feat(plugins): commit workflow API for plugins

Plugin API 1.3 adds what commit-message generators and before-commit checks need:

- `menu = "commit.message"`: a plugin command, with the plugin's icon, in the toolbar above the commit message of the Commit tool window and the Commit dialog.
- `commit.pending-commit()` (`vcs.read`): what Commit would commit right now, per file its repository, path, status and a `git diff` of only the included files and changed blocks against HEAD (1 MiB in all), plus the message, Amend and a revision. The diff is made by the same selection the commit uses, in a copy of the index, so the index and the working tree stay as they are; unsaved editors of the included files are saved first, as Commit does. Only in trusted projects.
- `commit.set-commit-message(revision, message)` (`vcs.write`): replaces the message only while the draft is still at that revision, so text the user typed meanwhile is never overwritten (`stale`).
- `[[contributes.commitChecks]]` and the optional `commit-checker` export (worlds `plugin-commit-checks` / `commit-checks`): checks listed in Commit Options (on by default, `vcs.commit.disabledPluginChecks` turns them off) and run after the IDE's own; their problems, optionally with a location, stop the commit until Commit Anyway.

The window answers the host through `CommitRequested` / `plugin_answer_commit`, also for remote windows. The Rust SDK gains `host::pending_commit`, `host::set_commit_message`, `openidea_plugin::commit` and their mock; a `commit` test fixture exercises them. All components are rebuilt for the WIT change.

Refs #1650

.agents/skills/issue-fix/SKILL.md

@@ -0,0 +1,91 @@
+---
+name: issue-fix
+description: Triage and fix a GitHub issue (or a user-reported bug) end to end — reproduce, find the root cause, generalise it to every sibling case, fix the class rather than the instance, verify, and open one PR. Use when given an issue URL/number or asked to fix a reported bug and open a PR ("看看这个 issue", "修一下这个 bug", "提 pr").
+---
+
+# Fix an issue: from one case to the whole class
+
+The reported case is one sample of a defect class. A fix that only makes the
+screenshot go away is not done: the next question is always "does this break for other
+languages / platforms / entry points too?". Answer that before anyone asks.
+
+## 1. Read and reproduce
+
+- `gh issue view <n> --comments` (repo `l0ng-ai/openidea`). Read attached logs/screenshots
+  closely: OS, language, toolchain versions, exact error text.
+- Locate the code path and confirm the claim in code, with `file:line` evidence.
+  Say plainly whether it is a real bug, a missing feature, or user environment.
+- Reproduce locally when possible (`fixtures/` projects, `/verify` for runtime). If the
+  reporter's platform (often Windows/Linux) can't be reproduced here, say so up front.
+- Do not ask for a generic environment/log checklist before trying the flow and inspecting the code.
+  Record the attempt and result; ask only for a fact that actually blocks the next diagnostic step.
+  Missing fields, limited time, or unavailable automation are not by themselves reasons to ask the reporter.
+- Treat a maintainer-confirmed bug as an investigation task even if local reproduction fails. Distinguish
+  “not reproduced here” from “not a bug”, and do not require the reporter to prove its existence again.
+
+## 2. Name the root cause as a class
+
+Write one sentence of the form "<mechanism> is missing/wrong, so any <X> hits it",
+not "<this button> is broken". Typical classes in this codebase:
+
+- Per-language config handled for one language only (`languages/*.toml`, `ide-sdk`).
+- Platform gaps: paths, executables, shells, `.cmd`/`.exe`, separators — macOS-only code.
+- Toolchain/version discovery: one probe location, no version check, no rescan.
+- Two features each implementing half a flow and never joined (feature isolation →
+  should go through an action/service).
+- State not reset on project switch / window reuse; events not scoped per window.
+- Failure surfaced as raw stderr/stack trace or retried until "crashed" instead of a
+  clear status with an action.
+- UI: same primitive styled differently in N places.
+
+## 3. Sweep for siblings
+
+Search systematically, not by memory:
+
+- Same pattern elsewhere: `git grep` the function, the config key, the error string,
+  the hard-coded path/flag. Check every `languages/*.toml` entry and every platform branch.
+- Same flow for other languages/runtimes (Java ↔ Kotlin/Gradle, Python ↔ venv/uv,
+  Node ↔ Deno/Bun, Go, Rust …): would they fail the same way?
+- Other callers/entry points of the same flow (menu, context menu, gutter, shortcut, CLI arg).
+- Neighbouring failure modes of the same mechanism (not installed / wrong version /
+  installed but crashes / slow start / installed mid-session).
+  For broad sweeps spawn one Explore agent with the class description, not the instance.
+
+## 4. Decide the fix at the right altitude
+
+- Fix the mechanism once (shared helper, action, config hook) so siblings are fixed
+  by construction; don't patch each call site.
+- Respect `AGENTS.md` rules (crate boundaries, no cross-feature imports, `IdeResult`,
+  UTF-16). If the right fix breaks a rule, pick the rule-respecting design and say why.
+- Compare with how established IDEs solve it when relevant; prefer the established answer.
+- Present: root cause, sibling table, proposed fix, what's deferred. When the user leaves
+  the choice to you, go ahead without asking again.
+
+## 5. Implement and test the class
+
+- Tests cover the class: table-driven over languages/platforms/states, not just the
+  reported input. Include the reporter's case verbatim.
+- Run the scoped checks (`pnpm vitest run <path>`, `cargo nextest run -p <crate>`), then
+  `/verify` in the app for UI or runtime behaviour.
+
+## 6. PR
+
+- One branch `fix/<slug>`, one PR unless the user asks otherwise; `Fixes #<n>` in the body.
+- Don't stage untracked IDE-state dirs (`.ideal/`, `.openidea/`) or screenshots.
+- PR body follows `.github/pull_request_template.md`: `Closes #<n>`, then
+  **What and why** (user-visible change + root cause at class level, 2–4 sentences),
+  **How it was verified** (commands run and results, siblings fixed/deferred, what could break and how
+  it was checked, what was not verified, e.g. "Windows not tested"; for UI changes the before/after
+  screenshot paths from `/verify`), **Review focus** (optional). Short and plain.
+
+## Report format
+
+Reply in the user's language:
+
+```
+Root cause: <one sentence, class level>
+Sibling sweep:
+| Location / case | Affected? | Action |
+Fixed / not covered (why) / not verified (platform)
+PR: <url>
+```

.agents/skills/verify/SKILL.md

@@ -0,0 +1,57 @@
+---
+name: verify
+description: Build, launch and drive the OpenIDEA desktop app through the Tauri MCP bridge to verify a change at runtime.
+---
+
+# Verify OpenIDEA in the running app
+
+## Launch
+
+- Run the app from the worktree that holds the change: `pnpm tauri dev` in the background, logging
+  into your task's scratch subdirectory. Use `pnpm dev:app` instead when your checks call
+  `window.__TAURI__` from `execute_js`. The wrapper gives each worktree its own app identity, data,
+  settings and Vite port, so other worktrees and the installed app don't interfere. If it reports a
+  session already running for this worktree, reuse that one.
+- Once the app is up, `pnpm dev:status` lists this worktree's MCP bridges. Pass the reported
+  `appIdentifier` (the port) on every `mcp__tauri__*` call. The MCP server is shared between
+  sessions: never `driver_session stop` without an `appIdentifier`, and re-check `document.title` /
+  `location.href` before acting if anything looks off.
+- Make sure the binary contains the change: a session already running for this worktree may be an
+  older build. Restart it after Rust changes; frontend changes reload through Vite.
+- After the app restarts, `driver_session start` again for your port (a stale session says "Already connected").
+- If the `pnpm tauri dev` process exits while the app window stays open, Vite is gone and any webview
+  reload shows an empty `#root`. Stop that app and start the session again.
+- Stop everything you started when done and nothing else; never use process-name kills.
+
+## Driving
+
+- `manage_window focus` before screenshots / timing-sensitive steps: a background window throttles timers
+  (debounced LSP / VCS refreshes stall, `setTimeout` promises in `execute_js` time out) and native
+  screenshots come back black.
+- Settings is a separate native window `settings-main`; pass `windowId`, focus it before screenshotting.
+- CodeMirror / xterm ignore MCP `type`. Focus the element, then `document.execCommand('insertText', false, text)`.
+  For xterm Enter, dispatch a `keydown` (`key: 'Enter', keyCode: 13`) on `.xterm-helper-textarea`.
+- MCP clicks arrive with `event.detail === 0`; CodeMirror treats them as line-select clicks. Set the caret
+  through the view instead: `document.querySelector('.cm-content').cmTile.view`.
+- MCP `text` strategy can resolve to a hidden node; prefer coordinates (CSS px = image px × 0.9) or CSS selectors.
+- CSS-module edits often trigger a full page reload in dev: dialogs close, Run sessions and terminal
+  scrollback reset, and each reload spawns a fresh shell. Re-open what you were testing.
+
+## Evidence
+
+- For UI or interaction changes, capture `before.png` (on `main` or with the fix reverted) and
+  `after.png` at the same state and window size, into your task's scratch subdirectory. Multi-step
+  flows: a numbered series (`after-1.png`, `after-2.png`, ...).
+- Report the absolute paths; they go into the PR's **How it was verified** section and the triage
+  acceptance entry. Never commit screenshots to the feature branch.
+
+## Fixture
+
+`fixtures/` has sample projects (go-app, rust-app, ts-app, kotlin-gradle, polyglot). Copy one into
+your scratch directory before editing it, and don't commit the IDE state it creates (`.openidea/`).
+
+## Flows worth driving
+
+⌘⇧O Goto File · ⌘⇧F Find in Files (preview scroll + highlight) · ⌘⇧A Find Action · editor edit/undo/autosave ·
+Terminal (Unicode, venv) · Commit view at the default narrow width · Problems · Run → Stop · Project view
+New / Delete (nested `a/b.txt` names) · ⌘, Settings search (+ Keymap filter) · Git Log on a repo without commits.

.claude/skills/issue-fix

@@ -0,0 +1 @@
+../../.agents/skills/issue-fix

.claude/skills/verify

@@ -0,0 +1 @@
+../../.agents/skills/verify

.git-blame-ignore-revs

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

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,75 @@
+name: Bug report
+description: Something in OpenIDEA doesn't work as expected
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting! Keep logs and error messages exactly as they appear.
+
+        One problem per issue, please. If you have several, open one issue for each.
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Before you start
+      options:
+        - label: I searched [existing issues](https://github.com/l0ng-ai/openidea/issues?q=is%3Aissue) and this hasn't been reported yet.
+          required: true
+        - label: I'm on the [latest release](https://github.com/l0ng-ai/openidea/releases/latest), or I noted below that I can't update.
+          required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: |
+        Open **About OpenIDEA** (macOS: OpenIDEA menu; Windows/Linux: Help menu), click **Copy Info**, and paste it here. Also mention the project type if it matters (e.g. Gradle multi-module, Spring Boot, Go workspace) and whether you use remote development.
+      render: text
+      placeholder: |
+        About OpenIDEA
+        Version: 0.1.33
+        Build: ...
+        Platform: macOS aarch64
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Start from opening OpenIDEA or a project. A small sample project or snippet helps a lot.
+      placeholder: |
+        1. Open a Gradle project whose settings.gradle includes modules in a loop
+        2. Open the Gradle tool window
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Minimal reproduction
+      description: A link to a small public repository, or the smallest files/snippet that trigger the problem. Optional, but it's the fastest way to get a fix.
+      placeholder: https://github.com/you/repro-project
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: What happened instead. Screenshots or a recording are welcome.
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: |
+        Use **Help → Show Log in Finder / Explorer / Files** to find `openidea.log` and paste the lines around the problem, or attach the file. Include console output or error messages too. Check for tokens or passwords before posting.
+      render: text
+  - type: textarea
+    id: extra
+    attributes:
+      label: Additional context
+      description: Anything else, such as whether it worked in an earlier version.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Download the latest release
+    url: https://github.com/l0ng-ai/openidea/releases/latest
+    about: Many problems are already fixed. Please check the latest version before reporting.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,48 @@
+name: Feature request
+description: Suggest a new feature or an improvement
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        One request per issue, please.
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Before you start
+      options:
+        - label: I searched [existing issues](https://github.com/l0ng-ai/openidea/issues?q=is%3Aissue) and this hasn't been requested yet.
+          required: true
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What are you trying to do, and what gets in the way today?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: How you'd like it to work. Mockups or examples from other tools are welcome.
+    validations:
+      required: true
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Acceptance criteria
+      description: How we'll know it's done. One observable behavior per line.
+      placeholder: |
+        - [ ] Right-clicking a test class shows "Run with Coverage"
+        - [ ] Coverage results open in the Coverage tool window
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives and workarounds
+      description: Other approaches you considered, or what you do now instead.
+  - type: textarea
+    id: extra
+    attributes:
+      label: Additional context

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+<!-- If this resolves an issue: Closes #<n> -->
+
+## What and why
+
+<!-- 2–4 sentences: the change a user notices, and the root cause.
+     If it doesn't fit, the PR is probably too big; split it. -->
+
+## How it was verified
+
+<!-- Required. Commands you actually ran and their results; what else this could
+     affect and how you checked it still works.
+     Visible UI changes: before/after screenshots (not for removed UI or copy-only
+     changes). Multi-step interactions: a recording.
+     Backend changes: logs or command output. -->
+
+## Review focus
+
+<!-- Optional: anything you want reviewers to look at closely. -->

.github/workflows/ci.yml

@@ -3,33 +3,86 @@ on:
   push:
     branches: [main]
   pull_request:
+    branches: [main]
+    types: [opened, synchronize, reopened]
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 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
   CARGO_INCREMENTAL: 0
+  # Line tables keep test backtraces readable; full debuginfo only adds build time and cache size.
+  CARGO_PROFILE_DEV_DEBUG: line-tables-only
 
 jobs:
+  # Which parts a pull request touches, so jobs it can't affect skip and leave the
+  # shared runners to others. Pushes and manual runs always run everything.
+  changes:
+    name: Changes
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      pull-requests: read
+    outputs:
+      rust: ${{ steps.classify.outputs.rust }}
+      frontend: ${{ steps.classify.outputs.frontend }}
+    steps:
+      - id: classify
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR: ${{ github.event.pull_request.number }}
+        run: |
+          set -euo pipefail
+          if [ "$GITHUB_EVENT_NAME" != pull_request ]; then
+            echo "rust=true" >> "$GITHUB_OUTPUT"
+            echo "frontend=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          gh api --paginate "repos/$GITHUB_REPOSITORY/pulls/$PR/files" \
+            --jq '.[] | .filename, (.previous_filename // empty)' > files.txt
+          cat files.txt
+          docs='^(docs/|\.agents/|\.claude/|\.idea/|\.github/ISSUE_TEMPLATE/|\.github/pull_request_template\.md$|[^/]+\.md$|LICENSE$|NOTICE$)'
+          # Frontend-only paths. The Rust code embeds a few files under src/; those stay out.
+          web='^(src/|e2e/|perf/|public/|scripts/|smoke/|index\.html$|vite\.config\.ts$|tsconfig[^/]*\.json$|knip\.ts$|playwright\.config\.ts$|\.oxlintrc\.json$|\.oxfmtrc\.json$)'
+          embedded='^src/(bindings\.ts|styles/tokens\.css|features/plugins/views/frame-bridge\.js|platform/keymaps/)'
+          # A job runs when any changed file falls outside the paths that can't affect it.
+          rust=false
+          if grep -Ev "$docs|$web" files.txt | grep -q . || grep -Eq "$embedded" files.txt; then rust=true; fi
+          frontend=false
+          if grep -Ev "$docs" files.txt | grep -q .; then frontend=true; fi
+          echo "rust=$rust frontend=$frontend"
+          echo "rust=$rust" >> "$GITHUB_OUTPUT"
+          echo "frontend=$frontend" >> "$GITHUB_OUTPUT"
+
   rust:
     name: Rust (${{ matrix.os }})
+    needs: changes
+    if: needs.changes.outputs.rust == 'true'
+    timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:
         os: [macos-latest, ubuntu-22.04, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: pnpm/action-setup@v4
+      - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v5
         with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         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'
@@ -45,27 +98,134 @@ 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)
+    needs: changes
+    if: needs.changes.outputs.rust == 'true'
+    timeout-minutes: 40
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v5
+      - 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
+
+  # The plugin SDK, the official plugins and the test fixtures build in their
+  # own workspaces (the root excludes them), so the jobs above don't see them.
+  plugins:
+    name: Plugins (SDK, official, fixtures)
+    needs: changes
+    if: needs.changes.outputs.rust == 'true'
+    timeout-minutes: 30
+    runs-on: ubuntu-22.04
+    env:
+      CARGO_TARGET_DIR: ${{ github.workspace }}/target-plugins
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+        with: { targets: wasm32-wasip2, components: "clippy, rustfmt" }
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: plugins
+          cache-directories: target-plugins
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Format, lint (host and wasm) and test each crate
+        shell: bash
+        run: |
+          set -euo pipefail
+          for dir in sdk/rust/openidea-plugin plugins/official/*/ crates/ide-plugin/tests/fixtures/*/; do
+            [ -f "$dir/Cargo.toml" ] || continue
+            echo "::group::$dir"
+            cargo fmt --check --manifest-path "$dir/Cargo.toml"
+            cargo clippy --locked --all-targets --manifest-path "$dir/Cargo.toml" -- -D warnings
+            cargo clippy --locked --target wasm32-wasip2 --manifest-path "$dir/Cargo.toml" -- -D warnings
+            cargo test --locked --manifest-path "$dir/Cargo.toml"
+            echo "::endgroup::"
+          done
+      - uses: pnpm/action-setup@v5
+        with: { version: 11 }
+      - uses: actions/setup-node@v5
+        with: { node-version: 22 }
+      # Plugin web pages (`web-src/`, their own pnpm projects): typecheck and test.
+      - name: Web pages typecheck and test
+        shell: bash
+        run: |
+          set -euo pipefail
+          for dir in plugins/official/*/web-src/; do
+            [ -f "$dir/package.json" ] || continue
+            echo "::group::$dir"
+            pnpm --dir "$dir" install --frozen-lockfile --ignore-workspace
+            pnpm --dir "$dir" exec tsc --noEmit
+            pnpm --dir "$dir" test
+            echo "::endgroup::"
+          done
+      # The host's tests run the checked-in components: they must be built from these sources.
+      # Web pages aren't checked in: this builds them and checks the result.
+      - name: Checked-in components are up to date, web pages build
+        run: plugins/build.sh --check
+
+  deny:
+    name: Cargo deny
+    needs: changes
+    if: needs.changes.outputs.rust == 'true'
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: taiki-e/install-action@cargo-deny
+      - run: cargo deny check
 
   frontend:
     name: Frontend
+    needs: changes
+    if: needs.changes.outputs.frontend == 'true'
+    timeout-minutes: 30
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
-      - uses: pnpm/action-setup@v4
+      - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v5
         with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with: { node-version: 22, cache: pnpm }
       - 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
+    needs: changes
+    if: needs.changes.outputs.frontend == 'true'
+    timeout-minutes: 30
+    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@v5
+      - uses: pnpm/action-setup@v5
+        with: { version: 11 }
+      - uses: actions/setup-node@v5
+        with: { node-version: 22, cache: pnpm }
+      - run: pnpm install --frozen-lockfile
       - run: pnpm e2e
-      - uses: actions/upload-artifact@v4
+        env:
+          HOME: /root
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: playwright-report

.github/workflows/cnb-mirror.yml

@@ -0,0 +1,52 @@
+name: CNB mirror
+
+# Copies a published release to cnb.cool/l0ng-ai/openidea, the updater's CNB source
+# (scripts/cnb-mirror.ts). Release runs it after publishing; run it by hand to mirror
+# an existing tag again. Skipped without the CNB_TOKEN secret.
+on:
+  workflow_call:
+    inputs:
+      tag: { type: string, required: true }
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Published release to mirror (e.g. v0.1.38)"
+        required: true
+
+permissions:
+  contents: read
+
+concurrency:
+  group: cnb-mirror-${{ inputs.tag }}
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    env:
+      TAG: ${{ inputs.tag }}
+      CNB_TOKEN: ${{ secrets.CNB_TOKEN }}
+      GH_TOKEN: ${{ github.token }}
+    steps:
+      - name: Check token
+        id: token
+        run: |
+          if [ -z "$CNB_TOKEN" ]; then
+            echo "::notice::CNB_TOKEN unset: not mirroring $TAG"
+            echo "skip=true" >> "$GITHUB_OUTPUT"
+          fi
+      - uses: actions/checkout@v5
+        if: steps.token.outputs.skip != 'true'
+        with: { sparse-checkout: scripts }
+      - uses: actions/setup-node@v5
+        if: steps.token.outputs.skip != 'true'
+        with: { node-version: 22 }
+      - name: Download release
+        if: steps.token.outputs.skip != 'true'
+        run: |
+          gh release download "$TAG" -R "$GITHUB_REPOSITORY" -D assets
+          gh release view "$TAG" -R "$GITHUB_REPOSITORY" --json body,isPrerelease > assets/release.json
+          du -sh assets
+      - name: Upload to CNB
+        if: steps.token.outputs.skip != 'true'
+        run: node scripts/cnb-mirror.ts "$TAG" assets

.github/workflows/language-smoke.yml

@@ -0,0 +1,125 @@
+name: Language smoke
+# Everyday code intelligence (completion, go to definition, Find Usages, hover, diagnostics
+# with a quick fix, an intention, formatting, rename) per language, against the language
+# server the app starts by default: crates/ide-host/tests/language_smoke.rs.
+# Opening the fixture with its build tool and SDK (Maven / Gradle sync, the virtualenv, the
+# JDK): the ignored tests of crates/ide-host/tests/project_smoke.rs.
+# Then running and testing each fixture through the run store and openidea-server
+# (Run, Run tests, the test tree, Rerun Failed Tests): smoke/run.test.ts; and debugging its
+# entry point with the debugger the IDE installs (breakpoint, frames, variables, evaluate,
+# Step Over, Resume): smoke/debug.test.ts.
+on:
+  push:
+    branches: [main]
+    paths: &paths
+      - "crates/**"
+      - "languages/**"
+      - "fixtures/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "src/features/run/**"
+      - "src/features/debugger/**"
+      - "src/platform/**"
+      - "smoke/**"
+      - "package.json"
+      - "pnpm-lock.yaml"
+      - ".github/workflows/language-smoke.yml"
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize, reopened]
+    paths: *paths
+  workflow_dispatch:
+
+concurrency:
+  group: language-smoke-${{ github.ref }}
+  # A new push supersedes a PR's run; on main every merge runs to the end (and saves the cache).
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_INCREMENTAL: 0
+  # Pinned so a server release can't fail an unrelated PR; bump them deliberately.
+  VTSLS: 0.3.0
+  TYPESCRIPT: 6.0.3
+  BASEDPYRIGHT: 1.40.2
+  RUFF: 0.17.3
+  GOPLS: v0.24.0
+  JDTLS: 1.63.0-202610191322
+  KOTLIN_LSP: 263.7084.0
+  GRADLE: 8.14.3
+
+jobs:
+  smoke:
+    name: Language smoke (${{ matrix.language }})
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [typescript, python, rust, go, java, kotlin]
+    runs-on: ubuntu-22.04
+    timeout-minutes: 40
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with: { components: "rust-analyzer, rustfmt" }
+      # One build cache for every language; main saves it.
+      - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: language-smoke
+          save-if: ${{ github.ref == 'refs/heads/main' && matrix.language == 'rust' }}
+
+      - uses: pnpm/action-setup@v4
+        with: { version: 11 }
+      - uses: actions/setup-node@v4
+        with: { node-version: 22, cache: pnpm }
+      - if: matrix.language == 'typescript'
+        run: npm install --global "@vtsls/language-server@$VTSLS" "typescript@$TYPESCRIPT"
+
+      - if: matrix.language == 'python'
+        uses: actions/setup-python@v5
+        with: { python-version: "3.12" }
+      - if: matrix.language == 'python'
+        run: pip install "basedpyright==$BASEDPYRIGHT" "ruff==$RUFF"
+
+      - if: matrix.language == 'go'
+        uses: actions/setup-go@v5
+        with: { go-version: "1.27", cache: false }
+      - if: matrix.language == 'go'
+        run: go install "golang.org/x/tools/gopls@$GOPLS"
+
+      - if: matrix.language == 'java' || matrix.language == 'kotlin'
+        uses: actions/setup-java@v4
+        with: { distribution: temurin, java-version: "21" }
+      - if: matrix.language == 'java'
+        run: |
+          mkdir -p "$RUNNER_TEMP/jdtls"
+          curl -fsSL "https://download.eclipse.org/jdtls/milestones/${JDTLS%-*}/jdt-language-server-$JDTLS.tar.gz" \
+            | tar xz -C "$RUNNER_TEMP/jdtls"
+          echo "$RUNNER_TEMP/jdtls/bin" >> "$GITHUB_PATH"
+
+      # The Kotlin fixture has no Gradle wrapper: the server imports it with the Gradle on PATH.
+      - if: matrix.language == 'kotlin'
+        uses: gradle/actions/setup-gradle@v4
+        with: { gradle-version: "${{ env.GRADLE }}" }
+      - if: matrix.language == 'kotlin'
+        run: |
+          mkdir -p "$RUNNER_TEMP/kotlin-lsp" "$RUNNER_TEMP/bin"
+          curl -fsSL "https://download.jetbrains.com/language-server/kotlin-server/$KOTLIN_LSP/kotlin-server-$KOTLIN_LSP.tar.gz" \
+            | tar xz -C "$RUNNER_TEMP/kotlin-lsp" --strip-components=1
+          ln -s "$RUNNER_TEMP/kotlin-lsp/kotlin-lsp.sh" "$RUNNER_TEMP/bin/kotlin-lsp"
+          echo "$RUNNER_TEMP/bin" >> "$GITHUB_PATH"
+
+      - run: cargo test --locked -p ide-host --test language_smoke --no-run
+      - run: cargo test --locked -p ide-host --test language_smoke -- --ignored --exact ${{ matrix.language }}
+      - if: matrix.language == 'java'
+        run: cargo test --locked -p ide-host --test project_smoke -- --ignored --exact maven_sync jdk
+      - if: matrix.language == 'kotlin'
+        run: cargo test --locked -p ide-host --test project_smoke -- --ignored --exact gradle_sync
+      - if: matrix.language == 'python'
+        run: cargo test --locked -p ide-host --test project_smoke -- --ignored --exact python_venv
+
+      - run: pnpm install --frozen-lockfile
+      - run: cargo build --locked -p ide-host --bin openidea-server
+      - run: pnpm smoke smoke/run.test.ts -t "^${{ matrix.language }}$"
+      - run: pnpm smoke smoke/debug.test.ts -t "^${{ matrix.language }}$"
+        # The IDE installs the debugger from GitHub releases: authenticated, against rate limits.
+        env: { GITHUB_TOKEN: "${{ github.token }}" }

.github/workflows/plugins-index.yml

@@ -0,0 +1,46 @@
+name: Plugin index
+
+# Refreshes the community plugins in the latest release's plugins-index.json
+# (what released apps read) from the registry, l0ng-ai/openidea-plugins. The
+# official plugins, their key and revocations stay as the release wrote them.
+on:
+  schedule:
+    - cron: "17 * * * *"
+  workflow_dispatch:
+  # Sent by the registry when its index changes.
+  repository_dispatch:
+    types: [community-plugins]
+
+permissions:
+  contents: write
+
+concurrency:
+  group: plugins-index
+
+env:
+  COMMUNITY_PLUGINS_INDEX: https://github.com/l0ng-ai/openidea-plugins/releases/download/index/index.json
+
+jobs:
+  merge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Merge the community index
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          cd "$RUNNER_TEMP"
+          tag="$(gh release view --repo "$GITHUB_REPOSITORY" --json tagName -q .tagName)"
+          tool=openidea-plugin-linux-x86_64
+          if ! gh release download "$tag" --repo "$GITHUB_REPOSITORY" -p plugins-index.json -p "$tool.gz"; then
+            echo "::notice::$tag has no plugin index or openidea-plugin tool yet"
+            exit 0
+          fi
+          gunzip "$tool.gz" && chmod +x "$tool"
+          cp plugins-index.json before.json
+          "./$tool" merge plugins-index.json "$COMMUNITY_PLUGINS_INDEX" --keep openidea
+          if cmp -s before.json plugins-index.json; then
+            echo "unchanged"
+          else
+            gh release upload "$tag" plugins-index.json --repo "$GITHUB_REPOSITORY" --clobber
+          fi

.github/workflows/pr-check.yml

@@ -0,0 +1,60 @@
+name: PR check
+on:
+  # pull_request_target so the check can label PRs from forks. It never checks out
+  # or runs PR code: it only reads the PR title and description.
+  pull_request_target:
+    types: [opened, edited, reopened, ready_for_review]
+
+permissions:
+  issues: write
+  pull-requests: write
+
+concurrency:
+  group: pr-check-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    if: github.event.pull_request.user.type != 'Bot' && !github.event.pull_request.draft
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v8
+        with:
+          script: |
+            const pr = context.payload.pull_request;
+            const LABEL = 'needs-info';
+            const MARKER = '<!-- pr-check -->';
+            const body = (pr.body || '').replace(/<!--[\s\S]*?-->/g, '');
+            const problems = [];
+
+            const verified = body.match(/^##+\s*How it was verified\s*$([\s\S]*?)(?=^##+\s|(?![\s\S]))/im);
+            if (!verified || !verified[1].trim()) {
+              problems.push('Fill in **How it was verified**: the commands you ran and their results. UI changes need before/after screenshots.');
+            }
+
+            const { owner, repo } = context.repo;
+            const issue_number = pr.number;
+            const comments = await github.paginate(github.rest.issues.listComments, { owner, repo, issue_number });
+            const existing = comments.find(c => c.user.type === 'Bot' && c.body.includes(MARKER));
+            const labeled = pr.labels.some(l => l.name === LABEL);
+
+            if (problems.length) {
+              const text = `${MARKER}\nThanks for the PR. Before review, please update the description (see [CONTRIBUTING.md](https://github.com/${owner}/${repo}/blob/main/CONTRIBUTING.md)):\n\n${problems.map(p => `- ${p}`).join('\n')}\n\nThis check reruns when you edit the description.`;
+              if (existing) {
+                await github.rest.issues.updateComment({ owner, repo, comment_id: existing.id, body: text });
+              } else {
+                await github.rest.issues.createComment({ owner, repo, issue_number, body: text });
+              }
+              if (!labeled) {
+                await github.rest.issues.addLabels({ owner, repo, issue_number, labels: [LABEL] });
+              }
+              return;
+            }
+
+            // Only undo what this check did: the label is cleared only when our comment exists.
+            if (existing) {
+              await github.rest.issues.deleteComment({ owner, repo, comment_id: existing.id });
+              if (labeled) {
+                await github.rest.issues.removeLabel({ owner, repo, issue_number, name: LABEL }).catch(() => {});
+              }
+            }

.github/workflows/release.yml

@@ -18,6 +18,7 @@ env:
   CARGO_TERM_COLOR: always
   CARGO_INCREMENTAL: 0
   TAG: ${{ github.event.inputs.tag || github.ref_name }}
+  COMMUNITY_PLUGINS_INDEX: https://github.com/l0ng-ai/openidea-plugins/releases/download/index/index.json
 
 jobs:
   # Creates (or reuses) one draft release that every platform build uploads into.
@@ -25,8 +26,9 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       release_id: ${{ steps.release.outputs.id }}
+      official_plugin_keys: ${{ steps.plugin-keys.outputs.keys }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with: { ref: "${{ env.TAG }}" }
       - name: Tag matches app version
         run: |
@@ -35,8 +37,32 @@ jobs:
             echo "::error::tag $TAG does not match tauri.conf.json version $app"
             exit 1
           fi
+      # A shipped plugin API is frozen: its WIT must be the snapshot api_frozen.rs checks later
+      # versions against (plugins/README.md, "Evolving the plugin API").
+      - name: Plugin API snapshot matches wit/
+        run: |
+          api() { sed -n 's/^package openidea:plugin@\(.*\);$/\1/p' "$1/plugin.wit"; }
+          snapshot=sdk/rust/openidea-plugin/tests/api/released
+          if [ "$(api wit)" != "$(api "$snapshot")" ]; then
+            echo "::error::plugin API $(api wit) ships without a snapshot ($snapshot is $(api "$snapshot")): copy wit/*.wit to $snapshot/"
+            exit 1
+          fi
+      # The official plugins' public key (from PLUGIN_SIGNING_KEY, the seed
+      # `openidea-plugin keygen` writes), built into the app: their packages
+      # must carry its signature whatever the marketplace index lists. Without
+      # the secret the app takes the index's word, as development builds do.
+      - id: plugin-keys
+        env:
+          SIGNING_KEY: ${{ secrets.PLUGIN_SIGNING_KEY }}
+        run: |
+          if [ -n "$SIGNING_KEY" ]; then
+            seed="$(printf %s "$SIGNING_KEY" | base64 -d | od -An -tx1 | tr -d ' \n')"
+            key="$(printf '302e020100300506032b657004220420%s' "$seed" | xxd -r -p |
+              openssl pkey -inform DER -pubout -outform DER | tail -c 32 | base64)"
+            echo "keys=$key" >> "$GITHUB_OUTPUT"
+          fi
       - id: release
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const tag = process.env.TAG;
@@ -57,6 +83,8 @@ jobs:
   build:
     needs: create-release
     name: Build (${{ matrix.name }})
+    env:
+      OPENIDEA_OFFICIAL_PLUGIN_KEYS: ${{ needs.create-release.outputs.official_plugin_keys }}
     strategy:
       fail-fast: false
       matrix:
@@ -70,16 +98,22 @@ 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
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with: { ref: "${{ env.TAG }}" }
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v5
         with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with: { node-version: 22, cache: pnpm }
       - uses: dtolnay/rust-toolchain@stable
         with: { targets: "${{ matrix.target }}" }
@@ -117,6 +151,8 @@ jobs:
           releaseId: ${{ needs.create-release.outputs.release_id }}
           tagName: ${{ env.TAG }}
           args: --target ${{ matrix.target }}
+          # The parallel builds would race on one latest.json; `updater-manifest` writes it once.
+          uploadUpdaterJson: false
       # tauri-action notarizes the .app but not the DMG around it; notarize and
       # staple the DMG too, then replace the uploaded asset.
       - name: Notarize DMG
@@ -130,12 +166,210 @@ jobs:
             xcrun stapler staple "$dmg"
             gh release upload "$TAG" "$dmg" --clobber
           done
+      # Portable Windows builds (#1857): on Windows Tauri embeds the
+      # frontend in the exe and WebView2 is a system component, so zipping
+      # the raw exe gives an unpack-and-run alternative to the installers.
+      - name: Portable zip
+        if: runner.os == 'Windows'
+        shell: pwsh
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          $target = "${{ matrix.target }}"
+          $arch = if ($target -like "x86_64*") { "x64" } else { "arm64" }
+          $version = $env:TAG -replace '^v', ''
+          $asset = "OpenIDEA_${version}_windows_${arch}_portable.zip"
+          $dir = "target/$target/release"
+          $files = @("$dir/openidea.exe")
+          if (Test-Path "$dir/WebView2Loader.dll") {
+            $files += "$dir/WebView2Loader.dll"
+          }
+          Compress-Archive -Path $files -DestinationPath $asset -Force
+          $hash = (Get-FileHash $asset -Algorithm SHA256).Hash.ToLower()
+          "$hash  $asset" | Out-File -Encoding ascii "$asset.sha256"
+          gh release upload $env:TAG $asset "$asset.sha256" --clobber
 
-  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: ${{ matrix.runner }}
+    steps:
+      - uses: actions/checkout@v5
+        with: { ref: "${{ 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 official plugins, signed, and the marketplace index released apps read
+  # (releases/latest/download/plugins-index.json). They are not in the
+  # installers: users install them from Settings › Plugins. Without the
+  # signing key (secret PLUGIN_SIGNING_KEY: the file `openidea-plugin keygen`
+  # writes) nothing is published and the release goes on. The index also lists
+  # the community plugins of the registry (COMMUNITY_PLUGINS_INDEX; refreshed
+  # between releases by plugins-index.yml), and the release carries the
+  # openidea-plugin tool for Linux x64, which that workflow and the registry's
+  # checks run.
+  plugins:
+    needs: create-release
+    name: Official plugins
+    runs-on: ubuntu-22.04
+    env:
+      SIGNING_KEY: ${{ secrets.PLUGIN_SIGNING_KEY }}
+    steps:
+      - id: key
+        run: |
+          if [ -z "$SIGNING_KEY" ]; then
+            echo "::warning::PLUGIN_SIGNING_KEY is not set: the official plugins are not published"
+            echo "skip=true" >> "$GITHUB_OUTPUT"
+          fi
+      - uses: actions/checkout@v5
+        if: steps.key.outputs.skip != 'true'
+        with: { ref: "${{ env.TAG }}" }
+      - uses: dtolnay/rust-toolchain@stable
+        if: steps.key.outputs.skip != 'true'
+        with: { targets: wasm32-wasip2 }
+      - uses: Swatinem/rust-cache@v2
+        if: steps.key.outputs.skip != 'true'
+        with: { key: release-plugins }
+      - uses: pnpm/action-setup@v5
+        if: steps.key.outputs.skip != 'true'
+        with: { version: 11 }
+      - uses: actions/setup-node@v5
+        if: steps.key.outputs.skip != 'true'
+        with: { node-version: 22 }
+      # Builds the web pages; fails when a checked-in component isn't built from these sources.
+      - name: Build
+        if: steps.key.outputs.skip != 'true'
+        run: |
+          plugins/build.sh --check
+          cargo build --release --locked -p ide-host --bin openidea-plugin
+      - name: Pack, index and upload
+        if: steps.key.outputs.skip != 'true'
+        shell: bash
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          tool="$PWD/target/release/openidea-plugin"
+          key="$RUNNER_TEMP/openidea.key"
+          out="$RUNNER_TEMP/market"
+          (umask 077 && printf '%s' "$SIGNING_KEY" > "$key")
+          trap 'rm -f "$key"' EXIT
+          mkdir -p "$out"
+          for dir in plugins/official/*/; do
+            id="$(sed -n 's/^id *= *"\(.*\)".*/\1/p' "$dir/plugin.toml" | head -1)"
+            version="$(sed -n 's/^version *= *"\(.*\)".*/\1/p' "$dir/plugin.toml" | head -1)"
+            "$tool" pack "$dir" --key "$key" --publisher openidea --out "$out/$id-$version.oiplugin"
+          done
+          # The published index's revocations, earlier keys and community plugins carry over.
+          curl -fsSL "https://github.com/$GITHUB_REPOSITORY/releases/latest/download/plugins-index.json" \
+            -o "$out/plugins-index.json" || rm -f "$out/plugins-index.json"
+          # Downloads point at this release: older versions kept for older IDEs stay where they were published.
+          "$tool" index "$out" --publisher openidea --name OpenIDEA --key "$key" --out "$out/plugins-index.json" \
+            --download-base "https://github.com/$GITHUB_REPOSITORY/releases/download/$TAG"
+          "$tool" merge "$out/plugins-index.json" "$COMMUNITY_PLUGINS_INDEX" --keep openidea ||
+            echo "::warning::the community plugins were not refreshed"
+          gzip -9 -c "$tool" > "$out/openidea-plugin-linux-x86_64.gz"
+          gh release upload "$TAG" "$out"/*.oiplugin "$out/plugins-index.json" \
+            "$out/openidea-plugin-linux-x86_64.gz" --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
+      - uses: actions/github-script@v8
+        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, plugins, updater-manifest]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v8
         env:
           RELEASE_ID: ${{ needs.create-release.outputs.release_id }}
         with:
@@ -143,3 +377,10 @@ jobs:
             await github.rest.repos.updateRelease({
               ...context.repo, release_id: Number(process.env.RELEASE_ID), draft: false,
             });
+
+  # The China mirror the updater's CNB source reads; a failure here leaves the GitHub release as is.
+  cnb-mirror:
+    needs: publish
+    uses: ./.github/workflows/cnb-mirror.yml
+    with: { tag: "${{ github.event.inputs.tag || github.ref_name }}" }
+    secrets: inherit

.gitignore

@@ -10,6 +10,9 @@ lerna-debug.log*
 node_modules
 dist
 dist-ssr
+# Plugin components are checked in (plugins/build.sh --check keeps them current).
+!plugins/official/*/dist
+!crates/ide-plugin/tests/fixtures/*/dist
 *.local
 
 # Editor directories and files
@@ -30,6 +33,13 @@ target/
 test-results/
 playwright-report/
 
-# Local AI agent files
-CLAUDE.md
-.claude/
+# Local AI agent files. Shared skills live in .agents/skills; .claude/skills links to them.
+CLAUDE.local.md
+.claude/*
+!.claude/skills/
+.claude/skills/*
+!.claude/skills/verify
+!.claude/skills/issue-fix
+
+# Local reference screenshots
+pycharm-screenshots/

.oxfmtrc.json

@@ -0,0 +1,31 @@
+{
+  "$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",
+    "src/editor/core/cm/jsp/parser*.ts",
+    "src/editor/core/cm/astro/parser*.ts",
+    "docs/plugins/themes.md",
+    "pnpm-lock.yaml",
+    "**/*.toml",
+    "fixtures",
+    "plugins/*/web",
+    "plugins/official/*/web",
+    "crates/**/tests/fixtures"
+  ],
+  "overrides": [
+    {
+      "files": ["**/*.md"],
+      "options": {
+        "embeddedLanguageFormatting": "off"
+      }
+    }
+  ]
+}

.oxlintrc.json

@@ -0,0 +1,152 @@
+{
+  "$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",
+    "src/editor/core/cm/astro/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" }

AGENTS.md

@@ -0,0 +1,132 @@
+# OpenIDEA — contributor guide
+
+Rust + Tauri 2 desktop IDE with full-featured, multi-language code intelligence.
+Visual style: dark, low-contrast greys, one cool accent
+(`src/styles/tokens.css` is the source of truth for colours and metrics).
+
+## Layout
+
+- `crates/ide-*` — backend crates; one domain each. Depend on `ide-core` for shared
+  types; never reach into another crate's internals.
+- `src-tauri/` — glue only: `state.rs` (AppState / Project), `commands/<domain>.rs`
+  (thin typed IPC adapters), `events.rs`. No domain logic here.
+- `src/bindings.ts` — generated by tauri-specta (`pnpm gen:bindings`). Never edit.
+- `src/platform/` — ipc (`call`, `onIdeEvent`, `nextRequestId`), actions registry,
+  keymap + dispatcher, context keys / `when` clauses, project store.
+- `src/workbench/contributions.ts` — extension points (tool windows, status items,
+  overlays, editor kinds) and cross-feature services (editor, tool windows, notifications).
+- `src/ui/` — design-system primitives. `src/features/<name>/` — one feature each,
+  exporting `activate()` registered in `src/features/index.ts`.
+- `languages/<id>.toml` — language definitions (detection, comments, LSP, DAP).
+- `crates/ide-host` — the `openidea-server` binary for remote development and the
+  `openidea-plugin` CLI (plugin starter templates live in its `templates.rs`).
+- `wit/` — plugin interface definitions; `plugins/` — sample and bundled plugins.
+  Plugin docs: `plugins/README.md`, `docs/plugins/themes.md`.
+- `java/` — JDT LS extension bundles (`java-usages`, `kotlin-bridge`) and the patched
+  Lombok agent, embedded into the app by `ide-sdk` / `ide-tools`.
+- `e2e/` — Playwright UI tests (`pnpm e2e`). `fixtures/` — sample projects per language
+  for manual and automated testing.
+
+## Rules
+
+- IPC coordinates: 0-based lines, **UTF-16** columns/offsets everywhere (`ide-core::text`).
+- Every command returns `IdeResult<T>`; convert internal errors at the crate edge.
+- Streaming → `tauri::ipc::Channel<T>`; cancellable → UI-allocated `RequestId` +
+  `cancel_request`. Backend → UI notifications → `IdeEvent` via `EventSink`.
+- Long work never blocks the UI thread or a Tauri command thread: use
+  `spawn_blocking`/rayon, honour `CancellationToken`.
+- Frontend features never import each other; communicate via actions, contributions
+  and services. All user-invocable behaviour is an action with a stable id; default
+  shortcuts live in `src/platform/keymaps/`.
+- Styling: CSS Modules + tokens only (no hex literals in components). Inline SVG
+  icons from `src/ui/icons.tsx`, never emoji. Real `<button>`/`<input>`; `aria-label` on icon buttons.
+- User-visible text goes through the text catalog: add every new string to both
+  `src/platform/locales/text/en.json` and `zh.json` (`textCatalog.test.ts` enforces it).
+  Other locales may lack entries; their UI shows the English text until a translator adds it.
+- Keep comments sparse and purposeful; match surrounding style.
+- For GUI verification, prefer Tauri MCP; use Computer Use only when Tauri MCP is
+  unavailable or cannot cover the required checks.
+
+## Issues & PRs
+
+Follow `CONTRIBUTING.md` and `.github/pull_request_template.md`: one problem per PR
+(`Closes #<n>` when it resolves an issue), reproduce first, keep the diff focused, short plain description, and a
+**How it was verified** section with commands run, results and, when the change alters what users
+see, before/after screenshots (not for UI removed along with a feature, copy-only or non-visual changes).
+Unclear product decisions → `needs-decision` and stop.
+
+## Skills
+
+Shared agent skills live in `.agents/skills/` (`.claude/skills/` links to them):
+`verify` drives the running app through Tauri MCP and captures screenshot evidence;
+`issue-fix` takes an issue from reproduction to one PR.
+
+## Commands
+
+- `pnpm tauri dev` — run the app with worktree isolation (Node 22.18+).
+  `pnpm dev:app` also enables the global Tauri API. `pnpm dev:status` reports
+  this worktree's running MCP bridges and actual ports.
+- `pnpm build` — typecheck + bundle frontend.
+- `cargo nextest run --workspace` (or `cargo test`), `cargo clippy --workspace --all-targets -- -D warnings`, `cargo fmt --all`.
+- `cargo test -p ide-host --test language_smoke -- --ignored --exact <language>` — code intelligence
+  on `fixtures/` with that language's real server installed (CI: `Language smoke`, pinned versions).
+- `pnpm smoke smoke/run.test.ts -t <language>` — run and test that language's fixture through the
+  run store and a real `openidea-server` (build it first: `cargo build -p ide-host --bin openidea-server`).
+- `pnpm smoke smoke/debug.test.ts -t <language>` — debug that fixture's entry point the same way, with
+  the debugger the IDE installs (on macOS, CodeLLDB and Delve may need Developer Mode:
+  `sudo DevToolsSecurity -enable`).
+- `pnpm test`, `pnpm e2e`, `pnpm lint`, `pnpm format:check`, `pnpm knip`, `pnpm typecheck`,
+  `pnpm gen:bindings`.
+- `pnpm perf` (UI interaction latency / frames / leaks), `pnpm perf:rust` (criterion
+  benches vs budgets). Budgets: `perf/budgets.json`.
+- `pnpm release:prepare <version>` — the release commit's changes: app version everywhere,
+  `Cargo.lock`, and the plugin API snapshot when `wit/` moved to a new version.
+
+## Before opening a PR
+
+Run what CI runs for the parts you touched:
+
+- Rust: `cargo fmt --all --check`, `cargo clippy --workspace --all-targets -- -D warnings`,
+  `cargo nextest run --workspace`. After changing IPC types, run `pnpm gen:bindings` and
+  commit `src/bindings.ts`; CI fails if it differs.
+- Frontend: `pnpm typecheck`, `pnpm lint`, `pnpm format:check`, `pnpm knip`, `pnpm test`,
+  `pnpm build`, and `pnpm e2e` for UI flows.
+- UI or runtime behaviour: verify in the running app (`.agents/skills/verify`).
+
+## Pitfalls
+
+- Run a subset of frontend tests with `pnpm vitest run <path>`. `pnpm test -- <path>` ignores
+  the filter and runs the whole suite, which takes several minutes.
+- Don't run clippy while iterating: `pnpm tauri dev` compiles anyway. Run
+  `cargo fmt --all` + `cargo clippy -p <crate> --all-targets -- -D warnings` once, right
+  before committing. A cold build cache can take around 5 minutes. Run long checks one at
+  a time, not chained in one shell call that may hit the 10-minute tool timeout.
+- `pnpm tauri dev` does a full debug build. Clippy only checks the code, so a passing clippy
+  doesn't make the first launch fast.
+
+## Parallel worktrees
+
+Several worktrees can be developed and run side by side.
+
+- Create one per task: `git worktree add ../<name> -b <branch> origin/main`, then
+  `pnpm install` in it.
+- Launch with `pnpm tauri dev` / `pnpm dev:app`, not the raw `pnpm exec tauri dev` CLI. The
+  wrapper starts Vite on a worktree-derived port (advancing if occupied), passes its actual
+  URL to Tauri, and reports an existing launcher instead of starting another for the same
+  worktree. HMR uses the Vite port.
+- Debug app identity, data, settings, logs and single-instance scope follow the canonical
+  worktree path captured at build time, independent of launch cwd. Launching the same debug
+  binary again focuses its existing instance and forwards its path argument. Different
+  worktrees and the installed release can coexist. `--release` uses normal release identity
+  and bypasses the development wrapper.
+- MCP bridge ports are dynamic (9223–9322). Use `pnpm dev:status`, connect to the reported
+  port, verify identifier/cwd, and pass `appIdentifier: <port>` explicitly. Do not assume the
+  default MCP session belongs to this worktree.
+- Keep each worktree's Cargo output directory separate; do not point `CARGO_TARGET_DIR` or
+  `target` symlinks at a shared directory.
+- Each worktree's first build is cold (several minutes) and `cargo build` output takes
+  around 9 GB; tests, clippy and incremental builds add more. Avoid running several heavy builds on one machine at the same time.
+- Stop only processes started for the current worktree/session. Never use broad
+  process-name kills such as `pkill openidea`.
+- When done: stop that worktree's app and dev session, delete its build output, then
+  `git worktree remove ../<name>`.

CLAUDE.md

@@ -0,0 +1 @@
+AGENTS.md

CONTRIBUTING.md

@@ -0,0 +1,39 @@
+# Contributing to OpenIDEA
+
+These rules apply to everyone, and to any coding agent working on their behalf.
+Project layout, coding rules, commands and checks are in [AGENTS.md](AGENTS.md).
+
+## Issues
+
+- One problem or request per issue. Use the issue forms.
+- Bugs: steps that reproduce the problem from a fresh start. A minimal sample
+  project is the fastest way to get a fix.
+- Features: state the problem and the acceptance criteria. A feature is ready to
+  build once a maintainer labels it `planned`.
+- Labels track status: `needs-info` waits on the reporter, `needs-decision` waits
+  on a maintainer, `planned` is accepted, `needs-acceptance` has a fix waiting to be
+  checked.
+
+## Pull requests
+
+- One problem per PR. If it resolves an issue, link it with `Closes #123`.
+- Reproduce the problem first, or write a test that fails before the fix.
+- Fix the cause, and check whether the same cause breaks anything nearby.
+- Keep the diff focused. Unrelated refactors go in their own PR.
+- Title: [Conventional Commits](https://www.conventionalcommits.org/), e.g.
+  `fix(editor): keep the caret visible after folding`.
+- Fill in the template. Keep the description short and in plain words. If it
+  doesn't fit in a few sentences, the PR is probably too big.
+- **How it was verified** is required: the commands you ran and their results,
+  and what else the change could affect. Changes to what users see need before/after
+  screenshots; multi-step interactions need a recording. UI that goes away with a removed
+  feature, copy-only and non-visual changes don't; say what you checked instead.
+- If a change needs a product decision you can't make, ask in the issue and stop
+  rather than guessing.
+
+Plugins: pull requests here add or change official plugins (`plugins/official/`)
+and the plugin API. Community plugins live in their authors' repositories and
+are listed through [l0ng-ai/openidea-plugins](https://github.com/l0ng-ai/openidea-plugins);
+see [`plugins/README.md`](plugins/README.md) § 8.1.
+
+A check on each PR adds `needs-info` when the verification section is missing, and removes it once it's filled in.

Cargo.toml

@@ -1,9 +1,11 @@
 [workspace]
 resolver = "3"
 members = ["crates/*", "src-tauri"]
+# Plugins and the guest SDK build for wasm32-wasip2 in their own workspaces.
+exclude = ["sdk", "plugins"]
 
 [workspace.package]
-version = "0.1.16"
+version = "0.1.38"
 edition = "2024"
 rust-version = "1.96"
 license = "Apache-2.0"
@@ -36,6 +38,13 @@ 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" }
+ide-extension = { path = "crates/ide-extension" }
+ide-plugin = { path = "crates/ide-plugin" }
 
 # serialization & IPC typing
 serde = { version = "1", features = ["derive"] }
@@ -43,6 +52,7 @@ 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"] }
@@ -63,31 +73,42 @@ ropey = "1.6"
 encoding_rs = "0.8"
 chardetng = "0.1"
 ignore = "0.4"
+base64 = "0.22"
 globset = "0.4"
 notify = "8"
-notify-debouncer-full = "0.6"
 trash = "5"
 blake3 = "1"
 dunce = "1"
 dirs = "6"
+zip = { version = "9", default-features = false, features = ["deflate"] }
 
 # search, index, language
 grep-searcher = "0.1"
 grep-regex = "0.1"
+regex-syntax = "0.8"
 grep-matcher = "0.1"
 nucleo-matcher = "0.3"
 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"] }
+oracle = { version = "0.6", default-features = false }
+bb8 = "0.9"
 uuid = { version = "1", features = ["v4"] }
+# OS credential stores
+keyring = "4.2"
+keyring-core = "1"
 
 # testing
 insta = { version = "1", features = ["yaml"] }
@@ -97,12 +118,20 @@ tempfile = "3"
 [profile.dev]
 # Keep debug builds snappy while giving dependencies decent speed.
 opt-level = 0
+# Full debug info is most of target/. Line tables keep file:line in our backtraces, but a
+# debugger can't show locals; re-enable with `--config profile.dev.debug=true`.
+debug = "line-tables-only"
 [profile.dev.package."*"]
 opt-level = 2
+# Dependency frames keep function names only. Re-enable one with
+# `--config 'profile.dev.package.<crate>.debug=true'`.
+debug = false
 
 [profile.release]
 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

@@ -14,7 +14,9 @@
    · 
   <a href="#benchmark">Benchmark</a>
   &nbsp;·&nbsp;
-  <a href="#build">Build</a>
+  <a href="#plugins">Plugins</a>
+  &nbsp;·&nbsp;
+  <a href="#community">Community</a>
 </p>
 
 https://github.com/user-attachments/assets/234dd54c-1255-4b3a-b35c-533d78d737c0
@@ -23,21 +25,23 @@ OpenIDEA brings the IntelliJ IDEA way of working — its keymap, its tool window
 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. Builds for macOS, Windows and Linux.
+for 60+ languages. Builds for macOS, Windows and Linux. On Windows, if you'd
+rather skip the installer, each release also ships a portable zip — unpack it
+and run `openidea.exe`.
 
 ## 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.
@@ -45,17 +49,35 @@ 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
+## Plugins
 
-```sh
-pnpm install
-pnpm tauri dev
-```
+Plugins add actions, completion, quick fixes, tool windows, custom editors,
+themes, file icons and languages. They run as sandboxed WebAssembly components;
+themes, icon themes and languages need no code at all.
 
-Rust 1.96, Node 22, pnpm and the [Tauri prerequisites](https://v2.tauri.app/start/prerequisites/).
+Install them from Settings › Plugins, or start your own with
+`openidea-plugin new` — see [Writing OpenIDEA plugins](plugins/README.md) and
+the [official plugins](plugins/official). The plugin API is still a preview.
+
+## Community
+
+- [Discord](https://discord.gg/2Zy4yn7gP) — questions, feedback and release news.
+- WeChat group — scan to join:
+
+  <img src="docs/assets/wechat-group.png" alt="WeChat group QR code" width="200">
+
+### Contributors
+
+<a href="https://github.com/l0ng-ai/openidea/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=l0ng-ai/openidea&max=100" alt="OpenIDEA contributors">
+</a>
 
 ## License
 
 [Apache 2.0](LICENSE). Bundled third-party assets are listed in [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md).
 
+Database tool window notes, including Oracle Instant Client setup, are in
+[`docs/databases.md`](docs/databases.md).
+Java language server choices and their capabilities are in [`docs/java.md`](docs/java.md).
+
 <sub>Not affiliated with JetBrains. IntelliJ IDEA is a trademark of JetBrains s.r.o.</sub>

THIRD_PARTY_LICENSES.md

@@ -1,5 +1,15 @@
 # Third-party licenses
 
+## Project Lombok
+
+`java/lombok/lombok-1.18.48-openidea.3.jar` contains Project Lombok v1.18.48 with the Equinox
+classloader fix from [projectlombok/lombok#4059](https://github.com/projectlombok/lombok/pull/4059),
+the [compact record constructor builder fix](java/lombok/patches/builder-compact-constructor.patch)
+and the ECJ constructor-call fix from [projectlombok/lombok#4089](https://github.com/projectlombok/lombok/pull/4089).
+Copyright (C) 2009-2021 The Project Lombok Authors. MIT license and bundled component
+notices are retained in [java/lombok/LICENSE](java/lombok/LICENSE) and inside the jar.
+Source tag, patch commits and build instructions: [java/lombok/README.md](java/lombok/README.md).
+
 ## JetBrains IntelliJ Platform icons
 
 `src/ui/expui/**` contains SVG icons from the IntelliJ Platform "new UI" (expui)
@@ -12,24 +22,67 @@ 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
   carries its own licence): `protobuf/protoeditor-core` (`newui/protoFile` →
   `fileTypes/protoFile`, Apache-2.0); `terraform` (`newui/hashiCorp` →
-  `fileTypes/hashiCorp`, Apache-2.0); `makefile` (`expui/makefile` →
+  `fileTypes/hashiCorp`, Apache-2.0); `Astro` (`icons/astro` → `fileTypes/astro`,
+  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 VCS log graph algorithms
+
+`crates/ide-vcs/src/bek.rs` and `src/features/vcs/graph.ts` adapt the Bek ordering,
+graph layout and LinearBek merge linearization algorithms from
+[intellij-community](https://github.com/JetBrains/intellij-community/tree/1d70d5c54302d655758edbd2f808fb8dea8b1764/platform/vcs-log/graph/src/com/intellij/vcs/log/graph)
+(`impl/facade/sort/bek`, `impl/permanent/GraphLayoutBuilder.kt` and
+`linearBek/LinearBekGraphBuilder.java`). Modified from the originals.
+Copyright 2000-2026 JetBrains s.r.o. and contributors. Apache License 2.0 (below).
+
+## 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/features/vcs/mergeDiff3.ts`, `chunkOptimizer.ts` and `mergeModel.ts` also adapt
+the IntelliJ Platform merge implementation (`MergeRangeUtil`, `MergeResolveUtil`,
+`ChunkOptimizer.LineChunkOptimizer` and `MergeConflictModel`). 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 +93,31 @@ 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
@@ -79,15 +157,37 @@ 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 Hunspell dictionary
+## 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`. It is checked with the
+`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`
@@ -106,7 +206,7 @@ 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
 
@@ -157,3 +257,124 @@ 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

@@ -6,9 +6,12 @@ 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
@@ -16,7 +19,9 @@ 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

@@ -1,9 +1,54 @@
 //! 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 crate::model::{
+    AgentCommand, AgentConfigOption, AgentConfigValue, AgentConfigVia, AgentCost, AgentLimit, 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> {
@@ -64,7 +109,7 @@ pub(crate) fn parse_options(options: &Value) -> Vec<AgentConfigOption> {
 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.via != AgentConfigVia::Option && !covered(o));
+    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);
@@ -104,17 +149,30 @@ pub(crate) fn commands_of(update: &Value) -> Vec<AgentCommand> {
         .collect()
 }
 
-/// `usage_update`: `{ used, size, cost?: { amount, currency } }`.
+/// `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);
-    let used = tokens("used")?;
-    let size = tokens("size").filter(|s| *s > 0)?;
-    Some(AgentUsage {
-        used,
-        size,
-        cost: update.pointer("/cost/amount").and_then(Value::as_f64),
-        currency: update.pointer("/cost/currency").and_then(Value::as_str).map(str::to_owned),
-    })
+    let cost = update.get("cost").and_then(|c| {
+        Some(Box::new(AgentCost {
+            amount: c.get("amount")?.as_f64().filter(|a| a.is_finite() && *a >= 0.0)?,
+            currency: c.get("currency")?.as_str().filter(|c| !c.is_empty())?.to_owned(),
+        }))
+    });
+    Some(AgentUsage { used: tokens("used")?, size: tokens("size").filter(|s| *s > 0)?, cost })
+}
+
+/// The usage-limit windows a [`crate::LIMITS_UPDATE`] carries; malformed entries are skipped.
+pub(crate) fn limits_of(update: &Value) -> Vec<AgentLimit> {
+    let limits = update.get("limits").and_then(Value::as_array).into_iter().flatten();
+    limits
+        .filter_map(|l| {
+            Some(AgentLimit {
+                window: l.get("window")?.as_str().filter(|w| !w.is_empty())?.to_owned(),
+                used_percent: l.get("usedPercent")?.as_f64().filter(|p| p.is_finite())?.clamp(0.0, 100.0),
+                resets_ms: l.get("resetsMs").and_then(Value::as_f64),
+            })
+        })
+        .collect()
 }
 
 fn legacy(
@@ -218,7 +276,7 @@ mod tests {
         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.cost, u.currency.as_deref()), (1200, Some(0.42), Some("USD")));
+        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

@@ -3,6 +3,7 @@
 use ide_core::IpcPath;
 use serde::{Deserialize, Serialize};
 use specta::Type;
+use std::collections::BTreeMap;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
 #[serde(rename_all = "camelCase")]
@@ -15,9 +16,28 @@ pub enum AgentStatus {
     /// 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,
+    /// It reports its background tasks and stops them one by one.
+    pub background_tasks: bool,
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
 #[serde(rename_all = "camelCase")]
 pub enum Isolation {
@@ -30,6 +50,9 @@ pub enum Isolation {
 #[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`].
@@ -44,7 +67,7 @@ pub struct AgentTask {
     pub branch: Option<String>,
     /// Branch (or revision) the worktree was created from.
     pub base: Option<String>,
-    /// Commit the task's changes are compared against.
+    /// 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>,
@@ -59,6 +82,42 @@ pub struct AgentTask {
     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>,
+    /// What the agent runs in the background (shells, subagents, monitors), oldest first.
+    // Boxed so that `AgentEvent::Task` stays within clippy's `large_enum_variant` bound on Windows.
+    #[serde(default)]
+    pub background: Box<Vec<AgentBackgroundTask>>,
+}
+
+/// A task the agent runs in the background while the conversation goes on.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentBackgroundTask {
+    pub id: String,
+    /// What it is, as the agent names it (`local_bash`, `local_agent`, `monitor`…).
+    pub kind: String,
+    pub description: String,
+    /// When the client first saw it (ms since the epoch).
+    pub started_ms: f64,
+}
+
+/// 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.
@@ -114,9 +173,30 @@ pub struct AgentUsage {
     pub used: u32,
     /// Size of the context window.
     pub size: u32,
-    /// Session cost so far.
-    pub cost: Option<f64>,
-    pub currency: Option<String>,
+    /// What the session has cost so far (ACP `usage_update.cost`), when the agent reports it.
+    // Boxed so that `AgentEvent::Task` stays within clippy's `large_enum_variant` bound on Windows.
+    #[serde(default)]
+    pub cost: Option<Box<AgentCost>>,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentCost {
+    pub amount: f64,
+    /// ISO 4217 code, e.g. `USD`.
+    pub currency: String,
+}
+
+/// One usage-limit window of an agent's account.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentLimit {
+    /// The window as the agent names it: `five_hour`, `seven_day`, `seven_day_opus`…
+    pub window: String,
+    /// Share of the window used, 0–100.
+    pub used_percent: f64,
+    /// When the window resets (ms since the epoch), if the agent said.
+    pub resets_ms: Option<f64>,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
@@ -169,6 +249,18 @@ pub struct AgentToolDiff {
     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 {
@@ -186,6 +278,28 @@ pub struct AgentPermissionOption {
     pub kind: String,
 }
 
+/// A question the agent asks with `AskUserQuestion`, answered by picking options or typing.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentQuestion {
+    #[serde(default)]
+    pub header: String,
+    pub question: String,
+    #[serde(default)]
+    pub multi_select: bool,
+    pub options: Vec<AgentQuestionOption>,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentQuestionOption {
+    pub label: String,
+    #[serde(default)]
+    pub description: String,
+    #[serde(default)]
+    pub preview: Option<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")]
@@ -194,6 +308,18 @@ pub enum AgentEntry {
         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,
@@ -215,10 +341,41 @@ pub enum AgentEntry {
     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>,
+        /// Set when the request asks `AskUserQuestion`'s questions; answered with a JSON object
+        /// of question to answer instead of an option.
+        #[serde(default)]
+        questions: Vec<AgentQuestion>,
         /// Name of the chosen option, or `None` while pending. Cancelled requests read "Cancelled".
         chosen: Option<String>,
     },
@@ -234,17 +391,74 @@ pub struct AgentProvider {
     pub name: String,
     /// The command line that starts its ACP server.
     pub command: String,
+    /// Executable and arguments actually launched, without flattening paths containing spaces.
+    pub program: String,
+    pub args: Vec<String>,
+    pub default_program: Option<String>,
+    pub default_args: Vec<String>,
+    pub login_hint: Option<String>,
+    pub command_overridden: bool,
+    pub command_editable: bool,
+    pub command_read_only_reason: Option<AgentCommandReadOnlyReason>,
     /// Whether the command was found (on `PATH`).
     pub installed: bool,
+    /// Environment variables it starts with (from its agent file).
+    pub env: BTreeMap<String, String>,
     /// 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,
+}
+
+/// Why the executable cannot be changed in built-in agent settings.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum AgentCommandReadOnlyReason {
+    PackageRunner,
+    Registry,
+    CustomAgent,
+}
+
+/// 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…).
@@ -276,10 +490,23 @@ pub enum AgentEvent {
     Removed {
         id: String,
     },
-    /// Entry `index` of `task` was added or replaced.
+    /// 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,
     },
+    /// An agent reported the usage limits of its account (shared by every task of `provider`).
+    Limits {
+        provider: String,
+        limits: Vec<AgentLimit>,
+    },
+    /// The installed or configured agent providers changed.
+    Providers,
 }

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

@@ -0,0 +1,163 @@
+//! 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());
+        // `claude` may be a wrapper (`claude.cmd` → node): stopping it stops what it started.
+        ide_core::process::own_group(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() => {
+                    if let Some(pid) = child.id() {
+                        let _ = tokio::task::spawn_blocking(move || ide_core::process::kill_tree_of(pid)).await;
+                    }
+                    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 +1,620 @@
+//! 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::{BACKGROUND_TASKS_UPDATE, LIMITS_UPDATE, 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>,
+    /// The session's cost so far in USD, as the last `result` reported it.
+    cost_usd: Option<f64>,
+}
+
+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(),
+            cost_usd: None,
+        }
+    }
+
+    /// 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))
+            }
+            // A turn's background tasks (`run_in_background`) outlive it: the task keeps
+            // the list and stays up while it isn't empty (see `Task::release_when_idle`).
+            Some("background_tasks_changed") => {
+                let Some(tasks) = msg.get("tasks").and_then(Value::as_array).cloned() else { return Vec::new() };
+                vec![Update {
+                    session: self.root.clone(),
+                    update: json!({ "sessionUpdate": BACKGROUND_TASKS_UPDATE, "tasks": tasks }),
+                }]
+            }
+            _ => 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);
+            }
+        }
+        if let Some(cost) = result.get("total_cost_usd").and_then(Value::as_f64).filter(|c| c.is_finite()) {
+            self.cost_usd = Some(cost);
+        }
+        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())?;
+        let mut update = json!({ "sessionUpdate": "usage_update", "used": used, "size": size });
+        if let Some(amount) = self.cost_usd {
+            update["cost"] = json!({ "amount": amount, "currency": "USD" });
+        }
+        Some(Update { session: self.root.clone(), update })
+    }
+
+    /// The usage-limit windows a `rate_limit_event` reports, as a [`LIMITS_UPDATE`]: every
+    /// window of `unifiedWindows`, or the single `rateLimitType` window older versions send.
+    pub fn on_rate_limit(&self, info: &Value) -> Option<Update> {
+        let window = |name: &str, w: &Value| {
+            let utilization = w.get("utilization")?.as_f64()?;
+            Some(json!({
+                "window": name,
+                "usedPercent": utilization * 100.0,
+                "resetsMs": w.get("resetsAt").and_then(Value::as_f64).map(|s| s * 1000.0),
+            }))
+        };
+        let limits: Vec<Value> = match info.get("unifiedWindows").and_then(Value::as_object) {
+            Some(windows) => windows.iter().filter_map(|(name, w)| window(name, w)).collect(),
+            None => {
+                info.get("rateLimitType").and_then(Value::as_str).and_then(|t| window(t, info)).into_iter().collect()
+            }
+        };
+        (!limits.is_empty()).then(|| Update {
+            session: self.root.clone(),
+            update: json!({ "sessionUpdate": LIMITS_UPDATE, "limits": limits }),
+        })
+    }
+}
+
+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

@@ -1,66 +1,233 @@
-//! Agents and how to launch their ACP servers: the built-in ones, plus user-defined
-//! agents from `<config>/agents/<id>.toml`.
+//! 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 serde::Deserialize;
-use std::collections::HashMap;
+use crate::{AgentCommandReadOnlyReason, AgentProvider, AgentSource};
+use ide_core::{IdeError, IdeResult};
+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, command line, sign-in hint)`. npm adapters are pinned so a session's
-/// protocol does not change under the user.
-const BUILTIN: &[(&str, &str, &[&str], &str)] = &[
+/// `(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",
-        "Claude Code",
+        "claude-acp",
+        "Claude Code (ACP)",
+        Driver::Acp,
         &["npx", "-y", "@agentclientprotocol/[email protected]"],
         "Run `claude` in a terminal and sign in.",
     ),
-    ("codex", "Codex", &["npx", "-y", "@zed-industries/[email protected]"], "Run `codex login` in a terminal."),
-    ("gemini", "Gemini CLI", &["gemini", "--experimental-acp"], "Run `gemini` in a terminal and sign in."),
-    ("copilot", "GitHub Copilot", &["copilot", "--acp"], "Run `copilot` in a terminal and sign in."),
-    ("cursor", "Cursor", &["cursor-agent", "acp"], "Run `cursor-agent login` in a terminal."),
-    ("opencode", "OpenCode", &["opencode", "acp"], "Run `opencode auth login` in a terminal."),
-    ("qwen", "Qwen Code", &["qwen", "--experimental-acp"], "Run `qwen` in a terminal and sign in."),
-    ("kimi", "Kimi CLI", &["kimi", "acp"], "Run `kimi` in a terminal and sign in."),
-    ("goose", "Goose", &["goose", "acp"], "Run `goose configure` in a terminal."),
-    ("auggie", "Auggie", &["auggie", "--acp"], "Run `auggie login` in a terminal."),
-    ("kiro", "Kiro", &["kiro-cli", "acp"], "Run `kiro-cli login` in a terminal."),
-    ("vibe", "Mistral Vibe", &["vibe-acp"], "Run `vibe` 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, cmd, hint)| ProviderSpec {
+        .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()
 }
 
-#[derive(Deserialize)]
+/// Whether `id` names a built-in agent that needs no registry install (native drivers
+/// and `npx -y` adapters). CLI built-ins (`copilot`, `gemini`, …) can be installed and
+/// updated from the ACP Registry into `<config>/agents/<id>.toml`.
+pub(crate) fn is_builtin(id: &str) -> bool {
+    BUILTIN.iter().any(|&(bid, _, driver, cmd, _)| bid == id && (driver != Driver::Acp || cmd.first() == Some(&"npx")))
+}
+
+/// Display name of a built-in agent, when `id` is one.
+pub(crate) fn builtin_name(id: &str) -> Option<&'static str> {
+    BUILTIN.iter().find(|&&(bid, _, _, _, _)| bid == id).map(|&(_, name, _, _, _)| name)
+}
+
+/// The built-in spec of `id`.
+pub(crate) fn builtin_spec(id: &str) -> Option<ProviderSpec> {
+    builtins().into_iter().find(|s| s.id == id)
+}
+
+/// Public launch metadata, keeping the built-in defaults separate from agent-file overrides.
+pub(crate) fn describe(spec: &ProviderSpec) -> AgentProvider {
+    let builtin = builtin_spec(&spec.id);
+    let reason = if matches!(spec.source, AgentSource::Registry { .. }) {
+        Some(AgentCommandReadOnlyReason::Registry)
+    } else if let Some(default) = &builtin {
+        matches!(default.command.as_str(), "npx" | "bunx" | "uvx").then_some(AgentCommandReadOnlyReason::PackageRunner)
+    } else {
+        Some(AgentCommandReadOnlyReason::CustomAgent)
+    };
+    AgentProvider {
+        id: spec.id.clone(),
+        name: spec.name.clone(),
+        command: std::iter::once(spec.command.as_str())
+            .chain(spec.args.iter().map(String::as_str))
+            .collect::<Vec<_>>()
+            .join(" "),
+        program: spec.command.clone(),
+        args: spec.args.clone(),
+        default_program: builtin.as_ref().map(|b| b.command.clone()),
+        default_args: builtin.as_ref().map(|b| b.args.clone()).unwrap_or_default(),
+        login_hint: Some(spec.login_hint.clone()),
+        command_overridden: builtin.as_ref().is_some_and(|b| b.command != spec.command),
+        command_editable: reason.is_none(),
+        command_read_only_reason: reason,
+        installed: installed(&spec.command),
+        env: spec.env.iter().cloned().collect(),
+        config: vec![],
+        commands: vec![],
+        source: spec.source.clone(),
+    }
+}
+
+/// Overrides built-in `id`'s command through its agent file, preserving other
+/// customizations. `None` restores the built-in command and removes a redundant file.
+pub(crate) fn set_builtin_command(custom_dir: &Path, id: &str, command: Option<&str>) -> IdeResult<()> {
+    update_builtin(custom_dir, id, |agent, builtin| agent.command = command.unwrap_or(&builtin.command).to_owned())
+}
+
+/// The environment built-in `id` starts with, through its agent file (empty clears it).
+pub(crate) fn set_builtin_env(custom_dir: &Path, id: &str, env: BTreeMap<String, String>) -> IdeResult<()> {
+    update_builtin(custom_dir, id, |agent, _| agent.env = env)
+}
+
+/// Changes built-in `id`'s agent file; a file left with only the built-in's values is removed.
+fn update_builtin(custom_dir: &Path, id: &str, change: impl FnOnce(&mut CustomAgent, &ProviderSpec)) -> IdeResult<()> {
+    let Some(builtin) = builtin_spec(id) else {
+        return Err(IdeError::invalid(format!("{id} is not a built-in agent")));
+    };
+    let file = custom_dir.join(format!("{id}.toml"));
+    let mut agent = if file.try_exists()? {
+        CustomAgent::read(&file).map_err(IdeError::invalid)?
+    } else {
+        CustomAgent {
+            name: Some(builtin.name.clone()),
+            driver: builtin.driver,
+            command: builtin.command.clone(),
+            args: builtin.args.clone(),
+            env: BTreeMap::new(),
+            registry: None,
+        }
+    };
+    if agent.registry.is_some() {
+        return Err(IdeError::invalid(format!("{id} is installed from the ACP Registry")));
+    }
+    change(&mut agent, &builtin);
+    if agent.command == builtin.command
+        && agent.name.as_deref() == Some(builtin.name.as_str())
+        && agent.driver == builtin.driver
+        && agent.args == builtin.args
+        && agent.env.is_empty()
+    {
+        match std::fs::remove_file(&file) {
+            Err(e) if e.kind() != std::io::ErrorKind::NotFound => return Err(e.into()),
+            _ => {}
+        }
+        return Ok(());
+    }
+    agent.write(&file)?;
+    Ok(())
+}
+
+/// An agent file, `<config>/agents/<id>.toml`.
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
-struct CustomAgent {
-    name: Option<String>,
-    command: String,
-    #[serde(default)]
-    args: Vec<String>,
-    #[serde(default)]
-    env: HashMap<String, String>,
+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
@@ -78,28 +245,36 @@ pub(crate) fn load(custom_dir: Option<&Path>) -> Vec<ProviderSpec> {
     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 parsed = 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()));
-        let agent = match parsed {
+        let agent = match CustomAgent::read(&path) {
             Ok(a) => a,
             Err(e) => {
                 tracing::warn!("skipping agent {}: {e}", path.display());
                 continue;
             }
         };
-        let mut env: Vec<(String, String)> = agent.env.into_iter().collect();
-        env.sort();
-        let spec = ProviderSpec {
+        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 mut 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,
+            Some(existing) => {
+                spec.login_hint = existing.login_hint.clone();
+                if spec.source == AgentSource::Custom {
+                    spec.source = AgentSource::Builtin;
+                }
+                *existing = spec;
+            }
             None => specs.push(spec),
         }
     }
@@ -137,6 +312,54 @@ fn is_executable(p: &Path) -> bool {
 mod tests {
     use super::*;
 
+    #[test]
+    fn launch_metadata_distinguishes_defaults_overrides_and_read_only_agents() {
+        let dir = tempfile::tempdir().unwrap();
+        let list = || load(Some(dir.path())).iter().map(describe).collect::<Vec<_>>();
+        let defaults = list();
+        let codex = defaults.iter().find(|p| p.id == "codex").unwrap();
+        assert_eq!(codex.program, "codex");
+        assert_eq!(codex.default_program.as_deref(), Some("codex"));
+        assert_eq!(codex.args, ["app-server"]);
+        assert_eq!(codex.default_args, codex.args);
+        assert_eq!(codex.command, "codex app-server");
+        assert_eq!(codex.login_hint.as_deref(), Some("Run `codex login` in a terminal."));
+        assert!(!codex.command_overridden);
+        assert!(codex.command_editable);
+        for p in &defaults {
+            assert_eq!(p.source, AgentSource::Builtin);
+            assert!(p.default_program.is_some());
+            assert_eq!(p.command_editable, !p.id.ends_with("-acp"));
+            assert_eq!(
+                p.command_read_only_reason,
+                p.id.ends_with("-acp").then_some(AgentCommandReadOnlyReason::PackageRunner)
+            );
+        }
+        set_builtin_command(dir.path(), "codex", Some("/path with spaces/codex")).unwrap();
+        let overridden = list().into_iter().find(|p| p.id == "codex").unwrap();
+        assert_eq!(overridden.program, "/path with spaces/codex");
+        assert_eq!(overridden.args, codex.args);
+        assert_eq!(overridden.default_program, codex.default_program);
+        assert!(overridden.command_overridden && overridden.command_editable);
+        assert_eq!(overridden.source, AgentSource::Builtin);
+        set_builtin_command(dir.path(), "codex", Some("codex")).unwrap();
+        assert!(!list().iter().find(|p| p.id == "codex").unwrap().command_overridden);
+        std::fs::write(
+            dir.path().join("gemini.toml"),
+            "command = \"/registry/gemini\"\n[registry]\nid = \"gemini\"\nversion = \"1.0\"\n",
+        )
+        .unwrap();
+        let registry = list().into_iter().find(|p| p.id == "gemini").unwrap();
+        assert_eq!(registry.default_program.as_deref(), Some("gemini"));
+        assert!(!registry.command_editable);
+        assert_eq!(registry.command_read_only_reason, Some(AgentCommandReadOnlyReason::Registry));
+        assert!(matches!(registry.source, AgentSource::Registry { .. }));
+        std::fs::write(dir.path().join("mine.toml"), "command = \"mine\"\n").unwrap();
+        let custom = list().into_iter().find(|p| p.id == "mine").unwrap();
+        assert_eq!(custom.default_program, None);
+        assert_eq!(custom.command_read_only_reason, Some(AgentCommandReadOnlyReason::CustomAgent));
+    }
+
     #[test]
     fn custom_agents_extend_and_override_the_builtins() {
         let dir = tempfile::tempdir().unwrap();
@@ -155,4 +378,126 @@ mod tests {
         assert!(!installed("/definitely/not/here"));
         assert!(installed("sh"));
     }
+
+    #[test]
+    fn set_builtin_env_writes_and_clears_the_environment() {
+        let dir = tempfile::tempdir().unwrap();
+        let env = BTreeMap::from([("CLAUDE_CODE_ENTRYPOINT".to_owned(), "openidea".to_owned())]);
+        set_builtin_env(dir.path(), "claude", env.clone()).unwrap();
+        let claude = load(Some(dir.path())).into_iter().find(|s| s.id == "claude").unwrap();
+        assert_eq!(claude.env, vec![("CLAUDE_CODE_ENTRYPOINT".to_owned(), "openidea".to_owned())]);
+        assert_eq!(describe(&claude).env, env);
+        // The command override and the environment are kept independently.
+        set_builtin_command(dir.path(), "claude", Some("/opt/claude")).unwrap();
+        set_builtin_command(dir.path(), "claude", None).unwrap();
+        assert!(dir.path().join("claude.toml").is_file());
+        set_builtin_env(dir.path(), "claude", BTreeMap::new()).unwrap();
+        assert!(!dir.path().join("claude.toml").exists());
+        set_builtin_env(dir.path(), "not-a-builtin", env).unwrap_err();
+    }
+
+    #[test]
+    fn set_builtin_command_overrides_and_clears_a_builtin() {
+        let dir = tempfile::tempdir().unwrap();
+        set_builtin_command(dir.path(), "not-a-builtin", Some("/x")).unwrap_err();
+        set_builtin_command(dir.path(), "claude", Some("/opt/claude")).unwrap();
+        let claude = load(Some(dir.path())).into_iter().find(|s| s.id == "claude").unwrap();
+        assert_eq!((claude.command.as_str(), claude.driver), ("/opt/claude", Driver::Claude));
+        assert!(claude.args.is_empty());
+        // A registry install is neither overwritten nor removed by a command override.
+        let path = dir.path().join("codex.toml");
+        CustomAgent {
+            name: None,
+            driver: Driver::Acp,
+            command: "amp".into(),
+            args: vec![],
+            env: BTreeMap::new(),
+            registry: Some(RegistryRef { id: "amp-acp".into(), version: "1.0.0".into() }),
+        }
+        .write(&path)
+        .unwrap();
+        set_builtin_command(dir.path(), "codex", Some("/x")).unwrap_err();
+        set_builtin_command(dir.path(), "codex", None).unwrap_err();
+        assert!(path.exists());
+        // Clearing (twice) returns the built-in to auto-detection.
+        set_builtin_command(dir.path(), "claude", None).unwrap();
+        set_builtin_command(dir.path(), "claude", None).unwrap();
+        assert!(!dir.path().join("claude.toml").exists());
+        assert_eq!(load(Some(dir.path())).iter().find(|s| s.id == "claude").unwrap().command, "claude");
+    }
+
+    #[test]
+    fn set_builtin_command_preserves_other_customizations_on_save_and_reset() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("claude.toml");
+        for field in ["name", "driver", "args", "env", "unnamed"] {
+            let mut agent = CustomAgent {
+                name: Some("Claude Code".into()),
+                driver: Driver::Claude,
+                command: "/old/claude".into(),
+                args: vec![],
+                env: BTreeMap::new(),
+                registry: None,
+            };
+            match field {
+                "name" => agent.name = Some("My Claude".into()),
+                "driver" => agent.driver = Driver::Acp,
+                "args" => agent.args.push("--verbose".into()),
+                "env" => {
+                    agent.env.insert("K".into(), "v".into());
+                }
+                "unnamed" => agent.name = None,
+                _ => unreachable!(),
+            }
+            agent.write(&path).unwrap();
+
+            set_builtin_command(dir.path(), "claude", Some("/new/claude")).unwrap();
+            agent.command = "/new/claude".into();
+            assert_eq!(CustomAgent::read(&path).unwrap(), agent, "{field}");
+
+            set_builtin_command(dir.path(), "claude", None).unwrap();
+            agent.command = "claude".into();
+            assert_eq!(CustomAgent::read(&path).unwrap(), agent, "{field}");
+        }
+    }
+
+    #[test]
+    fn resetting_a_command_only_override_removes_the_file() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("codex.toml");
+        std::fs::write(
+            &path,
+            "name = \"Codex\"\ndriver = \"codex\"\ncommand = \"/custom/codex\"\nargs = [\"app-server\"]\n",
+        )
+        .unwrap();
+
+        set_builtin_command(dir.path(), "codex", None).unwrap();
+
+        assert!(!path.exists());
+        assert_eq!(
+            load(Some(dir.path())).into_iter().find(|s| s.id == "codex").unwrap(),
+            builtin_spec("codex").unwrap()
+        );
+    }
+
+    #[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/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/timeline.rs

@@ -1,6 +1,6 @@
 //! Folds ACP `session/update` notifications into a task's entries.
 
-use crate::model::{AgentEntry, AgentPlanItem, AgentToolDiff, AgentToolStatus};
+use crate::model::{AgentEntry, AgentPlanItem, AgentSubagentStatus, AgentToolDiff, AgentToolStatus};
 use ide_core::IpcPath;
 use serde_json::Value;
 use std::collections::HashMap;
@@ -13,6 +13,10 @@ 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.
@@ -31,16 +35,15 @@ impl Timeline {
                     t.tools.insert(id.clone(), i);
                 }
                 AgentEntry::Plan { .. } => t.plan = Some(i),
+                AgentEntry::Subagent { id, .. } => {
+                    t.cards.insert(id.clone(), i);
+                }
                 _ => {}
             }
         }
         t
     }
 
-    pub fn has_tool(&self, id: &str) -> bool {
-        self.tools.contains_key(id)
-    }
-
     pub fn push(&mut self, entry: AgentEntry) -> usize {
         self.entries.push(entry);
         self.entries.len() - 1
@@ -170,11 +173,130 @@ impl Timeline {
         }
     }
 
-    /// Settles what an ended turn left open: running tools and pending permissions.
-    pub fn end_turn(&mut self) -> Vec<usize> {
+    /// 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) =>
                 {
@@ -196,7 +318,30 @@ fn str_field(v: &Value, key: &str) -> String {
     v.get(key).and_then(Value::as_str).unwrap_or_default().to_owned()
 }
 
-fn content_text(content: Option<&Value>) -> Option<String> {
+/// 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),
@@ -289,13 +434,40 @@ mod tests {
         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(), vec![2, 3]);
+        t.push(AgentEntry::Permission {
+            id: 1,
+            title: "Run?".into(),
+            options: vec![],
+            questions: 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));

crates/ide-agent/src/worktree.rs

@@ -3,7 +3,9 @@
 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::{Duration, UNIX_EPOCH};
 
 pub(crate) struct Created {
     pub path: PathBuf,
@@ -46,13 +48,50 @@ pub(crate) fn create(project_root: &Path, worktrees_dir: &Path, title: &str, bas
     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)
+/// `git worktree remove --force -- <path>`. When git no longer recognizes the
+/// worktree (a pruned registration, a moved repository, a deleted `.git` file)
+/// it fails with "is not a working tree". A folder under `worktrees_dir` is still
+/// ours, so it is removed directly to keep the task deletable (a stale
+/// registration prunes later); anything else keeps git's error.
+pub(crate) fn remove(project_root: &Path, worktrees_dir: &Path, path: &Path) -> IdeResult<()> {
+    let repo = repo_at(project_root)?;
+    let err = match repo.remove_worktree(path, true) {
+        Ok(()) => return Ok(()),
+        Err(e) => e,
+    };
+    if !path.exists() {
+        return Ok(());
+    }
+    if !path.starts_with(worktrees_dir) || path == worktrees_dir {
+        return Err(err);
+    }
+    retrying(REMOVE_ATTEMPTS, REMOVE_PAUSE, || std::fs::remove_dir_all(path))
+        .map_err(|e| IdeError::internal(format!("{}: {e}", path.display())))
+}
+
+/// On Windows a folder can't be deleted while a process still has a file in it open
+/// (os error 32): an agent's helper that outlived it, an antivirus scan, the search indexer.
+/// Those let go within moments, so removing is retried for a few seconds.
+const REMOVE_ATTEMPTS: u32 = 10;
+const REMOVE_PAUSE: Duration = Duration::from_millis(300);
+
+fn retrying(attempts: u32, pause: Duration, mut op: impl FnMut() -> std::io::Result<()>) -> std::io::Result<()> {
+    for _ in 1..attempts {
+        match op() {
+            Err(e) if e.kind() != std::io::ErrorKind::NotFound => std::thread::sleep(pause),
+            _ => return Ok(()),
+        }
+    }
+    match op() {
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(()),
+        r => r,
+    }
 }
 
 /// 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 repo = repo_at(cwd)?;
+    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));
@@ -74,8 +113,32 @@ pub(crate) fn changes(cwd: &Path, base: &str) -> IdeResult<Vec<AgentChange>> {
     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>> {
-    repo_at(cwd)?.file_at(path, Some(rev))
+    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.
@@ -106,6 +169,54 @@ fn unique_slug(base: &str, taken: impl Fn(&str) -> bool) -> String {
 mod tests {
     use super::*;
 
+    #[test]
+    fn removing_is_retried_while_a_file_is_still_in_use() {
+        use std::io::{Error, ErrorKind};
+        // A sharing violation as Windows reports it (os error 32), a vanished folder, other errors.
+        let in_use = || Error::from_raw_os_error(32);
+        for (fails, outcome) in [(0, true), (3, true), (REMOVE_ATTEMPTS - 1, true), (REMOVE_ATTEMPTS, false)] {
+            let mut calls = 0;
+            let r = retrying(REMOVE_ATTEMPTS, Duration::ZERO, || {
+                calls += 1;
+                if calls <= fails { Err(in_use()) } else { Ok(()) }
+            });
+            assert_eq!(r.is_ok(), outcome, "{fails} failures");
+            assert_eq!(calls, (fails + 1).min(REMOVE_ATTEMPTS));
+        }
+        let mut calls = 0;
+        let gone = retrying(REMOVE_ATTEMPTS, Duration::ZERO, || {
+            calls += 1;
+            if calls == 1 { Err(in_use()) } else { Err(Error::from(ErrorKind::NotFound)) }
+        });
+        assert!(gone.is_ok(), "deleted meanwhile: done");
+        assert_eq!(calls, 2);
+    }
+
+    #[cfg(windows)]
+    #[test]
+    fn removing_waits_for_a_windows_file_lock_to_be_released() {
+        use std::os::windows::fs::OpenOptionsExt;
+        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\n").unwrap();
+        git(&repo, &["add", "."]);
+        git(&repo, &["commit", "-q", "-m", "init"]);
+        let worktrees = tmp.path().join("wt");
+        let created = create(&repo, &worktrees, "Locked file", None).unwrap();
+        let file = std::fs::OpenOptions::new().read(true).share_mode(0).open(created.path.join("a.txt")).unwrap();
+        assert_eq!(std::fs::remove_file(created.path.join("a.txt")).unwrap_err().raw_os_error(), Some(32));
+        let release = std::thread::spawn(move || {
+            std::thread::sleep(Duration::from_millis(800));
+            drop(file);
+        });
+        let result = remove(&repo, &worktrees, &created.path);
+        release.join().unwrap();
+        result.unwrap();
+        assert!(!created.path.exists());
+    }
+
     #[test]
     fn slugs_are_branch_safe() {
         assert_eq!(slugify("Fix lexer UTF-16 columns!"), "fix-lexer-utf-16-columns");
@@ -115,6 +226,20 @@ mod tests {
         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, tmp.path(), &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"])
@@ -148,9 +273,51 @@ mod tests {
         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();
+        remove(&repo, &tmp.path().join("wt"), &created.path).unwrap();
         assert!(!created.path.exists());
     }
+
+    #[test]
+    fn a_broken_worktree_registration_still_leaves_a_deletable_folder() {
+        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\n").unwrap();
+        git(&repo, &["add", "."]);
+        git(&repo, &["commit", "-q", "-m", "init"]);
+
+        // A pruned registration (the repository moved, `git worktree prune` ran).
+        let created = create(&repo, &tmp.path().join("wt"), "Edit A", None).unwrap();
+        let registration = repo.join(".git/worktrees").join(created.path.file_name().unwrap());
+        std::fs::remove_dir_all(registration).unwrap();
+        remove(&repo, &tmp.path().join("wt"), &created.path).unwrap();
+        assert!(!created.path.exists());
+
+        // A deleted `.git` file in the worktree itself.
+        let created = create(&repo, &tmp.path().join("wt"), "Edit B", None).unwrap();
+        std::fs::remove_file(created.path.join(".git")).unwrap();
+        remove(&repo, &tmp.path().join("wt"), &created.path).unwrap();
+        assert!(!created.path.exists());
+
+        // A folder outside the worktrees directory is never deleted by hand.
+        let elsewhere = tmp.path().join("elsewhere");
+        std::fs::create_dir(&elsewhere).unwrap();
+        std::fs::write(elsewhere.join("keep.txt"), "x\n").unwrap();
+        assert!(remove(&repo, &tmp.path().join("wt"), &elsewhere).is_err());
+        assert!(elsewhere.join("keep.txt").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)"}]}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 3, "method": "session/set_config_option", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "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": "caf5db42-df04-40e3-bb8b-e270510e17ca", "prompt": [{"type": "text", "text": "Count slowly from 1 to 200, one number per line."}]}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "user_message", "messageId": "10e7d710-21e8-4029-9b34-95767d0a52f7", "content": [{"text": "Count slowly from 1 to 200, one number per line.", "type": "text"}]}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 4, "result": {"messageId": "10e7d710-21e8-4029-9b34-95767d0a52f7"}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "state_update", "state": "running"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "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": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "session_info_update", "title": "Counting from 1 to 200", "updatedAt": "2026-10-28T12:56:16.800Z"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "usage_update", "used": 27725, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "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": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "1"}, "messageId": "msg_011CgUfvCcMHuxPdrtcQhYir"}}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "method": "session/cancel", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca"}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "usage_update", "used": 27725, "size": 1000000, "cost": {"amount": 0.00012770000000000001, "currency": "USD"}, "_meta": {"_claude/origin": {"kind": "human"}, "_claude/model": "claude-haiku-5-5"}}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "caf5db42-df04-40e3-bb8b-e270510e17ca", "update": {"sessionUpdate": "state_update", "state": "idle", "stopReason": "cancelled", "usage": {"inputTokens": 0, "outputTokens": 0, "cachedReadTokens": 0, "cachedWriteTokens": 0, "totalTokens": 0}, "_meta": {"quota": {"token_count": {"totalTokens": 0, "inputTokens": 0, "cachedInputTokens": 0, "cachedWriteTokens": 0, "outputTokens": 0, "reasoningOutputTokens": 0}, "model_usage": [{"model": "claude-haiku-5-5", "token_count": {"totalTokens": 1201, "inputTokens": 1182, "cachedInputTokens": 0, "cachedWriteTokens": 0, "outputTokens": 19, "reasoningOutputTokens": 0}}]}}}}}}

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"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "id": 1, "result": {"protocolVersion": 1, "agentCapabilities": {"_meta": {"claudeCode": {"promptQueueing": true}, "authStatus": {}}, "promptCapabilities": {"image": true, "embeddedContext": true}, "mcpCapabilities": {"http": true, "sse": true}, "auth": {"logout": {}}, "providers": {}, "loadSession": true, "sessionCapabilities": {"additionalDirectories": {}, "close": {}, "delete": {}, "fork": {}, "list": {}, "resume": {}, "systemPrompt": {"mode": {"override": {}}}}}, "agentInfo": {"name": "@agentclientprotocol/claude-agent-acp", "title": "Claude Agent", "version": "0.97.0"}, "authMethods": [], "_meta": {"steering": {"supported": true}}}}}

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

@@ -0,0 +1,21 @@
+{"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/resume", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "cwd": "/work/proj", "mcpServers": []}}}
+{"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": 2, "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)"}]}}}
+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 3, "method": "session/resume", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "cwd": "/work/proj", "mcpServers": [], "replayFrom": {"type": "start"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"messageId": "1d88b7a2-a804-487c-ba5f-6de07f77d9d7", "content": [], "sessionUpdate": "user_message"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "user_message_chunk", "content": {"type": "text", "text": "Use the TodoWrite tool to make a two-item todo list (items: 'look', 'answer'), then run the shell command `echo hello` with the Bash tool, then create a file named note.txt containing the single line 'hi' with the Write tool, then reply with the single word done."}, "messageId": "1d88b7a2-a804-487c-ba5f-6de07f77d9d7"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01RDoq6tMnVUvKSaXQCgWT4Z", "name": "ToolSearch", "rawInput": {"query": "select:TodoWrite", "max_results": 1}, "status": "pending", "title": "ToolSearch", "kind": "other", "content": [], "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01RDoq6tMnVUvKSaXQCgWT4Z", "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": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "terminal_update", "terminalId": "toolu_01H6aZs4sGpLd5bWRZz8b8Mu", "command": "echo hello; ls -la /work/proj/note.txt 2>&1"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01H6aZs4sGpLd5bWRZz8b8Mu", "name": "Bash", "rawInput": {"command": "echo hello; ls -la /work/proj/note.txt 2>&1", "description": "Run echo hello and check whether note.txt exists"}, "status": "pending", "title": "echo hello; ls -la /work/proj/note.txt 2>&1", "kind": "execute", "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": {"sessionUpdate": "terminal_update", "terminalId": "toolu_01H6aZs4sGpLd5bWRZz8b8Mu", "output": {"data": "RXhpdCBjb2RlIDEKaGVsbG8KbHM6IC9wcml2YXRlL3RtcC9hY3B2Mi1ydW4vcHJvai9ub3RlLnR4dDogTm8gc3VjaCBmaWxlIG9yIGRpcmVjdG9yeQ=="}}}}}
+{"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"}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "a0360979d934c7b55", "update": {"toolCallId": "toolu_01Q8md8yrGpUb8BKr8fNDqDJ", "status": "completed", "sessionUpdate": "tool_call_update"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "a0360979d934c7b55", "update": {"sessionUpdate": "agent_message_chunk", "content": {"type": "text", "text": "当前目录（`/work/proj`）中只有一个文件：\n\n- `note.txt`"}, "_meta": {"claudeCode": {"parentToolUseId": "toolu_011Lf9AUZDG1DHbPvpXbhBXE"}}, "messageId": "msg_011CgUftiJErpmvBCSeSwc1V"}}}}
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+{"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"}}}}
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crates/ide-agent/tests/fixtures/acp-v2/turn.jsonl

@@ -0,0 +1,44 @@
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"toolCallId": "toolu_01QuF3wSLUeeMp5QTuiNoTBn", "rawInput": {"file_path": "/work/proj/note.txt", "content": "hi\n"}, "sessionUpdate": "tool_call_update"}}}}
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+{"dir": "out", "msg": {"jsonrpc": "2.0", "id": 0, "result": {"outcome": {"outcome": "selected", "optionId": "allow-once"}}}}
+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "state_update", "state": "running"}}}}
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+{"dir": "in", "msg": {"jsonrpc": "2.0", "method": "session/update", "params": {"sessionId": "28846a4c-c3e8-4a45-a3d0-c19f10d19d1a", "update": {"sessionUpdate": "usage_update", "used": 32544, "size": 1000000, "_meta": {"_claude/model": "claude-haiku-5-5"}}}}}
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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 @@
+{"connection":1}
+{"from":"client","msg":{"id":1,"jsonrpc":"2.0","method":"initialize","params":{"clientCapabilities":{"fs":{"readTextFile":false,"writeTextFile":false},"subagents":{},"terminal":false},"clientInfo":{"name":"OpenIDEA","version":"0.1.22"},"protocolVersion":1}}}
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+{"from":"client","msg":{"id":2,"jsonrpc":"2.0","method":"session/new","params":{"cwd":"/private/var/folders/gx/1228y8wj7bx6dl6m9syzrb340000gn/T/.tmpjYjkeK","mcpServers":[]}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"_auth/status_update","params":{"authStatus":{"account":{"email":"redacted","organization":"redacted","plan":"max"},"kind":"account","label":"Claude Max"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"_auth/status_update","params":{"authStatus":{"account":{"email":"redacted","organization":"redacted","plan":"Claude Max"},"kind":"account","label":"Claude Max"}}}}
+{"from":"agent","msg":{"id":2,"jsonrpc":"2.0","result":{"configOptions":[{"category":"mode","currentValue":"default","description":"Session permission mode","id":"mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","currentValue":"opus","description":"AI model to use","id":"model","name":"Model","options":[{"description":"Sonnet 5.5","name":"Default (recommended)","value":"default"},{"description":"For complex work and everyday tasks","name":"Opus 5.5","value":"opus"},{"description":"For your toughest challenges","name":"Fable 5.1","value":"fable"},{"description":"Most efficient for simpler tasks","name":"Sonnet 5.5","value":"sonnet"},{"description":"Fastest for quick answers","name":"Haiku 5.5","value":"haiku"},{"description":"Fastest for quick answers","name":"Haiku 4.5","value":"claude-haiku-4-5-20251001"},{"description":"Efficient for routine tasks","name":"Sonnet 5","value":"claude-sonnet-5"},{"description":"Best for everyday, complex tasks","name":"Opus 5","value":"claude-opus-5"},{"description":"Most capable for your hardest and longest-running tasks","name":"Fable 5","value":"claude-fable-5"},{"description":"Best for everyday, complex tasks","name":"Opus 4.8","value":"claude-opus-4-8"},{"description":"Best for everyday, complex tasks","name":"Opus 4.7","value":"claude-opus-4-7"},{"description":"Best for everyday, complex tasks","name":"Opus 4.6","value":"claude-opus-4-6"},{"description":"Efficient for routine tasks","name":"Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"},{"category":"thought_level","currentValue":"medium","description":"Available effort levels for this model","id":"effort","name":"Effort","options":[{"name":"Default","value":"default"},{"name":"Low","value":"low"},{"name":"Medium","value":"medium"},{"name":"High","value":"high"},{"name":"Xhigh","value":"xhigh"},{"name":"Max","value":"max"}],"type":"select"},{"category":"model_config","currentValue":"off","description":"Faster responses on supported models","id":"fast","name":"Fast mode","options":[{"name":"On","value":"on"},{"name":"Off","value":"off"}],"type":"select"},{"category":"model_config","currentValue":"off","description":"Dynamic workflows on every task, at any effort level","id":"ultracode","name":"Ultracode","options":[{"name":"On","value":"on"},{"name":"Off","value":"off"}],"type":"select"},{"currentValue":"default","description":"Main-thread agent persona","id":"agent","name":"Agent","options":[{"description":"Standard Claude Code agent","name":"Default","value":"default"},{"description":"Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise.","name":"code-simplifier:code-simplifier","value":"code-simplifier:code-simplifier"},{"description":"Agent from sentry-skills plugin","name":"sentry-skills:code-simplifier","value":"sentry-skills:code-simplifier"},{"description":"Agent from sentry-skills plugin","name":"sentry-skills:senpai","value":"sentry-skills:senpai"}],"type":"select"}],"modes":{"availableModes":[{"description":"Always ask before making changes","id":"default","name":"Manual"},{"description":"Automatically accept all file edits","id":"acceptEdits","name":"Accept edits"},{"description":"Create a plan before making changes","id":"plan","name":"Plan"},{"description":"Claude handles permission decisions","id":"auto","name":"Auto"},{"description":"Accepts all permissions","id":"bypassPermissions","name":"Bypass permissions"}],"currentModeId":"default"},"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca"}}}
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+{"from":"agent","msg":{"id":3,"jsonrpc":"2.0","result":{"configOptions":[{"category":"mode","currentValue":"default","description":"Session permission mode","id":"mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","currentValue":"haiku","description":"AI model to use","id":"model","name":"Model","options":[{"description":"Sonnet 5.5","name":"Default (recommended)","value":"default"},{"description":"For complex work and everyday tasks","name":"Opus 5.5","value":"opus"},{"description":"For your toughest challenges","name":"Fable 5.1","value":"fable"},{"description":"Most efficient for simpler tasks","name":"Sonnet 5.5","value":"sonnet"},{"description":"Fastest for quick answers","name":"Haiku 5.5","value":"haiku"},{"description":"Fastest for quick answers","name":"Haiku 4.5","value":"claude-haiku-4-5-20251001"},{"description":"Efficient for routine tasks","name":"Sonnet 5","value":"claude-sonnet-5"},{"description":"Best for everyday, complex tasks","name":"Opus 5","value":"claude-opus-5"},{"description":"Most capable for your hardest and longest-running tasks","name":"Fable 5","value":"claude-fable-5"},{"description":"Best for everyday, complex tasks","name":"Opus 4.8","value":"claude-opus-4-8"},{"description":"Best for everyday, complex tasks","name":"Opus 4.7","value":"claude-opus-4-7"},{"description":"Best for everyday, complex tasks","name":"Opus 4.6","value":"claude-opus-4-6"},{"description":"Efficient for routine tasks","name":"Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"},{"category":"thought_level","currentValue":"high","description":"Available effort levels for this model","id":"effort","name":"Effort","options":[{"name":"Default","value":"default"},{"name":"Low","value":"low"},{"name":"Medium","value":"medium"},{"name":"High","value":"high"},{"name":"Xhigh","value":"xhigh"},{"name":"Max","value":"max"}],"type":"select"},{"category":"model_config","currentValue":"off","description":"Dynamic workflows on every task, at any effort level","id":"ultracode","name":"Ultracode","options":[{"name":"On","value":"on"},{"name":"Off","value":"off"}],"type":"select"},{"currentValue":"default","description":"Main-thread agent persona","id":"agent","name":"Agent","options":[{"description":"Standard Claude Code agent","name":"Default","value":"default"},{"description":"Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise.","name":"code-simplifier:code-simplifier","value":"code-simplifier:code-simplifier"},{"description":"Agent from sentry-skills plugin","name":"sentry-skills:code-simplifier","value":"sentry-skills:code-simplifier"},{"description":"Agent from sentry-skills plugin","name":"sentry-skills:senpai","value":"sentry-skills:senpai"}],"type":"select"}]}}}
+{"from":"client","msg":{"id":4,"jsonrpc":"2.0","method":"session/prompt","params":{"prompt":[{"text":"Remember the number 7. Reply with just: OK","type":"text"}],"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca"}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"_auth/status_update","params":{"authStatus":{"account":{"email":"redacted","organization":"redacted","plan":"max"},"kind":"account","label":"Claude Max"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"availableCommands":[{"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)","input":null,"name":"find-skills"},{"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)","input":null,"name":"hyperframes"},{"description":"The HyperFrames CLI by job - scaffold, check, look at frames, edit the timeline, preview, render locally or in the cloud, publish, project history - plus reading its JSON and recovering from build or render failures. (user)","input":null,"name":"hyperframes-cli"}],"sessionUpdate":"available_commands_update"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"availableCommands":[{"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)","input":null,"name":"find-skills"},{"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)","input":null,"name":"hyperframes"},{"description":"The HyperFrames CLI by job - scaffold, check, look at frames, edit the timeline, preview, render locally or in the cloud, publish, project history - plus reading its JSON and recovering from build or render failures. (user)","input":null,"name":"hyperframes-cli"}],"sessionUpdate":"available_commands_update"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"sessionUpdate":"session_info_update","title":"Remember the number 7","updatedAt":"2026-10-28T13:03:03.998Z"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"_meta":{"_claude/model":"claude-haiku-5-5"},"sessionUpdate":"usage_update","size":1000000,"used":27722}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"content":{"text":"O","type":"text"},"messageId":"msg_011CgUgSBpoRELh8ZhRsPB8c","sessionUpdate":"agent_message_chunk"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"content":{"text":"K","type":"text"},"messageId":"msg_011CgUgSBpoRELh8ZhRsPB8c","sessionUpdate":"agent_message_chunk"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"_meta":{"_claude/model":"claude-haiku-5-5"},"sessionUpdate":"usage_update","size":1000000,"used":27725}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"_meta":{"_claude/model":"claude-haiku-5-5","_claude/origin":{"kind":"human"}},"cost":{"amount":0.00319383,"currency":"USD"},"sessionUpdate":"usage_update","size":1000000,"used":27725}}}}
+{"from":"agent","msg":{"id":4,"jsonrpc":"2.0","result":{"_meta":{"quota":{"model_usage":[{"model":"claude-haiku-5-5","token_count":{"cachedInputTokens":13043,"cachedWriteTokens":14676,"inputTokens":1182,"outputTokens":20,"reasoningOutputTokens":0,"totalTokens":28921}}],"token_count":{"cachedInputTokens":13043,"cachedWriteTokens":14676,"inputTokens":2,"outputTokens":4,"reasoningOutputTokens":0,"totalTokens":27725}}},"stopReason":"end_turn","usage":{"cachedReadTokens":13043,"cachedWriteTokens":14676,"inputTokens":2,"outputTokens":4,"totalTokens":27725}}}}
+{"from":"client","msg":{"id":5,"jsonrpc":"2.0","method":"session/prompt","params":{"prompt":[{"text":"Which number did I ask you to remember? Reply with just the number.","type":"text"}],"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca"}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"_meta":{"_claude/model":"claude-haiku-5-5"},"sessionUpdate":"usage_update","size":1000000,"used":31548}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"content":{"text":"7","type":"text"},"messageId":"msg_011CgUgSSMfzyR1PvWwUr2ym","sessionUpdate":"agent_message_chunk"}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"_meta":{"_claude/model":"claude-haiku-5-5"},"sessionUpdate":"usage_update","size":1000000,"used":31602}}}}
+{"from":"agent","msg":{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"110d73dd-95b7-4868-90a3-3536fd66cfca","update":{"_meta":{"_claude/model":"claude-haiku-5-5","_claude/origin":{"kind":"human"}},"cost":{"amount":0.00705356,"currency":"USD"},"sessionUpdate":"usage_update","size":1000000,"used":31602}}}}
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crates/ide-agent/tests/fixtures/acp/claude-acp@v1/permission_allow.jsonl

@@ -0,0 +1,32 @@
+{"connection":1}
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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/simple.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

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

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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-android/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "ide-android"
+description = "Android devices and logcat for the Logcat tool window, driven through the adb CLI"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+ide-core.workspace = true
+serde.workspace = true
+specta.workspace = true
+which = "8"
+
+[dev-dependencies]
+tempfile.workspace = true

crates/ide-android/src/lib.rs

@@ -0,0 +1,222 @@
+//! Android devices and their logs, driven through the `adb` CLI (like git is
+//! driven through its CLI).
+//!
+//! The Logcat tool window needs two things from a device: that it is there, and
+//! what it prints. Both come from `adb`, which the Android SDK installs — the
+//! IDE does not bundle it.
+//!
+//! Every function blocks; callers run them off the UI / command threads.
+
+mod model;
+mod process;
+
+pub use model::*;
+
+use ide_core::{CancellationToken, IdeError, IdeResult};
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::sync::OnceLock;
+use std::time::Duration;
+
+/// `adb devices` is quick unless it starts the daemon, which can take a moment.
+const DEVICES: Duration = Duration::from_secs(20);
+/// `adb logcat -c` only truncates the buffers.
+const CLEAR: Duration = Duration::from_secs(15);
+/// How much of the buffer to show before following, so opening the window is not empty.
+const TAIL_LINES: u32 = 200;
+/// Logcat can print thousands of lines a second: batches keep the IPC channel sane,
+/// while `IDLE` makes sure a quiet stream still shows its last line promptly.
+const BATCH_IDLE: Duration = Duration::from_millis(60);
+const BATCH_MAX: usize = 300;
+
+fn exe(name: &str) -> String {
+    if cfg!(windows) { format!("{name}.exe") } else { name.to_owned() }
+}
+
+/// Android SDK locations, most specific first: the environment, then the usual
+/// per-platform installs (a GUI app on macOS does not see a shell's `ANDROID_HOME`).
+fn sdk_roots() -> Vec<PathBuf> {
+    let mut roots: Vec<PathBuf> = ["ANDROID_HOME", "ANDROID_SDK_ROOT"]
+        .iter()
+        .filter_map(|key| std::env::var_os(key).map(PathBuf::from))
+        .collect();
+    let home = std::env::var_os(if cfg!(windows) { "USERPROFILE" } else { "HOME" }).map(PathBuf::from);
+    if let Some(home) = home.filter(|_| !cfg!(windows)) {
+        roots.push(home.join("Library/Android/sdk"));
+        roots.push(home.join("Android/Sdk"));
+    }
+    if cfg!(windows)
+        && let Some(local) = std::env::var_os("LOCALAPPDATA").map(PathBuf::from)
+    {
+        roots.push(local.join("Android/Sdk"));
+    }
+    roots
+}
+
+/// Locates the adb executable once per process; `OPENIDEA_ADB` overrides.
+pub fn adb_executable() -> Option<PathBuf> {
+    static ADB: OnceLock<Option<PathBuf>> = OnceLock::new();
+    ADB.get_or_init(|| {
+        if let Some(explicit) = std::env::var_os("OPENIDEA_ADB").map(PathBuf::from).filter(|p| p.is_file()) {
+            return Some(explicit);
+        }
+        let name = exe("adb");
+        if let Some(found) =
+            sdk_roots().into_iter().map(|root| root.join("platform-tools").join(&name)).find(|p| p.is_file())
+        {
+            return Some(found);
+        }
+        if let Ok(found) = which::which("adb") {
+            return Some(found);
+        }
+        let mut candidates: Vec<PathBuf> = if cfg!(windows) {
+            vec![PathBuf::from(r"C:\platform-tools\adb.exe")]
+        } else {
+            ["/usr/local/bin/adb", "/opt/homebrew/bin/adb", "/usr/bin/adb"].iter().map(PathBuf::from).collect()
+        };
+        candidates.extend([
+            PathBuf::from("/opt/android-sdk/platform-tools/adb"),
+            PathBuf::from("/usr/lib/android-sdk/platform-tools/adb"),
+        ]);
+        candidates.into_iter().find(|p: &PathBuf| p.is_file())
+    })
+    .clone()
+}
+
+fn executable() -> IdeResult<PathBuf> {
+    adb_executable().ok_or_else(|| {
+        IdeError::unavailable(
+            "adb was not found: install the Android SDK platform-tools, or set ANDROID_HOME (or OPENIDEA_ADB)",
+        )
+    })
+}
+
+/// The directory holding adb, for command lines that expect `adb` on `PATH`.
+pub fn platform_tools_dir() -> Option<&'static Path> {
+    static DIR: OnceLock<Option<PathBuf>> = OnceLock::new();
+    DIR.get_or_init(|| adb_executable().as_deref().and_then(Path::parent).map(Path::to_path_buf)).as_deref()
+}
+
+/// Connected devices, online ones first; starting the adb daemon when needed.
+pub fn devices() -> IdeResult<Vec<AndroidDevice>> {
+    let adb = executable()?;
+    let mut cmd = Command::new(adb);
+    cmd.args(["devices", "-l"]);
+    let out = process::run(cmd, DEVICES, None)?;
+    if !out.success {
+        let message = out.stderr.trim();
+        return Err(IdeError::unavailable(if message.is_empty() {
+            "adb devices failed".to_owned()
+        } else {
+            format!("adb devices failed: {message}")
+        }));
+    }
+    Ok(parse_devices(&out.stdout))
+}
+
+/// Empties the device's log buffers (`adb logcat -c`).
+pub fn clear_log(serial: &str, cancel: &CancellationToken) -> IdeResult<()> {
+    let adb = executable()?;
+    let mut cmd = Command::new(adb);
+    cmd.args(["-s", serial, "logcat", "-c"]);
+    let out = process::run(cmd, CLEAR, Some(cancel))?;
+    if out.success {
+        Ok(())
+    } else {
+        Err(IdeError::unavailable(format!("adb logcat -c failed: {}", out.stderr.trim())))
+    }
+}
+
+fn command(adb: &Path, serial: &str, tail: Option<u32>) -> Command {
+    let mut cmd = Command::new(adb);
+    cmd.args(["-s", serial, "logcat", "-v", "threadtime"]);
+    if let Some(lines) = tail {
+        // Recent history first, then follow: `-T <count>` is lines, not an exit.
+        cmd.arg("-T").arg(lines.to_string());
+    }
+    cmd
+}
+
+/// Follows `serial`'s log until `cancel` fires, handing lines over in batches.
+/// With `clear`, the buffers are emptied first so the window starts clean.
+pub fn logcat(
+    serial: &str,
+    clear: bool,
+    cancel: &CancellationToken,
+    on_batch: &mut dyn FnMut(Vec<LogcatLine>),
+) -> IdeResult<()> {
+    let adb = executable()?;
+    if clear {
+        clear_log(serial, cancel)?;
+    }
+    let mut parse = |line: &str| Some(parse_line(line));
+    let (ok, stderr) = match process::stream_batched(
+        command(&adb, serial, Some(TAIL_LINES)),
+        cancel,
+        BATCH_IDLE,
+        BATCH_MAX,
+        &mut parse,
+        on_batch,
+    ) {
+        Ok(result) => result,
+        // The window closed or switched devices: stopping is the expected end.
+        Err(e) if e.kind == ide_core::error::ErrorKind::Cancelled => return Ok(()),
+        Err(e) => return Err(e),
+    };
+    if ok || cancel.is_cancelled() {
+        return Ok(());
+    }
+    // `-T` is old (API 21) but adb forwards logcat options it does not know on
+    // very old devices; retry without the history rather than showing nothing.
+    let unsupported = stderr.iter().any(|line| {
+        line.contains("Unrecognized option") || line.contains("unknown option") || line.contains("Invalid option")
+    });
+    if unsupported {
+        let (ok, stderr) = match process::stream_batched(
+            command(&adb, serial, None),
+            cancel,
+            BATCH_IDLE,
+            BATCH_MAX,
+            &mut parse,
+            on_batch,
+        ) {
+            Ok(result) => result,
+            Err(e) if e.kind == ide_core::error::ErrorKind::Cancelled => return Ok(()),
+            Err(e) => return Err(e),
+        };
+        if ok || cancel.is_cancelled() {
+            return Ok(());
+        }
+        return Err(failure(serial, &stderr));
+    }
+    Err(failure(serial, &stderr))
+}
+
+fn failure(serial: &str, stderr: &[String]) -> IdeError {
+    let message = stderr.join("\n");
+    IdeError::unavailable(if message.trim().is_empty() {
+        format!("adb logcat on {serial} stopped")
+    } else {
+        format!("adb logcat on {serial} stopped: {message}")
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn adb_candidates_are_absolute() {
+        for root in sdk_roots() {
+            assert!(root.is_absolute(), "{root:?}");
+        }
+    }
+
+    #[test]
+    fn executable_is_absolute_when_found() {
+        if let Some(adb) = adb_executable() {
+            assert!(adb.is_absolute());
+            assert!(adb.is_file());
+        }
+    }
+}

crates/ide-android/src/model.rs

@@ -0,0 +1,276 @@
+//! What the Logcat tool window shows: the devices `adb` reports and the lines
+//! `adb logcat` prints, parsed from its `threadtime` format.
+
+use serde::{Deserialize, Serialize};
+use specta::Type;
+
+/// One entry of `adb devices -l`.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct AndroidDevice {
+    /// `adb -s` value: a USB serial number, `emulator-5554`, or `host:port`.
+    pub serial: String,
+    /// `device` (usable), `offline`, `unauthorized` or `no permissions`.
+    pub state: String,
+    pub model: Option<String>,
+    pub product: Option<String>,
+    /// The device's own name from the build (`ro.product.device`).
+    pub device: Option<String>,
+    pub transport_id: Option<String>,
+}
+
+impl AndroidDevice {
+    /// Ready for `logcat` / `install`.
+    pub fn is_online(&self) -> bool {
+        self.state == "device"
+    }
+
+    /// What the picker calls it: the model when known, the serial otherwise.
+    pub fn label(&self) -> &str {
+        self.model.as_deref().filter(|m| !m.trim().is_empty()).unwrap_or(&self.serial)
+    }
+}
+
+/// The single-letter logcat priority, in increasing severity.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub enum LogcatLevel {
+    Verbose,
+    Debug,
+    Info,
+    Warn,
+    Error,
+    Fatal,
+    /// A line logcat prints outside the message format (`--------- beginning of main`).
+    Unknown,
+}
+
+impl LogcatLevel {
+    pub fn letter(self) -> char {
+        match self {
+            Self::Verbose => 'V',
+            Self::Debug => 'D',
+            Self::Info => 'I',
+            Self::Warn => 'W',
+            Self::Error => 'E',
+            Self::Fatal => 'F',
+            Self::Unknown => '?',
+        }
+    }
+
+    fn parse(c: char) -> Self {
+        match c.to_ascii_uppercase() {
+            'V' => Self::Verbose,
+            'D' => Self::Debug,
+            'I' => Self::Info,
+            'W' => Self::Warn,
+            'E' => Self::Error,
+            'F' | 'A' => Self::Fatal,
+            _ => Self::Unknown,
+        }
+    }
+}
+
+/// One [`LogcatLevel`]-tagged line of `adb logcat -v threadtime`.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct LogcatLine {
+    /// `MM-DD HH:MM:SS.mmm`, as logcat prints it (no year, device time zone).
+    pub time: String,
+    pub pid: i32,
+    pub tid: i32,
+    pub level: LogcatLevel,
+    pub tag: String,
+    pub message: String,
+}
+
+impl LogcatLine {
+    /// A line logcat printed outside the message format, kept so nothing is lost.
+    fn unparsed(text: &str) -> Self {
+        Self {
+            time: String::new(),
+            pid: 0,
+            tid: 0,
+            level: LogcatLevel::Unknown,
+            tag: String::new(),
+            message: text.to_owned(),
+        }
+    }
+}
+
+/// Parses `adb devices -l` output; the daemon's chatter on stderr is not included.
+pub fn parse_devices(output: &str) -> Vec<AndroidDevice> {
+    let mut devices: Vec<AndroidDevice> = Vec::new();
+    for line in output.lines() {
+        let line = line.trim_end();
+        if line.trim().is_empty() || line.starts_with("List of devices") || line.starts_with('*') {
+            continue;
+        }
+        let mut fields = line.split_whitespace();
+        let (Some(serial), Some(state)) = (fields.next(), fields.next()) else {
+            continue;
+        };
+        // "no permissions (user in plugdev group; are your udev rules wrong?)"
+        // is the one state that carries spaces; the rest is a `key:value` list.
+        let mut device = AndroidDevice {
+            serial: serial.to_owned(),
+            state: state.to_owned(),
+            model: None,
+            product: None,
+            device: None,
+            transport_id: None,
+        };
+        if device.state == "no" {
+            device.state = "no permissions".to_owned();
+            devices.push(device);
+            continue;
+        }
+        for field in fields {
+            let Some((key, value)) = field.split_once(':') else {
+                continue;
+            };
+            match key {
+                "model" => device.model = Some(value.to_owned()),
+                "product" => device.product = Some(value.to_owned()),
+                "device" => device.device = Some(value.to_owned()),
+                "transport_id" => device.transport_id = Some(value.to_owned()),
+                _ => {}
+            }
+        }
+        devices.push(device);
+    }
+    // Online first, then by name, so the picker's default is the device in hand.
+    devices.sort_by(|a, b| b.is_online().cmp(&a.is_online()).then_with(|| a.serial.cmp(&b.serial)));
+    devices
+}
+
+/// Parses one `logcat -v threadtime` line:
+///
+/// ```text
+/// 11-04 12:52:39.123  3048  3059 I WindowManager: displayed
+/// ```
+///
+/// Text that does not follow the format still becomes a line, so a device that
+/// prints something unexpected does not look like a dead stream.
+pub fn parse_line(text: &str) -> LogcatLine {
+    let Some(line) = parse_formatted(text) else {
+        return LogcatLine::unparsed(text);
+    };
+    line
+}
+
+fn parse_formatted(text: &str) -> Option<LogcatLine> {
+    // "MM-DD HH:MM:SS.mmm" is 18 bytes; logcat pads the rest with spaces.
+    let stamp = text.get(..18)?;
+    if !looks_like_stamp(stamp) {
+        return None;
+    }
+    let mut rest = text.get(18..)?;
+    let pid: i32 = take_field(&mut rest)?.parse().ok()?;
+    let tid: i32 = take_field(&mut rest)?.parse().ok()?;
+    let level = LogcatLevel::parse(take_field(&mut rest)?.chars().next()?);
+    let tail = rest.trim_start();
+    // "Tag            : message": logcat pads the tag to 8 columns, and the tag
+    // itself never contains a colon followed by a space.
+    let (tag, message) = match tail.split_once(": ") {
+        Some((tag, message)) => (tag.trim_end(), message),
+        None => (tail.trim_end(), ""),
+    };
+    Some(LogcatLine { time: stamp.to_owned(), pid, tid, level, tag: tag.to_owned(), message: message.to_owned() })
+}
+
+/// Consumes the next space-separated field of `rest`, leaving the remainder.
+fn take_field<'a>(rest: &mut &'a str) -> Option<&'a str> {
+    *rest = rest.trim_start();
+    if rest.is_empty() {
+        return None;
+    }
+    let end = rest.find(char::is_whitespace).unwrap_or(rest.len());
+    let field = &rest[..end];
+    *rest = &rest[end..];
+    Some(field)
+}
+
+fn looks_like_stamp(s: &str) -> bool {
+    let bytes = s.as_bytes();
+    bytes.len() == 18
+        && bytes[2] == b'-'
+        && bytes[5] == b' '
+        && bytes[8] == b':'
+        && bytes[11] == b':'
+        && bytes[14] == b'.'
+        && bytes.iter().enumerate().all(|(i, b)| matches!(i, 2 | 5 | 8 | 11 | 14) || b.is_ascii_digit())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn reads_adb_devices_with_attributes() {
+        let out = "\
+List of devices attached
+HT7A1B2C3D4           device product:generic model:Generic_Phone device:generic transport_id:1
+emulator-5554          offline transport_id:2
+0123456789ABCDEF       unauthorized usb:1-1 transport_id:3
+
+";
+        let devices = parse_devices(out);
+        assert_eq!(devices.len(), 3);
+        // Online first, then by serial.
+        assert_eq!(devices[0].serial, "HT7A1B2C3D4");
+        assert_eq!(devices[0].state, "device");
+        assert_eq!(devices[0].model.as_deref(), Some("Generic_Phone"));
+        assert_eq!(devices[0].transport_id.as_deref(), Some("1"));
+        assert!(devices[0].is_online());
+        assert_eq!(devices[1].serial, "0123456789ABCDEF");
+        assert_eq!(devices[1].state, "unauthorized");
+        assert_eq!(devices[1].label(), "0123456789ABCDEF");
+        assert_eq!(devices[2].serial, "emulator-5554");
+        assert!(!devices[2].is_online());
+    }
+
+    #[test]
+    fn reads_adb_devices_when_the_list_is_empty() {
+        assert!(parse_devices("List of devices attached\n\n").is_empty());
+    }
+
+    #[test]
+    fn reads_no_permissions() {
+        let devices = parse_devices("ABC\tno permissions (user in plugdev group; are your udev rules wrong?)\n");
+        assert_eq!(devices.len(), 1);
+        assert_eq!(devices[0].state, "no permissions");
+    }
+
+    #[test]
+    fn parses_a_threadtime_line() {
+        let line = parse_line("11-04 12:52:39.123  3048  3059 I WindowManager: Displayed activity");
+        assert_eq!(line.time, "11-04 12:52:39.123");
+        assert_eq!(line.pid, 3048);
+        assert_eq!(line.tid, 3059);
+        assert_eq!(line.level, LogcatLevel::Info);
+        assert_eq!(line.tag, "WindowManager");
+        assert_eq!(line.message, "Displayed activity");
+    }
+
+    #[test]
+    fn keeps_colons_in_the_message() {
+        let line = parse_line("11-04 12:52:39.123  3048  3059 E flutter : java.lang.IllegalStateException: boom");
+        assert_eq!(line.tag, "flutter");
+        assert_eq!(line.level, LogcatLevel::Error);
+        assert_eq!(line.message, "java.lang.IllegalStateException: boom");
+    }
+
+    #[test]
+    fn keeps_lines_outside_the_format() {
+        let line = parse_line("--------- beginning of main");
+        assert_eq!(line.level, LogcatLevel::Unknown);
+        assert_eq!(line.message, "--------- beginning of main");
+    }
+
+    #[test]
+    fn levels_order_by_severity() {
+        assert!(LogcatLevel::Warn > LogcatLevel::Info);
+        assert!(LogcatLevel::Fatal > LogcatLevel::Error);
+    }
+}

crates/ide-android/src/process.rs

@@ -0,0 +1,206 @@
+//! Child processes of the `adb` CLI: bounded runs, and cancellable line streams
+//! that are handed over in batches (logcat is far too chatty for one message a line).
+
+use ide_core::process::terminate_tree;
+use ide_core::{CancellationToken, IdeError, IdeResult};
+use std::io::Read;
+use std::process::{Child, Command, Stdio};
+use std::sync::mpsc;
+use std::time::{Duration, Instant};
+
+/// How long a cancelled child gets to exit on `SIGTERM` (and flush) before `SIGKILL`.
+const KILL_GRACE: Duration = Duration::from_millis(20);
+
+pub(crate) struct Output {
+    pub stdout: String,
+    pub stderr: String,
+    pub success: bool,
+}
+
+fn prepare(cmd: &mut Command) {
+    cmd.stdin(Stdio::null()).stdout(Stdio::piped()).stderr(Stdio::piped());
+    ide_core::process::prepare(ide_core::process::own_group(cmd));
+}
+
+fn spawn(cmd: &mut Command) -> IdeResult<Child> {
+    cmd.spawn().map_err(|e| IdeError::unavailable(format!("could not run adb: {e}")))
+}
+
+fn read_all(mut pipe: impl Read + Send + 'static) -> std::thread::JoinHandle<String> {
+    std::thread::spawn(move || {
+        let mut buf = Vec::new();
+        let _ = pipe.read_to_end(&mut buf);
+        ide_core::output_encoding::decode_tool_output(&buf)
+    })
+}
+
+/// Runs `cmd` to completion. Fails when it outlives `timeout` or `cancel` fires;
+/// a non-zero exit is reported in [`Output::success`], not as an error.
+pub(crate) fn run(mut cmd: Command, timeout: Duration, cancel: Option<&CancellationToken>) -> IdeResult<Output> {
+    prepare(&mut cmd);
+    let mut child = spawn(&mut cmd)?;
+    let out = child.stdout.take().map(read_all);
+    let err = child.stderr.take().map(read_all);
+    let deadline = Instant::now() + timeout;
+    let status = loop {
+        if let Some(status) = child.try_wait()? {
+            break status;
+        }
+        if cancel.is_some_and(CancellationToken::is_cancelled) {
+            terminate_tree(&mut child, KILL_GRACE);
+            return Err(IdeError::cancelled());
+        }
+        if Instant::now() >= deadline {
+            terminate_tree(&mut child, KILL_GRACE);
+            return Err(IdeError::unavailable("adb did not respond in time"));
+        }
+        std::thread::sleep(Duration::from_millis(10));
+    };
+    Ok(Output {
+        stdout: out.map(|t| t.join().unwrap_or_default()).unwrap_or_default(),
+        stderr: err.map(|t| t.join().unwrap_or_default()).unwrap_or_default(),
+        success: status.success(),
+    })
+}
+
+enum Event {
+    Line(bool, String),
+    Closed,
+}
+
+fn spawn_reader(mut pipe: impl Read + Send + 'static, tx: mpsc::Sender<Event>, stdout: bool) {
+    std::thread::spawn(move || {
+        let mut buf = [0u8; 8192];
+        let mut pending: Vec<u8> = Vec::new();
+        let flush = |pending: &mut Vec<u8>| {
+            if !pending.is_empty() {
+                let line = ide_core::output_encoding::decode_tool_output(pending);
+                pending.clear();
+                let _ = tx.send(Event::Line(stdout, line.trim_end().to_string()));
+            }
+        };
+        loop {
+            match pipe.read(&mut buf) {
+                Ok(0) | Err(_) => break,
+                Ok(n) => {
+                    for &b in &buf[..n] {
+                        if b == b'\n' {
+                            flush(&mut pending);
+                        } else if b != b'\r' {
+                            pending.push(b);
+                        }
+                    }
+                }
+            }
+        }
+        flush(&mut pending);
+        let _ = tx.send(Event::Closed);
+    });
+}
+
+fn flush<T>(batch: &mut Vec<T>, on_batch: &mut dyn FnMut(Vec<T>)) {
+    if !batch.is_empty() {
+        on_batch(std::mem::take(batch));
+    }
+}
+
+/// Runs `cmd`, parsing every stdout line with `parse` and handing the results to
+/// `on_batch` — as soon as `max` are ready, or once the oldest waiting line is `idle`
+/// old, so neither a quiet nor a steady stream holds lines back. Stderr is kept as a
+/// tail for the error message. Returns whether the child exited successfully.
+pub(crate) fn stream_batched<T>(
+    mut cmd: Command,
+    cancel: &CancellationToken,
+    idle: Duration,
+    max: usize,
+    mut parse: impl FnMut(&str) -> Option<T>,
+    on_batch: &mut dyn FnMut(Vec<T>),
+) -> IdeResult<(bool, Vec<String>)> {
+    if cancel.is_cancelled() {
+        return Err(IdeError::cancelled());
+    }
+    prepare(&mut cmd);
+    let mut child = spawn(&mut cmd)?;
+    let (tx, rx) = mpsc::channel::<Event>();
+    let mut open = 0;
+    if let Some(out) = child.stdout.take() {
+        spawn_reader(out, tx.clone(), true);
+        open += 1;
+    }
+    if let Some(err) = child.stderr.take() {
+        spawn_reader(err, tx.clone(), false);
+        open += 1;
+    }
+    drop(tx);
+    let mut stderr_tail: Vec<String> = Vec::new();
+    let mut batch: Vec<T> = Vec::with_capacity(max);
+    // When the first line of the waiting batch arrived.
+    let mut since = Instant::now();
+    while open > 0 {
+        if cancel.is_cancelled() {
+            terminate_tree(&mut child, KILL_GRACE);
+            return Err(IdeError::cancelled());
+        }
+        let wait = if batch.is_empty() { idle } else { idle.saturating_sub(since.elapsed()) };
+        match rx.recv_timeout(wait) {
+            Ok(Event::Line(true, line)) => {
+                if let Some(item) = parse(&line) {
+                    if batch.is_empty() {
+                        since = Instant::now();
+                    }
+                    batch.push(item);
+                    if batch.len() >= max || since.elapsed() >= idle {
+                        flush(&mut batch, on_batch);
+                    }
+                }
+            }
+            Ok(Event::Line(false, line)) => {
+                if !line.trim().is_empty() {
+                    stderr_tail.push(line);
+                    if stderr_tail.len() > 20 {
+                        stderr_tail.remove(0);
+                    }
+                }
+            }
+            Ok(Event::Closed) => open -= 1,
+            Err(mpsc::RecvTimeoutError::Timeout) => flush(&mut batch, on_batch),
+            Err(mpsc::RecvTimeoutError::Disconnected) => break,
+        }
+    }
+    flush(&mut batch, on_batch);
+    let status = loop {
+        if let Some(status) = child.try_wait()? {
+            break status;
+        }
+        if cancel.is_cancelled() {
+            terminate_tree(&mut child, KILL_GRACE);
+            return Err(IdeError::cancelled());
+        }
+        std::thread::sleep(Duration::from_millis(10));
+    };
+    Ok((status.success(), stderr_tail))
+}
+
+#[cfg(all(test, unix))]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn a_steady_stream_is_handed_over_while_it_runs() {
+        let mut cmd = Command::new("sh");
+        cmd.args(["-c", "for i in $(seq 1 20); do echo $i; sleep 0.02; done"]);
+        let mut sizes = Vec::new();
+        let (ok, _) = stream_batched(
+            cmd,
+            &CancellationToken::new(),
+            Duration::from_millis(60),
+            300,
+            |line| Some(line.to_owned()),
+            &mut |batch| sizes.push(batch.len()),
+        )
+        .unwrap();
+        assert!(ok);
+        assert_eq!(sizes.iter().sum::<usize>(), 20);
+        assert!(sizes.len() >= 3, "lines arriving every 20 ms waited for the end: {sizes:?}");
+    }
+}

crates/ide-android/tests/device.rs

@@ -0,0 +1,65 @@
+//! Drives a real device through `adb`, checking what the Logcat tool window does:
+//! that the device list parses, that the stream delivers batches, and that
+//! cancelling stops both the stream and its `adb` process.
+//!
+//! Ignored by default (needs a connected device). Run with
+//! `OPENIDEA_ADB_DEVICE=<serial> cargo test -p ide-android --test device -- --ignored --nocapture`
+//! — without the variable, the connected device is used when there is exactly one.
+
+use ide_android::*;
+use ide_core::CancellationToken;
+use std::sync::{Arc, Mutex};
+use std::time::{Duration, Instant};
+
+fn serial() -> Option<String> {
+    if let Ok(serial) = std::env::var("OPENIDEA_ADB_DEVICE") {
+        return Some(serial);
+    }
+    let online = devices().ok()?.into_iter().filter(AndroidDevice::is_online).collect::<Vec<_>>();
+    (online.len() == 1).then(|| online[0].serial.clone())
+}
+
+#[test]
+#[ignore]
+fn finds_the_adb_executable() {
+    let adb = adb_executable().expect("adb (set ANDROID_HOME or OPENIDEA_ADB)");
+    println!("adb: {}", adb.display());
+    assert!(adb.is_file());
+}
+
+#[test]
+#[ignore]
+fn lists_connected_devices() {
+    let devices = devices().expect("adb devices");
+    for device in &devices {
+        println!("{:<16} {:<14} {} ({:?})", device.serial, device.state, device.label(), device.transport_id);
+    }
+    assert!(!devices.is_empty(), "no devices connected");
+}
+
+#[test]
+#[ignore]
+fn streams_batches_and_stops_on_cancel() {
+    let serial = serial().expect("a single connected device, or OPENIDEA_ADB_DEVICE");
+    let cancel = CancellationToken::new();
+    let stop = cancel.clone();
+    let received = Arc::new(Mutex::new(Vec::<LogcatLine>::new()));
+    let sink = received.clone();
+    let started = Instant::now();
+    let stream = std::thread::spawn(move || {
+        ide_android::logcat(&serial, false, &stop, &mut |batch| {
+            sink.lock().unwrap().extend(batch);
+        })
+    });
+    // Enough to see the tail seed and a few live lines from a device that idles.
+    std::thread::sleep(Duration::from_secs(4));
+    cancel.cancel();
+    stream.join().unwrap().expect("logcat stops cleanly when cancelled");
+    let lines = received.lock().unwrap();
+    println!("{} lines in {:?}", lines.len(), started.elapsed());
+    for line in lines.iter().rev().take(5) {
+        println!("{:<14} {:>6} {}", line.tag, line.pid, line.message);
+    }
+    assert!(!lines.is_empty(), "no lines within 4s");
+    assert!(lines.iter().any(|l| l.level != LogcatLevel::Unknown), "every line failed to parse");
+}

crates/ide-build/Cargo.toml

@@ -6,16 +6,15 @@ edition.workspace = true
 license.workspace = true
 
 [dependencies]
+blake3.workspace = true
 dunce.workspace = true
 ide-core.workspace = true
+zip.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 specta.workspace = true
 tracing.workspace = true
 dirs.workspace = true
 
-[target.'cfg(unix)'.dependencies]
-libc = "0.2"
-
 [dev-dependencies]
 tempfile.workspace = true

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_for_module(root, &module)
+        && 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 = vec![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());
+    }
+}