj/note.txt", "content": "hi\n"}, "status": "pending", "title": "Write /work/proj/note.txt", "kind": "edit", "locations": [{"path": "/work/proj/note.txt"}], "content": [], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01QuF3wSLUeeMp5QTuiNoTBn", "status": "completed", "rawOutput": "File created successfully at: /work/proj/note.txt (file state is current in your context — no need to Read it back)", "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"messageId": "msg_011CgUfqgchjLSPjUYMxwvid", "content": [], "sessionUpdate": "agent_message"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "done"}, "messageId": "msg_011CgUfqgchjLSPjUYMxwvid"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "state_update", "state": "idle"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 3, "result": {"configOptions": [{"name": "Mode", "description": "Session permission mode", "category": "mode", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Manual", "description": "Always ask before making changes"}, {"value": "acceptEdits", "name": "Accept edits", "description": "Automatically accept all file edits"}, {"value": "plan", "name": "Plan", "description": "Create a plan before making changes"}, {"value": "auto", "name": "Auto", "description": "Claude handles permission decisions"}, {"value": "bypassPermissions", "name": "Bypass permissions", "description": "Accepts all permissions"}], "configId": "mode"}, {"name": "Model", "description": "AI model to use", "category": "model", "type": "select", "currentValue": "opus", "options": [{"value": "default", "name": "Default (recommended)", "description": "Sonnet 5.5"}, {"value": "opus", "name": "Opus 5.5", "description": "For complex work and everyday tasks"}, {"value": "fable", "name": "Fable 5.1", "description": "For your toughest challenges"}, {"value": "sonnet", "name": "Sonnet 5.5", "description": "Most efficient for simpler tasks"}, {"value": "haiku", "name": "Haiku 5.5", "description": "Fastest for quick answers"}, {"value": "claude-haiku-4-5-20251001", "name": "Haiku 4.5", "description": "Fastest for quick answers"}, {"value": "claude-sonnet-5", "name": "Sonnet 5", "description": "Efficient for routine tasks"}, {"value": "claude-opus-5", "name": "Opus 5", "description": "Best for everyday, complex tasks"}, {"value": "claude-fable-5", "name": "Fable 5", "description": "Most capable for your hardest and longest-running tasks"}, {"value": "claude-opus-4-8", "name": "Opus 4.8", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-7", "name": "Opus 4.7", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-6", "name": "Opus 4.6", "description": "Best for everyday, complex tasks"}, {"value": "claude-sonnet-4-6", "name": "Sonnet 4.6", "description": "Efficient for routine tasks"}], "configId": "model"}, {"name": "Effort", "description": "Available effort levels for this model", "category": "thought_level", "type": "select", "currentValue": "medium", "options": [{"value": "default", "name": "Default"}, {"value": "low", "name": "Low"}, {"value": "medium", "name": "Medium"}, {"value": "high", "name": "High"}, {"value": "xhigh", "name": "Xhigh"}, {"value": "max", "name": "Max"}], "configId": "effort"}, {"name": "Fast mode", "description": "Faster responses on supported models", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "fast"}, {"name": "Ultracode", "description": "Dynamic workflows on every task, at any effort level", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "ultracode"}, {"name": "Agent", "description": "Main-thread agent persona", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Default", "description": "Standard Claude Code agent"}, {"value": "code-simplifier:code-simplifier", "name": "code-simplifier:code-simplifier", "description": "Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise."}, {"value": "sentry-skills:code-simplifier", "name": "sentry-skills:code-simplifier", "description": "Agent from sentry-skills plugin"}, {"value": "sentry-skills:senpai", "name": "sentry-skills:senpai", "description": "Agent from sentry-skills plugin"}], "configId": "agent"}], "availableCommands": [{"name": "find-skills", "description": "Helps users discover and install agent skills when they ask questions like \"how do I do X\", \"find a skill for X\", \"is there a skill that can...\", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill. (user)"}, {"name": "hyperframes", "description": "Read first to make, edit, animate or render any video with HyperFrames (HTML rendered to video), including launch films, explainers, music videos, charts, maps, vertical clips, title cards, captions and overlays. Holds the render contract, the work loop and what each kind of video needs. (user)"}]}}}

crates/ide-agent/tests/fixtures/acp-v2/subagent.jsonl

@@ -0,0 +1,79 @@
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {"protocolVersion": 2, "info": {"name": "OpenIDEA", "version": "0.0.0"}, "capabilities": {}, "clientCapabilities": {"fs": {"readTextFile": false, "writeTextFile": false}, "terminal": false, "subagents": {}}, "clientInfo": {"name": "OpenIDEA", "version": "0.0.0"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 1, "result": {"protocolVersion": 2, "info": {"name": "@agentclientprotocol/claude-agent-acp", "title": "Claude Agent", "version": "0.97.0"}, "capabilities": {"session": {"prompt": {"image": {}, "embeddedContext": {}}, "mcp": {"stdio": {}, "http": {}}, "delete": {}, "fork": {}, "additionalDirectories": {}, "systemPrompt": {"mode": {"override": {}}}}, "providers": {}, "_meta": {"claudeCode": {"promptQueueing": true}, "authStatus": {}}}, "authMethods": []}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 2, "method": "session/new", "params": {"cwd": "/work/proj", "mcpServers": []}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 2, "result": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "configOptions": [{"name": "Mode", "description": "Session permission mode", "category": "mode", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Manual", "description": "Always ask before making changes"}, {"value": "acceptEdits", "name": "Accept edits", "description": "Automatically accept all file edits"}, {"value": "plan", "name": "Plan", "description": "Create a plan before making changes"}, {"value": "auto", "name": "Auto", "description": "Claude handles permission decisions"}, {"value": "bypassPermissions", "name": "Bypass permissions", "description": "Accepts all permissions"}], "configId": "mode"}, {"name": "Model", "description": "AI model to use", "category": "model", "type": "select", "currentValue": "opus", "options": [{"value": "default", "name": "Default (recommended)", "description": "Sonnet 5.5"}, {"value": "opus", "name": "Opus 5.5", "description": "For complex work and everyday tasks"}, {"value": "fable", "name": "Fable 5.1", "description": "For your toughest challenges"}, {"value": "sonnet", "name": "Sonnet 5.5", "description": "Most efficient for simpler tasks"}, {"value": "haiku", "name": "Haiku 5.5", "description": "Fastest for quick answers"}, {"value": "claude-haiku-4-5-20251001", "name": "Haiku 4.5", "description": "Fastest for quick answers"}, {"value": "claude-sonnet-5", "name": "Sonnet 5", "description": "Efficient for routine tasks"}, {"value": "claude-opus-5", "name": "Opus 5", "description": "Best for everyday, complex tasks"}, {"value": "claude-fable-5", "name": "Fable 5", "description": "Most capable for your hardest and longest-running tasks"}, {"value": "claude-opus-4-8", "name": "Opus 4.8", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-7", "name": "Opus 4.7", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-6", "name": "Opus 4.6", "description": "Best for everyday, complex tasks"}, {"value": "claude-sonnet-4-6", "name": "Sonnet 4.6", "description": "Efficient for routine tasks"}], "configId": "model"}, {"name": "Effort", "description": "Available effort levels for this model", "category": "thought_level", "type": "select", "currentValue": "medium", "options": [{"value": "default", "name": "Default"}, {"value": "low", "name": "Low"}, {"value": "medium", "name": "Medium"}, {"value": "high", "name": "High"}, {"value": "xhigh", "name": "Xhigh"}, {"value": "max", "name": "Max"}], "configId": "effort"}, {"name": "Fast mode", "description": "Faster responses on supported models", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "fast"}, {"name": "Ultracode", "description": "Dynamic workflows on every task, at any effort level", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "ultracode"}, {"name": "Agent", "description": "Main-thread agent persona", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Default", "description": "Standard Claude Code agent"}, {"value": "code-simplifier:code-simplifier", "name": "code-simplifier:code-simplifier", "description": "Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise."}, {"value": "sentry-skills:code-simplifier", "name": "sentry-skills:code-simplifier", "description": "Agent from sentry-skills plugin"}, {"value": "sentry-skills:senpai", "name": "sentry-skills:senpai", "description": "Agent from sentry-skills plugin"}], "configId": "agent"}], "availableCommands": [{"name": "find-skills", "description": "Helps users discover and install agent skills when they ask questions like \"how do I do X\", \"find a skill for X\", \"is there a skill that can...\", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill. (user)"}, {"name": "hyperframes", "description": "Read first to make, edit, animate or render any video with HyperFrames (HTML rendered to video), including launch films, explainers, music videos, charts, maps, vertical clips, title cards, captions and overlays. Holds the render contract, the work loop and what each kind of video needs. (user)"}]}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 3, "method": "session/set_config_option", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "configId": "model", "type": "id", "value": "haiku"}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 3, "result": {"configOptions": [{"name": "Mode", "description": "Session permission mode", "category": "mode", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Manual", "description": "Always ask before making changes"}, {"value": "acceptEdits", "name": "Accept edits", "description": "Automatically accept all file edits"}, {"value": "plan", "name": "Plan", "description": "Create a plan before making changes"}, {"value": "auto", "name": "Auto", "description": "Claude handles permission decisions"}, {"value": "bypassPermissions", "name": "Bypass permissions", "description": "Accepts all permissions"}], "configId": "mode"}, {"name": "Model", "description": "AI model to use", "category": "model", "type": "select", "currentValue": "haiku", "options": [{"value": "default", "name": "Default (recommended)", "description": "Sonnet 5.5"}, {"value": "opus", "name": "Opus 5.5", "description": "For complex work and everyday tasks"}, {"value": "fable", "name": "Fable 5.1", "description": "For your toughest challenges"}, {"value": "sonnet", "name": "Sonnet 5.5", "description": "Most efficient for simpler tasks"}, {"value": "haiku", "name": "Haiku 5.5", "description": "Fastest for quick answers"}, {"value": "claude-haiku-4-5-20251001", "name": "Haiku 4.5", "description": "Fastest for quick answers"}, {"value": "claude-sonnet-5", "name": "Sonnet 5", "description": "Efficient for routine tasks"}, {"value": "claude-opus-5", "name": "Opus 5", "description": "Best for everyday, complex tasks"}, {"value": "claude-fable-5", "name": "Fable 5", "description": "Most capable for your hardest and longest-running tasks"}, {"value": "claude-opus-4-8", "name": "Opus 4.8", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-7", "name": "Opus 4.7", "description": "Best for everyday, complex tasks"}, {"value": "claude-opus-4-6", "name": "Opus 4.6", "description": "Best for everyday, complex tasks"}, {"value": "claude-sonnet-4-6", "name": "Sonnet 4.6", "description": "Efficient for routine tasks"}], "configId": "model"}, {"name": "Effort", "description": "Available effort levels for this model", "category": "thought_level", "type": "select", "currentValue": "high", "options": [{"value": "default", "name": "Default"}, {"value": "low", "name": "Low"}, {"value": "medium", "name": "Medium"}, {"value": "high", "name": "High"}, {"value": "xhigh", "name": "Xhigh"}, {"value": "max", "name": "Max"}], "configId": "effort"}, {"name": "Ultracode", "description": "Dynamic workflows on every task, at any effort level", "category": "model_config", "type": "boolean", "currentValue": false, "configId": "ultracode"}, {"name": "Agent", "description": "Main-thread agent persona", "type": "select", "currentValue": "default", "options": [{"value": "default", "name": "Default", "description": "Standard Claude Code agent"}, {"value": "code-simplifier:code-simplifier", "name": "code-simplifier:code-simplifier", "description": "Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise."}, {"value": "sentry-skills:code-simplifier", "name": "sentry-skills:code-simplifier", "description": "Agent from sentry-skills plugin"}, {"value": "sentry-skills:senpai", "name": "sentry-skills:senpai", "description": "Agent from sentry-skills plugin"}], "configId": "agent"}]}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 4, "method": "session/prompt", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "prompt": [{"type": "text", "text": "Do these steps in order. 1) Track two tasks with your task/todo tracking tool: 'list files' and 'answer'. 2) Use the Agent tool to launch a general-purpose subagent with the prompt 'List the files in the current directory with the Bash ls command and report them'. 3) Mark both tasks completed. 4) Reply with the file names."}]}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "user_message", "messageId": "f2dbb48b-7edc-47ea-a36e-34e738bf5027", "content": [{"text": "Do these steps in order. 1) Track two tasks with your task/todo tracking tool: 'list files' and 'answer'. 2) Use the Agent tool to launch a general-purpose subagent with the prompt 'List the files in the current directory with the Bash ls command and report them'. 3) Mark both tasks completed. 4) Reply with the file names.", "type": "text"}]}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 4, "result": {"messageId": "f2dbb48b-7edc-47ea-a36e-34e738bf5027"}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "state_update", "state": "running"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "available_commands_update", "availableCommands": [{"name": "find-skills", "description": "Helps users discover and install agent skills when they ask questions like \"how do I do X\", \"find a skill for X\", \"is there a skill that can...\", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill. (user)"}, {"name": "hyperframes", "description": "Read first to make, edit, animate or render any video with HyperFrames (HTML rendered to video), including launch films, explainers, music videos, charts, maps, vertical clips, title cards, captions and overlays. Holds the render contract, the work loop and what each kind of video needs. (user)"}]}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "session_info_update", "title": "Todo tracking and subagent file listing", "updatedAt": "2026-10-28T12:55:46.512Z"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 27824, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "available_commands_update", "availableCommands": [{"name": "find-skills", "description": "Helps users discover and install agent skills when they ask questions like \"how do I do X\", \"find a skill for X\", \"is there a skill that can...\", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill. (user)"}, {"name": "hyperframes", "description": "Read first to make, edit, animate or render any video with HyperFrames (HTML rendered to video), including launch films, explainers, music videos, charts, maps, vertical clips, title cards, captions and overlays. Holds the render contract, the work loop and what each kind of video needs. (user)"}]}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_01T8LbYANyWaDe6Kb3pdJ7Qy", "name": "ToolSearch", "rawInput": {}, "status": "pending", "title": "ToolSearch", "kind": "other", "content": [], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_01T8LbYANyWaDe6Kb3pdJ7Qy", "rawInput": {"query": "todo task tracking"}, "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_01T8LbYANyWaDe6Kb3pdJ7Qy", "rawInput": {"query": "todo task tracking", "max_results": 5}, "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 28064, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_01T8LbYANyWaDe6Kb3pdJ7Qy", "status": "completed", "rawOutput": [{"type": "tool_reference", "tool_name": "TaskStop"}, {"type": "tool_reference", "tool_name": "CronCreate"}, {"type": "tool_reference", "tool_name": "EnterPlanMode"}, {"type": "tool_reference", "tool_name": "EnterWorktree"}, {"type": "tool_reference", "tool_name": "ExitPlanMode"}], "content": [{"type": "content", "content": {"type": "text", "text": "Tool: TaskStop"}}, {"type": "content", "content": {"type": "text", "text": "Tool: CronCreate"}}, {"type": "content", "content": {"type": "text", "text": "Tool: EnterPlanMode"}}, {"type": "content", "content": {"type": "text", "text": "Tool: EnterWorktree"}}, {"type": "content", "content": {"type": "text", "text": "Tool: ExitPlanMode"}}], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 37635, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_013VE3utwYENPZhodwJCbuN9", "name": "ToolSearch", "rawInput": {}, "status": "pending", "title": "ToolSearch", "kind": "other", "content": [], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_013VE3utwYENPZhodwJCbuN9", "rawInput": {"query": "select:TodoWrite,TaskCreate,TaskUpdate"}, "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_013VE3utwYENPZhodwJCbuN9", "rawInput": {"query": "select:TodoWrite,TaskCreate,TaskUpdate", "max_results": 5}, "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 37812, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"toolCallId": "toolu_013VE3utwYENPZhodwJCbuN9", "status": "completed", "rawOutput": "No matching deferred tools found", "content": [{"type": "content", "content": {"type": "text", "text": "No matching deferred tools found"}}], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 37868, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "session_message", "messageId": "toolu_011Lf9AUZDG1DHbPvpXbhBXE", "senderSessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "recipientSessionId": "a0360979d934c7b55", "content": [{"type": "text", "text": "List the files in the current directory with the Bash ls command and report them"}], "recipientMessageId": "toolu_011Lf9AUZDG1DHbPvpXbhBXE"}}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "a0360979d934c7b55", "update": {"sessionUpdate": "terminal_update", "terminalId": "toolu_01Q8md8yrGpUb8BKr8fNDqDJ", "command": "ls"}}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "a0360979d934c7b55", "update": {"sessionUpdate": "terminal_update", "terminalId": "toolu_01Q8md8yrGpUb8BKr8fNDqDJ", "output": {"data": "bm90ZS50eHQ="}}}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 38443, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "当"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "前目录里"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "只有一个文件：`"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "note.txt`。\n\n两"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "个任务我"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "没能"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "跟踪："}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "这"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "个会话里"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "没有可用的任务/"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "待办"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "工具（TodoWr"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "ite、"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "TaskCreate、"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "TaskUpdate "}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "都"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "搜不"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "到），所以\""}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "list files"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "\"和"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "\"answer\"没"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "有被"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "记录，也就"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "谈不上标记完"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "成。文"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "件列表来"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "自子"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "代理的 `ls`"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": " 结果，我"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "没有自"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "己复"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "核。"}, "messageId": "msg_011CgUftt38G9C1yBTYhs366"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 38714, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "usage_update", "used": 38714, "size": 1000000, "cost": {"amount": 0.01052372, "currency": "USD"}, "_meta": {"_claude/origin": {"kind": "human"}, "_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "f5dda22c-5c54-459f-b3f9-b1c94e8e7806", "update": {"sessionUpdate": "state_update", "state": "idle", "stopReason": "end_turn", "usage": {"inputTokens": 8, "outputTokens": 955, "cachedReadTokens": 115732, "cachedWriteTokens": 26011, "totalTokens": 142706}, "_meta": {"quota": {"token_count": {"totalTokens": 142706, "inputTokens": 8, "cachedInputTokens": 115732, "cachedWriteTokens": 26011, "outputTokens": 955, "reasoningOutputTokens": 0}, "model_usage": [{"model": "claude-haiku-5-5", "token_count": {"totalTokens": 193547, "inputTokens": 1292, "cachedInputTokens": 139332, "cachedWriteTokens": 51763, "outputTokens": 1160, "reasoningOutputTokens": 0}}]}}}}}}

crates/ide-agent/tests/fixtures/acp-v2/turn.jsonl

@@ -0,0 +1,44 @@
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crates/ide-agent/tests/fixtures/acp/claude-acp/config.json

@@ -0,0 +1 @@
+[{"id": "model", "value": "haiku"}]

crates/ide-agent/tests/fixtures/acp/claude-acp@v1/multi_turn.jsonl

@@ -0,0 +1,27 @@
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crates/ide-agent/tests/fixtures/acp/claude-acp@v1/permission_allow.jsonl

@@ -0,0 +1,32 @@
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crates/ide-agent/tests/fixtures/acp/claude-acp@v1/permission_decline.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v1/queued_turn.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v1/resume.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v1/turn_interrupt.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v2/multi_turn.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v2/permission_allow.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v2/permission_decline.jsonl

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crates/ide-agent/tests/fixtures/acp/claude-acp@v2/queued_turn.jsonl

@@ -0,0 +1,30 @@
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crates/ide-agent/tests/fixtures/acp/claude-acp@v2/turn_interrupt.jsonl

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crates/ide-agent/tests/fixtures/claude/interrupt.jsonl

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crates/ide-agent/tests/fixtures/claude/simple.jsonl

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crates/ide-agent/tests/fixtures/claude/steer.jsonl

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crates/ide-agent/tests/fixtures/codex/approvals.jsonl

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crates/ide-agent/tests/fixtures/codex/auth_failure.jsonl

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crates/ide-agent/tests/fixtures/codex/simple.jsonl

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crates/ide-agent/tests/fixtures/codex/subagent.jsonl

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crates/ide-agent/tests/fixtures/codex/usage_limit.jsonl

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+{"dir":"out","frame":{"id":4,"method":"turn/start"}}
+{"dir":"in","frame":{"id":4,"result":{"turn":{"id":"01a18300-0000-7000-8000-000000000001","items":[],"itemsView":"notLoaded","status":"inProgress","error":null,"startedAt":1793193000,"completedAt":null,"durationMs":null}}}}
+{"dir":"in","frame":{"method":"turn/started","params":{"threadId":"01a18300-0000-7000-8000-000000000001","turn":{"id":"01a18300-0000-7000-8000-000000000001","items":[],"itemsView":"notLoaded","status":"inProgress","error":null,"startedAt":1793193000,"completedAt":null,"durationMs":null}}}}
+{"dir":"in","frame":{"method":"item/started","params":{"item":{"type":"userMessage","id":"u-01a18300-0000-7000-8000-000000000001","clientId":null,"content":[{"type":"text","text":"Reply with the single word: hi","text_elements":[]}]},"threadId":"01a18300-0000-7000-8000-000000000001","turnId":"01a18300-0000-7000-8000-000000000001","startedAtMs":1793193001000}}}
+{"dir":"in","frame":{"method":"item/completed","params":{"item":{"type":"userMessage","id":"u-01a18300-0000-7000-8000-000000000001","clientId":null,"content":[{"type":"text","text":"Reply with the single word: hi","text_elements":[]}]},"threadId":"01a18300-0000-7000-8000-000000000001","turnId":"01a18300-0000-7000-8000-000000000001","completedAtMs":1793193001000}}}
+{"dir":"in","frame":{"method":"error","params":{"threadId":"01a18300-0000-7000-8000-000000000001","turnId":"01a18300-0000-7000-8000-000000000001","willRetry":false,"error":{"message":"You've hit your usage limit. Try again later.","codexErrorInfo":"usageLimitExceeded","additionalDetails":null}}}}
+{"dir":"in","frame":{"method":"thread/status/changed","params":{"threadId":"01a18300-0000-7000-8000-000000000001","status":{"type":"idle"}}}}
+{"dir":"in","frame":{"method":"turn/completed","params":{"threadId":"01a18300-0000-7000-8000-000000000001","turn":{"id":"01a18300-0000-7000-8000-000000000001","items":[],"itemsView":"notLoaded","status":"failed","error":{"message":"You've hit your usage limit. Try again later.","codexErrorInfo":"usageLimitExceeded","additionalDetails":null},"startedAt":1793193000,"completedAt":null,"durationMs":null}}}}

crates/ide-build/examples/model.rs

@@ -19,7 +19,7 @@ fn main() {
         eprintln!("synced in {:?}: {r:?}", started.elapsed());
     }
     let started = std::time::Instant::now();
-    let model = ide_build::load(&root, &cache);
+    let model = ide_build::load(&root, &cache, None);
     println!("{}", serde_json::to_string_pretty(&model).unwrap());
     eprintln!("loaded in {:?}", started.elapsed());
 }

crates/ide-build/src/application_update.rs

@@ -0,0 +1,218 @@
+//! Resource processing by the project's build tool, then publishing to the live JVM's output directory.
+use crate::BuildModel;
+use ide_core::{IdeError, IdeResult};
+use std::collections::BTreeMap;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+pub struct ResourceBuild {
+    pub command: String,
+    pub args: Vec<String>,
+    pub cwd: String,
+    pub env: BTreeMap<String, String>,
+    pub kind: &'static str,
+}
+
+fn literal(value: &str) -> String {
+    format!("'{}'", value.replace('\\', "\\\\").replace('\'', "\\'"))
+}
+
+pub fn plan(root: &Path, model: &BuildModel, module: &Path, cache: &Path) -> IdeResult<ResourceBuild> {
+    fs::create_dir_all(cache)?;
+    let manifest = cache.join("resource-output.txt");
+    if manifest.exists() {
+        fs::remove_file(&manifest)?;
+    }
+    let module = dunce::canonicalize(root.join(module))?;
+    if let Some(p) = model.maven.as_ref().and_then(|m| m.projects.iter().find(|p| root.join(&p.dir) == module)) {
+        let mut args = p.options.clone();
+        args.extend([
+            "process-resources".into(),
+            "help:evaluate".into(),
+            "-Dexpression=project.build.outputDirectory".into(),
+            format!("-Doutput={}", manifest.display()),
+        ]);
+        return Ok(ResourceBuild {
+            command: p.command.clone(),
+            args,
+            cwd: p.dir.clone(),
+            env: p.env.clone(),
+            kind: "maven",
+        });
+    }
+    if let Some(g) = &model.gradle
+        && let Some(p) = g.projects.iter().find(|p| root.join(&p.dir) == module)
+    {
+        let script = cache.join("resources.init.gradle");
+        fs::write(
+            &script,
+            format!(
+                r#"gradle.projectsEvaluated {{
+    def p = gradle.rootProject.project({})
+    def resources = p.tasks.named('processResources')
+    p.tasks.register('openideaUpdateResources') {{
+        dependsOn resources
+        doLast {{ new File({}).setText(resources.get().destinationDir.absolutePath, 'UTF-8') }}
+    }}
+}}
+"#,
+                literal(&p.path),
+                literal(&manifest.to_string_lossy())
+            ),
+        )?;
+        return Ok(ResourceBuild {
+            command: g.command.clone(),
+            args: vec![
+                "--init-script".into(),
+                script.to_string_lossy().into_owned(),
+                format!("{}:openideaUpdateResources", p.path.trim_end_matches(':')),
+            ],
+            cwd: g.dir.clone(),
+            env: g.env.clone(),
+            kind: "gradle",
+        });
+    }
+    Err(IdeError::invalid("The Spring Boot module must belong to a linked Maven or Gradle build"))
+}
+
+pub fn publish(root: &Path, cache: &Path, class_paths: &[String], main_class: &str) -> IdeResult<()> {
+    let output = PathBuf::from(fs::read_to_string(cache.join("resource-output.txt"))?.trim());
+    if !output.is_absolute() || !output.is_dir() {
+        return Err(IdeError::invalid("The resource build did not report an output directory"));
+    }
+    let output = dunce::canonicalize(output)?;
+    let paths: Vec<_> = class_paths.iter().filter_map(|p| dunce::canonicalize(root.join(p)).ok()).collect();
+    // A separate resource directory is already on the runtime classpath (e.g. build/resources/main).
+    if paths.contains(&output) {
+        return Ok(());
+    }
+    // jdtls uses bin/main for Gradle, rather than Gradle's build/resources/main.
+    let class_file = main_class.split('.').collect::<PathBuf>().with_extension("class");
+    let destination = paths.iter().find(|p| p.join(&class_file).is_file()).ok_or_else(|| {
+        IdeError::invalid("Cannot find the running main class output directory; restart the application")
+    })?;
+    let previous: Vec<String> = fs::read(cache.join("published-resources.json"))
+        .ok()
+        .and_then(|bytes| serde_json::from_slice(&bytes).ok())
+        .unwrap_or_default();
+    let mut current = Vec::new();
+    copy_resources(&output, &output, destination, &mut current)?;
+    for rel in previous.iter().filter(|p| !current.contains(p)) {
+        let path = destination.join(rel);
+        if path.is_file() {
+            fs::remove_file(path)?;
+        }
+    }
+    fs::write(
+        cache.join("published-resources.json"),
+        serde_json::to_vec(&current).map_err(|e| IdeError::internal(e.to_string()))?,
+    )?;
+    Ok(())
+}
+
+fn copy_resources(root: &Path, from: &Path, to: &Path, copied: &mut Vec<String>) -> IdeResult<()> {
+    for entry in fs::read_dir(from)? {
+        let entry = entry?;
+        let path = entry.path();
+        let kind = entry.file_type()?;
+        if kind.is_symlink() {
+            continue;
+        }
+        if kind.is_dir() {
+            copy_resources(root, &path, to, copied)?;
+        } else if kind.is_file() && path.extension().is_none_or(|e| e != "class") {
+            let rel = path.strip_prefix(root).map_err(|e| IdeError::internal(e.to_string()))?;
+            let dest = to.join(rel);
+            if let Some(parent) = dest.parent() {
+                fs::create_dir_all(parent)?;
+            }
+            fs::copy(&path, dest)?;
+            copied.push(rel.to_string_lossy().into_owned());
+        }
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn resource_plans_use_the_selected_module_and_build_configuration() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = dunce::canonicalize(tmp.path()).unwrap();
+        fs::create_dir(root.join("app")).unwrap();
+        let mut model = BuildModel {
+            maven: Some(crate::MavenModel {
+                projects: vec![crate::MavenProject {
+                    dir: "app".into(),
+                    command: "/tools/mvnw".into(),
+                    options: vec!["-Pdev".into()],
+                    env: BTreeMap::from([("JAVA_HOME".into(), "/jdk".into())]),
+                    ..Default::default()
+                }],
+                ..Default::default()
+            }),
+            ..Default::default()
+        };
+        let cache = root.join("cache");
+        let maven = plan(&root, &model, Path::new("app"), &cache).unwrap();
+        assert_eq!(maven.command, "/tools/mvnw");
+        assert_eq!(maven.cwd, "app");
+        assert_eq!(maven.args[0..2], ["-Pdev", "process-resources"]);
+        assert!(maven.args.contains(&"-Dexpression=project.build.outputDirectory".into()));
+        assert_eq!(maven.env["JAVA_HOME"], "/jdk");
+        model.maven = None;
+        model.gradle = Some(crate::GradleModel {
+            command: "/tools/gradlew".into(),
+            projects: vec![crate::GradleProject { path: ":app".into(), dir: "app".into(), ..Default::default() }],
+            ..Default::default()
+        });
+        let gradle = plan(&root, &model, Path::new("app"), &cache).unwrap();
+        assert_eq!(gradle.command, "/tools/gradlew");
+        assert_eq!(gradle.args.last().unwrap(), ":app:openideaUpdateResources");
+        let script = fs::read_to_string(cache.join("resources.init.gradle")).unwrap();
+        assert!(script.contains("processResources") && script.contains("destinationDir.absolutePath"));
+        assert!(!script.contains("build/resources/main")); // The task owns custom output locations.
+    }
+
+    #[test]
+    fn publishes_maven_and_gradle_resource_outputs_to_the_runtime_classpath() {
+        for layout in ["target/classes", "build/resources/main", "custom resource output"] {
+            let tmp = tempfile::tempdir().unwrap();
+            let root = tmp.path();
+            let cache = root.join("cache");
+            let output = root.join(layout);
+            let runtime = if layout == "target/classes" { output.clone() } else { root.join("bin/main") };
+            fs::create_dir_all(output.join("static")).unwrap();
+            fs::create_dir_all(runtime.join("example")).unwrap();
+            fs::create_dir_all(&cache).unwrap();
+            fs::write(cache.join("resource-output.txt"), output.to_string_lossy().as_bytes()).unwrap();
+            fs::write(output.join("static/index.html"), "after").unwrap();
+            fs::write(output.join("unrelated.class"), "do not publish").unwrap();
+            fs::write(runtime.join("example/Application.class"), "running").unwrap();
+            publish(root, &cache, &[runtime.to_string_lossy().into_owned()], "example.Application").unwrap();
+            assert_eq!(fs::read_to_string(runtime.join("static/index.html")).unwrap(), "after");
+            assert_eq!(fs::read_to_string(runtime.join("example/Application.class")).unwrap(), "running");
+            if output != runtime {
+                assert!(!runtime.join("unrelated.class").exists());
+                fs::remove_file(output.join("static/index.html")).unwrap();
+                publish(root, &cache, &[runtime.to_string_lossy().into_owned()], "example.Application").unwrap();
+                assert!(!runtime.join("static/index.html").exists());
+            }
+        }
+    }
+
+    #[test]
+    fn leaves_separate_runtime_resource_directories_in_place_and_rejects_jar_only_runs() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        let output = root.join("build/resources/main");
+        let cache = root.join("cache");
+        fs::create_dir_all(&output).unwrap();
+        fs::create_dir(&cache).unwrap();
+        fs::write(cache.join("resource-output.txt"), output.to_string_lossy().as_bytes()).unwrap();
+        publish(root, &cache, &[output.to_string_lossy().into_owned()], "a.Main").unwrap();
+        assert!(publish(root, &cache, &["app.jar".into()], "a.Main").is_err());
+    }
+}

crates/ide-build/src/compile/fingerprint.rs

@@ -0,0 +1,321 @@
+//! Metadata fingerprints for successful Maven launch builds.
+use super::*;
+use std::fs;
+use std::hash::{Hash, Hasher};
+use std::time::SystemTime;
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LaunchFingerprint {
+    version: u32,
+    parameters: String,
+    files: BTreeMap<PathBuf, Option<(u64, SystemTime)>>,
+}
+
+fn scan(
+    path: &Path,
+    files: &mut BTreeMap<PathBuf, Option<(u64, SystemTime)>>,
+    ancestors: &mut HashSet<PathBuf>,
+    cancel: &CancellationToken,
+) -> IdeResult<()> {
+    if cancel.is_cancelled() {
+        return Err(IdeError::cancelled());
+    }
+    let meta = match fs::metadata(path) {
+        Ok(meta) => meta,
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
+            files.insert(path.to_path_buf(), None);
+            return Ok(());
+        }
+        Err(e) => return Err(e.into()),
+    };
+    if meta.is_dir() {
+        let canonical = dunce::canonicalize(path)?;
+        if !ancestors.insert(canonical.clone()) {
+            return Err(IdeError::internal("cyclic launch input directory"));
+        }
+        // Directory mtimes change on irrelevant JDT writes. File paths detect additions/deletions.
+        files.insert(path.to_path_buf(), None);
+        for entry in fs::read_dir(path)? {
+            scan(&entry?.path(), files, ancestors, cancel)?;
+        }
+        ancestors.remove(&canonical);
+    } else if meta.is_file() {
+        files.insert(path.to_path_buf(), Some((meta.len(), meta.modified()?)));
+    } else {
+        return Err(IdeError::internal("unsupported launch input file"));
+    }
+    Ok(())
+}
+
+/// `None` means an input cannot be resolved safely: build normally without reuse.
+/// All filesystem work belongs on the caller's blocking thread.
+pub fn launch_fingerprint(
+    root: &Path,
+    model: &BuildModel,
+    module: &Path,
+    test: bool,
+    local_repo: Option<PathBuf>,
+    cancel: &CancellationToken,
+) -> IdeResult<Option<LaunchFingerprint>> {
+    let Some(m) = &model.maven else { return Ok(None) };
+    let projects = maven_launch_projects(root, m, module, test);
+    if projects.is_empty() {
+        return Ok(None);
+    }
+    let Some(mut inputs) = maven::launch_inputs(root, &projects, local_repo) else { return Ok(None) };
+    let plan = launch_plan(root, model, module, test)?;
+    let mut environment: BTreeMap<String, String> = std::env::vars()
+        .map(|(key, value)| (key.to_ascii_uppercase(), value))
+        .filter(|(key, _)| {
+            key.starts_with("MAVEN_")
+                || key.starts_with("JAVA_")
+                || key.starts_with("JDK_")
+                || matches!(
+                    key.as_str(),
+                    "PATH" | "HOME" | "LANG" | "LC_ALL" | "_JAVA_OPTIONS" | "M2_HOME" | "MAVEN_HOME"
+                )
+        })
+        .collect();
+    // Explicit step values override the inherited environment just as they do in Command.
+    for step in &plan.steps {
+        environment.extend(step.env.iter().map(|(key, value)| (key.to_ascii_uppercase(), value.clone())));
+        for dir in step.cwd.ancestors() {
+            inputs.extend([dir.join(".mvn"), dir.join("mvnw"), dir.join("mvnw.cmd")]);
+            if dir == root {
+                break;
+            }
+        }
+        let program = process::program_path(&step.program, &step.env);
+        inputs.push(program.clone());
+        // Maven installed via a symlink still reads conf from its distribution.
+        if let Ok(program) = dunce::canonicalize(program)
+            && let Some(home) = program.parent().and_then(Path::parent)
+        {
+            for conf in ["conf", "libexec/conf"] {
+                inputs.extend([home.join(conf).join("settings.xml"), home.join(conf).join("toolchains.xml")]);
+            }
+        }
+        if !environment.contains_key("JAVA_HOME") {
+            let java = process::program_path(if cfg!(windows) { "java.exe" } else { "java" }, &step.env);
+            inputs.push(java.clone());
+            if let Ok(java) = dunce::canonicalize(java)
+                && let Some(home) = java.parent().and_then(Path::parent)
+            {
+                inputs.push(home.join("release"));
+            }
+        }
+        for (i, arg) in step.args.iter().enumerate() {
+            if matches!(arg.as_str(), "-s" | "--settings" | "-gs" | "--global-settings" | "-t" | "--toolchains")
+                && let Some(file) = step.args.get(i + 1)
+            {
+                inputs.push(step.cwd.join(file));
+            }
+            for prefix in ["--settings=", "--global-settings=", "--toolchains="] {
+                if let Some(file) = arg.strip_prefix(prefix) {
+                    inputs.push(step.cwd.join(file));
+                }
+            }
+        }
+    }
+    if let Some(home) = dirs::home_dir() {
+        inputs.extend([home.join(".m2/settings.xml"), home.join(".m2/toolchains.xml")]);
+    }
+    for key in ["MAVEN_HOME", "M2_HOME"] {
+        if let Some(home) = environment.get(key) {
+            inputs.extend([Path::new(home).join("conf/settings.xml"), Path::new(home).join("conf/toolchains.xml")]);
+        }
+    }
+    if let Some(home) = environment.get("JAVA_HOME") {
+        inputs.extend([
+            Path::new(home).join("release"),
+            Path::new(home).join("lib/modules"),
+            Path::new(home).join("lib/tools.jar"),
+            Path::new(home).join(if cfg!(windows) { "bin/java.exe" } else { "bin/java" }),
+        ]);
+    }
+    let steps: Vec<_> =
+        plan.steps.iter().map(|s| (process::program_path(&s.program, &s.env), &s.args, &s.cwd, &s.env)).collect();
+    // Profiles and plugins can read arbitrary environment variables. Keep a signature
+    // of the inherited environment without persisting unrelated credentials.
+    let inherited: BTreeMap<_, _> = std::env::vars_os().collect();
+    let mut inherited_hash = std::hash::DefaultHasher::new();
+    inherited.hash(&mut inherited_hash);
+    let parameters =
+        serde_json::to_string(&(root, module, test, steps, environment, inherited_hash.finish(), projects))
+            .map_err(|e| IdeError::internal(e.to_string()))?;
+    let mut files = BTreeMap::new();
+    for path in inputs {
+        scan(&path, &mut files, &mut HashSet::new(), cancel)?;
+    }
+    // Store project inputs relative to the project, including each file's relative path.
+    let files = files.into_iter().map(|(p, stamp)| (p.strip_prefix(root).unwrap_or(&p).to_path_buf(), stamp)).collect();
+    Ok(Some(LaunchFingerprint { version: 1, parameters, files }))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn write(root: &Path, rel: &str, value: &str) {
+        let path = root.join(rel);
+        fs::create_dir_all(path.parent().unwrap()).unwrap();
+        fs::write(path, value).unwrap();
+    }
+
+    fn fixture(root: &Path) -> BuildModel {
+        write(
+            root,
+            "pom.xml",
+            r#"<project><groupId>demo</groupId><artifactId>parent</artifactId><version>1</version>
+            <packaging>pom</packaging><modules><module>lib</module><module>app</module></modules></project>"#,
+        );
+        write(
+            root,
+            "lib/pom.xml",
+            r#"<project><parent><groupId>demo</groupId><artifactId>parent</artifactId><version>1</version></parent>
+            <artifactId>lib</artifactId><build><sourceDirectory>code</sourceDirectory><resources><resource><directory>conf</directory></resource></resources></build></project>"#,
+        );
+        write(
+            root,
+            "app/pom.xml",
+            r#"<project><parent><groupId>demo</groupId><artifactId>parent</artifactId><version>1</version></parent>
+            <artifactId>app</artifactId><dependencies><dependency><groupId>demo</groupId><artifactId>lib</artifactId><version>1</version></dependency></dependencies></project>"#,
+        );
+        write(root, "lib/src/main/kotlin/Channel.kt", "value");
+        write(root, "app/src/main/resources/app.properties", "key=value");
+        write(root, "lib/conf/custom.properties", "custom=value");
+        write(root, "lib/code/Custom.java", "class Custom {}");
+        BuildModel { maven: Some(maven::load(root)), ..Default::default() }
+    }
+
+    fn fingerprint(root: &Path, model: &BuildModel) -> Option<LaunchFingerprint> {
+        launch_fingerprint(root, model, &root.join("app"), false, None, &CancellationToken::new()).unwrap()
+    }
+
+    #[test]
+    fn unchanged_inputs_match_but_source_resource_pom_add_delete_and_mtime_invalidate() {
+        for rel in [
+            "lib/src/main/kotlin/Channel.kt",
+            "app/src/main/resources/app.properties",
+            "lib/conf/custom.properties",
+            "lib/code/Custom.java",
+            "app/pom.xml",
+            "lib/pom.xml",
+            "pom.xml",
+            ".mvn/maven.config",
+            "lib/src/main/groovy/New.groovy",
+            "app/src/test/scala/Test.scala",
+        ] {
+            let dir = tempfile::tempdir().unwrap();
+            let root = dir.path();
+            let model = fixture(root);
+            let before = fingerprint(root, &model);
+            assert!(before.is_some());
+            assert_eq!(before, fingerprint(root, &model), "unchanged {rel}");
+            let serialized = serde_json::to_vec(&before).unwrap();
+            assert_eq!(before, serde_json::from_slice(&serialized).unwrap());
+            let value = if rel.ends_with("pom.xml") {
+                format!("{}<!-- changed -->", fs::read_to_string(root.join(rel)).unwrap())
+            } else {
+                "changed input".to_owned()
+            };
+            write(root, rel, &value);
+            let changed = fingerprint(root, &model);
+            assert_ne!(before, changed, "changed/added {rel}");
+            let file = fs::OpenOptions::new().write(true).open(root.join(rel)).unwrap();
+            file.set_modified(SystemTime::UNIX_EPOCH + std::time::Duration::from_secs(42)).unwrap();
+            let touched = fingerprint(root, &model);
+            assert_ne!(changed, touched, "mtime-only {rel}");
+            fs::remove_file(root.join(rel)).unwrap();
+            assert_ne!(touched, fingerprint(root, &model), "deleted {rel}");
+        }
+    }
+
+    #[test]
+    fn profile_options_jdk_goal_and_wrapper_invalidate_without_using_class_outputs() {
+        let dir = tempfile::tempdir().unwrap();
+        let root = dir.path();
+        let mut model = fixture(root);
+        let before = fingerprint(root, &model);
+        write(root, "lib/target/classes/Channel.class", "JDT stub");
+        write(root, "app/target/classes/Main.class", "JDT stub");
+        assert_eq!(before, fingerprint(root, &model));
+        let mut previous = before.clone();
+        for option in ["-Pdev", "-Pprod", "-DskipTests", "-o"] {
+            model.maven.as_mut().unwrap().projects[0].options = vec![option.into()];
+            let current = fingerprint(root, &model);
+            assert_ne!(previous, current, "{option}");
+            previous = current;
+        }
+        model.maven.as_mut().unwrap().projects[0].options.clear();
+        model.maven.as_mut().unwrap().projects[0]
+            .env
+            .insert("JAVA_HOME".into(), root.join("jdk").to_string_lossy().into_owned());
+        let jdk = fingerprint(root, &model);
+        assert_ne!(before, jdk);
+        write(root, "jdk/release", "JAVA_VERSION=21");
+        assert_ne!(jdk, fingerprint(root, &model));
+        model.maven.as_mut().unwrap().projects[0].env.clear();
+        let test = launch_fingerprint(root, &model, &root.join("app"), true, None, &CancellationToken::new())
+            .unwrap()
+            .unwrap();
+        assert_ne!(before, Some(test));
+        write(root, "mvnw", "wrapper changed");
+        assert_ne!(before, fingerprint(root, &model));
+    }
+
+    #[test]
+    fn unresolved_roots_and_cancel_never_claim_up_to_date() {
+        let dir = tempfile::tempdir().unwrap();
+        let root = dir.path();
+        let model = fixture(root);
+        write(
+            root,
+            "lib/pom.xml",
+            "<project><artifactId>lib</artifactId><build><sourceDirectory>${unknown}/src</sourceDirectory></build></project>",
+        );
+        assert!(
+            launch_fingerprint(root, &model, &root.join("app"), false, None, &CancellationToken::new())
+                .unwrap()
+                .is_none()
+        );
+        let model = fixture(root);
+        let cancel = CancellationToken::new();
+        cancel.cancel();
+        assert!(launch_fingerprint(root, &model, &root.join("app"), false, None, &cancel).is_err());
+    }
+    #[test]
+    fn external_parent_and_selected_settings_files_invalidate() {
+        let dir = tempfile::tempdir().unwrap();
+        let root = dir.path().join("project");
+        let repo = dir.path().join("repository");
+        write(
+            &repo,
+            "demo/parent/1/parent-1.pom",
+            "<project><groupId>demo</groupId><artifactId>parent</artifactId><version>1</version></project>",
+        );
+        write(
+            &root,
+            "pom.xml",
+            "<project><parent><groupId>demo</groupId><artifactId>parent</artifactId><version>1</version><relativePath/></parent><artifactId>app</artifactId></project>",
+        );
+        let mut model = crate::load(&root, &root.join("cache"), Some(repo.clone()));
+        let settings = dir.path().join("custom-settings.xml");
+        fs::write(&settings, "<settings/>").unwrap();
+        model.maven.as_mut().unwrap().projects[0].options = vec!["-s".into(), settings.to_string_lossy().into_owned()];
+        let get =
+            || launch_fingerprint(&root, &model, &root, false, Some(repo.clone()), &CancellationToken::new()).unwrap();
+        let before = get();
+        assert!(before.is_some());
+        write(
+            &repo,
+            "demo/parent/1/parent-1.pom",
+            "<project><groupId>demo</groupId><artifactId>parent</artifactId><version>1</version><!-- changed --></project>",
+        );
+        let parent = get();
+        assert_ne!(before, parent);
+        fs::write(settings, "<settings><activeProfiles><activeProfile>dev</activeProfile></activeProfiles></settings>")
+            .unwrap();
+        assert_ne!(parent, get());
+    }
+}

crates/ide-build/src/compile/mod.rs

@@ -3,8 +3,11 @@
 //! background with cancellation and parses the compiler output into messages
 //! for the Build tool window, the Problems view and the editor.
 
+mod fingerprint;
 mod parse;
 
+pub use fingerprint::{LaunchFingerprint, launch_fingerprint};
+
 use crate::process::{self, Stream};
 use crate::{BuildModel, maven};
 use ide_core::{CancellationToken, Diagnostic, IdeError, IdeResult, Pos, Range, Severity};
@@ -225,6 +228,7 @@ fn maven_steps(root: &Path, model: &BuildModel, kind: BuildKind, module: Option<
     }
     let step = |p: &maven::MavenProject, extra: &[String]| {
         let mut s = BuildStep::new(&p.command, &["-B", "-Dstyle.color=never"], &subdir(root, &p.dir), Format::Maven);
+        s.args.extend(p.options.iter().cloned());
         s.args.extend(extra.iter().cloned());
         s.args.extend(goals.iter().map(|g| (*g).to_owned()));
         s.env = p.env.clone();
@@ -233,12 +237,10 @@ fn maven_steps(root: &Path, model: &BuildModel, kind: BuildKind, module: Option<
     let Some(module) = module else { return Ok(tops.iter().map(|p| step(p, &[])).collect()) };
     // The reactor root containing the module builds it with what it depends on (`-pl … -am`).
     let rel = rel_str(root, module);
-    let top = tops
-        .iter()
-        .filter(|t| t.dir.is_empty() || rel == t.dir || rel.starts_with(&format!("{}/", t.dir)))
-        .max_by_key(|t| t.dir.len())
-        .copied()
-        .unwrap_or(tops[0]);
+    if !m.projects.iter().any(|p| p.dir == rel) {
+        return Err(IdeError::not_found("no linked Maven project found for module"));
+    }
+    let top = maven_reactor(m, &rel).ok_or_else(|| IdeError::not_found("no linked Maven project found for module"))?;
     let top_dir = subdir(root, &top.dir);
     if module == top_dir {
         return Ok(vec![step(top, &[])]);
@@ -583,6 +585,7 @@ pub fn diagnostics(messages: &[BuildMessage]) -> BTreeMap<PathBuf, Vec<Diagnosti
             code: m.code.clone(),
             unnecessary: false,
             deprecated: false,
+            server: Some(DIAGNOSTICS_SOURCE.to_owned()),
         });
     }
     out
@@ -606,6 +609,90 @@ pub fn has_non_java_sources(module: &Path) -> bool {
     walk(&module.join("src"), 12)
 }
 
+fn reactor_projects<'a>(m: &'a maven::MavenModel, top: &'a maven::MavenProject) -> Vec<&'a maven::MavenProject> {
+    let mut projects = Vec::new();
+    let mut pending = vec![top];
+    let mut seen = HashSet::new();
+    while let Some(p) = pending.pop() {
+        if !seen.insert(&p.pom) {
+            continue;
+        }
+        projects.push(p);
+        pending.extend(m.projects.iter().filter(|child| p.modules.contains(&child.pom)));
+    }
+    projects
+}
+
+fn maven_reactor<'a>(m: &'a maven::MavenModel, module: &str) -> Option<&'a maven::MavenProject> {
+    m.projects.iter().filter(|p| !p.aggregated).find(|top| reactor_projects(m, top).iter().any(|p| p.dir == module))
+}
+
+/// Launch module first, followed by its upstream modules in the same Maven reactor.
+/// External artifacts and unrelated linked reactors are never rebuilt for this launch.
+fn maven_launch_projects<'a>(
+    root: &Path,
+    m: &'a maven::MavenModel,
+    module: &Path,
+    test: bool,
+) -> Vec<&'a maven::MavenProject> {
+    let rel = rel_str(root, module);
+    let Some(top) = maven_reactor(m, &rel) else { return Vec::new() };
+    let reactor = reactor_projects(m, top);
+    let Some(start) = reactor.iter().find(|p| p.dir == rel) else { return Vec::new() };
+    let mut pending = vec![*start];
+    let mut seen = HashSet::new();
+    let mut projects = Vec::new();
+    while let Some(p) = pending.pop() {
+        if !seen.insert(&p.pom) {
+            continue;
+        }
+        projects.push(p);
+        for dep in &p.dependencies {
+            if !dep.resolved() || (dep.scope == "test" && (!test || p.pom != start.pom)) {
+                continue;
+            }
+            if let Some(upstream) = reactor.iter().find(|u| {
+                u.group_id == dep.group_id
+                    && u.artifact_id == dep.artifact_id
+                    && dep.version.as_ref().is_none_or(|v| *v == u.version)
+            }) {
+                pending.push(*upstream);
+            }
+        }
+    }
+    projects
+}
+
+/// Whether a launch requires the external JVM compiler. Maven includes upstream
+/// reactor dependencies; adapter selection remains a separate, module-local decision.
+pub fn launch_has_non_java_sources(root: &Path, model: &BuildModel, module: &Path, test: bool) -> bool {
+    if let Some(m) = &model.maven {
+        let projects = maven_launch_projects(root, m, module, test);
+        if !projects.is_empty() {
+            return projects.iter().any(|p| has_non_java_sources(&subdir(root, &p.dir)));
+        }
+    }
+    has_non_java_sources(module)
+}
+
+fn launch_plan(root: &Path, model: &BuildModel, module: &Path, test: bool) -> IdeResult<BuildPlan> {
+    let kind = if model.maven.as_ref().is_some_and(|m| m.projects.iter().any(|p| subdir(root, &p.dir) == module)) {
+        // JDT may have left newer error stubs in Maven's output directories.
+        BuildKind::Rebuild
+    } else {
+        BuildKind::Build
+    };
+    let mut plan = plan(root, model, kind, Some(module))?;
+    if plan.system == BuildSystem::Maven && !test {
+        for step in &mut plan.steps {
+            if let Some(goal) = step.args.last_mut() {
+                *goal = "compile".into();
+            }
+        }
+    }
+    Ok(plan)
+}
+
 /// Compiles the module at `module` with its build system before a JVM launch and
 /// returns the class directories it wrote, to put ahead of the jdtls classpath.
 pub fn build_for_launch(
@@ -615,7 +702,7 @@ pub fn build_for_launch(
     test: bool,
     cancel: &CancellationToken,
 ) -> IdeResult<Vec<PathBuf>> {
-    let plan = plan(root, model, BuildKind::Build, Some(module))?;
+    let plan = launch_plan(root, model, module, test)?;
     let result = run(root, &plan, cancel, &|_| {})?;
     if !result.success {
         let errors: Vec<String> = result
@@ -630,6 +717,14 @@ pub fn build_for_launch(
             .collect();
         return Err(IdeError::internal(format!("Build failed:\n{}", errors.join("\n"))));
     }
+    if plan.system == BuildSystem::Maven
+        && let Some(m) = &model.maven
+    {
+        return Ok(maven_launch_projects(root, m, module, test)
+            .iter()
+            .flat_map(|p| launch_class_dirs(plan.system, &subdir(root, &p.dir), test && subdir(root, &p.dir) == module))
+            .collect());
+    }
     Ok(launch_class_dirs(plan.system, module, test))
 }
 
@@ -671,7 +766,7 @@ mod tests {
         );
         write(&root, "core/pom.xml", "<project><artifactId>core</artifactId></project>");
         write(&root, "core/src/main/java/A.java", "class A {}");
-        let model = crate::load(&root, &tmp.path().join("cache"));
+        let model = crate::load(&root, &tmp.path().join("cache"), None);
         let p = plan(&root, &model, BuildKind::Build, None).unwrap();
         assert_eq!(p.system, BuildSystem::Maven);
         assert_eq!(p.title, "demo");
@@ -685,7 +780,7 @@ mod tests {
         let g = tmp.path().join("g");
         write(&g, "settings.gradle", "include 'app'");
         write(&g, "app/build.gradle", "apply plugin: 'java'");
-        let model = crate::load(&g, &tmp.path().join("cache2"));
+        let model = crate::load(&g, &tmp.path().join("cache2"), None);
         let p = plan(&g, &model, BuildKind::Build, Some(&g.join("app/src/A.java"))).unwrap();
         assert_eq!(p.system, BuildSystem::Gradle);
         assert_eq!(p.steps[0].args, ["--console=plain", ":app:classes", ":app:testClasses"]);
@@ -816,6 +911,142 @@ mod tests {
         }
     }
 
+    fn reactor_model() -> BuildModel {
+        let project = |dir: &str, deps: &[&str]| maven::MavenProject {
+            pom: format!("{dir}/pom.xml"),
+            dir: dir.into(),
+            group_id: "probe".into(),
+            artifact_id: dir.into(),
+            version: "1".into(),
+            aggregated: true,
+            dependencies: deps
+                .iter()
+                .map(|d| maven::MavenDependency {
+                    group_id: "probe".into(),
+                    artifact_id: (*d).into(),
+                    version: Some("1".into()),
+                    scope: "compile".into(),
+                    ..Default::default()
+                })
+                .collect(),
+            ..Default::default()
+        };
+        let mut projects = vec![
+            project("app", &["middle"]),
+            project("middle", &["lib"]),
+            project("lib", &["app"]),
+            project("unrelated", &[]),
+        ];
+        projects.insert(
+            0,
+            maven::MavenProject {
+                pom: "pom.xml".into(),
+                artifact_id: "reactor".into(),
+                command: "mvnw".into(),
+                modules: projects.iter().map(|p| p.pom.clone()).collect(),
+                options: vec!["-s".into(), "settings.xml".into()],
+                env: BTreeMap::from([("JAVA_HOME".into(), "/jdk".into())]),
+                ..Default::default()
+            },
+        );
+        BuildModel { maven: Some(maven::MavenModel { projects, ..Default::default() }), ..Default::default() }
+    }
+
+    #[test]
+    fn mixed_launch_detection_follows_only_reactor_dependencies() {
+        for extension in ["kt", "groovy", "scala"] {
+            let tmp = tempfile::tempdir().unwrap();
+            let root = tmp.path();
+            let mut model = reactor_model();
+            write(root, "app/src/main/java/Application.java", "class Application {}");
+            write(root, &format!("unrelated/src/main/java/Other.{extension}"), "");
+            assert!(!launch_has_non_java_sources(root, &model, &root.join("app"), false));
+            write(root, &format!("lib/src/main/java/Channel.{extension}"), "");
+            assert!(launch_has_non_java_sources(root, &model, &root.join("app"), false));
+            assert_eq!(
+                maven_launch_projects(root, model.maven.as_ref().unwrap(), &root.join("app"), false).len(),
+                3,
+                "cycles terminate"
+            );
+            let m = model.maven.as_mut().unwrap();
+            m.projects[2].dependencies[0].scope = "test".into();
+            assert!(
+                !launch_has_non_java_sources(root, &model, &root.join("app"), true),
+                "upstream test dependencies are not transitive"
+            );
+            let m = model.maven.as_mut().unwrap();
+            m.projects[1].dependencies[0].scope = "test".into();
+            m.projects[2].dependencies[0].scope = "compile".into();
+            assert!(!launch_has_non_java_sources(root, &model, &root.join("app"), false));
+            assert!(launch_has_non_java_sources(root, &model, &root.join("app"), true));
+            model.maven.as_mut().unwrap().projects[2].dependencies[0].version = Some("external".into());
+            assert!(!launch_has_non_java_sources(root, &model, &root.join("app"), true));
+            model.maven.as_mut().unwrap().projects[2].dependencies[0].version = Some("1".into());
+            model.maven.as_mut().unwrap().projects[3].aggregated = false;
+            model.maven.as_mut().unwrap().projects[0].modules.retain(|p| p != "lib/pom.xml");
+            assert!(
+                !launch_has_non_java_sources(root, &model, &root.join("app"), true),
+                "another linked reactor is external"
+            );
+        }
+    }
+
+    #[test]
+    fn maven_launch_steps_use_reactor_settings_and_launch_scope() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        write(root, "app/pom.xml", "<project/>");
+        let model = reactor_model();
+        for (test, goal) in [(false, "compile"), (true, "test-compile")] {
+            let plan = launch_plan(root, &model, &root.join("app"), test).unwrap();
+            let step = &plan.steps[0];
+            assert_eq!(step.cwd, root);
+            assert_eq!(step.program, "mvnw");
+            assert_eq!(step.env["JAVA_HOME"], "/jdk");
+            assert_eq!(
+                step.args,
+                ["-B", "-Dstyle.color=never", "-s", "settings.xml", "-pl", "app", "-am", "clean", goal]
+            );
+        }
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn external_launch_returns_upstream_outputs_and_blocks_failure_or_cancellation() {
+        use std::os::unix::fs::PermissionsExt;
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        write(root, "app/pom.xml", "<project/>");
+        write(
+            root,
+            "mvnw",
+            "#!/bin/sh\nmkdir -p app/target/classes middle/target/classes lib/target/classes app/target/test-classes\n",
+        );
+        let wrapper = root.join("mvnw");
+        std::fs::set_permissions(&wrapper, std::fs::Permissions::from_mode(0o755)).unwrap();
+        let mut model = reactor_model();
+        model.maven.as_mut().unwrap().projects[0].command = wrapper.to_string_lossy().into_owned();
+        let dirs = build_for_launch(root, &model, &root.join("app"), true, &CancellationToken::new()).unwrap();
+        assert_eq!(
+            dirs,
+            ["app/target/test-classes", "app/target/classes", "middle/target/classes", "lib/target/classes"]
+                .map(|p| root.join(p))
+        );
+        write(
+            root,
+            "mvnw",
+            "#!/bin/sh\necho '[ERROR] Kotlin compilation failed: unresolved reference broken' >&2\nexit 1\n",
+        );
+        let error = build_for_launch(root, &model, &root.join("app"), false, &CancellationToken::new()).unwrap_err();
+        assert!(error.message.contains("Kotlin compilation failed"), "{}", error.message);
+        let cancel = CancellationToken::new();
+        cancel.cancel();
+        assert_eq!(
+            build_for_launch(root, &model, &root.join("app"), false, &cancel).unwrap_err().kind,
+            ide_core::error::ErrorKind::Cancelled
+        );
+    }
+
     #[test]
     fn non_java_launch_class_dirs() {
         let tmp = tempfile::tempdir().unwrap();

crates/ide-build/src/gradle.rs

@@ -285,6 +285,74 @@ pub fn script_java_version(text: &str) -> Option<u32> {
     None
 }
 
+/// Configurations whose dependencies are libraries (`testFixturesImplementation` ends in one).
+const DEPENDENCY_CONFIGURATIONS: &[&str] = &[
+    "implementation",
+    "api",
+    "compileOnly",
+    "runtimeOnly",
+    "compileOnlyApi",
+    "annotationProcessor",
+    "kapt",
+    "ksp",
+    "compile",
+    "runtime",
+    "testCompile",
+    "testRuntime",
+    "developmentOnly",
+];
+
+fn is_dependency_configuration(name: &str) -> bool {
+    DEPENDENCY_CONFIGURATIONS.iter().any(|c| {
+        name == *c || {
+            let mut cap = c.chars();
+            let first = cap.next().map(|f| f.to_ascii_uppercase()).into_iter();
+            let capitalised: String = first.chain(cap).collect();
+            name.len() > c.len() && name.ends_with(&capitalised)
+        }
+    })
+}
+
+/// `(group, artifact, version)` of the external dependencies a build script declares:
+/// `implementation 'g:a:v'`, `api("g:a:v:classifier@jar")`, and the map notation
+/// `implementation group: 'g', name: 'a', version: 'v'` (Groovy) / `group = "g", …` (Kotlin).
+/// Versions with interpolations, ranges and catalog aliases (`libs.x`) are skipped.
+pub fn script_dependencies(text: &str) -> Vec<(String, String, String)> {
+    let text = strip_comments(text);
+    let mut out = Vec::new();
+    for line in text.lines().flat_map(|l| l.split(['{', ';'])) {
+        let line = line.trim_start();
+        let name: String = line.chars().take_while(|c| c.is_ascii_alphanumeric() || *c == '_').collect();
+        if name.is_empty() || !is_dependency_configuration(&name) {
+            continue;
+        }
+        let rest = &line[name.len()..];
+        let lits = literals(rest);
+        let map_value = |key: &str| -> Option<String> {
+            let i = rest.find(key)?;
+            let after = rest[i + key.len()..].trim_start().strip_prefix([':', '='])?;
+            literals(after).into_iter().next()
+        };
+        let coordinate = match (map_value("group"), map_value("name"), map_value("version")) {
+            (Some(g), Some(a), Some(v)) => Some((g, a, v)),
+            _ => lits.first().and_then(|l| {
+                let l = l.split('@').next().unwrap_or(l);
+                let mut parts = l.split(':');
+                Some((parts.next()?.to_owned(), parts.next()?.to_owned(), parts.next()?.to_owned()))
+            }),
+        };
+        if let Some((g, a, v)) = coordinate {
+            let plain = |s: &str| {
+                !s.is_empty() && s.chars().all(|c| c.is_ascii_alphanumeric() || matches!(c, '.' | '-' | '_' | '+'))
+            };
+            if plain(&g) && plain(&a) && plain(&v) && !v.contains('+') {
+                out.push((g, a, v));
+            }
+        }
+    }
+    out
+}
+
 /// Every settings and build script of the model (for change detection).
 pub fn build_files(root: &Path, model: &GradleModel) -> Vec<PathBuf> {
     let dir = root.join(&model.dir);
@@ -331,8 +399,46 @@ pub fn parse_tasks(output: &str) -> Vec<(String, GradleTask)> {
     out
 }
 
+/// Static fallback until Gradle has reported its tasks.
+pub(crate) fn has_war_plugin(script: &str) -> bool {
+    let script = strip_comments(script);
+    script.split(|c: char| !c.is_alphanumeric() && c != '_').any(|word| word == "war")
+}
+
 #[cfg(test)]
 mod tests {
+    #[test]
+    fn script_dependencies_read_string_and_map_notations() {
+        let script = r#"
+plugins { id 'java' }
+dependencies {
+    implementation 'com.google.guava:guava:33.0.0-jre'
+    api("org.slf4j:slf4j-api:2.0.9")
+    testImplementation "junit:junit:4.13.2@jar"
+    // implementation 'commented:out:1.0'
+    compileOnly group: 'org.projectlombok', name: 'lombok', version: '1.18.30'
+    runtimeOnly(group = "com.h2database", name = "h2", version = "2.2.224")
+    implementation "org.x:dyn:${ver}"
+    implementation 'org.x:range:1.+'
+    implementation libs.okhttp
+    implementation project(':core')
+    classpath 'not:a:library'
+}
+"#;
+        let deps = script_dependencies(script);
+        let names: Vec<String> = deps.iter().map(|(g, a, v)| format!("{g}:{a}:{v}")).collect();
+        assert_eq!(
+            names,
+            [
+                "com.google.guava:guava:33.0.0-jre",
+                "org.slf4j:slf4j-api:2.0.9",
+                "junit:junit:4.13.2",
+                "org.projectlombok:lombok:1.18.30",
+                "com.h2database:h2:2.2.224",
+            ]
+        );
+    }
+
     use super::*;
 
     #[test]

crates/ide-build/src/kotlin_bridge.rs

@@ -0,0 +1,475 @@
+//! Private Maven builds for JDT's Kotlin binary libraries. Never use launch outputs.
+
+use crate::BuildModel;
+use crate::compile::{self, BuildEvent, BuildKind, BuildMessage};
+use ide_core::{CancellationToken, IdeError, IdeResult};
+use serde::{Deserialize, Serialize};
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct Module {
+    key: String,
+    project_uri: String,
+    output: PathBuf,
+    test_output: Option<PathBuf>,
+    dependencies: Vec<Dependency>,
+    has_kotlin: bool,
+    kotlin_goals: Vec<KotlinGoal>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+struct KotlinGoal {
+    execution: String,
+    status: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+struct Dependency {
+    key: String,
+    scope: String,
+    #[serde(rename = "type")]
+    kind: Option<String>,
+    classifier: Option<String>,
+}
+
+#[derive(Clone, Debug, Serialize, PartialEq, Eq)]
+pub struct Library {
+    pub path: PathBuf,
+    pub test: bool,
+}
+
+#[derive(Clone, Debug, Serialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct ProjectLibraries {
+    pub project_uri: String,
+    pub libraries: Vec<Library>,
+}
+
+pub struct Outcome {
+    pub projects: Vec<ProjectLibraries>,
+    pub messages: Vec<BuildMessage>,
+    pub success: bool,
+}
+
+/// Inspect sources, excluding generated/build/VCS trees and never following symlinks.
+pub fn has_kotlin(root: &Path) -> bool {
+    let Ok(entries) = std::fs::read_dir(root) else { return false };
+    entries.flatten().any(|entry| {
+        let Ok(kind) = entry.file_type() else { return false };
+        if kind.is_file() {
+            entry.path().extension().is_some_and(|e| e == "kt")
+        } else {
+            kind.is_dir()
+                && !matches!(
+                    entry.file_name().to_str(),
+                    Some("target" | "build" | "out" | "bin" | "node_modules" | ".git" | ".openidea")
+                )
+                && has_kotlin(&entry.path())
+        }
+    })
+}
+
+/// Run the project's configured wrapper/settings/JDK and lifecycle, with an output
+/// redirector loaded before Maven calculates its lifecycle execution plans.
+pub fn build(
+    root: &Path,
+    model: &BuildModel,
+    bundle: &Path,
+    generation: &Path,
+    cancel: &CancellationToken,
+) -> IdeResult<Outcome> {
+    std::fs::create_dir_all(generation)?;
+    let mut plan = compile::plan(root, model, BuildKind::Build, None)?;
+    if plan.system != compile::BuildSystem::Maven {
+        return Err(IdeError::invalid("Kotlin bridge requires a Maven build root"));
+    }
+    let mut manifests = Vec::new();
+    for (index, step) in plan.steps.iter_mut().enumerate() {
+        step.args.push("--fail-at-end".into());
+        let directory = generation.join(format!("reactor-{index}"));
+        std::fs::create_dir_all(&directory)?;
+        manifests.push(directory.join("modules.json"));
+        let mut extensions = vec![bundle.to_path_buf()];
+        step.args.retain(|arg| {
+            if let Some(value) = arg.strip_prefix("-Dmaven.ext.class.path=") {
+                extensions.extend(std::env::split_paths(value));
+                false
+            } else {
+                true
+            }
+        });
+        let extension_path = std::env::join_paths(extensions).map_err(|e| IdeError::invalid(e.to_string()))?;
+        step.args.push(format!("-Dmaven.ext.class.path={}", extension_path.to_string_lossy()));
+        step.args.push(format!("-Dopenidea.kotlin.staging={}", directory.join("staging").display()));
+    }
+    let mut messages = Vec::new();
+    // Independent linked reactors must still run after another reactor's javac fails.
+    for step in &plan.steps {
+        let mut reactor = plan.clone();
+        reactor.steps = vec![step.clone()];
+        let result = compile::run(root, &reactor, cancel, &|event| {
+            if let BuildEvent::Output { text, .. } = event {
+                tracing::debug!("kotlin bridge: {}", text.trim_end());
+            }
+        })?;
+        messages.extend(result.messages);
+    }
+    // javac diagnostics belong to JDT, including when a Kotlin target was skipped.
+    messages.retain(|message| {
+        message.path.as_ref().is_some_and(|path| PathBuf::from(path.clone()).extension().is_some_and(|e| e == "kt"))
+    });
+    let mut modules = Vec::new();
+    for manifest in manifests {
+        let parsed: Vec<Module> = serde_json::from_slice(&std::fs::read(manifest)?)
+            .map_err(|e| IdeError::internal(format!("Kotlin module manifest: {e}")))?;
+        modules.extend(parsed);
+    }
+    messages.extend(kotlin_failures(&modules));
+    if messages.iter().any(|message| message.severity == ide_core::Severity::Error) {
+        return Ok(Outcome { projects: Vec::new(), messages, success: false });
+    }
+    let pending = generation.join("libraries.pending");
+    let published = generation.join("libraries");
+    std::fs::create_dir_all(&pending)?;
+    let mut libraries = BTreeMap::new();
+    for (index, module) in modules.iter().enumerate() {
+        let mut outputs = ModuleLibraries::default();
+        for (source, target, name) in [
+            (Some(&module.output), &mut outputs.main, format!("main-{index}")),
+            (module.test_output.as_ref(), &mut outputs.test, format!("test-{index}")),
+        ] {
+            let Some(source) = source else { continue };
+            if !source.starts_with(generation) {
+                return Err(IdeError::internal("Kotlin build output escaped staging"));
+            }
+            if copy_kotlin(source, &pending.join(&name), cancel)? {
+                *target = Some(published.join(name));
+            }
+        }
+        libraries.insert(module.key.clone(), outputs);
+    }
+    publish(&pending, &published, cancel)?;
+    Ok(Outcome { projects: consumers(&modules, &libraries), messages, success: true })
+}
+
+fn kotlin_failures(modules: &[Module]) -> Vec<BuildMessage> {
+    let mut messages = Vec::new();
+    for module in modules {
+        if !module.has_kotlin {
+            continue;
+        }
+        if module.kotlin_goals.is_empty() {
+            messages.push(kotlin_failure(module, "compile target was not executed"));
+        }
+        for goal in &module.kotlin_goals {
+            if goal.status != "success" {
+                messages.push(kotlin_failure(module, &format!("{} {}", goal.execution, goal.status)));
+            }
+        }
+    }
+    messages
+}
+
+fn kotlin_failure(module: &Module, reason: &str) -> BuildMessage {
+    BuildMessage {
+        severity: ide_core::Severity::Error,
+        text: format!("Kotlin compilation for {}: {reason}", module.key),
+        path: None,
+        range: None,
+        code: None,
+    }
+}
+
+fn publish(pending: &Path, published: &Path, cancel: &CancellationToken) -> IdeResult<()> {
+    if cancel.is_cancelled() {
+        return Err(IdeError::cancelled());
+    }
+    std::fs::rename(pending, published)?;
+    Ok(())
+}
+
+#[derive(Default)]
+struct ModuleLibraries {
+    main: Option<PathBuf>,
+    test: Option<PathBuf>,
+}
+
+fn consumers(modules: &[Module], libraries: &BTreeMap<String, ModuleLibraries>) -> Vec<ProjectLibraries> {
+    modules
+        .iter()
+        .map(|consumer| {
+            let mut visible = Vec::<Library>::new();
+            let mut add = |path: &Option<PathBuf>, test: bool| {
+                if let Some(path) = path {
+                    if let Some(previous) = visible.iter_mut().find(|entry| &entry.path == path) {
+                        previous.test &= test;
+                    } else {
+                        visible.push(Library { path: path.clone(), test });
+                    }
+                }
+            };
+            if let Some(own) = libraries.get(&consumer.key) {
+                add(&own.test, true);
+                add(&own.main, false);
+            }
+            // Maven's resolved artifacts already apply exclusions, mediation and optional
+            // propagation. Preserve their classpath order, after the module's own output.
+            for dependency in &consumer.dependencies {
+                let Some(output) = libraries.get(&dependency.key) else { continue };
+                let test = match dependency.scope.as_str() {
+                    "compile" | "provided" | "system" | "" => false,
+                    "test" | "runtime" => true,
+                    _ => continue,
+                };
+                match (dependency.kind.as_deref(), dependency.classifier.as_deref()) {
+                    (Some("test-jar"), None | Some("tests")) | (Some("jar"), Some("tests")) => add(&output.test, test),
+                    (None | Some("jar"), None | Some("")) => add(&output.main, test),
+                    _ => {}
+                }
+            }
+            ProjectLibraries { project_uri: consumer.project_uri.clone(), libraries: visible }
+        })
+        .collect()
+}
+
+fn copy_kotlin(source: &Path, destination: &Path, cancel: &CancellationToken) -> IdeResult<bool> {
+    let Ok(entries) = std::fs::read_dir(source) else { return Ok(false) };
+    let mut found = false;
+    for entry in entries {
+        if cancel.is_cancelled() {
+            return Err(IdeError::cancelled());
+        }
+        let entry = entry?;
+        let kind = entry.file_type()?;
+        let path = entry.path();
+        let output = destination.join(entry.file_name());
+        if kind.is_dir() {
+            found |= copy_kotlin(&path, &output, cancel)?;
+        } else if kind.is_file() {
+            let bytes = std::fs::read(&path)?;
+            let class = path.extension().is_some_and(|e| e == "class");
+            let metadata = path.extension().is_some_and(|e| e == "kotlin_module");
+            if metadata || (class && kotlin_class(&bytes).unwrap_or(false)) {
+                std::fs::create_dir_all(destination)?;
+                std::fs::write(output, bytes)?;
+                found |= class;
+            }
+        }
+    }
+    Ok(found)
+}
+
+/// Read the actual class-level SourceFile attribute, rather than searching strings
+/// (a Java constant containing "Something.kt" must never become a Kotlin library).
+fn kotlin_class(bytes: &[u8]) -> Option<bool> {
+    struct Reader<'a> {
+        bytes: &'a [u8],
+        pos: usize,
+    }
+    impl<'a> Reader<'a> {
+        fn take(&mut self, count: usize) -> Option<&'a [u8]> {
+            let value = self.bytes.get(self.pos..self.pos.checked_add(count)?)?;
+            self.pos += count;
+            Some(value)
+        }
+        fn u2(&mut self) -> Option<usize> {
+            Some(u16::from_be_bytes(self.take(2)?.try_into().ok()?) as usize)
+        }
+        fn u4(&mut self) -> Option<usize> {
+            Some(u32::from_be_bytes(self.take(4)?.try_into().ok()?) as usize)
+        }
+        fn attributes(&mut self) -> Option<()> {
+            for _ in 0..self.u2()? {
+                self.u2()?;
+                let n = self.u4()?;
+                self.take(n)?;
+            }
+            Some(())
+        }
+    }
+    let mut reader = Reader { bytes, pos: 0 };
+    if reader.take(4)? != [0xca, 0xfe, 0xba, 0xbe] {
+        return None;
+    }
+    reader.take(4)?;
+    let count = reader.u2()?;
+    let mut utf8 = BTreeMap::new();
+    let mut index = 1;
+    while index < count {
+        match reader.take(1)?[0] {
+            1 => {
+                let n = reader.u2()?;
+                utf8.insert(index, reader.take(n)?);
+            }
+            3 | 4 | 9..=12 | 17 | 18 => {
+                reader.take(4)?;
+            }
+            5 | 6 => {
+                reader.take(8)?;
+                index += 1;
+            }
+            7 | 8 | 16 | 19 | 20 => {
+                reader.take(2)?;
+            }
+            15 => {
+                reader.take(3)?;
+            }
+            _ => return None,
+        }
+        index += 1;
+    }
+    reader.take(6)?;
+    let interfaces = reader.u2()?;
+    reader.take(interfaces.checked_mul(2)?)?;
+    for _ in 0..2 {
+        for _ in 0..reader.u2()? {
+            reader.take(6)?;
+            reader.attributes()?;
+        }
+    }
+    for _ in 0..reader.u2()? {
+        let name = reader.u2()?;
+        let length = reader.u4()?;
+        if utf8.get(&name).copied() == Some(b"SourceFile".as_slice()) && length == 2 {
+            let source = reader.u2()?;
+            return Some(utf8.get(&source)?.ends_with(b".kt"));
+        }
+        reader.take(length)?;
+    }
+    Some(false)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn every_kotlin_target_must_succeed_even_when_maven_fails_elsewhere() {
+        let mut modules: Vec<Module> = serde_json::from_str(r#"[
+            {"key":"lib","projectUri":"lib","output":"lib","dependencies":[],"hasKotlin":true,
+             "kotlinGoals":[{"execution":"main:compile","status":"success"},{"execution":"test:test-compile","status":"success"}]},
+            {"key":"java","projectUri":"java","output":"java","dependencies":[],"hasKotlin":false,"kotlinGoals":[]}
+        ]"#).unwrap();
+        assert!(kotlin_failures(&modules).is_empty());
+        for status in ["failed", "skipped"] {
+            modules[0].kotlin_goals[1].status = status.into();
+            let failures = kotlin_failures(&modules);
+            assert_eq!(failures.len(), 1);
+            assert!(failures[0].text.contains(&format!("test:test-compile {status}")));
+        }
+        modules[0].kotlin_goals.clear();
+        assert_eq!(kotlin_failures(&modules).len(), 1);
+        modules[0].has_kotlin = false;
+        assert!(kotlin_failures(&modules).is_empty());
+        assert!(
+            serde_json::from_str::<Vec<Module>>(
+                r#"[{"key":"old","projectUri":"old","output":"old","dependencies":[]}]"#
+            )
+            .is_err()
+        );
+    }
+
+    #[test]
+    fn respects_mavens_resolved_closure_and_scopes() {
+        let json = r#"[
+          {"key":"zapp","projectUri":"app","output":"app", "hasKotlin":false,"kotlinGoals":[],"dependencies":[{"key":"mid","scope":"compile","optional":false},{"key":"lib","scope":"compile","optional":false}]},
+          {"key":"mid","projectUri":"mid","output":"mid", "hasKotlin":false,"kotlinGoals":[],"dependencies":[
+            {"key":"lib","scope":"compile","optional":false},
+            {"key":"optional","scope":"compile","optional":true},
+            {"key":"test","scope":"test","optional":false},
+            {"key":"provided","scope":"provided","optional":false}]},
+          {"key":"lib","projectUri":"lib","output":"lib","hasKotlin":false,"kotlinGoals":[],"dependencies":[]}
+        ]"#;
+        let modules: Vec<Module> = serde_json::from_str(json).unwrap();
+        let libraries = ["zapp", "lib", "optional", "test", "provided"]
+            .into_iter()
+            .map(|key| (key.to_owned(), ModuleLibraries { main: Some(PathBuf::from(key)), test: None }))
+            .collect();
+        let result = consumers(&modules, &libraries);
+        assert_eq!(
+            result[0].libraries,
+            vec![Library { path: "zapp".into(), test: false }, Library { path: "lib".into(), test: false },]
+        );
+        assert_eq!(result[1].libraries.len(), 4);
+        assert!(result[1].libraries.iter().find(|l| l.path == Path::new("test")).unwrap().test);
+    }
+
+    #[test]
+    fn test_outputs_are_private_unless_maven_resolves_a_test_jar() {
+        let modules: Vec<Module> = serde_json::from_str(r#"[
+          {"key":"lib","projectUri":"lib","output":"lib","hasKotlin":false,"kotlinGoals":[],"dependencies":[]},
+          {"key":"app","projectUri":"app","output":"app","hasKotlin":false,"kotlinGoals":[],"dependencies":[{"key":"lib","scope":"compile","type":"jar","classifier":null}]},
+          {"key":"test-app","projectUri":"test-app","output":"app","hasKotlin":false,"kotlinGoals":[],"dependencies":[{"key":"lib","scope":"test","type":"test-jar","classifier":"tests"}]}
+        ]"#).unwrap();
+        let libraries =
+            BTreeMap::from([("lib".into(), ModuleLibraries { main: Some("main".into()), test: Some("test".into()) })]);
+        let result = consumers(&modules, &libraries);
+        assert_eq!(
+            result[0].libraries,
+            vec![Library { path: "test".into(), test: true }, Library { path: "main".into(), test: false }]
+        );
+        assert_eq!(result[1].libraries, vec![Library { path: "main".into(), test: false }]);
+        assert_eq!(result[2].libraries, vec![Library { path: "test".into(), test: true }]);
+    }
+
+    #[test]
+    fn publishes_complete_directories_and_cancellation_keeps_them_private() {
+        let directory = tempfile::tempdir().unwrap();
+        let pending = directory.path().join("pending");
+        let final_path = directory.path().join("published");
+        std::fs::create_dir(&pending).unwrap();
+        std::fs::write(pending.join("Channel.class"), "complete").unwrap();
+        let cancelled = CancellationToken::new();
+        cancelled.cancel();
+        assert!(publish(&pending, &final_path, &cancelled).is_err());
+        assert!(!final_path.exists());
+        assert!(pending.exists());
+        publish(&pending, &final_path, &CancellationToken::new()).unwrap();
+        assert!(!pending.exists());
+        assert_eq!(std::fs::read(final_path.join("Channel.class")).unwrap(), b"complete");
+    }
+
+    #[test]
+    fn never_runs_another_build_system_with_maven_output_properties() {
+        let directory = tempfile::tempdir().unwrap();
+        std::fs::write(directory.path().join("Cargo.toml"), "").unwrap();
+        let error = build(
+            directory.path(),
+            &BuildModel::default(),
+            Path::new("unused.jar"),
+            &directory.path().join("private"),
+            &CancellationToken::new(),
+        )
+        .err()
+        .unwrap();
+        assert_eq!(error.message, "Kotlin bridge requires a Maven build root");
+    }
+
+    #[test]
+    fn does_not_find_deleted_sources_in_build_outputs() {
+        let dir = tempfile::tempdir().unwrap();
+        std::fs::create_dir_all(dir.path().join("target/generated")).unwrap();
+        std::fs::write(dir.path().join("target/generated/Old.kt"), "").unwrap();
+        assert!(!has_kotlin(dir.path()));
+        std::fs::write(dir.path().join("New.kt"), "").unwrap();
+        assert!(has_kotlin(dir.path()));
+    }
+
+    #[test]
+    fn parses_sourcefile_and_rejects_truncated_classes() {
+        let mut class = vec![0xca, 0xfe, 0xba, 0xbe, 0, 0, 0, 52, 0, 3, 1, 0, 10];
+        class.extend_from_slice(b"SourceFile");
+        class.extend_from_slice(&[1, 0, 10]);
+        class.extend_from_slice(b"Channel.kt");
+        class.extend_from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 2, 0, 2]);
+        assert_eq!(kotlin_class(&class), Some(true));
+        for end in 0..class.len() {
+            assert!(kotlin_class(&class[..end]).is_none());
+        }
+        let offset = 26;
+        class[offset..offset + 10].copy_from_slice(b"Other.java");
+        assert_eq!(kotlin_class(&class), Some(false));
+    }
+}

crates/ide-build/src/lib.rs

@@ -5,20 +5,24 @@
 //! and merges what the last sync ([`sync_maven`] / [`sync_gradle`], which run
 //! Maven / Gradle in the background) cached for the project.
 
+pub mod application_update;
 pub mod compile;
 pub mod gradle;
+pub mod kotlin_bridge;
 pub mod maven;
+pub mod pom_edit;
 mod process;
 mod sync;
+pub mod web;
 mod xml;
 
 pub use gradle::{GradleModel, GradleProject, GradleTask};
-pub use maven::{MavenDependency, MavenModel, MavenPlugin, MavenProfile, MavenProject};
+pub use maven::{MavenDependency, MavenModel, MavenPlugin, MavenProfile, MavenProject, Omission};
 pub use sync::{SyncOptions, SyncProgress, sync_gradle, sync_maven};
 
 use serde::{Deserialize, Serialize};
 use specta::Type;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
 #[serde(rename_all = "camelCase")]
@@ -36,9 +40,21 @@ pub struct BuildModel {
 }
 
 /// Static model of the builds under `root`, merged with the sync results cached in `cache_dir`.
-pub fn load(root: &Path, cache_dir: &Path) -> BuildModel {
+/// Parent POMs are looked up in `maven_repo` (the configured local repository), else the default one.
+pub fn load(root: &Path, cache_dir: &Path, maven_repo: Option<PathBuf>) -> BuildModel {
+    load_linked(root, cache_dir, maven_repo, &ide_core::settings::MavenSettings::default())
+}
+
+/// Loads only linked Maven reactors, retaining an empty model so projects can be re-added.
+pub fn load_linked(
+    root: &Path,
+    cache_dir: &Path,
+    maven_repo: Option<PathBuf>,
+    settings: &ide_core::settings::MavenSettings,
+) -> BuildModel {
     let maven = maven::is_maven_project(root).then(|| {
-        let mut m = maven::load(root);
+        let mut m = maven::load_with_repo(root, maven_repo.or_else(maven::default_local_repo));
+        maven::UnlinkedProjects::from_model(&m, settings).filter(&mut m);
         sync::apply_maven_cache(root, cache_dir, &mut m);
         m
     });
@@ -49,6 +65,60 @@ pub fn load(root: &Path, cache_dir: &Path) -> BuildModel {
     BuildModel { maven, gradle }
 }
 
+/// A library the project depends on, as `groupId:artifactId:version`.
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct DependencyCoordinate {
+    /// Gradle builds resolve into the Gradle cache, Maven ones into the local repository.
+    pub gradle: bool,
+    pub group_id: String,
+    pub artifact_id: String,
+    pub version: String,
+}
+
+/// The external libraries of `model`, sorted and deduplicated: Maven dependencies
+/// (with the transitive ones the last sync read), except the build's own modules,
+/// `pom` imports and `system` scope; dependencies declared in the Gradle build scripts.
+pub fn dependency_coordinates(root: &Path, model: &BuildModel) -> Vec<DependencyCoordinate> {
+    let mut out = Vec::new();
+    if let Some(m) = &model.maven {
+        let modules: std::collections::HashSet<String> = m.projects.iter().map(MavenProject::key).collect();
+        let mut stack: Vec<&MavenDependency> = m.projects.iter().flat_map(|p| &p.dependencies).collect();
+        while let Some(d) = stack.pop() {
+            // Omitted occurrences (conflict losers, duplicates) are not on any classpath.
+            if !d.resolved() {
+                continue;
+            }
+            stack.extend(&d.children);
+            let Some(version) = d.version.as_deref().filter(|v| !v.is_empty() && !v.contains("${")) else {
+                continue;
+            };
+            if d.kind == "pom" || matches!(d.scope.as_str(), "import" | "system") {
+                continue;
+            }
+            if modules.contains(&format!("{}:{}", d.group_id, d.artifact_id)) {
+                continue;
+            }
+            out.push(DependencyCoordinate {
+                gradle: false,
+                group_id: d.group_id.clone(),
+                artifact_id: d.artifact_id.clone(),
+                version: version.to_owned(),
+            });
+        }
+    }
+    if let Some(g) = &model.gradle {
+        for script in g.projects.iter().filter_map(|p| p.build_file.as_ref()) {
+            let Ok(text) = std::fs::read_to_string(root.join(script)) else { continue };
+            out.extend(gradle::script_dependencies(&text).into_iter().map(|(group_id, artifact_id, version)| {
+                DependencyCoordinate { gradle: true, group_id, artifact_id, version }
+            }));
+        }
+    }
+    out.sort();
+    out.dedup();
+    out
+}
+
 /// Whether a created / changed / removed project-relative path can change the build model.
 pub fn affects_build(rel: &Path) -> bool {
     let Some(name) = rel.file_name().and_then(|n| n.to_str()) else { return false };
@@ -68,13 +138,64 @@ mod tests {
         let cache = tmp.path().join("cache");
         let root = tmp.path().join("p");
         std::fs::create_dir_all(root.join("svc")).unwrap();
-        assert_eq!(load(&root, &cache), BuildModel::default());
+        assert_eq!(load(&root, &cache, None), BuildModel::default());
         std::fs::write(root.join("svc/pom.xml"), "<project><artifactId>svc</artifactId></project>").unwrap();
         std::fs::write(root.join("build.gradle"), "").unwrap();
-        let m = load(&root, &cache);
+        let m = load(&root, &cache, None);
         assert_eq!(m.maven.unwrap().projects[0].pom, "svc/pom.xml");
         assert_eq!(m.gradle.unwrap().projects[0].path, ":");
         assert!(affects_build(Path::new("a/pom.xml")) && affects_build(Path::new("settings.gradle.kts")));
         assert!(!affects_build(Path::new("src/Main.java")));
     }
+
+    #[test]
+    fn dependency_coordinates_flatten_maven_trees_and_read_gradle_scripts() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        std::fs::write(root.join("build.gradle"), "dependencies { implementation 'org.a:x:1.0' }\n").unwrap();
+        let dep = |g: &str, a: &str, v: Option<&str>, children: Vec<MavenDependency>| MavenDependency {
+            group_id: g.into(),
+            artifact_id: a.into(),
+            version: v.map(Into::into),
+            kind: "jar".into(),
+            scope: "compile".into(),
+            children,
+            ..Default::default()
+        };
+        let maven = MavenModel {
+            projects: vec![
+                MavenProject {
+                    group_id: "me".into(),
+                    artifact_id: "app".into(),
+                    dependencies: vec![
+                        dep("me", "core", Some("1"), vec![]),
+                        dep(
+                            "org.b",
+                            "y",
+                            Some("2"),
+                            vec![
+                                dep("org.c", "z", Some("3"), vec![]),
+                                MavenDependency {
+                                    omitted: Some(Omission::Conflict),
+                                    conflict_with: Some("3".into()),
+                                    ..dep("org.c", "z", Some("1"), vec![])
+                                },
+                            ],
+                        ),
+                        dep("org.d", "unresolved", Some("${v}"), vec![]),
+                    ],
+                    ..Default::default()
+                },
+                MavenProject { group_id: "me".into(), artifact_id: "core".into(), ..Default::default() },
+            ],
+            ..Default::default()
+        };
+        let gradle = gradle::load(root);
+        let model = BuildModel { maven: Some(maven), gradle };
+        let names: Vec<String> = dependency_coordinates(root, &model)
+            .into_iter()
+            .map(|c| format!("{}{}:{}:{}", if c.gradle { "G " } else { "M " }, c.group_id, c.artifact_id, c.version))
+            .collect();
+        assert_eq!(names, ["M org.b:y:2", "M org.c:z:3", "G org.a:x:1.0"]);
+    }
 }

crates/ide-build/src/maven.rs

@@ -92,6 +92,8 @@ pub struct MavenProject {
     pub java_version: Option<u32>,
     /// Maven launcher: the nearest `mvnw` up to the project root (absolute), else `mvn`.
     pub command: String,
+    /// Options before the goals (`-s`, `-Dmaven.repo.local=`); filled in by the shell from settings.
+    pub options: Vec<String>,
     /// Environment for runs (`JAVA_HOME` of the matching JDK); filled in by the shell.
     pub env: BTreeMap<String, String>,
 }
@@ -128,6 +130,37 @@ pub struct MavenDependency {
     pub optional: bool,
     /// Transitive dependencies (only after a sync).
     pub children: Vec<MavenDependency>,
+    /// Why Maven left this occurrence out of the resolved graph (`dependency:tree -Dverbose`).
+    #[serde(default)]
+    #[specta(optional)]
+    pub omitted: Option<Omission>,
+    /// The version that won when `omitted` is `Conflict`.
+    #[serde(default)]
+    #[specta(optional)]
+    pub conflict_with: Option<String>,
+    /// The version requested before `<dependencyManagement>` replaced it.
+    #[serde(default)]
+    #[specta(optional)]
+    pub managed_from: Option<String>,
+}
+
+impl MavenDependency {
+    /// Part of the resolved graph (not a verbose-tree placeholder for an omitted occurrence).
+    pub fn resolved(&self) -> bool {
+        self.omitted.is_none()
+    }
+}
+
+/// Why a dependency occurrence is not part of the resolved graph.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum Omission {
+    /// Another occurrence of the same version is nearer the root.
+    Duplicate,
+    /// Another version is nearer the root (or declared first) and wins.
+    Conflict,
+    /// The artifact depends on itself through this path.
+    Cycle,
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
@@ -368,6 +401,9 @@ struct Inherited {
     managed: Vec<RawDep>,
     plugins: Vec<RawPlugin>,
     managed_plugins: Vec<RawPlugin>,
+    /// `<id>`, `activeByDefault`: profiles of the POM and its ancestors —
+    /// Maven lets a child enable a parent's profiles with `-P`.
+    profiles: Vec<(String, bool)>,
 }
 
 fn merge_by<T: Clone>(base: &mut Vec<T>, own: &[T], key: impl Fn(&T) -> String) {
@@ -410,7 +446,7 @@ struct Resolver {
 }
 
 /// `~/.m2/repository`, or `<localRepository>` from `~/.m2/settings.xml`.
-fn default_local_repo() -> Option<PathBuf> {
+pub(crate) fn default_local_repo() -> Option<PathBuf> {
     let m2 = dirs::home_dir()?.join(".m2");
     if let Some(settings) = std::fs::read_to_string(m2.join("settings.xml")).ok().and_then(|t| xml::parse(&t))
         && let Some(repo) = settings.text_of("localRepository")
@@ -490,6 +526,11 @@ impl Resolver {
             merge_by(&mut ctx.deps, &p.deps, RawDep::key);
             merge_plugins(&mut ctx.plugins, &p.plugins);
         }
+        merge_by(
+            &mut ctx.profiles,
+            &pom.profiles.iter().map(|p| (p.id.clone(), p.active_by_default)).collect::<Vec<_>>(),
+            |(id, _)| id.clone(),
+        );
         // Managed dependencies: own entries win; imported BOMs fill the gaps.
         let props = self.properties_for(&pom, &ctx, &dir);
         let mut imported: Vec<RawDep> = Vec::new();
@@ -560,6 +601,72 @@ impl Resolver {
     }
 }
 
+/// Files and source/resource trees consumed by a launch build. Unresolved custom
+/// roots disable reuse rather than silently omitting an input.
+pub(crate) fn launch_inputs(
+    root: &Path,
+    projects: &[&MavenProject],
+    local_repo: Option<PathBuf>,
+) -> Option<Vec<PathBuf>> {
+    fn roots(el: &Element, parent: &str, dir: &Path, out: &mut Vec<PathBuf>) -> Option<()> {
+        let input =
+            matches!(el.name.as_str(), "sourceDirectory" | "testSourceDirectory" | "sourceDir" | "testSourceDir")
+                || (matches!(parent, "sources" | "sourceDirs" | "testSources" | "testSourceDirs")
+                    && matches!(el.name.as_str(), "source" | "sourceDir" | "testSourceDir"))
+                || (matches!(parent, "resource" | "testResource" | "source" | "testSource") && el.name == "directory")
+                || (parent == "filters" && el.name == "filter");
+        // Profile activation may depend on the presence of an otherwise unrelated file.
+        let activation = parent == "file" && matches!(el.name.as_str(), "exists" | "missing");
+        if input || activation {
+            // Other properties can be overridden by -D, profiles or settings.
+            // Without Maven's effective roots, conservatively disable reuse for them.
+            let value = el
+                .text
+                .trim()
+                .replace("${project.basedir}", &dir.to_string_lossy())
+                .replace("${basedir}", &dir.to_string_lossy());
+            if value.contains("${") {
+                return None;
+            }
+            if !value.is_empty() {
+                out.push(dir.join(value));
+            }
+        }
+        for child in &el.children {
+            roots(child, &el.name, dir, out)?;
+        }
+        Some(())
+    }
+    let mut resolver = Resolver::new(local_repo.or_else(default_local_repo));
+    let mut out = Vec::new();
+    for project in projects {
+        let dir = root.join(&project.dir);
+        // Include all conventional language/resource roots, including nonstandard files under src.
+        out.push(dir.join("src"));
+        let pom = root.join(&project.pom);
+        resolver.context(&pom, 0);
+        let mut path = pom;
+        let mut seen = HashSet::new();
+        loop {
+            let canonical = dunce::canonicalize(&path).ok()?;
+            if !seen.insert(canonical) || seen.len() > MAX_PARENT_DEPTH {
+                return None;
+            }
+            out.push(path.clone());
+            let text = std::fs::read_to_string(&path).ok()?;
+            roots(&xml::parse(&text)?, "", &dir, &mut out)?;
+            let raw = resolver.pom(&path)?;
+            let Some(parent) = raw.parent else { break };
+            path = resolver.parent_path(path.parent()?, &parent)?;
+        }
+    }
+    // Also track imported BOMs read while resolving inheritance.
+    out.extend(resolver.poms.into_keys());
+    out.sort();
+    out.dedup();
+    Some(out)
+}
+
 // ---------------------------------------------------------------- plugins
 
 /// `maven-clean-plugin` → `clean`, `spring-boot-maven-plugin` → `spring-boot`.
@@ -869,7 +976,7 @@ pub(crate) fn load_with_repo(root: &Path, local_repo: Option<PathBuf>) -> MavenM
                 classifier: d.classifier.clone(),
                 scope: d.scope.clone().or_else(|| managed_scope(d)).unwrap_or_else(|| "compile".into()),
                 optional: d.optional,
-                children: Vec::new(),
+                ..MavenDependency::default()
             })
             .collect();
 
@@ -902,9 +1009,10 @@ pub(crate) fn load_with_repo(root: &Path, local_repo: Option<PathBuf>) -> MavenM
             .or_else(|| pom.compiler_release.as_deref().map(i))
             .and_then(|v| java_version(&v));
 
-        for p in &pom.profiles {
-            if !model.profiles.iter().any(|x| x.id == p.id) {
-                model.profiles.push(MavenProfile { id: p.id.clone(), active_by_default: p.active_by_default });
+        // The project can activate the profiles of its own POM and its ancestors'.
+        for (id, active) in &ctx.profiles {
+            if !model.profiles.iter().any(|x| x.id == *id) {
+                model.profiles.push(MavenProfile { id: id.clone(), active_by_default: *active });
             }
         }
         let artifact_id = i(&pom.artifact_id);
@@ -921,9 +1029,10 @@ pub(crate) fn load_with_repo(root: &Path, local_repo: Option<PathBuf>) -> MavenM
             aggregated,
             plugins,
             dependencies,
-            profiles: pom.profiles.iter().map(|p| p.id.clone()).collect(),
+            profiles: ctx.profiles.iter().map(|(id, _)| id.clone()).collect(),
             java_version: jv,
             command: wrapper(root, &dir),
+            options: Vec::new(),
             env: BTreeMap::new(),
         });
         for m in modules.into_iter().rev() {
@@ -933,6 +1042,67 @@ pub(crate) fn load_with_repo(root: &Path, local_repo: Option<PathBuf>) -> MavenM
     model
 }
 
+/// Shared linkage decision for every Maven consumer, including modules outside a reactor directory.
+#[derive(Default)]
+pub struct UnlinkedProjects {
+    poms: std::collections::BTreeSet<String>,
+}
+
+impl UnlinkedProjects {
+    pub fn load(root: &Path, settings: &ide_core::settings::MavenSettings) -> Self {
+        if settings.unlinked_projects.is_empty() {
+            return Self::default();
+        }
+        Self::from_model(&load(root), settings)
+    }
+
+    pub fn from_model(model: &MavenModel, settings: &ide_core::settings::MavenSettings) -> Self {
+        let mut result = Self::default();
+        let mut pending = settings.unlinked_projects.clone();
+        while let Some(pom) = pending.pop() {
+            let pom = normalized_pom(&pom);
+            if !result.poms.insert(pom.clone()) {
+                continue;
+            }
+            if let Some(project) = model.projects.iter().find(|p| normalized_pom(&p.pom) == pom) {
+                pending.extend(project.modules.iter().cloned());
+            }
+        }
+        result
+    }
+
+    pub fn contains(&self, pom: &str) -> bool {
+        self.poms.contains(&normalized_pom(pom))
+    }
+
+    pub fn poms(&self) -> impl Iterator<Item = &str> {
+        self.poms.iter().map(String::as_str)
+    }
+
+    pub fn filter(&self, model: &mut MavenModel) {
+        model.projects.retain(|p| !self.contains(&p.pom));
+        for project in &mut model.projects {
+            project.modules.retain(|p| !self.contains(p));
+        }
+        model.profiles.retain(|p| model.projects.iter().any(|project| project.profiles.contains(&p.id)));
+    }
+}
+
+fn normalized_pom(pom: &str) -> String {
+    let pom = pom.replace('\\', "/");
+    let mut parts = Vec::new();
+    for part in pom.split('/') {
+        match part {
+            "" | "." => {}
+            ".." if parts.last().is_some_and(|p| *p != "..") => {
+                parts.pop();
+            }
+            part => parts.push(part),
+        }
+    }
+    parts.join("/")
+}
+
 /// Every POM of the model (for change detection).
 pub fn build_files(root: &Path, model: &MavenModel) -> Vec<PathBuf> {
     model.projects.iter().map(|p| root.join(&p.pom)).collect()
@@ -965,7 +1135,7 @@ pub fn parse_effective_pom(text: &str) -> Vec<(String, Vec<MavenPlugin>, Vec<Mav
                     classifier: d.classifier.clone(),
                     scope: d.scope.clone().unwrap_or_else(|| "compile".into()),
                     optional: d.optional,
-                    children: Vec::new(),
+                    ..MavenDependency::default()
                 })
                 .collect();
             (format!("{group}:{}", raw.artifact_id), plugins, deps)
@@ -973,13 +1143,16 @@ pub fn parse_effective_pom(text: &str) -> Vec<(String, Vec<MavenPlugin>, Vec<Mav
         .collect()
 }
 
-/// `g:a:type[:classifier]:version[:scope]` from a `dependency:tree` line.
+/// `g:a:type[:classifier]:version[:scope]` from a `dependency:tree` line, with the
+/// `-Dverbose` annotations: `(g:a:jar:1:compile - omitted for conflict with 2)`,
+/// `g:a:jar:1:compile (version managed from 0.9)`, `(optional)`.
 fn parse_coords(s: &str) -> Option<MavenDependency> {
     let s = s.trim();
-    let (coords, extra) = match s.find(" (") {
-        Some(i) => (&s[..i], &s[i..]),
-        None => (s, ""),
+    let (s, wrapped) = match s.strip_prefix('(').and_then(|r| r.strip_suffix(')')) {
+        Some(inner) => (inner, true),
+        None => (s, false),
     };
+    let (coords, notes) = s.split_once(' ').unwrap_or((s, ""));
     let parts: Vec<&str> = coords.split(':').collect();
     let (g, a, t, c, v, scope) = match parts.as_slice() {
         [g, a, t, v] => (g, a, t, None, v, None),
@@ -987,16 +1160,35 @@ fn parse_coords(s: &str) -> Option<MavenDependency> {
         [g, a, t, c, v, s] => (g, a, t, Some(*c), v, Some(*s)),
         _ => return None,
     };
-    Some(MavenDependency {
+    let mut dep = MavenDependency {
         group_id: (*g).to_owned(),
         artifact_id: (*a).to_owned(),
         version: Some((*v).to_owned()),
         kind: (*t).to_owned(),
         classifier: c.map(|c| (*c).to_owned()),
         scope: scope.unwrap_or("compile").to_owned(),
-        optional: extra.contains("optional"),
-        children: Vec::new(),
-    })
+        ..MavenDependency::default()
+    };
+    let notes = notes.replace(['(', ')'], ";").replace(" - ", ";");
+    for note in notes.split(';').map(|n| n.trim().trim_start_matches("- ").trim()) {
+        if note == "optional" {
+            dep.optional = true;
+        } else if let Some(winner) = note.strip_prefix("omitted for conflict with ") {
+            dep.omitted = Some(Omission::Conflict);
+            dep.conflict_with = Some(winner.trim().to_owned());
+        } else if note == "omitted for duplicate" {
+            dep.omitted = Some(Omission::Duplicate);
+        } else if note == "omitted for cycle" {
+            dep.omitted = Some(Omission::Cycle);
+        } else if let Some(from) = note.strip_prefix("version managed from ") {
+            dep.managed_from = Some(from.trim().to_owned());
+        }
+    }
+    // A parenthesised line is always an omitted occurrence, even with an unknown reason.
+    if wrapped && dep.omitted.is_none() {
+        dep.omitted = Some(Omission::Duplicate);
+    }
+    Some(dep)
 }
 
 fn insert_at(list: &mut Vec<MavenDependency>, depth: usize, dep: MavenDependency) {
@@ -1163,9 +1355,41 @@ mod tests {
         let profiles: Vec<(&str, bool)> = model.profiles.iter().map(|p| (p.id.as_str(), p.active_by_default)).collect();
         assert_eq!(profiles, [("dev", true), ("extra", false)]);
         assert_eq!(parent.profiles, ["dev", "extra"]);
+        assert_eq!(core.profiles, ["dev", "extra"], "a module inherits its parent's profiles");
         assert!(model.projects.iter().all(|p| p.command == if cfg!(windows) { "mvn.cmd" } else { "mvn" }));
     }
 
+    #[test]
+    fn profiles_of_a_parent_pom_are_inherited() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        write(
+            root,
+            "pom.xml",
+            r#"<project><groupId>demo</groupId><artifactId>parent</artifactId><version>1.0</version>
+              <packaging>pom</packaging><modules><module>child</module></modules>
+              <profiles>
+                <profile><id>jdk8</id></profile>
+                <profile><id>jdk21</id><activation><activeByDefault>true</activeByDefault></activation></profile>
+              </profiles>
+            </project>"#,
+        );
+        write(
+            root,
+            "child/pom.xml",
+            r#"<project><parent><groupId>demo</groupId><artifactId>parent</artifactId><version>1.0</version></parent>
+              <artifactId>child</artifactId>
+              <profiles><profile><id>own</id></profile></profiles>
+            </project>"#,
+        );
+        let model = load_with_repo(root, None);
+        let child = &model.projects[1];
+        // `-Pjdk8` on the module activates the parent's profile, so it is listed.
+        assert_eq!(child.profiles, ["jdk8", "jdk21", "own"]);
+        let profiles: Vec<(&str, bool)> = model.profiles.iter().map(|p| (p.id.as_str(), p.active_by_default)).collect();
+        assert_eq!(profiles, [("jdk8", false), ("jdk21", true), ("own", false)]);
+    }
+
     #[test]
     fn parent_and_bom_from_the_local_repository_and_wrapper() {
         let tmp = tempfile::tempdir().unwrap();
@@ -1324,4 +1548,124 @@ mod tests {
         );
         assert_eq!(trees[2].1[0].scope, "compile");
     }
+
+    /// `mvn org.apache.maven.plugins:maven-dependency-plugin:3.8.1:tree -Dverbose` on a project
+    /// whose libraries ask for different commons-lang3 / commons-text / guava versions.
+    #[test]
+    fn verbose_dependency_tree_output() {
+        let trees = parse_dependency_tree(include_str!("../testdata/dependency-tree-verbose.txt"));
+        assert_eq!(trees.len(), 1);
+        let (key, deps) = &trees[0];
+        assert_eq!(key, "demo:conflict-demo");
+        let direct: Vec<&str> = deps.iter().map(|d| d.artifact_id.as_str()).collect();
+        assert_eq!(direct, ["hamcrest-core", "commons-text", "commons-configuration2", "guava", "guice", "junit"]);
+        assert!(deps.iter().all(MavenDependency::resolved));
+
+        let config = &deps[2].children;
+        let lang3 = &config[0];
+        assert_eq!(
+            (lang3.artifact_id.as_str(), lang3.version.as_deref(), lang3.omitted, lang3.conflict_with.as_deref()),
+            ("commons-lang3", Some("3.14.0"), Some(Omission::Conflict), Some("3.12.0"))
+        );
+        assert_eq!(lang3.scope, "compile");
+        let logging = &config[2];
+        assert_eq!(
+            (logging.version.as_deref(), logging.managed_from.as_deref(), logging.omitted),
+            (Some("1.2"), Some("1.3.0"), None)
+        );
+        let guava = &deps[4].children[2];
+        assert_eq!((guava.version.as_deref(), guava.conflict_with.as_deref()), (Some("30.1-jre"), Some("32.1.3-jre")));
+        let hamcrest = &deps[5].children[0];
+        assert_eq!((hamcrest.omitted, hamcrest.scope.as_str()), (Some(Omission::Duplicate), "test"));
+        assert_eq!(deps[1].children[0].omitted, None, "the winning commons-lang3");
+    }
+
+    #[test]
+    fn verbose_annotations() {
+        // (line, omitted, conflict winner, managed from, optional)
+        type Case<'a> = (&'a str, Option<Omission>, Option<&'a str>, Option<&'a str>, bool);
+        let cases: &[Case] = &[
+            ("(g:a:jar:1:compile - omitted for cycle)", Some(Omission::Cycle), None, None, false),
+            (
+                "(g:a:jar:1:compile - version managed from 0.9; omitted for duplicate)",
+                Some(Omission::Duplicate),
+                None,
+                Some("0.9"),
+                false,
+            ),
+            ("g:a:jar:1:compile (optional)", None, None, None, true),
+            (
+                "(g:a:jar:1:runtime (optional) - omitted for conflict with 2)",
+                Some(Omission::Conflict),
+                Some("2"),
+                None,
+                true,
+            ),
+            (
+                "(g:a:jar:1:compile - scope updated from runtime; omitted for duplicate)",
+                Some(Omission::Duplicate),
+                None,
+                None,
+                false,
+            ),
+            (
+                "g:a:jar:1:compile (version managed from 0.9; scope managed from runtime)",
+                None,
+                None,
+                Some("0.9"),
+                false,
+            ),
+        ];
+        for (line, omitted, winner, managed, optional) in cases {
+            let d = parse_coords(line).unwrap();
+            assert_eq!(
+                (d.omitted, d.conflict_with.as_deref(), d.managed_from.as_deref(), d.optional),
+                (*omitted, *winner, *managed, *optional),
+                "{line}"
+            );
+            assert_eq!((d.group_id.as_str(), d.version.as_deref()), ("g", Some("1")), "{line}");
+        }
+    }
+}
+
+#[cfg(test)]
+mod linkage_tests {
+    use super::*;
+    use ide_core::settings::MavenSettings;
+
+    #[test]
+    fn excludes_reactor_modules_and_profiles_but_keeps_other_roots() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        for (name, body) in [
+            (
+                "a",
+                "<modules><module>child</module><module>../shared</module></modules><profiles><profile><id>only-a</id></profile></profiles>",
+            ),
+            ("a/child", ""),
+            ("shared", ""),
+            ("b", ""),
+        ] {
+            std::fs::create_dir_all(root.join(name)).unwrap();
+            std::fs::write(
+                root.join(name).join("pom.xml"),
+                format!("<project><artifactId>{name}</artifactId>{body}</project>"),
+            )
+            .unwrap();
+        }
+        let original = load_with_repo(root, None);
+        let settings = MavenSettings { unlinked_projects: vec!["./a/pom.xml".into()], ..Default::default() };
+        let unlinked = UnlinkedProjects::from_model(&original, &settings);
+        assert!(unlinked.contains("a/child/pom.xml"));
+        assert!(unlinked.contains("shared/pom.xml"));
+        assert!(unlinked.contains("a/../shared/pom.xml"));
+        assert!(!unlinked.contains("b/pom.xml"));
+        let mut model = original.clone();
+        unlinked.filter(&mut model);
+        assert_eq!(model.projects.iter().map(|p| p.pom.as_str()).collect::<Vec<_>>(), ["b/pom.xml"]);
+        assert!(model.profiles.is_empty());
+        let mut restored = original.clone();
+        UnlinkedProjects::from_model(&original, &MavenSettings::default()).filter(&mut restored);
+        assert_eq!(restored, original);
+    }
 }

crates/ide-build/src/pom_edit.rs

@@ -0,0 +1,336 @@
+//! Edits of `pom.xml` text for the dependency analyzer: finding where a direct
+//! dependency is declared and adding an `<exclusion>` to it, in the style
+//! (indentation, line endings, one-line elements) of the surrounding POM.
+
+use crate::maven::{self, MavenModel};
+use crate::xml::{self, Element};
+use ide_core::{Pos, Range, TextEdit};
+use serde::{Deserialize, Serialize};
+use specta::Type;
+use std::collections::{HashMap, HashSet};
+
+/// `groupId:artifactId` of a dependency.
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct ArtifactKey {
+    pub group_id: String,
+    pub artifact_id: String,
+}
+
+impl ArtifactKey {
+    pub fn new(group_id: impl Into<String>, artifact_id: impl Into<String>) -> Self {
+        Self { group_id: group_id.into(), artifact_id: artifact_id.into() }
+    }
+}
+
+impl std::fmt::Display for ArtifactKey {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}:{}", self.group_id, self.artifact_id)
+    }
+}
+
+/// What adding an exclusion does to a POM.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum Exclusion {
+    /// The edit that adds it.
+    Edit(TextEdit),
+    /// The dependency already excludes it (or everything, `*:*`).
+    Present,
+}
+
+/// Properties the coordinates of a POM's dependencies may refer to.
+fn properties(project: &Element) -> HashMap<String, String> {
+    let mut props: HashMap<String, String> = project
+        .child("properties")
+        .map(|p| p.children.iter().map(|c| (c.name.clone(), c.text.trim().to_owned())).collect())
+        .unwrap_or_default();
+    let own_or_parent = |name: &str| project.text_of(name).or_else(|| project.child("parent")?.text_of(name));
+    for (key, value) in [
+        ("project.groupId", own_or_parent("groupId")),
+        ("project.version", own_or_parent("version")),
+        ("project.artifactId", project.text_of("artifactId")),
+    ] {
+        if let Some(v) = value {
+            props.insert(key.into(), v);
+        }
+    }
+    props
+}
+
+fn matches(e: &Element, key: &ArtifactKey, props: &HashMap<String, String>) -> bool {
+    let text = |name: &str| e.text_of(name).map(|t| maven::interpolate(&t, props));
+    text("groupId").as_deref() == Some(key.group_id.as_str())
+        && text("artifactId").as_deref() == Some(key.artifact_id.as_str())
+}
+
+/// The `<dependency>` declaring `key` in the project's `<dependencies>`, else in a
+/// profile's (never `<dependencyManagement>`, which declares no dependency).
+fn find_dependency<'a>(project: &'a Element, key: &ArtifactKey) -> Option<&'a Element> {
+    let props = properties(project);
+    let own = project.list("dependencies", "dependency");
+    let profiles = project.list("profiles", "profile").into_iter().flat_map(|p| p.list("dependencies", "dependency"));
+    own.into_iter().chain(profiles).find(|d| matches(d, key, &props))
+}
+
+/// 0-based line / UTF-16 column of byte offset `at`.
+fn pos_at(text: &str, at: usize) -> Pos {
+    let before = &text[..at];
+    let line_start = before.rfind('\n').map_or(0, |i| i + 1);
+    Pos::new(before.matches('\n').count() as u32, before[line_start..].encode_utf16().count() as u32)
+}
+
+fn line_start(text: &str, at: usize) -> usize {
+    text[..at].rfind('\n').map_or(0, |i| i + 1)
+}
+
+/// The whitespace before `at` on its line, or `None` when other text precedes it there.
+fn indent_before(text: &str, at: usize) -> Option<&str> {
+    let ws = &text[line_start(text, at)..at];
+    ws.chars().all(|c| c == ' ' || c == '\t').then_some(ws)
+}
+
+/// One level of indentation: what the first child of `e` adds to `e`'s, else two spaces.
+fn indent_unit(text: &str, e: &Element) -> String {
+    let outer = indent_before(text, e.start);
+    let inner = e.children.first().and_then(|c| indent_before(text, c.start));
+    match (outer, inner) {
+        (Some(o), Some(i)) if i.len() > o.len() && i.starts_with(o) => i[o.len()..].to_owned(),
+        (_, Some(i)) if i.starts_with('\t') => "\t".into(),
+        _ => "  ".into(),
+    }
+}
+
+fn escape(s: &str) -> String {
+    s.replace('&', "&amp;").replace('<', "&lt;")
+}
+
+/// Range of the `<artifactId>` of the dependency declaring `key` in `text` (a POM), or of
+/// the whole `<dependency>` when it has none; `None` when the POM does not declare it.
+pub fn declaration(text: &str, key: &ArtifactKey) -> Option<Range> {
+    let project = xml::parse(text)?;
+    let dep = find_dependency(&project, key)?;
+    let target = dep.child("artifactId").unwrap_or(dep);
+    Some(Range::new(pos_at(text, target.start), pos_at(text, target.end)))
+}
+
+/// Adds `exclude` to the `<exclusions>` of the dependency declaring `dependency` in `text`
+/// (a POM); `None` when the POM does not declare it.
+pub fn add_exclusion(text: &str, dependency: &ArtifactKey, exclude: &ArtifactKey) -> Option<Exclusion> {
+    let project = xml::parse(text)?;
+    let dep = find_dependency(&project, dependency)?;
+    let nl = if text.contains("\r\n") { "\r\n" } else { "\n" };
+    let unit = indent_unit(text, dep);
+    let (g, a) = (escape(&exclude.group_id), escape(&exclude.artifact_id));
+
+    // Insert `block` (lines relative to `parent`'s indentation + one level) before `parent`'s
+    // end tag; on one line (`compact`) when `parent` is not laid out one element per line.
+    let insert = |parent: &Element, lines: &[(usize, String)], compact: String| {
+        let close_on_own_line = indent_before(text, parent.inner_end).is_some() && parent.inner_end < parent.end;
+        let (at, new_text) = match indent_before(text, parent.start) {
+            Some(base) if close_on_own_line => {
+                let mut out = String::new();
+                for (depth, line) in lines {
+                    out.push_str(base);
+                    out.push_str(&unit.repeat(depth + 1));
+                    out.push_str(line);
+                    out.push_str(nl);
+                }
+                (line_start(text, parent.inner_end), out)
+            }
+            _ => (parent.inner_end, compact),
+        };
+        let p = pos_at(text, at);
+        Exclusion::Edit(TextEdit { range: Range::point(p), new_text })
+    };
+    let exclusion_lines = |depth: usize| {
+        vec![
+            (depth, "<exclusion>".to_owned()),
+            (depth + 1, format!("<groupId>{g}</groupId>")),
+            (depth + 1, format!("<artifactId>{a}</artifactId>")),
+            (depth, "</exclusion>".to_owned()),
+        ]
+    };
+    let compact = format!("<exclusion><groupId>{g}</groupId><artifactId>{a}</artifactId></exclusion>");
+
+    if let Some(exclusions) = dep.child("exclusions") {
+        let props = properties(&project);
+        let wildcard = ArtifactKey::new("*", "*");
+        let any_artifact = ArtifactKey::new(exclude.group_id.clone(), "*");
+        if exclusions
+            .children_named("exclusion")
+            .any(|e| [exclude, &wildcard, &any_artifact].iter().any(|k| matches(e, k, &props)))
+        {
+            return Some(Exclusion::Present);
+        }
+        return Some(insert(exclusions, &exclusion_lines(0), compact));
+    }
+    let mut lines = vec![(0, "<exclusions>".to_owned())];
+    lines.extend(exclusion_lines(1));
+    lines.push((0, "</exclusions>".to_owned()));
+    Some(insert(dep, &lines, format!("<exclusions>{compact}</exclusions>")))
+}
+
+/// The POMs that may declare a dependency of the module `pom` (project-relative), nearest
+/// first: the module's own, then its parents that are part of the project.
+pub fn declaring_poms(model: &MavenModel, pom: &str) -> Vec<String> {
+    let mut out: Vec<String> = Vec::new();
+    let mut seen: HashSet<String> = HashSet::new();
+    let mut current = model.projects.iter().find(|p| p.pom == pom);
+    while let Some(p) = current {
+        if !seen.insert(p.pom.clone()) {
+            break;
+        }
+        out.push(p.pom.clone());
+        current = p.parent.as_deref().and_then(|coords| {
+            model.projects.iter().find(|q| format!("{}:{}:{}", q.group_id, q.artifact_id, q.version) == coords)
+        });
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn apply(text: &str, edit: &TextEdit) -> String {
+        let offset = |p: Pos| {
+            let start: usize = text.split_inclusive('\n').take(p.line as usize).map(str::len).sum();
+            let line = &text[start..];
+            start + line.char_indices().nth(p.col as usize).map_or(line.len(), |(i, _)| i)
+        };
+        let (from, to) = (offset(edit.range.start), offset(edit.range.end));
+        format!("{}{}{}", &text[..from], edit.new_text, &text[to..])
+    }
+
+    fn exclude(text: &str, dep: (&str, &str), excl: (&str, &str)) -> Option<String> {
+        match add_exclusion(text, &ArtifactKey::new(dep.0, dep.1), &ArtifactKey::new(excl.0, excl.1))? {
+            Exclusion::Edit(e) => Some(apply(text, &e)),
+            Exclusion::Present => Some(text.to_owned()),
+        }
+    }
+
+    const POM: &str = "<project>
+    <groupId>demo</groupId>
+    <properties>
+        <guice.group>com.google.inject</guice.group>
+    </properties>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>com.google.inject</groupId>
+                <artifactId>guice</artifactId>
+                <version>5.1.0</version>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+    <dependencies>
+        <dependency>
+            <groupId>${guice.group}</groupId>
+            <artifactId>guice</artifactId>
+        </dependency>
+    </dependencies>
+</project>
+";
+
+    #[test]
+    fn adds_exclusions_to_the_declaration_not_the_managed_entry() {
+        let out = exclude(POM, ("com.google.inject", "guice"), ("com.google.guava", "guava")).unwrap();
+        let expected = POM.replace(
+            "            <artifactId>guice</artifactId>\n        </dependency>\n    </dependencies>",
+            "            <artifactId>guice</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>com.google.guava</groupId>
+                    <artifactId>guava</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+    </dependencies>",
+        );
+        assert_eq!(out, expected);
+        // A second exclusion joins the first; excluding it again changes nothing.
+        let twice = exclude(&out, ("com.google.inject", "guice"), ("aopalliance", "aopalliance")).unwrap();
+        assert!(twice.contains(
+            "                </exclusion>
+                <exclusion>
+                    <groupId>aopalliance</groupId>
+                    <artifactId>aopalliance</artifactId>
+                </exclusion>
+            </exclusions>"
+        ));
+        assert_eq!(exclude(&twice, ("com.google.inject", "guice"), ("aopalliance", "aopalliance")).unwrap(), twice);
+    }
+
+    #[test]
+    fn keeps_tabs_crlf_and_one_line_dependencies() {
+        let tabs = "<project>\r\n\t<dependencies>\r\n\t\t<dependency>\r\n\t\t\t<groupId>g</groupId>\r\n\t\t\t<artifactId>a</artifactId>\r\n\t\t</dependency>\r\n\t</dependencies>\r\n</project>\r\n";
+        let out = exclude(tabs, ("g", "a"), ("x", "y")).unwrap();
+        assert!(out.contains("<artifactId>a</artifactId>\r\n\t\t\t<exclusions>\r\n\t\t\t\t<exclusion>\r\n\t\t\t\t\t<groupId>x</groupId>\r\n"));
+        assert!(out.contains("\t\t\t</exclusions>\r\n\t\t</dependency>"));
+
+        let inline = "<project><dependencies><dependency><groupId>g</groupId><artifactId>a</artifactId></dependency></dependencies></project>";
+        assert_eq!(
+            exclude(inline, ("g", "a"), ("x", "y")).unwrap(),
+            "<project><dependencies><dependency><groupId>g</groupId><artifactId>a</artifactId><exclusions><exclusion><groupId>x</groupId><artifactId>y</artifactId></exclusion></exclusions></dependency></dependencies></project>"
+        );
+    }
+
+    #[test]
+    fn wildcards_profiles_and_missing_declarations() {
+        let pom = "<project>
+  <profiles>
+    <profile>
+      <dependencies>
+        <dependency>
+          <groupId>g</groupId><artifactId>a</artifactId>
+          <exclusions><exclusion><groupId>x</groupId><artifactId>*</artifactId></exclusion></exclusions>
+        </dependency>
+      </dependencies>
+    </profile>
+  </profiles>
+</project>";
+        let key = ArtifactKey::new("g", "a");
+        assert_eq!(add_exclusion(pom, &key, &ArtifactKey::new("x", "y")), Some(Exclusion::Present));
+        let out = exclude(pom, ("g", "a"), ("z", "w")).unwrap();
+        assert!(out.contains(
+            "</exclusion><exclusion><groupId>z</groupId><artifactId>w</artifactId></exclusion></exclusions>"
+        ));
+        assert_eq!(add_exclusion(pom, &ArtifactKey::new("g", "other"), &key), None);
+        assert_eq!(add_exclusion("not xml", &key, &key), None);
+    }
+
+    #[test]
+    fn declaration_ranges_use_utf16_columns() {
+        let pom = "<project><!-- é😀 --><dependencies>\n  <dependency><groupId>g</groupId><artifactId>a</artifactId></dependency>\n</dependencies></project>";
+        let r = declaration(pom, &ArtifactKey::new("g", "a")).unwrap();
+        assert_eq!(r, Range::new(Pos::new(1, 34), Pos::new(1, 60)));
+        let first = "<project><!-- é😀 --><dependencies><dependency><groupId>g</groupId><artifactId>a</artifactId>";
+        let r = declaration(&format!("{first}</dependency></dependencies></project>"), &ArtifactKey::new("g", "a"))
+            .unwrap();
+        let start = first.find("<artifactId>").unwrap();
+        assert_eq!(r.start.col as usize, first[..start].encode_utf16().count());
+    }
+
+    #[test]
+    fn declaring_poms_follow_parents_inside_the_project() {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        let write = |rel: &str, text: &str| {
+            let p = root.join(rel);
+            std::fs::create_dir_all(p.parent().unwrap()).unwrap();
+            std::fs::write(p, text).unwrap();
+        };
+        write(
+            "pom.xml",
+            "<project><groupId>d</groupId><artifactId>parent</artifactId><version>1</version><packaging>pom</packaging><modules><module>app</module></modules></project>",
+        );
+        write(
+            "app/pom.xml",
+            "<project><parent><groupId>d</groupId><artifactId>parent</artifactId><version>1</version></parent><artifactId>app</artifactId></project>",
+        );
+        let model = maven::load_with_repo(root, None);
+        assert_eq!(declaring_poms(&model, "app/pom.xml"), ["app/pom.xml", "pom.xml"]);
+        assert_eq!(declaring_poms(&model, "pom.xml"), ["pom.xml"]);
+        assert!(declaring_poms(&model, "missing/pom.xml").is_empty());
+    }
+}

crates/ide-build/src/process.rs

@@ -34,6 +34,22 @@ fn kill_tree(child: &mut Child) {
     let _ = child.wait();
 }
 
+/// `program` as spawnable: a bare name (`mvn`, `mvn.cmd`) resolves on the IDE's
+/// search path — the login shell's `PATH` plus version-manager shims — since the
+/// app's own `PATH` can be minimal and `Command` would not see `mvn` there.
+pub(crate) fn program_path(program: &str, env: &BTreeMap<String, String>) -> std::path::PathBuf {
+    let path = std::path::Path::new(program);
+    if !path.is_relative() || path.components().count() > 1 {
+        return path.to_path_buf();
+    }
+    let search = env
+        .iter()
+        .find(|(k, _)| k.eq_ignore_ascii_case("PATH"))
+        .map(|(_, v)| std::ffi::OsString::from(v))
+        .unwrap_or_else(ide_core::tool_path::search_path);
+    ide_core::process::find_executable(program, &search).unwrap_or_else(|| path.to_path_buf())
+}
+
 /// Runs `program args` in `cwd`, feeding each output line to `on_line`; kills
 /// the process group and returns `cancelled` when `cancel` fires.
 pub(crate) fn run(
@@ -42,23 +58,39 @@ pub(crate) fn run(
     cwd: &Path,
     env: &BTreeMap<String, String>,
     cancel: &CancellationToken,
+    on_line: impl FnMut(Stream, &str),
+) -> IdeResult<Output> {
+    run_with_env(program, args, cwd, env, false, cancel, on_line)
+}
+
+pub(crate) fn run_with_env(
+    program: &str,
+    args: &[String],
+    cwd: &Path,
+    env: &BTreeMap<String, String>,
+    clear_env: bool,
+    cancel: &CancellationToken,
     mut on_line: impl FnMut(Stream, &str),
 ) -> IdeResult<Output> {
     tracing::info!("build: {program} {} (in {})", args.join(" "), cwd.display());
-    let mut command = Command::new(program);
-    command.args(args).current_dir(cwd).envs(env).stdin(Stdio::null()).stdout(Stdio::piped()).stderr(Stdio::piped());
+    // Output is read as UTF-8: JVMs on Windows are told to write it (see `ide_core::output_encoding`).
+    let encoding =
+        ide_core::output_encoding::fix(program, args, env, |k| std::env::var(k).ok(), "UTF-8", cfg!(windows));
+    let program = program_path(program, env);
+    let mut command = Command::new(&program);
+    command.args(args).current_dir(cwd).envs(env).envs(encoding.env.iter().map(|(k, v)| (k, v))).stdin(Stdio::null());
+    command.stdout(Stdio::piped()).stderr(Stdio::piped());
     #[cfg(unix)]
     {
         use std::os::unix::process::CommandExt;
         command.process_group(0);
     }
-    #[cfg(windows)]
-    {
-        use std::os::windows::process::CommandExt;
-        const CREATE_NO_WINDOW: u32 = 0x0800_0000;
-        command.creation_flags(CREATE_NO_WINDOW);
+    ide_core::process::prepare(&mut command);
+    if clear_env {
+        command.env_clear().envs(env).envs(encoding.env);
     }
-    let mut child = command.spawn().map_err(|e| IdeError::unavailable(format!("cannot start {program}: {e}")))?;
+    let mut child =
+        command.spawn().map_err(|e| IdeError::unavailable(format!("cannot start {}: {e}", program.display())))?;
     let (tx, rx) = mpsc::channel::<(Stream, String)>();
     let pump = |stream: Box<dyn Read + Send>, kind: Stream, tx: mpsc::Sender<(Stream, String)>| {
         std::thread::spawn(move || {
@@ -69,7 +101,7 @@ pub(crate) fn run(
                 match reader.read_until(b'\n', &mut buf) {
                     Ok(0) | Err(_) => break,
                     Ok(_) => {
-                        let line = String::from_utf8_lossy(&buf);
+                        let line = ide_core::output_encoding::decode_tool_output(&buf);
                         let line = line.trim_end_matches(['\n', '\r']).to_owned();
                         if tx.send((kind, line)).is_err() {
                             break;
@@ -91,6 +123,7 @@ pub(crate) fn run(
             return Err(IdeError::cancelled());
         }
         match rx.recv_timeout(Duration::from_millis(100)) {
+            Ok((_, line)) if encoding.notice.as_ref() == Some(&line) => {}
             Ok((stream, line)) => {
                 on_line(stream, &line);
                 text.push_str(&line);

crates/ide-build/src/sync.rs

@@ -1,5 +1,5 @@
 //! Reading the effective build from Maven / Gradle itself ("Reload" in the tool
-//! windows): `mvn help:effective-pom dependency:tree` and `gradle tasks --all`,
+//! windows): `mvn help:effective-pom dependency:tree -Dverbose` and `gradle tasks --all`,
 //! run in the background with progress and cancellation. Results are cached
 //! per project (`maven.json`, `gradle.json` in the cache directory) and merged
 //! into the static model by [`crate::load`]; a changed build file marks them stale.
@@ -23,12 +23,19 @@ pub struct SyncProgress {
 
 #[derive(Clone, Debug, Default)]
 pub struct SyncOptions {
+    pub maven_settings: ide_core::settings::MavenSettings,
     /// `-o` / `--offline`.
     pub offline: bool,
     /// Maven profiles (`-P`), `!id` deactivates.
     pub profiles: Vec<String>,
     /// Extra environment (`JAVA_HOME`).
     pub env: BTreeMap<String, String>,
+    /// Maven launcher replacing the project's `mvnw` / `mvn` (Settings › Maven home).
+    pub maven_command: Option<String>,
+    /// Resolved Gradle launcher from Settings.
+    pub gradle_command: Option<String>,
+    /// Maven options before the goals (`-s`, `-Dmaven.repo.local=`).
+    pub maven_options: Vec<String>,
 }
 
 #[derive(Clone, Debug, Default, Serialize, Deserialize)]
@@ -45,6 +52,9 @@ struct MavenCache {
     at_ms: f64,
     error: Option<String>,
     projects: Vec<CachedMavenProject>,
+    /// The trees list omitted occurrences (`-Dverbose`); older caches are reloaded.
+    #[serde(default)]
+    verbose: bool,
 }
 
 #[derive(Clone, Debug, Default, Serialize, Deserialize)]
@@ -56,6 +66,21 @@ struct GradleCache {
 }
 
 const MAVEN_CACHE: &str = "maven.json";
+
+/// `dependency:tree` of a plugin version whose `-Dverbose` lists the occurrences Maven
+/// omitted (conflicts, duplicates): verbose output was dropped in 3.0 and is back since 3.2.
+/// Offline, the project's own plugin version is used instead, since this one may not be cached.
+const DEPENDENCY_TREE: &str = "org.apache.maven.plugins:maven-dependency-plugin:3.8.1:tree";
+
+/// The goals that read the effective POM into `effective` and the verbose dependency trees.
+fn maven_sync_goals(effective: &Path, offline: bool) -> Vec<String> {
+    vec![
+        "help:effective-pom".into(),
+        format!("-Doutput={}", effective.to_string_lossy()),
+        if offline { "dependency:tree".into() } else { DEPENDENCY_TREE.into() },
+        "-Dverbose".into(),
+    ]
+}
 const GRADLE_CACHE: &str = "gradle.json";
 
 fn read_cache<T: DeserializeOwned>(dir: &Path, name: &str) -> Option<T> {
@@ -96,6 +121,16 @@ fn now_ms() -> f64 {
 /// Merges the cached effective build into `model`.
 pub fn apply_maven_cache(root: &Path, cache_dir: &Path, model: &mut MavenModel) {
     let Some(cache) = read_cache::<MavenCache>(cache_dir, MAVEN_CACHE) else { return };
+    model.synced_at = Some(cache.at_ms);
+    model.sync_error = cache.error;
+    let changed = cache.hash != hash_files(&maven::build_files(root, model));
+    model.stale = !cache.verbose || changed;
+    // A cache older than the current build files: its effective-POM plugins and
+    // resolved dependencies would hide what the POMs declare now (a just added
+    // dependency never appears). The static parse stays until Reload.
+    if changed {
+        return;
+    }
     for p in &mut model.projects {
         if let Some(c) = cache.projects.iter().find(|c| c.key == p.key()) {
             if !c.plugins.is_empty() {
@@ -104,9 +139,6 @@ pub fn apply_maven_cache(root: &Path, cache_dir: &Path, model: &mut MavenModel)
             p.dependencies = c.dependencies.clone();
         }
     }
-    model.synced_at = Some(cache.at_ms);
-    model.sync_error = cache.error;
-    model.stale = cache.hash != hash_files(&maven::build_files(root, model));
 }
 
 /// Merges the cached task list into `model`.
@@ -176,25 +208,27 @@ pub fn sync_maven(
     cancel: &CancellationToken,
     progress: &dyn Fn(SyncProgress),
 ) -> IdeResult<()> {
-    let model = maven::load(root);
+    let mut model = maven::load(root);
+    maven::UnlinkedProjects::from_model(&model, &options.maven_settings).filter(&mut model);
     std::fs::create_dir_all(cache_dir)?;
-    let mut cache = MavenCache { hash: hash_files(&maven::build_files(root, &model)), ..MavenCache::default() };
+    let mut cache =
+        MavenCache { hash: hash_files(&maven::build_files(root, &model)), verbose: true, ..MavenCache::default() };
     let mut errors: Vec<String> = Vec::new();
     for (n, top) in model.projects.iter().filter(|p| !p.aggregated).enumerate() {
         let effective = cache_dir.join(format!("effective-pom-{n}.xml"));
         let _ = std::fs::remove_file(&effective);
         let mut args: Vec<String> = vec!["-B".into(), "-fae".into(), "-Dstyle.color=never".into()];
+        args.extend(options.maven_options.iter().cloned());
         if options.offline {
             args.push("-o".into());
         }
         if !options.profiles.is_empty() {
             args.push(format!("-P{}", options.profiles.join(",")));
         }
-        args.push("help:effective-pom".into());
-        args.push(format!("-Doutput={}", effective.to_string_lossy()));
-        args.push("dependency:tree".into());
+        args.extend(maven_sync_goals(&effective, options.offline));
         progress(SyncProgress { message: format!("Reading {}", top.display_name), fraction: None });
-        let out = run(&top.command, &args, &root.join(&top.dir), &options.env, cancel, |line| {
+        let command = options.maven_command.as_deref().unwrap_or(&top.command);
+        let out = run(command, &args, &root.join(&top.dir), &options.env, cancel, |line| {
             if let Some((name, i, total)) = maven_building(line) {
                 let fraction = (i.saturating_sub(1) as f32 / total.max(1) as f32).min(1.0);
                 progress(SyncProgress { message: format!("Building model of {name}"), fraction: Some(fraction) });
@@ -243,7 +277,14 @@ pub fn sync_gradle(
         args.push("--offline".into());
     }
     progress(SyncProgress { message: "Loading Gradle tasks".into(), fraction: None });
-    let out = run(&model.command, &args, &root.join(&model.dir), &options.env, cancel, |_| {})?;
+    let out = run(
+        options.gradle_command.as_deref().unwrap_or(&model.command),
+        &args,
+        &root.join(&model.dir),
+        &options.env,
+        cancel,
+        |_| {},
+    )?;
     let cache = GradleCache {
         hash: hash_files(&gradle::build_files(root, &model)),
         at_ms: now_ms(),
@@ -257,6 +298,29 @@ pub fn sync_gradle(
 mod tests {
     use super::*;
 
+    #[cfg(unix)]
+    #[test]
+    fn gradle_sync_uses_resolved_command_and_environment() {
+        use std::os::unix::fs::PermissionsExt;
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path();
+        std::fs::write(root.join("build.gradle"), "").unwrap();
+        let launcher = root.join("configured-gradle");
+        std::fs::write(&launcher, "#!/bin/sh\nprintf '%s\\n' \"$JAVA_HOME\" \"$GRADLE_USER_HOME\" > actual-env\n")
+            .unwrap();
+        std::fs::set_permissions(&launcher, std::fs::Permissions::from_mode(0o755)).unwrap();
+        let options = SyncOptions {
+            gradle_command: Some(launcher.to_string_lossy().into_owned()),
+            env: BTreeMap::from([
+                ("JAVA_HOME".into(), "/jdk21".into()),
+                ("GRADLE_USER_HOME".into(), "/gradle-cache".into()),
+            ]),
+            ..Default::default()
+        };
+        sync_gradle(root, &root.join("cache"), &options, &CancellationToken::new(), &|_| {}).unwrap();
+        assert_eq!(std::fs::read_to_string(root.join("actual-env")).unwrap(), "/jdk21\n/gradle-cache\n");
+    }
+
     #[test]
     fn caches_merge_and_go_stale() {
         let tmp = tempfile::tempdir().unwrap();
@@ -271,6 +335,7 @@ mod tests {
             hash: hash_files(&maven::build_files(&root, &model)),
             at_ms: 5.0,
             error: None,
+            verbose: true,
             projects: vec![CachedMavenProject {
                 key: "g:a".into(),
                 plugins: vec![maven::plugin(
@@ -291,12 +356,16 @@ mod tests {
 
         std::fs::write(
             root.join("pom.xml"),
-            "<project><groupId>g</groupId><artifactId>a</artifactId><version>2</version></project>",
+            "<project><groupId>g</groupId><artifactId>a</artifactId><version>2</version>\
+             <dependencies><dependency><groupId>g</groupId><artifactId>fresh</artifactId><version>1</version></dependency></dependencies>\
+             </project>",
         )
         .unwrap();
         let mut model = maven::load_with_repo(&root, None);
         apply_maven_cache(&root, &cache_dir, &mut model);
         assert!(model.stale);
+        // The POM changed: the stale effective dependencies must not hide the new one (#249).
+        assert_eq!(model.projects[0].dependencies[0].artifact_id, "fresh");
     }
 
     #[test]
@@ -321,6 +390,25 @@ mod tests {
         assert!(!model.stale);
     }
 
+    #[test]
+    fn sync_reads_verbose_trees_with_a_pinned_plugin_unless_offline() {
+        let online = maven_sync_goals(Path::new("e.xml"), false);
+        assert_eq!(online, ["help:effective-pom", "-Doutput=e.xml", DEPENDENCY_TREE, "-Dverbose"]);
+        let offline = maven_sync_goals(Path::new("e.xml"), true);
+        assert_eq!(offline[2], "dependency:tree");
+        assert!(offline.contains(&"-Dverbose".to_owned()));
+    }
+
+    #[test]
+    fn cache_written_before_omissions_existed_still_loads() {
+        let json = r#"{"hash":"x","at_ms":1.0,"error":null,"projects":[{"key":"g:a","plugins":[],
+            "dependencies":[{"groupId":"g","artifactId":"d","version":"1","type":"jar","classifier":null,
+            "scope":"compile","optional":false,"children":[]}]}]}"#;
+        let cache: MavenCache = serde_json::from_str(json).unwrap();
+        assert!(cache.projects[0].dependencies[0].resolved());
+        assert!(!cache.verbose, "reloaded to read the omitted occurrences");
+    }
+
     #[test]
     fn progress_and_error_lines() {
         assert_eq!(

crates/ide-build/src/web.rs

@@ -0,0 +1,268 @@
+//! WAR modules and build-tool-owned archive resolution (including custom output names).
+use crate::BuildModel;
+use ide_core::{CancellationToken, IdeError, IdeResult};
+use serde::{Deserialize, Serialize};
+use specta::Type;
+use std::{collections::BTreeMap, fs, path::Path};
+
+#[derive(Clone, Debug, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct WebArtifact {
+    pub id: String,
+    pub name: String,
+    pub module: String,
+    pub tool: String,
+}
+
+pub fn artifacts(root: &Path, model: &BuildModel) -> Vec<WebArtifact> {
+    let mut out = Vec::new();
+    if let Some(maven) = &model.maven {
+        for p in maven.projects.iter().filter(|p| p.packaging == "war") {
+            out.push(WebArtifact {
+                id: format!("maven:{}", p.pom),
+                name: p.artifact_id.clone(),
+                module: p.dir.clone(),
+                tool: "maven".into(),
+            });
+        }
+    }
+    if let Some(gradle) = &model.gradle {
+        for p in &gradle.projects {
+            let script = p.build_file.as_ref().and_then(|f| fs::read_to_string(root.join(f)).ok()).unwrap_or_default();
+            if p.tasks.iter().any(|t| t.name == "war") || crate::gradle::has_war_plugin(&script) {
+                out.push(WebArtifact {
+                    id: format!("gradle:{}", p.path),
+                    name: p.name.clone(),
+                    module: p.dir.clone(),
+                    tool: "gradle".into(),
+                });
+            }
+        }
+    }
+    out
+}
+
+pub struct WebBuild {
+    pub command: String,
+    pub args: Vec<String>,
+    pub cwd: String,
+    pub env: BTreeMap<String, String>,
+    maven_project: Option<(Vec<String>, std::path::PathBuf)>,
+}
+
+impl WebBuild {
+    /// Resolve the selected module's effective identity using the build's options and environment.
+    /// Runs off the UI thread, before launching the reactor build.
+    pub fn resolve_project(
+        &mut self,
+        root: &Path,
+        env: &BTreeMap<String, String>,
+        cancel: &CancellationToken,
+    ) -> IdeResult<()> {
+        let Some((args, output)) = &self.maven_project else {
+            return Ok(());
+        };
+        if output.exists() {
+            fs::remove_file(output)?;
+        }
+        let cwd = root.join(&self.cwd).canonicalize()?;
+        let mut env = env.clone();
+        if !env.iter().any(|(k, v)| k.eq_ignore_ascii_case("MAVEN_BASEDIR") && !v.is_empty()) {
+            // -f changes Maven's .mvn search origin; keep the reactor's launcher settings.
+            let base = cwd.ancestors().find(|p| p.join(".mvn").is_dir()).unwrap_or(&cwd);
+            env.retain(|k, _| !k.eq_ignore_ascii_case("MAVEN_BASEDIR"));
+            env.insert("MAVEN_BASEDIR".into(), base.to_string_lossy().into_owned());
+        }
+        let result = crate::process::run_with_env(&self.command, args, &cwd, &env, true, cancel, |_, _| {})?;
+        if !result.success {
+            return Err(IdeError::invalid(format!("Cannot resolve Maven WAR artifact: {}", result.text.trim())));
+        }
+        let id = fs::read_to_string(output)?;
+        let parts: Vec<_> = id.trim().split(':').collect();
+        if parts.len() != 4 || parts[2] != "war" || parts.iter().any(|s| s.is_empty()) {
+            return Err(IdeError::invalid(format!("Cannot resolve Maven WAR artifact: {}", id.trim())));
+        }
+        let project = format!("{}:{}:{}", parts[0], parts[1], parts[3]);
+        self.args.push(format!("-Dexpression=session.projectMap({project}).artifact.file"));
+        self.maven_project = None;
+        Ok(())
+    }
+}
+
+fn groovy_literal(s: &str) -> String {
+    format!("'{}'", s.replace('\\', "\\\\").replace('\'', "\\'"))
+}
+
+pub fn build(root: &Path, model: &BuildModel, id: &str, cache: &Path) -> IdeResult<WebBuild> {
+    fs::create_dir_all(cache)?;
+    let manifest = cache.join("artifact-path.txt");
+    // A failed build must never silently reuse an older archive manifest.
+    if manifest.exists() {
+        fs::remove_file(&manifest)?;
+    }
+    fs::write(cache.join("artifact-id.txt"), id)?;
+    if let Some(pom) = id.strip_prefix("maven:") {
+        let p = model
+            .maven
+            .as_ref()
+            .and_then(|m| m.projects.iter().find(|p| p.pom == pom && p.packaging == "war"))
+            .ok_or_else(|| IdeError::invalid("Choose a Maven WAR module"))?;
+        let projects = &model.maven.as_ref().unwrap().projects;
+        let top = projects
+            .iter()
+            .filter(|t| {
+                !t.aggregated && (t.dir.is_empty() || p.dir == t.dir || p.dir.starts_with(&format!("{}/", t.dir)))
+            })
+            .max_by_key(|t| t.dir.len())
+            .unwrap_or(p);
+        let mut args = top.options.clone();
+        if top.pom != p.pom {
+            let module = root
+                .join(&p.dir)
+                .strip_prefix(root.join(&top.dir))
+                .map_err(|e| IdeError::invalid(e.to_string()))?
+                .to_string_lossy()
+                .replace('\\', "/");
+            args.extend(["-pl".into(), module, "-am".into()]);
+        }
+        // help:evaluate runs once, in the reactor's first project. Query the selected
+        // POM's effective identity first; profiles and -D options can change its GAV.
+        let output = cache.join("artifact-project.txt");
+        let mut probe = top.options.clone();
+        probe.extend([
+            "-f".into(),
+            root.join(&p.pom).to_string_lossy().into_owned(),
+            "help:evaluate".into(),
+            "-Dexpression=project.id".into(),
+            format!("-Doutput={}", output.display()),
+        ]);
+        args.extend([
+            "-DskipTests".into(),
+            "package".into(),
+            "help:evaluate".into(),
+            format!("-Doutput={}", manifest.display()),
+        ]);
+        return Ok(WebBuild {
+            command: top.command.clone(),
+            args,
+            cwd: top.dir.clone(),
+            env: p.env.clone(),
+            maven_project: Some((probe, output)),
+        });
+    }
+    if let Some(path) = id.strip_prefix("gradle:") {
+        let g = model.gradle.as_ref().ok_or_else(|| IdeError::invalid("Choose a Gradle WAR module"))?;
+        if !artifacts(root, model).iter().any(|a| a.id == id) {
+            return Err(IdeError::invalid("Choose a Gradle WAR module"));
+        }
+        let script = cache.join("war.init.gradle");
+        fs::write(
+            &script,
+            format!(
+                r#"gradle.projectsEvaluated {{
+    def p = gradle.rootProject.project({})
+    def warTask = p.tasks.named('war')
+    p.tasks.register('openideaTomcatArtifact') {{
+        dependsOn warTask
+        doLast {{ new File({}).setText(warTask.get().archiveFile.get().asFile.absolutePath, 'UTF-8') }}
+    }}
+}}
+"#,
+                groovy_literal(path),
+                groovy_literal(&manifest.to_string_lossy())
+            ),
+        )?;
+        let task = format!("{}:openideaTomcatArtifact", path.trim_end_matches(':'));
+        return Ok(WebBuild {
+            command: g.command.clone(),
+            args: vec!["--init-script".into(), script.to_string_lossy().into_owned(), task],
+            cwd: g.dir.clone(),
+            env: g.env.clone(),
+            maven_project: None,
+        });
+    }
+    Err(IdeError::invalid("Choose a WAR artifact"))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn maven_war_modules_use_resolved_artifact_file() {
+        let tmp = tempfile::tempdir().unwrap();
+        fs::write(tmp.path().join("pom.xml"), "<project><modelVersion>4.0.0</modelVersion><groupId>test</groupId><artifactId>web</artifactId><version>1</version><packaging>war</packaging><build><directory>custom</directory><finalName>renamed</finalName></build></project>").unwrap();
+        let model = crate::load(tmp.path(), &tmp.path().join("cache"), None);
+        let a = artifacts(tmp.path(), &model);
+        assert_eq!(a.len(), 1);
+        assert_eq!(a[0].name, "web");
+        let plan = build(tmp.path(), &model, &a[0].id, &tmp.path().join("base with spaces")).unwrap();
+        let (probe, _) = plan.maven_project.as_ref().unwrap();
+        assert!(probe.contains(&"-Dexpression=project.id".into()));
+        assert!(probe.contains(&tmp.path().join("pom.xml").to_string_lossy().into_owned()));
+        assert!(
+            plan.args.iter().any(|a| a.ends_with("base with spaces/artifact-path.txt")
+                || a.ends_with("base with spaces\\artifact-path.txt"))
+        );
+    }
+    #[test]
+    fn maven_module_build_includes_reactor_dependencies() {
+        let tmp = tempfile::tempdir().unwrap();
+        fs::create_dir_all(tmp.path().join("web")).unwrap();
+        fs::write(tmp.path().join("pom.xml"), "<project><groupId>test</groupId><artifactId>parent</artifactId><version>1</version><packaging>pom</packaging><modules><module>web</module></modules></project>").unwrap();
+        fs::write(tmp.path().join("web/pom.xml"), "<project><parent><groupId>test</groupId><artifactId>parent</artifactId><version>1</version></parent><artifactId>web</artifactId><packaging>war</packaging></project>").unwrap();
+        let model = crate::load(tmp.path(), &tmp.path().join("cache"), None);
+        let plan = build(tmp.path(), &model, "maven:web/pom.xml", &tmp.path().join("base")).unwrap();
+        assert_eq!(plan.cwd, "");
+        assert_eq!(&plan.args[..3], &["-pl", "web", "-am"]);
+        assert!(
+            plan.maven_project
+                .as_ref()
+                .unwrap()
+                .0
+                .contains(&tmp.path().join("web/pom.xml").to_string_lossy().into_owned())
+        );
+    }
+    #[test]
+    fn gradle_war_uses_archive_provider_and_ignores_comments() {
+        let tmp = tempfile::tempdir().unwrap();
+        fs::write(
+            tmp.path().join("build.gradle.kts"),
+            "plugins { war }\ntasks.war { archiveFileName.set(\"custom.war\") }",
+        )
+        .unwrap();
+        let model = crate::load(tmp.path(), &tmp.path().join("cache"), None);
+        let a = artifacts(tmp.path(), &model);
+        assert_eq!(a.len(), 1);
+        let plan = build(tmp.path(), &model, &a[0].id, &tmp.path().join("base")).unwrap();
+        assert!(plan.args.contains(&":openideaTomcatArtifact".into()));
+        assert!(fs::read_to_string(tmp.path().join("base/war.init.gradle")).unwrap().contains("archiveFile.get()"));
+        assert!(!crate::gradle::has_war_plugin("// plugins { war }"));
+    }
+
+    #[test]
+    fn gradle_manifest_paths_preserve_windows_characters() {
+        for path in [r"C:\工作 区\Tomcat's cache\artifact-path.txt", r"\\server\share\artifact-path.txt"] {
+            let literal = groovy_literal(path);
+            assert_eq!(literal[1..literal.len() - 1].replace("\\'", "'").replace("\\\\", "\\"), path);
+        }
+    }
+
+    #[test]
+    fn gradle_root_and_nested_modules_write_utf8_archive_paths() {
+        for module in [":", ":apps:timesheet"] {
+            let tmp = tempfile::tempdir().unwrap();
+            let dir = if module == ":" { "" } else { "apps/timesheet" };
+            fs::create_dir_all(tmp.path().join(dir)).unwrap();
+            fs::write(tmp.path().join("settings.gradle"), "rootProject.name = 'timesheet'\ninclude 'apps:timesheet'")
+                .unwrap();
+            fs::write(tmp.path().join(dir).join("build.gradle"), "plugins { id 'war' }").unwrap();
+            let model = crate::load(tmp.path(), &tmp.path().join("cache"), None);
+            let cache = tmp.path().join("工作 cache");
+            let plan = build(tmp.path(), &model, &format!("gradle:{module}"), &cache).unwrap();
+            assert!(plan.args.contains(&format!("{}:openideaTomcatArtifact", module.trim_end_matches(':'))));
+            let script = fs::read_to_string(cache.join("war.init.gradle")).unwrap();
+            assert!(script.contains(&format!("rootProject.project('{}')", module)));
+            assert!(script.contains("archiveFile.get().asFile.absolutePath, 'UTF-8'"));
+        }
+    }
+}

crates/ide-build/src/xml.rs

@@ -1,12 +1,19 @@
 //! A small, forgiving XML element reader for POM files: elements, text and
 //! CDATA; attributes, comments, processing instructions and DOCTYPEs are
 //! skipped. Namespace prefixes are dropped (`<x:project>` → `project`).
+//! Elements keep their byte offsets in the source, for edits ([`crate::pom_edit`]).
 
 #[derive(Clone, Debug, Default, PartialEq, Eq)]
 pub struct Element {
     pub name: String,
     pub text: String,
     pub children: Vec<Element>,
+    /// Byte offset of the start tag's `<`.
+    pub start: usize,
+    /// Byte offset of the end tag's `<` (`end` for an empty or unclosed element).
+    pub inner_end: usize,
+    /// Byte offset just past the end tag (past the start tag for `<empty/>`).
+    pub end: usize,
 }
 
 impl Element {
@@ -76,6 +83,7 @@ fn local(name: &str) -> String {
 pub fn parse(text: &str) -> Option<Element> {
     let mut stack: Vec<Element> = vec![Element::default()];
     let mut rest = text;
+    let at = |rest: &str| text.len() - rest.len();
     while !rest.is_empty() {
         let Some(lt) = rest.find('<') else {
             decode_entities(rest, &mut stack.last_mut()?.text);
@@ -98,13 +106,19 @@ pub fn parse(text: &str) -> Option<Element> {
         } else if let Some(body) = tag.strip_prefix("</") {
             let end = body.find('>').unwrap_or(body.len());
             let name = local(body[..end].trim());
-            if let Some(at) = stack.iter().rposition(|e| e.name == name).filter(|&i| i > 0) {
-                while stack.len() > at {
-                    let done = stack.pop()?;
+            let close_start = at(tag);
+            rest = body.get(end + 1..).unwrap_or("");
+            let close_end = at(rest);
+            if let Some(i) = stack.iter().rposition(|e| e.name == name).filter(|&i| i > 0) {
+                while stack.len() > i {
+                    let mut done = stack.pop()?;
+                    // Elements closed implicitly by an outer end tag end where it starts.
+                    let matched = stack.len() == i;
+                    done.inner_end = close_start;
+                    done.end = if matched { close_end } else { close_start };
                     stack.last_mut()?.children.push(done);
                 }
             }
-            rest = body.get(end + 1..).unwrap_or("");
         } else {
             // Start or empty tag; skip quoted attribute values when looking for `>`.
             let bytes = tag.as_bytes();
@@ -124,17 +138,22 @@ pub fn parse(text: &str) -> Option<Element> {
             let empty = inner.ends_with('/');
             let inner = inner.trim_end_matches('/');
             let name_end = inner.find(|c: char| c.is_whitespace()).unwrap_or(inner.len());
-            let el = Element { name: local(&inner[..name_end]), ..Element::default() };
+            let start = at(tag);
+            rest = tag.get(i + 1..).unwrap_or("");
+            let after = at(rest);
+            let el =
+                Element { name: local(&inner[..name_end]), start, inner_end: after, end: after, ..Element::default() };
             if empty {
                 stack.last_mut()?.children.push(el);
             } else {
                 stack.push(el);
             }
-            rest = tag.get(i + 1..).unwrap_or("");
         }
     }
     while stack.len() > 1 {
-        let done = stack.pop()?;
+        let mut done = stack.pop()?;
+        done.inner_end = text.len();
+        done.end = text.len();
         stack.last_mut()?.children.push(done);
     }
     stack.pop()?.children.into_iter().next()
@@ -167,6 +186,22 @@ mod tests {
         assert_eq!(root.children_named("name").count(), 1);
     }
 
+    #[test]
+    fn element_offsets() {
+        let doc = "<a>\n  <b>x</b><c/>\n</a>";
+        let root = parse(doc).unwrap();
+        assert_eq!((root.start, root.inner_end, root.end), (0, doc.len() - 4, doc.len()));
+        let b = root.child("b").unwrap();
+        assert_eq!(&doc[b.start..b.end], "<b>x</b>");
+        assert_eq!(&doc[b.start..b.inner_end], "<b>x");
+        let c = root.child("c").unwrap();
+        assert_eq!(&doc[c.start..c.end], "<c/>");
+        let broken = parse("<a><b>x</a>").unwrap();
+        let b = broken.child("b").unwrap();
+        assert_eq!((b.inner_end, b.end), (7, 7));
+        assert_eq!(broken.end, 11);
+    }
+
     #[test]
     fn tolerates_broken_documents() {
         let root = parse("<a><b>x</c><d>y").unwrap();

crates/ide-build/testdata/dependency-tree-verbose.txt

@@ -0,0 +1,24 @@
+[INFO] --- dependency:3.8.1:tree (default-cli) @ conflict-demo ---
+[INFO] demo:conflict-demo:jar:1.0-SNAPSHOT
+[INFO] +- org.hamcrest:hamcrest-core:jar:1.3:compile
+[INFO] +- org.apache.commons:commons-text:jar:1.10.0:compile
+[INFO] |  \- org.apache.commons:commons-lang3:jar:3.12.0:compile
+[INFO] +- org.apache.commons:commons-configuration2:jar:2.10.1:compile
+[INFO] |  +- (org.apache.commons:commons-lang3:jar:3.14.0:compile - omitted for conflict with 3.12.0)
+[INFO] |  +- (org.apache.commons:commons-text:jar:1.11.0:compile - omitted for conflict with 1.10.0)
+[INFO] |  \- commons-logging:commons-logging:jar:1.2:compile (version managed from 1.3.0)
+[INFO] +- com.google.guava:guava:jar:32.1.3-jre:compile
+[INFO] |  +- com.google.guava:failureaccess:jar:1.0.1:compile
+[INFO] |  +- com.google.guava:listenablefuture:jar:9999.0-empty-to-avoid-conflict-with-guava:compile
+[INFO] |  +- com.google.code.findbugs:jsr305:jar:3.0.2:compile
+[INFO] |  +- org.checkerframework:checker-qual:jar:3.37.0:compile
+[INFO] |  +- com.google.errorprone:error_prone_annotations:jar:2.21.1:compile
+[INFO] |  \- com.google.j2objc:j2objc-annotations:jar:2.8:compile
+[INFO] +- com.google.inject:guice:jar:5.1.0:compile
+[INFO] |  +- javax.inject:javax.inject:jar:1:compile
+[INFO] |  +- aopalliance:aopalliance:jar:1.0:compile
+[INFO] |  \- (com.google.guava:guava:jar:30.1-jre:compile - omitted for conflict with 32.1.3-jre)
+[INFO] \- junit:junit:jar:4.13.2:test
+[INFO]    \- (org.hamcrest:hamcrest-core:jar:1.3:test - omitted for duplicate)
+[INFO] ------------------------------------------------------------------------
+[INFO] BUILD SUCCESS

crates/ide-clipboard/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "ide-clipboard"
+description = "The OS clipboard's file list (Explorer <-> project view): Windows CF_HDROP or macOS NSPasteboard file URLs, no window or message loop"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+
+[target.'cfg(target_os = "macos")'.dependencies]
+objc2 = { version = "0.6", default-features = false, features = ["std"] }
+objc2-foundation = { version = "0.3", default-features = false, features = ["std", "NSArray", "NSDictionary", "NSEnumerator", "NSObject", "NSString", "NSURL", "NSValue"] }
+objc2-app-kit = { version = "0.3", default-features = false, features = ["std", "NSPasteboard"] }

crates/ide-clipboard/src/lib.rs

@@ -0,0 +1,426 @@
+//! The file list on the OS clipboard: what Explorer copies when the user
+//! copies files, so the project view can paste them, and what the project view
+//! writes so Explorer can paste the files it copied (IDEA does both). The
+//! written list comes with the paths as text, so a paste into an editor
+//! inserts them instead of doing nothing.
+//!
+//! Windows keeps it as `CF_HDROP`: a `DROPFILES` header and a double-NUL
+//! terminated list of absolute paths, wide when `fWide` is set. The data is set
+//! in full rather than rendered on demand, so no window or message loop is
+//! needed and the list survives after `CloseClipboard`.
+//!
+//! macOS keeps one `public.file-url` item per file on the general
+//! `NSPasteboard`; `NSURL` reads and writes them, so Finder's copies paste here
+//! and ours paste in Finder.
+//! On macOS, [`files`], [`has_files`] and [`set_files`] must run on the main
+//! thread: AppKit and WebKit also access the general pasteboard there, and its
+//! mutable type cache cannot be protected by a mutex in this crate.
+//!
+//! Other platforms (`text/uri-list` on X11) are not wired up: [`files`] is
+//! empty and [`set_files`] fails there.
+
+use std::path::PathBuf;
+
+/// Size of `DROPFILES`: `pFiles`, `pt` (two `LONG`s), `fNC`, `fWide`.
+const HEADER: usize = 20;
+
+/// The absolute paths on the clipboard, empty when it holds no file list.
+/// Read failures remain errors so callers can retain an internal copy.
+pub fn files() -> std::io::Result<Vec<PathBuf>> {
+    imp::files()
+}
+
+/// Whether the clipboard holds a file list, without reading it.
+pub fn has_files() -> bool {
+    imp::has_files()
+}
+
+/// Replaces the clipboard with `paths`. True only when the file list was
+/// accepted; writing just the accompanying text is not a successful hand-off.
+pub fn set_files(paths: &[PathBuf]) -> bool {
+    if paths.is_empty() {
+        return false;
+    }
+    imp::set_files(paths)
+}
+
+/// `DROPFILES` for `paths`, in the wide form so names outside the ANSI code
+/// page survive. Empty paths are skipped.
+pub fn encode(paths: &[PathBuf]) -> Vec<u8> {
+    let mut units: Vec<u16> = Vec::new();
+    for path in paths {
+        let path = path.to_string_lossy();
+        if path.is_empty() {
+            continue;
+        }
+        units.extend(path.encode_utf16());
+        units.push(0);
+    }
+    // The list ends with an empty string: with one path, two NULs in a row.
+    units.push(0);
+    let mut out = Vec::with_capacity(HEADER + units.len() * 2);
+    out.extend_from_slice(&(HEADER as u32).to_le_bytes()); // pFiles: list starts after the header
+    out.extend_from_slice(&[0u8; 8]); // pt: the drop point, unused
+    out.extend_from_slice(&0u32.to_le_bytes()); // fNC: not a file manager drop
+    out.extend_from_slice(&1u32.to_le_bytes()); // fWide: UTF-16 paths
+    for unit in units {
+        out.extend_from_slice(&unit.to_le_bytes());
+    }
+    out
+}
+
+/// The paths of a `DROPFILES` block, stopping at the empty string that ends the
+/// list. An ANSI list (pre-Unicode writers) is decoded as UTF-8, lossily.
+pub fn decode(bytes: &[u8]) -> Vec<PathBuf> {
+    if bytes.len() < HEADER {
+        return Vec::new();
+    }
+    let offset = u32::from_le_bytes([bytes[0], bytes[1], bytes[2], bytes[3]]) as usize;
+    let wide = u32::from_le_bytes([bytes[16], bytes[17], bytes[18], bytes[19]]) != 0;
+    if offset >= bytes.len() {
+        return Vec::new();
+    }
+    let body = &bytes[offset..];
+    let mut out = Vec::new();
+    if wide {
+        let mut current: Vec<u16> = Vec::new();
+        for chunk in body.as_chunks::<2>().0 {
+            let unit = u16::from_le_bytes(*chunk);
+            if unit != 0 {
+                current.push(unit);
+            } else if current.is_empty() {
+                break;
+            } else {
+                out.push(PathBuf::from(String::from_utf16_lossy(&current)));
+                current.clear();
+            }
+        }
+    } else {
+        for part in body.split(|b| *b == 0) {
+            if part.is_empty() {
+                break;
+            }
+            out.push(PathBuf::from(String::from_utf8_lossy(part).into_owned()));
+        }
+    }
+    out
+}
+
+#[cfg(windows)]
+mod imp {
+    use super::{HEADER, decode, encode};
+    use std::ffi::c_void;
+    use std::path::PathBuf;
+    use std::ptr;
+    use std::time::Duration;
+
+    /// `CF_HDROP`, the clipboard format holding a file list.
+    const CF_HDROP: u32 = 15;
+    /// `CF_UNICODETEXT`, so an editor paste of copied files inserts the paths.
+    const CF_UNICODETEXT: u32 = 13;
+
+    /// An `HGLOBAL` or a `HANDLE`: both are opaque pointers here.
+    type Handle = *mut c_void;
+
+    const GMEM_MOVEABLE: u32 = 0x0002;
+    /// Another process holds the clipboard only while it copies; retrying beats
+    /// reporting "no files" for a paste the user just made.
+    const OPEN_ATTEMPTS: usize = 10;
+    const OPEN_RETRY: Duration = Duration::from_millis(20);
+
+    #[link(name = "user32")]
+    unsafe extern "system" {
+        fn OpenClipboard(owner: Handle) -> i32;
+        fn CloseClipboard() -> i32;
+        fn EmptyClipboard() -> i32;
+        fn GetClipboardData(format: u32) -> Handle;
+        fn SetClipboardData(format: u32, memory: Handle) -> Handle;
+        fn IsClipboardFormatAvailable(format: u32) -> i32;
+    }
+
+    #[link(name = "kernel32")]
+    unsafe extern "system" {
+        fn GlobalAlloc(flags: u32, bytes: usize) -> Handle;
+        fn GlobalLock(memory: Handle) -> *mut c_void;
+        fn GlobalUnlock(memory: Handle) -> i32;
+        fn GlobalFree(memory: Handle) -> Handle;
+        fn GlobalSize(memory: Handle) -> usize;
+    }
+
+    /// Opens the clipboard as its owner: the list is written in full, so no
+    /// owning window is needed.
+    fn open() -> bool {
+        for _ in 0..OPEN_ATTEMPTS {
+            if unsafe { OpenClipboard(ptr::null_mut()) } != 0 {
+                return true;
+            }
+            std::thread::sleep(OPEN_RETRY);
+        }
+        false
+    }
+
+    pub fn has_files() -> bool {
+        (unsafe { IsClipboardFormatAvailable(CF_HDROP) }) != 0
+    }
+
+    pub fn files() -> std::io::Result<Vec<PathBuf>> {
+        if !open() {
+            return Err(std::io::Error::last_os_error());
+        }
+        if !has_files() {
+            unsafe { CloseClipboard() };
+            return Ok(Vec::new());
+        }
+        let memory = unsafe { GetClipboardData(CF_HDROP) };
+        let paths = if memory.is_null() {
+            Err(std::io::Error::last_os_error())
+        } else {
+            // SAFETY: the clipboard keeps the block alive while it is open, and
+            // `GlobalSize` bounds the bytes read from it.
+            unsafe {
+                let data = GlobalLock(memory);
+                if data.is_null() {
+                    Err(std::io::Error::last_os_error())
+                } else {
+                    let bytes = std::slice::from_raw_parts(data as *const u8, GlobalSize(memory));
+                    let paths = decode(bytes);
+                    GlobalUnlock(memory);
+                    Ok(paths)
+                }
+            }
+        };
+        unsafe { CloseClipboard() };
+        paths
+    }
+
+    /// An `HGLOBAL` holding `text` as UTF-16 with a terminating NUL, and its
+    /// byte size. Null when the allocation failed.
+    fn global_text(text: &str) -> (Handle, usize) {
+        let mut units: Vec<u16> = text.encode_utf16().collect();
+        units.push(0);
+        let bytes = units.len() * 2;
+        unsafe {
+            let memory = GlobalAlloc(GMEM_MOVEABLE, bytes);
+            if memory.is_null() {
+                return (ptr::null_mut(), 0);
+            }
+            let data = GlobalLock(memory);
+            if data.is_null() {
+                GlobalFree(memory);
+                return (ptr::null_mut(), 0);
+            }
+            ptr::copy_nonoverlapping(units.as_ptr() as *const u8, data as *mut u8, bytes);
+            GlobalUnlock(memory);
+            (memory, bytes)
+        }
+    }
+
+    pub fn set_files(paths: &[PathBuf]) -> bool {
+        let bytes = encode(paths);
+        if bytes.len() <= HEADER {
+            return false;
+        }
+        // The paths as text, newline-separated, so pasting into an editor
+        // inserts them (IDEA writes the list and the text together).
+        let text = paths.iter().map(|p| p.to_string_lossy().into_owned()).collect::<Vec<_>>().join("\r\n");
+        // SAFETY: the blocks are allocated, filled, handed to the clipboard and
+        // freed only on the paths where the clipboard did not take ownership.
+        unsafe {
+            let memory = GlobalAlloc(GMEM_MOVEABLE, bytes.len());
+            if memory.is_null() {
+                return false;
+            }
+            let data = GlobalLock(memory);
+            if data.is_null() {
+                GlobalFree(memory);
+                return false;
+            }
+            ptr::copy_nonoverlapping(bytes.as_ptr(), data as *mut u8, bytes.len());
+            GlobalUnlock(memory);
+            if !open() {
+                GlobalFree(memory);
+                return false;
+            }
+            // Replacing the list also drops the text the user copied before;
+            // the paths' own text is set back with it.
+            if EmptyClipboard() == 0 {
+                CloseClipboard();
+                GlobalFree(memory);
+                return false;
+            }
+            let taken = !SetClipboardData(CF_HDROP, memory).is_null();
+            if !taken {
+                GlobalFree(memory);
+            }
+            let (text_memory, _) = global_text(&text);
+            if !text_memory.is_null() {
+                // The text alone still pastes somewhere useful.
+                let text_taken = !SetClipboardData(CF_UNICODETEXT, text_memory).is_null();
+                if !text_taken {
+                    GlobalFree(text_memory);
+                }
+            }
+            CloseClipboard();
+            taken
+        }
+    }
+}
+
+#[cfg(target_os = "macos")]
+mod imp {
+    use objc2::rc::{Retained, autoreleasepool};
+    use objc2::runtime::{AnyClass, AnyObject, ProtocolObject};
+    use objc2::{ClassType, MainThreadMarker};
+    use objc2_app_kit::{
+        NSPasteboard, NSPasteboardReadingOptionKey, NSPasteboardTypeString, NSPasteboardURLReadingFileURLsOnlyKey,
+        NSPasteboardWriting,
+    };
+    use objc2_foundation::{NSArray, NSDictionary, NSNumber, NSString, NSURL};
+    use std::path::PathBuf;
+
+    /// `NSURL` as the one class to read, limited to file URLs: a web link the
+    /// user copied is not a file to paste.
+    fn read_file_urls<R>(
+        f: impl FnOnce(&NSPasteboard, &NSArray<AnyClass>, &NSDictionary<NSPasteboardReadingOptionKey, AnyObject>) -> R,
+    ) -> R {
+        debug_assert!(MainThreadMarker::new().is_some(), "NSPasteboard access requires the main thread");
+        autoreleasepool(|_| {
+            let board = NSPasteboard::generalPasteboard();
+            let classes = NSArray::from_slice(&[NSURL::class()]);
+            let yes = NSNumber::new_bool(true);
+            // SAFETY: the key is an AppKit constant, valid for the process' lifetime.
+            let key = unsafe { NSPasteboardURLReadingFileURLsOnlyKey };
+            let options = NSDictionary::from_slices(&[key], &[yes.as_ref() as &AnyObject]);
+            f(&board, &classes, &options)
+        })
+    }
+
+    pub fn has_files() -> bool {
+        // SAFETY: the class list holds `NSURL`, which reads from pasteboards,
+        // and the option takes an `NSNumber`.
+        read_file_urls(|board, classes, options| unsafe {
+            board.canReadObjectForClasses_options(classes, Some(options))
+        })
+    }
+
+    pub fn files() -> std::io::Result<Vec<PathBuf>> {
+        read_file_urls(|board, classes, options| {
+            // SAFETY: as in `has_files`; every object read for `NSURL` is one.
+            let Some(objects) = (unsafe { board.readObjectsForClasses_options(classes, Some(options)) }) else {
+                return if unsafe { board.canReadObjectForClasses_options(classes, Some(options)) } {
+                    Err(std::io::Error::other("Cannot read clipboard files"))
+                } else {
+                    Ok(Vec::new())
+                };
+            };
+            Ok(objects
+                .iter()
+                .filter_map(|object| object.downcast::<NSURL>().ok())
+                .filter_map(|url| url.to_file_path())
+                // Finder ends a folder's URL in `/`; the project view names it without.
+                .map(|path| path.components().collect())
+                .collect())
+        })
+    }
+
+    pub fn set_files(paths: &[PathBuf]) -> bool {
+        debug_assert!(MainThreadMarker::new().is_some(), "NSPasteboard access requires the main thread");
+        autoreleasepool(|_| {
+            // Folders get a directory URL (ending in `/`), as Finder writes them.
+            let urls: Vec<Retained<NSURL>> = paths
+                .iter()
+                .filter_map(|p| if p.is_dir() { NSURL::from_directory_path(p) } else { NSURL::from_file_path(p) })
+                .collect();
+            if urls.is_empty() {
+                return false;
+            }
+            let writers: Vec<&ProtocolObject<dyn NSPasteboardWriting>> =
+                urls.iter().map(|url| ProtocolObject::from_ref(&**url)).collect();
+            let board = NSPasteboard::generalPasteboard();
+            // Replacing the list also drops the text the user copied before;
+            // the paths' own text is set back with it, so an editor paste
+            // inserts them (IDEA writes the list and the text together).
+            board.clearContents();
+            let written = board.writeObjects(&NSArray::from_slice(&writers));
+            let text = NSString::from_str(
+                &paths.iter().map(|p| p.to_string_lossy().into_owned()).collect::<Vec<_>>().join("\n"),
+            );
+            board.setString_forType(&text, unsafe { NSPasteboardTypeString });
+            written
+        })
+    }
+}
+
+#[cfg(not(any(windows, target_os = "macos")))]
+mod imp {
+    use std::path::PathBuf;
+
+    pub fn has_files() -> bool {
+        false
+    }
+
+    pub fn files() -> std::io::Result<Vec<PathBuf>> {
+        Ok(Vec::new())
+    }
+
+    pub fn set_files(_paths: &[PathBuf]) -> bool {
+        false
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn paths(list: &[&str]) -> Vec<PathBuf> {
+        list.iter().map(PathBuf::from).collect()
+    }
+
+    #[test]
+    fn a_written_list_reads_back_unchanged() {
+        let list = paths(&["C:/work/project/a.txt", "C:/work/project/sub"]);
+        assert_eq!(decode(&encode(&list)), list);
+    }
+
+    #[test]
+    fn the_header_says_where_the_paths_start_and_that_they_are_wide() {
+        let bytes = encode(&paths(&["C:/a"]));
+        assert_eq!(u32::from_le_bytes([bytes[0], bytes[1], bytes[2], bytes[3]]), HEADER as u32);
+        assert_eq!(u32::from_le_bytes([bytes[16], bytes[17], bytes[18], bytes[19]]), 1);
+        // `C:/a` plus its NUL, then the empty string that ends the list.
+        assert_eq!(bytes.len(), HEADER + (4 + 1 + 1) * 2);
+        assert_eq!(&bytes[HEADER + 6..HEADER + 8], b"a\0");
+        assert_eq!(&bytes[bytes.len() - 4..], &[0, 0, 0, 0]);
+    }
+
+    #[test]
+    fn names_outside_the_ansi_code_page_survive() {
+        let list = paths(&["C:/工作/文档/测试.txt", "C:/a/"]);
+        assert_eq!(decode(&encode(&list)), list);
+    }
+
+    #[test]
+    fn an_empty_list_has_no_paths() {
+        assert_eq!(decode(&encode(&[])), Vec::<PathBuf>::new());
+        // A lone terminator is enough for the reader to stop.
+        assert_eq!(decode(&[0u8; HEADER]), Vec::<PathBuf>::new());
+    }
+
+    #[test]
+    fn a_truncated_or_foreign_block_reads_as_no_paths() {
+        assert_eq!(decode(&[]), Vec::<PathBuf>::new());
+        assert_eq!(decode(&[1, 2, 3]), Vec::<PathBuf>::new());
+        let mut far = encode(&paths(&["C:/a"]));
+        far[0] = 0xff; // pFiles past the end
+        assert_eq!(decode(&far), Vec::<PathBuf>::new());
+    }
+
+    #[test]
+    fn an_ansi_list_is_still_read_before_the_terminator() {
+        let mut bytes = vec![0u8; HEADER];
+        bytes[..4].copy_from_slice(&(HEADER as u32).to_le_bytes());
+        bytes[16] = 0; // fWide: the list is single-byte
+        bytes.extend_from_slice(b"C:\\a\\b.txt\0C:\\c\0\0");
+        assert_eq!(decode(&bytes), paths(&["C:\\a\\b.txt", "C:\\c"]));
+    }
+}

crates/ide-core/Cargo.toml

@@ -7,8 +7,16 @@ license.workspace = true
 
 [dependencies]
 dunce.workspace = true
+encoding_rs.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 specta.workspace = true
+specta-typescript.workspace = true
 thiserror.workspace = true
 tokio-util.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
+
+[target.'cfg(windows)'.dependencies]
+windows-sys = { version = "0.61", features = ["Win32_Globalization", "Win32_System_Registry", "Win32_Foundation"] }

crates/ide-core/src/editor_settings.rs

@@ -12,6 +12,8 @@ use std::collections::BTreeMap;
 pub struct EditorGeneralSettings {
     /// Change font size with ⌘ + mouse wheel.
     pub wheel_zoom: bool,
+    pub markdown_image_folder: String,
+    pub markdown_image_name_pattern: String,
     /// Drag-and-drop of selected text inside the editor.
     pub drag_and_drop: bool,
     /// When the caret moves out of view: `minimize` scrolling | `center` the caret line.
@@ -35,11 +37,13 @@ impl Default for EditorGeneralSettings {
     fn default() -> Self {
         Self {
             wheel_zoom: false,
+            markdown_image_folder: "assets".into(),
+            markdown_image_name_pattern: "image-{timestamp}".into(),
             drag_and_drop: true,
             caret_scroll: "minimize".into(),
             soft_wrap_files: "*.md; *.txt; *.rst; *.adoc".into(),
             soft_wrap_indent: true,
-            scroll_past_end: true,
+            scroll_past_end: false,
             strip_trailing_scope: "modified".into(),
             keep_trailing_on_caret_line: true,
             remove_trailing_blank_lines: false,
@@ -55,7 +59,13 @@ pub struct EditorAppearanceSettings {
     pub caret_blinking: bool,
     /// Blink period in ms.
     pub caret_blink_period: u32,
+    /// Fade the caret in and out instead of toggling it; rounds its corners.
+    pub smooth_caret_blinking: bool,
     pub block_caret: bool,
+    /// Animate the caret between positions when it is moved.
+    pub smooth_caret_movement: bool,
+    /// Smooth caret movement curve: `snappy` | `gliding`.
+    pub caret_movement_style: String,
     pub line_numbers: bool,
     pub method_separators: bool,
     /// Sub-options of `editor.showWhitespace`.
@@ -75,7 +85,10 @@ impl Default for EditorAppearanceSettings {
         Self {
             caret_blinking: true,
             caret_blink_period: 500,
+            smooth_caret_blinking: false,
             block_caret: false,
+            smooth_caret_movement: false,
+            caret_movement_style: "snappy".into(),
             line_numbers: true,
             method_separators: false,
             whitespace_leading: true,
@@ -102,7 +115,7 @@ pub struct BreadcrumbsSettings {
 
 impl Default for BreadcrumbsSettings {
     fn default() -> Self {
-        Self { show: false, placement: "bottom".into(), disabled_languages: Vec::new() }
+        Self { show: true, placement: "bottom".into(), disabled_languages: Vec::new() }
     }
 }
 
@@ -117,6 +130,12 @@ pub struct CompletionSettings {
     pub auto_popup: bool,
     /// Insert the selected suggestion by pressing space, dot, or other context-dependent keys.
     pub insert_on_special_keys: bool,
+    /// Insert a sole suggestion of explicit (⌃Space) completion right away.
+    pub auto_insert_single: bool,
+    /// Sort suggestions by name instead of relevance.
+    pub sort_alphabetically: bool,
+    /// Add `()` after function and method suggestions.
+    pub insert_parentheses: bool,
     pub show_documentation: bool,
     pub documentation_delay: u32,
     pub parameter_info: bool,
@@ -130,10 +149,13 @@ impl Default for CompletionSettings {
             case_sensitivity: "first".into(),
             auto_popup: true,
             insert_on_special_keys: false,
-            show_documentation: true,
+            auto_insert_single: true,
+            sort_alphabetically: false,
+            insert_parentheses: true,
+            show_documentation: false,
             documentation_delay: 500,
             parameter_info: true,
-            parameter_info_delay: 300,
+            parameter_info_delay: 1000,
         }
     }
 }
@@ -166,13 +188,22 @@ impl Default for FoldingSettings {
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
 #[serde(default, rename_all = "camelCase")]
 pub struct EditorTabsSettings {
-    /// `top` | `none`.
+    /// `top` | `bottom` | `none`.
     pub placement: String,
     pub multiple_rows: bool,
+    /// One row that doesn't fit: `scroll` the tabs panel | `squeeze` the tabs.
+    pub one_row_overflow: String,
+    pub pinned_separate_row: bool,
+    pub show_file_icon: bool,
     pub show_extension: bool,
+    pub show_directory_for_non_unique: bool,
     /// Mark modified tabs with an asterisk.
     pub mark_modified: bool,
+    pub show_full_path_on_hover: bool,
     pub show_close_button: bool,
+    /// `right` | `left` (with `show_close_button`).
+    pub close_button_position: String,
+    pub sort_alphabetically: bool,
     pub preview_tab: bool,
     pub open_at_end: bool,
     pub tab_limit: u32,
@@ -187,14 +218,21 @@ impl Default for EditorTabsSettings {
         Self {
             placement: "top".into(),
             multiple_rows: false,
+            one_row_overflow: "scroll".into(),
+            pinned_separate_row: false,
+            show_file_icon: true,
             show_extension: true,
+            show_directory_for_non_unique: true,
             mark_modified: false,
+            show_full_path_on_hover: true,
             show_close_button: true,
+            close_button_position: "right".into(),
+            sort_alphabetically: false,
             preview_tab: true,
             open_at_end: false,
-            tab_limit: 10,
-            closing_policy: "unchanged".into(),
-            activate_on_close: "mru".into(),
+            tab_limit: 30,
+            closing_policy: "lru".into(),
+            activate_on_close: "left".into(),
         }
     }
 }
@@ -214,7 +252,7 @@ pub struct SmartKeysSettings {
     /// Reformat on paste: `none` | `indentBlock` | `indentEachLine`.
     pub reformat_on_paste: String,
     pub smart_indent: bool,
-    /// Backspace › Unindent: `nearest` indent position | `none`.
+    /// Backspace › Unindent: `autoindent` (proper indent position) | `nearest` indent position | `none`.
     pub backspace_unindent: String,
 }
 
@@ -226,10 +264,10 @@ impl Default for SmartKeysSettings {
             pair_brackets: true,
             pair_quotes: true,
             surround_selection: true,
-            tab_out_of_pair: false,
-            reformat_on_paste: "indentBlock".into(),
+            tab_out_of_pair: true,
+            reformat_on_paste: "indentEachLine".into(),
             smart_indent: true,
-            backspace_unindent: "nearest".into(),
+            backspace_unindent: "autoindent".into(),
         }
     }
 }
@@ -275,11 +313,38 @@ pub struct InlayHintsSettings {
     pub disabled_languages: Vec<String>,
     /// Code vision: usages above declarations.
     pub code_vision_usages: bool,
+    /// Code vision: last author of a declaration (VCS blame) beside its usages.
+    pub code_vision_author: bool,
 }
 
 impl Default for InlayHintsSettings {
     fn default() -> Self {
-        Self { types: true, parameters: true, other: true, disabled_languages: Vec::new(), code_vision_usages: true }
+        Self {
+            types: true,
+            parameters: true,
+            other: true,
+            disabled_languages: Vec::new(),
+            code_vision_usages: true,
+            code_vision_author: true,
+        }
+    }
+}
+
+/// Editor › General › Inline Completion: ghost text from language servers that
+/// support `textDocument/inlineCompletion` (LSP 3.18).
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(default, rename_all = "camelCase")]
+pub struct InlineCompletionSettings {
+    pub enabled: bool,
+    /// Ask only once typing has paused for `pause_ms`, instead of right after each change.
+    pub only_on_pause: bool,
+    pub pause_ms: u32,
+    pub disabled_languages: Vec<String>,
+}
+
+impl Default for InlineCompletionSettings {
+    fn default() -> Self {
+        Self { enabled: true, only_on_pause: false, pause_ms: 500, disabled_languages: Vec::new() }
     }
 }
 
@@ -306,6 +371,12 @@ pub struct TextAttributesOverride {
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize, Type)]
 #[serde(default, rename_all = "camelCase")]
 pub struct LanguageCodeStyle {
+    /// Java formatter: `default` | `intellij` | `custom` (other languages ignore it).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub formatter: Option<String>,
+    /// Eclipse formatter XML; relative paths start at the project root.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub formatter_path: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub use_tab: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -314,6 +385,12 @@ pub struct LanguageCodeStyle {
     pub indent: Option<u32>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub hard_wrap_at: Option<u32>,
+    /// Comment Code › Line comment at first column.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub line_comment_at_first_column: Option<bool>,
+    /// Comment Code › Add a space at line comment start.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub line_comment_add_space: Option<bool>,
 }
 
 /// Editor › Code Style (General tab + per-language overrides).
@@ -329,6 +406,14 @@ pub struct CodeStyleSettings {
     /// Enable EditorConfig support.
     pub editorconfig: bool,
     pub languages: BTreeMap<String, LanguageCodeStyle>,
+    /// Formatter › Do not format: globs (`*.min.js`, `generated/**`) Reformat Code skips.
+    pub do_not_format: Vec<String>,
+    /// Formatter › Turn formatter on/off with markers in code comments.
+    pub formatter_tags_enabled: bool,
+    pub formatter_off_tag: String,
+    pub formatter_on_tag: String,
+    /// The markers are regular expressions.
+    pub formatter_tags_regexp: bool,
 }
 
 impl Default for CodeStyleSettings {
@@ -340,6 +425,11 @@ impl Default for CodeStyleSettings {
             detect_indents: true,
             editorconfig: true,
             languages: BTreeMap::new(),
+            do_not_format: Vec::new(),
+            formatter_tags_enabled: false,
+            formatter_off_tag: "@formatter:off".into(),
+            formatter_on_tag: "@formatter:on".into(),
+            formatter_tags_regexp: false,
         }
     }
 }
@@ -354,6 +444,8 @@ pub struct EncodingSettings {
     pub project: String,
     /// Fallback for `.properties` files.
     pub properties: String,
+    /// Display properties Unicode escapes as characters and save non-ASCII as escapes.
+    pub native_to_ascii: bool,
     /// Create UTF-8 files: `never` (no BOM) | `always` (with BOM) | `windows` (with BOM on Windows).
     pub utf8_bom: String,
 }
@@ -364,6 +456,7 @@ impl Default for EncodingSettings {
             global: "utf-8".into(),
             project: "utf-8".into(),
             properties: "iso-8859-1".into(),
+            native_to_ascii: false,
             utf8_bom: "never".into(),
         }
     }

crates/ide-core/src/error.rs

@@ -12,6 +12,15 @@ pub type IdeResult<T> = Result<T, IdeError>;
 pub struct IdeError {
     pub kind: ErrorKind,
     pub message: String,
+    /// Structured detail for errors the UI acts on; `null` for plain errors.
+    #[specta(optional)]
+    pub data: Option<ErrorData>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(tag = "type", rename_all = "camelCase")]
+pub enum ErrorData {
+    Tool { tool: String, missing: bool },
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
@@ -24,6 +33,7 @@ pub enum ErrorKind {
     /// Document version mismatch; the UI must resync the full text.
     OutOfSync,
     Cancelled,
+    TimedOut,
     /// A required external tool (language server, git, debugger) is unavailable.
     Unavailable,
     Io,
@@ -33,7 +43,21 @@ pub enum ErrorKind {
 
 impl IdeError {
     pub fn new(kind: ErrorKind, message: impl Into<String>) -> Self {
-        Self { kind, message: message.into() }
+        Self { kind, message: message.into(), data: None }
+    }
+    pub fn with_tool(mut self, tool: impl Into<String>) -> Self {
+        if self.data.is_none() {
+            self.data = Some(ErrorData::Tool { tool: tool.into(), missing: false });
+        }
+        self
+    }
+    pub fn missing_tool(tool: impl Into<String>) -> Self {
+        let tool = tool.into();
+        Self {
+            kind: ErrorKind::NotFound,
+            message: format!("{tool} is not installed"),
+            data: Some(ErrorData::Tool { tool, missing: true }),
+        }
     }
     pub fn not_found(m: impl Into<String>) -> Self {
         Self::new(ErrorKind::NotFound, m)
@@ -65,3 +89,30 @@ impl From<std::io::Error> for IdeError {
         Self::new(kind, e.to_string())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn tool_errors_round_trip_without_changing_diagnostics() {
+        let message = "[error] file.css: Unexpected token\n  1 | }\n";
+        let error = IdeError::invalid(message).with_tool("prettier");
+        let decoded: IdeError = serde_json::from_str(&serde_json::to_string(&error).unwrap()).unwrap();
+        assert_eq!(decoded.message, message);
+        assert_eq!(decoded.data, Some(ErrorData::Tool { tool: "prettier".into(), missing: false }));
+        let missing = IdeError::missing_tool("prettier").with_tool("prettier");
+        assert_eq!(missing.kind, ErrorKind::NotFound);
+        assert_eq!(missing.data, Some(ErrorData::Tool { tool: "prettier".into(), missing: true }));
+    }
+
+    #[test]
+    fn legacy_errors_need_no_data() {
+        let error: IdeError = serde_json::from_str(r#"{"kind":"unavailable","message":"no server"}"#).unwrap();
+        assert!(error.data.is_none());
+        assert_eq!(
+            serde_json::to_value(error).unwrap(),
+            serde_json::json!({"kind":"unavailable","message":"no server","data":null})
+        );
+    }
+}

crates/ide-core/src/event.rs

@@ -13,12 +13,22 @@ use std::sync::Arc;
 #[derive(Clone, Debug, Serialize, Deserialize, Type)]
 #[serde(tag = "type", rename_all = "camelCase", rename_all_fields = "camelCase")]
 pub enum IdeEvent {
+    /// Project window membership or selection changed.
+    WindowGroupsChanged,
+    ProjectTrustChanged {
+        root: crate::IpcPath,
+        trusted: bool,
+    },
     /// Files or directories changed on disk (after debouncing, ignore rules applied).
     FsChanged {
         created: Vec<crate::IpcPath>,
         modified: Vec<crate::IpcPath>,
         removed: Vec<crate::IpcPath>,
     },
+    /// Excluded or ignored folders whose contents changed; they stay out of `FsChanged`.
+    ExcludedDirsChanged {
+        dirs: Vec<crate::IpcPath>,
+    },
     /// The backend changed a document (reload from disk, formatting, refactoring).
     /// The UI applies `changes` on top of `base_version`, yielding `version`.
     DocPatched {
@@ -32,6 +42,14 @@ pub enum IdeEvent {
         doc: DocId,
         dirty: bool,
     },
+    /// An open document's language changed (Settings › File Types, Override File
+    /// Type), or its UI mode (a framework's root marker appeared or went).
+    DocLanguage {
+        doc: DocId,
+        language: crate::LanguageId,
+        /// See `DocumentInfo::ui_mode`.
+        ui_mode: Option<String>,
+    },
     /// Full replacement of diagnostics for one file from one producer.
     Diagnostics {
         path: crate::IpcPath,
@@ -45,6 +63,8 @@ pub enum IdeEvent {
         message: Option<String>,
         fraction: Option<f32>,
         done: bool,
+        /// The UI may stop it with `cancel_task(id)` (see [`crate::task`]).
+        cancellable: bool,
     },
     /// Project indexing state changed (dumb mode on/off).
     IndexState {
@@ -62,6 +82,11 @@ pub enum IdeEvent {
         status: ServerStatus,
         message: Option<String>,
     },
+    /// A stopped language server left the project's list (disabled in settings, or a
+    /// fallback that a preferred server took over from again).
+    LanguageServerRemoved {
+        server: ServerId,
+    },
     /// A language server asked clients to re-request one kind of data for its
     /// open documents (`workspace/inlayHint/refresh`, …), e.g. after indexing.
     LspRefresh {
@@ -95,6 +120,39 @@ pub enum IdeEvent {
     ProjectRootsChanged {
         root: crate::IpcPath,
     },
+    /// A child process (`ssh`, `git`) asks for a credential; answered with `ssh_askpass_answer`.
+    Askpass {
+        id: u64,
+        prompt: String,
+        kind: AskpassKind,
+        /// The dialog offers "Remember" for the answer (git HTTPS passwords).
+        remember: bool,
+    },
+    /// Prompt `id` was answered (in any window) or gave up.
+    AskpassDone {
+        id: u64,
+    },
+    /// The kernel of an open notebook changed state (`starting`, `idle`, `busy`,
+    /// `dead`); `message` says why it failed to start or died.
+    NotebookKernel {
+        /// Backend document incarnation; stale queued events cannot target a reopen.
+        id: String,
+        path: crate::IpcPath,
+        state: String,
+        message: Option<String>,
+    },
+}
+
+/// What an askpass prompt asks for.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum AskpassKind {
+    /// Password or passphrase: hidden input.
+    Secret,
+    /// User name: visible input.
+    Text,
+    /// Yes / no (an unknown host key); answered with `yes` or `no`.
+    Confirm,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
@@ -106,6 +164,9 @@ pub enum ServerStatus {
     Crashed,
     Stopped,
     Missing,
+    /// Not started: its configuration can't launch it (e.g. no JDK new enough);
+    /// the message says what to change, and a settings change retries.
+    Misconfigured,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]

crates/ide-core/src/inspection_settings.rs

@@ -0,0 +1,114 @@
+//! Settings › Editor › Inspections: inspection profiles. `Default` and the
+//! user's IDE-level copies live in the IDE (global) settings, `Project Default`
+//! and project-level copies in the project's; the project picks which one is in
+//! effect. The UI applies the profile to diagnostics. Also Editor › Natural
+//! Languages › Spelling (the Typo inspection's dictionaries).
+
+use serde::{Deserialize, Serialize};
+use specta::Type;
+use std::collections::BTreeMap;
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(default, rename_all = "camelCase")]
+pub struct InspectionSettings {
+    /// Profile in effect for the project: `default`, `project`, or a copy
+    /// as `ide:<key>` / `project:<key>`.
+    pub profile: String,
+    /// The `Default` profile (IDE level): inspection id → override.
+    pub default: BTreeMap<String, InspectionOverride>,
+    /// The `Project Default` profile (stored with the project).
+    pub project: BTreeMap<String, InspectionOverride>,
+    /// Profiles copied at IDE level (global settings), by key.
+    pub ide_profiles: BTreeMap<String, CustomInspectionProfile>,
+    /// Profiles copied at project level (project settings), by key.
+    pub project_profiles: BTreeMap<String, CustomInspectionProfile>,
+}
+
+impl Default for InspectionSettings {
+    fn default() -> Self {
+        Self {
+            profile: "default".into(),
+            default: BTreeMap::new(),
+            project: BTreeMap::new(),
+            ide_profiles: BTreeMap::new(),
+            project_profiles: BTreeMap::new(),
+        }
+    }
+}
+
+/// A named profile made with Copy.
+#[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(default, rename_all = "camelCase")]
+pub struct CustomInspectionProfile {
+    pub name: String,
+    pub overrides: BTreeMap<String, InspectionOverride>,
+}
+
+/// Editor › Natural Languages › Spelling.
+#[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(default, rename_all = "camelCase")]
+pub struct SpellingSettings {
+    /// Application-level dictionary: accepted words (IDE settings).
+    pub ide_words: Vec<String>,
+    /// Project-level dictionary: accepted words (project settings).
+    pub project_words: Vec<String>,
+    /// Custom dictionaries: plain word lists or Hunspell `.dic` files.
+    pub custom_dictionaries: Vec<String>,
+}
+
+/// Changes to one inspection; absent fields keep the inspection's defaults.
+#[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(default, rename_all = "camelCase")]
+pub struct InspectionOverride {
+    #[specta(optional)]
+    pub enabled: Option<bool>,
+    #[specta(optional)]
+    pub severity: Option<InspectionLevel>,
+    /// The inspection's own options (Typo: `processCode`, `processLiterals`,
+    /// `processComments`); absent ones keep their defaults.
+    #[specta(optional)]
+    pub options: Option<BTreeMap<String, bool>>,
+}
+
+/// IDEA's highlighting levels.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum InspectionLevel {
+    Error,
+    Warning,
+    WeakWarning,
+    ServerProblem,
+    Typo,
+    /// Reported (Problems, Inspect Code) but not highlighted in the editor.
+    None,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn overrides_parse_partially() {
+        let s: InspectionSettings = serde_json::from_str(
+            r#"{"default":{"lsp:ruff":{"enabled":false},"lsp:ruff:F401":{"severity":"weakWarning"}}}"#,
+        )
+        .unwrap();
+        assert_eq!(s.profile, "default");
+        assert_eq!(s.default["lsp:ruff"].enabled, Some(false));
+        assert_eq!(s.default["lsp:ruff:F401"].severity, Some(InspectionLevel::WeakWarning));
+        assert!(s.project.is_empty());
+        assert!(s.ide_profiles.is_empty());
+        let s: InspectionSettings = serde_json::from_str(
+            r#"{"profile":"ide:strict","ideProfiles":{"strict":{"name":"Strict","overrides":{"lsp:ruff":{"severity":"error"}}}}}"#,
+        )
+        .unwrap();
+        assert_eq!(s.ide_profiles["strict"].name, "Strict");
+        assert_eq!(s.ide_profiles["strict"].overrides["lsp:ruff"].severity, Some(InspectionLevel::Error));
+        assert!(serde_json::from_str::<InspectionSettings>(r#"{"default":{"x":{"severity":"loud"}}}"#).is_err());
+        let s: InspectionSettings =
+            serde_json::from_str(r#"{"default":{"builtin:spelling":{"options":{"processCode":false}}}}"#).unwrap();
+        assert!(!s.default["builtin:spelling"].options.as_ref().unwrap()["processCode"]);
+        let back: InspectionSettings = serde_json::from_str(&serde_json::to_string(&s).unwrap()).unwrap();
+        assert_eq!(back, s);
+    }
+}

crates/ide-core/src/jsonc.rs

@@ -0,0 +1,90 @@
+//! JSON with comments (`devcontainer.json`, `deno.jsonc`, `tsconfig.json`): turned
+//! into plain JSON for `serde_json`.
+
+/// Strips `//` and `/* */` comments and trailing commas so JSONC parses as JSON.
+pub fn strip(src: &str) -> String {
+    let mut out = String::with_capacity(src.len());
+    let mut chars = src.chars().peekable();
+    let mut in_str = false;
+    while let Some(c) = chars.next() {
+        if in_str {
+            out.push(c);
+            if c == '\\' {
+                if let Some(n) = chars.next() {
+                    out.push(n);
+                }
+            } else if c == '"' {
+                in_str = false;
+            }
+            continue;
+        }
+        match c {
+            '"' => {
+                in_str = true;
+                out.push(c);
+            }
+            '/' if chars.peek() == Some(&'/') => {
+                for n in chars.by_ref() {
+                    if n == '\n' {
+                        out.push('\n');
+                        break;
+                    }
+                }
+            }
+            '/' if chars.peek() == Some(&'*') => {
+                chars.next();
+                let mut prev = '\0';
+                for n in chars.by_ref() {
+                    if prev == '*' && n == '/' {
+                        break;
+                    }
+                    prev = n;
+                }
+            }
+            _ => out.push(c),
+        }
+    }
+    // Remove trailing commas before `}` / `]` (outside strings).
+    let mut cleaned = String::with_capacity(out.len());
+    let bytes: Vec<char> = out.chars().collect();
+    let mut in_str = false;
+    let mut i = 0;
+    while i < bytes.len() {
+        let c = bytes[i];
+        if in_str {
+            cleaned.push(c);
+            if c == '\\' && i + 1 < bytes.len() {
+                cleaned.push(bytes[i + 1]);
+                i += 1;
+            } else if c == '"' {
+                in_str = false;
+            }
+        } else if c == '"' {
+            in_str = true;
+            cleaned.push(c);
+        } else if c == ',' {
+            let next = bytes[i + 1..].iter().find(|ch| !ch.is_whitespace());
+            if !matches!(next, Some('}') | Some(']')) {
+                cleaned.push(c);
+            }
+        } else {
+            cleaned.push(c);
+        }
+        i += 1;
+    }
+    cleaned
+}
+
+#[cfg(test)]
+mod tests {
+    use super::strip;
+
+    #[test]
+    fn drops_comments_and_trailing_commas_outside_strings() {
+        let src = "{\n  // line\n  \"a\": [1, 2,], /* block */\n  \"url\": \"https://x.dev//y /* no */\",\n  \"q\": \"say \\\"hi\\\",\",\n}\n";
+        let v: serde_json::Value = serde_json::from_str(&strip(src)).unwrap();
+        assert_eq!(v["a"], serde_json::json!([1, 2]));
+        assert_eq!(v["url"], "https://x.dev//y /* no */");
+        assert_eq!(v["q"], "say \"hi\",");
+    }
+}