refactor(core): simplify request preparation

Co-authored-by: Kit Langton <7587245+kitlangton@users.noreply.github.com>

.changeset/promise-plugin-adapter.md

@@ -0,0 +1,5 @@
+---
+"@opencode-ai/plugin": patch
+---
+
+Derive Promise plugin API request and response conversion from the canonical protocol schemas.

.changeset/share-session-model-request.md

@@ -0,0 +1,5 @@
+---
+"@opencode-ai/core": patch
+---
+
+Apply shared Session model-request preparation to transient generation.

.changeset/shell-permission-scan.md

@@ -0,0 +1,9 @@
+---
+"@opencode-ai/core": minor
+"@opencode-ai/schema": minor
+"@opencode-ai/protocol": minor
+"@opencode-ai/client": minor
+---
+
+Add an opt-in portable shell permission scanner. Opaque commands use normal shell authorization without inferring
+external directories, while the default tree-sitter path remains unchanged.

.github/workflows/deploy-lab-catalog.yml

@@ -1,49 +0,0 @@
-name: deploy-lab-catalog
-
-on:
-  push:
-    branches: [v2]
-    paths:
-      - ".github/workflows/deploy-lab-catalog.yml"
-      - "bun.lock"
-      - "package.json"
-      - "packages/drive/**"
-      - "packages/protocol/src/simulation.ts"
-      - "packages/simulation/**"
-      - "packages/lab/catalog/**"
-  workflow_dispatch:
-
-concurrency:
-  group: deploy-lab-catalog-${{ github.ref_name }}
-  cancel-in-progress: false
-
-permissions:
-  contents: read
-
-jobs:
-  deploy:
-    if: github.repository == 'anomalyco/opencode' && github.ref_name == 'v2'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
-
-      - uses: ./.github/actions/setup-bun
-
-      - name: Install ffmpeg
-        run: |
-          sudo apt-get update
-          sudo apt-get install --yes ffmpeg
-
-      - name: Validate
-        run: |
-          bun --cwd packages/protocol typecheck
-          bun --cwd packages/simulation typecheck
-          bun --cwd packages/drive run check
-          bun --cwd packages/drive run test
-          bun --cwd packages/lab/catalog run check
-
-      - name: Deploy
-        working-directory: packages/lab/catalog
-        run: bun run deploy
-        env:
-          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}

.github/workflows/test.yml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Run unit tests
         timeout-minutes: 20
-        run: GITHUB_ACTIONS=false bun turbo test ${{ runner.os == 'Windows' && '--filter=!opencode-drive' || '' }}
+        run: GITHUB_ACTIONS=false bun turbo test
         env:
           OPENCODE_EXPERIMENTAL_DISABLE_FILEWATCHER: ${{ runner.os == 'Windows' && 'true' || 'false' }}
 

.opencode/skills/opencode-drive/SKILL.md

@@ -1,253 +0,0 @@
----
-name: opencode-drive
-description: Use when an agent needs drive OpenCode via a script or interact with an isolated instance
----
-
-# OpenCode Drive
-
-Use `opencode-drive` to launch an isolated OpenCode instance and control it via commands or a script.
-
-There are two modes. Always default to using a script unless specifically directed to be interactive (connect
-to an existing running instance, or start a new one, and make a few changes to the UI and read it, and iterate
-on changes).
-
-Scripts allow you to run a full walkthrough in one run. When the script is done opencode-drive exits,
-stops all processes, and cleans up all artifacts.
-
-# Prepare The Environment
-
-Use `init` when files must be added to the isolated home or project before OpenCode starts. It prints the artifact directory without launching OpenCode. A later `start` with the same name reuses it.
-
-```bash
-artifacts=$(opencode-drive init --name demo)
-cp -R ./fixtures/home/. "$artifacts/"
-cp -R ./fixtures/project/. "$artifacts/files/"
-opencode-drive start --name demo --dev ~/projects/opencode
-```
-
-The simulated project is under `$artifacts/files`. Running `start` without a prior `init` initializes the artifacts automatically.
-
-# Scripted usage
-
-You can write scripts that walk through entire flows, and gives you full access to controlling
-the backend too. See examples of the script API at the bottom of this file.
-
-After creating or editing a script, always typecheck it before running. Never skip this step:
-
-```bash
-opencode-drive check ./reproduce-stale-exploring-empty.ts
-```
-
-Run it by passing `--script` to start:
-
-```bash
-opencode-drive start --name auto-stop-reproduction --script ./reproduce-stale-exploring-empty.ts
-```
-
-It will output information about the run, including paths to log files which you can read
-to inspect what happened. If you need to dig into failures that aren't clear, read those log
-files. If the script is unsuccessful, automatically fix the script and run it again.
-
-Scripts use one typed definition object. `setup` runs before OpenCode starts,
-and `fs.writeFile` always writes inside the simulated project.
-
-You can read the full typed API here: https://raw.githubusercontent.com/anomalyco/opencode/v2/packages/drive/src/script/types.ts
-
-```ts
-import { defineScript } from "opencode-drive"
-
-export default defineScript({
-  async setup({ fs, config }) {
-    config.autoupdate = false
-    await fs.writeFile("src/example.ts", "export const value = 1\n")
-  },
-
-  async run({ ui, llm }) {
-    await ui.submit("Open src/example.ts")
-    await llm.send(llm.text("The file exports `value`."))
-    await ui.waitFor("The file exports `value`.")
-  },
-})
-```
-
-`setup` receives the current OpenCode config object, which starts from the
-default drive config unless the prepared instance already has one. When a script
-needs custom config, mutate this `config` parameter instead of generating and
-writing a new config object from scratch, so the script keeps the default
-provider/model settings unless it intentionally changes them.
-
-Note that the simulated model is a GPT model type, and opencode uses the `patch` tool for working with files Do not use a `edit` or `write` tool to edit files.
-
-Use `launch: "manual"` when the script needs to launch the server and every TUI
-itself (this is extremely rare, do not use this unless explicitly asked). In this
-mode `ui` is typed as `null`; call `server.launch()` exactly
-once before launching clients. Each `clients.launch(name)` result provides the
-same UI methods as the automatic client. You can see an example of this API
-here: https://raw.githubusercontent.com/anomalyco/opencode/v2/packages/drive/examples/multiple-clients.ts
-
-Use the exported `wait(milliseconds)` utility for an unconditional delay.
-
-`await llm.send(...)` waits for the next request and resolves after OpenCode
-acknowledges its complete response. `llm.queue(...)` declares responses in
-advance. Chunks may be built with `text`, `reasoning`, `toolCall`, `raw`,
-`finish`, and `disconnect`. A normal response receives `finish("stop")`
-automatically unless it yields or queues an explicit terminal event.
-
-`llm.text(text, { delay, chunkSize })` defaults to a 2 ms delay and a
-15-character target varied by plus or minus 5 per chunk.
-
-`llm.reasoning` accepts the same options, and `llm.pause(milliseconds)` adds a
-delay between any two outputs.
-
-Use `llm.serve` for an ongoing typed response generator:
-
-```ts
-llm.serve(async function* (request, index) {
-  yield llm.reasoning(`Handling request ${index + 1}`)
-  yield llm.text(`Received ${request.id}`)
-  yield llm.finish("stop")
-})
-```
-
-The backend connection, response cleanup, cancellation, and recording
-completion are automatic.
-
-You can see some example scripts here:
-
-- https://raw.githubusercontent.com/anomalyco/opencode/v2/packages/drive/examples/simple.ts
-- https://raw.githubusercontent.com/anomalyco/opencode/v2/packages/drive/examples/serve.ts
-
-## Prune
-
-- `prune` removes artifact directories. These are always cleaned up after running a script
-  successfully, but leftover on failed runs. Always call this if a script fails.
-
-```bash
-opencode-drive prune --name demo
-
-// --force cleans up all artifcat directories
-opencode-dirve prune --force
-```
-
-# Live interaction usage
-
-- Always give headless instances a unique `--name`. Visible instances may omit it.
-- A normal headless `start` detaches automatically and returns after the instance is ready.
-- Do not add `&`; the long-running owner already runs in the background.
-- Configure simulated model responses after startup when needed.
-- Send ordered UI commands with `send`.
-- Always stop the instance when finished.
-
-```bash
-opencode-drive start --name demo
-
-opencode-drive send --name demo \
-  --command.ui.type '{"text":"Explain this project"}' \
-  --command.ui.enter
-
-opencode-drive stop --name demo
-```
-
-## Send UI Commands
-
-- Every `send` opens a connection to the named instance, runs its commands in order, and exits.
-- Combine typing and Enter in one command when submitting a prompt.
-- JSON-valued commands require one JSON argument.
-- Multiple command flags execute from left to right.
-
-Commands:
-
-- `--command.ui.type <json>` types into the focused editor. Arguments: `text` string.
-- `--command.ui.press <json>` presses a key. Arguments: `key` string; optional `modifiers` object with boolean `ctrl`, `shift`, `meta`, `super`, or `hyper`.
-- `--command.ui.enter` presses Enter. Arguments: none.
-- `--command.ui.arrow <json>` presses an arrow key. Arguments: `direction` is `up`, `down`, `left`, or `right`.
-- `--command.ui.focus <json>` focuses an element. Arguments: `target` is the numeric element `num` returned by `ui.state`.
-- `--command.ui.click <json>` clicks an element. Arguments: numeric `target`, `x`, and `y`; use the element `num` returned by `ui.state` as `target`.
-- `--command.ui.state` prints focus and interactive element metadata as JSON. Arguments: none.
-- `--command.ui.matches <json>` prints whether literal, case-sensitive text appears on screen. Arguments: `text` string.
-
-```bash
-opencode-drive send --name demo \
-  --command.ui.type '{"text":"Find the relevant code and explain it"}' \
-  --command.ui.enter
-
-opencode-drive send --name demo \
-  --command.ui.press '{"key":"p","modifiers":{"ctrl":true}}'
-
-opencode-drive send --name demo \
-  --command.ui.arrow '{"direction":"down"}'
-
-opencode-drive send --name demo \
-  --command.ui.focus '{"target":12}'
-
-opencode-drive send --name demo \
-  --command.ui.click '{"target":12,"x":4,"y":1}'
-
-opencode-drive send --name demo \
-  --command.ui.matches '{"text":"OpenCode"}'
-```
-
-To read the UI state and see information about interactable elements, use the `ui.state` command:
-
-```bash
-opencode-drive send --name demo --command.ui.state
-```
-
-## Configure LLM Responses
-
-- `responses` controls what the LLM responds with
-- Only use this if you are wanting to reproduce an exact type of response
-- Defaults are `text,reasoning,diff,tool` with `write,apply_patch`.
-- Supported types are `text`, `reasoning`, `diff`, and `tool`.
-- `--tools` limits generated tool calls to names offered by OpenCode.
-
-```bash
-opencode-drive responses --name demo \
-  --types text,reasoning,diff,tool \
-  --tools write,apply_patch
-
-opencode-drive responses --name demo \
-  --types tool \
-  --tools read,glob,grep
-```
-
-## Inspect The UI
-
-- `ui.state` prints focus and interactive element metadata as JSON.
-- `ui.matches` checks for literal, case-sensitive screen text.
-- `screenshot` prints the generated image path.
-
-```bash
-opencode-drive screenshot --name demo
-```
-
-## Lifecycle
-
-- `stop` waits for recording export and owner cleanup before returning.
-
-```bash
-opencode-drive stop --name demo
-```
-
-# Record The UI
-
-- Start with `--record` to capture a headless instance from its first rendered frame.
-- `stop` finishes the recording, exports an MP4, and prints its path.
-
-```bash
-opencode-drive start --name demo --record
-
-opencode-drive send --name demo \
-  --command.ui.type '{"text":"Show me the current architecture"}' \
-  --command.ui.enter
-
-opencode-drive stop --name demo
-```
-
-# Artifacts dir
-
-- `dir` prints the artifact directory for the instance.
-
-```bash
-opencode-drive dir --name demo
-```

AGENTS.md

@@ -12,6 +12,20 @@
 - The script discovers the server with `opencode2 service status`, injects its private local credential from `opencode2 service get password`, and uses the `next` TUI storage channel so tabs and other client-local state match the installed client.
 - Prefer `dev:live` over plain `bun run dev` for this workflow. An implicit managed-service connection may replace the live server when the worktree client version differs; explicit `--server` warns and continues without replacing it.
 
+## V2 TUI Stories
+
+- When a user asks for a TUI story, add a fixture-driven story under `packages/tui/src/feature-plugins/system/storybook` and register it in `index.tsx`.
+- Render the real production component rather than a visual copy. Keep submissions and other side effects local to the story so it is safe to explore repeatedly.
+- Expose the meaningful state dimensions through story keybindings and list them in `StoryFooter`; include a reset command when combinations can leave the fixture in a confusing state.
+- Run a specific story with `OPENCODE_STORY=<story-id> bun run dev:live` from the development worktree, and exercise narrow and wide terminal sizes when layout is relevant.
+
+## TUI Theme Tokens
+
+- Choose theme tokens by semantic role, not by their current color. Do not use raw `theme.hue` values or borrow an unrelated semantic token to achieve a preferred appearance.
+- Use `text.feedback` and `background.feedback` only for outcome or status feedback such as errors, warnings, success messages, and informational messages. Use `formfield` states for form-control text, ordinals, and selection markers, and `action` states for actions.
+- If the theme does not expose a token for the required semantic role, extend the theme schema, defaults, resolution, and types with that role before using it in a component. Do not repurpose the nearest-looking existing token.
+- When changing the public theme token surface, verify the built-in light and dark defaults and the custom-theme fallback path in addition to the affected TUI component.
+
 ## Branch Names
 
 Use a short branch name of at most three words, separated by hyphens. Do not use slashes or type prefixes such as `feat/` or `fix/`.
@@ -161,14 +175,14 @@ const table = sqliteTable("session", {
 ## V2 Session Core
 
 - Keep durable events minimal: record irreducible new facts and do not repeat state derivable by folding the ordered aggregate history. Enrich projections and read models with previous or derived state when consumers need self-contained views.
-- Keep durable prompt admission separate from model execution. `SessionV2.prompt(...)` admits one durable `session_pending` row before scheduling advisory `SessionExecution.wake(sessionID)` unless `resume: false` requests admit-only behavior. The serialized runner promotes admitted inputs into visible user messages at safe boundaries, consuming the pending row in the same event transaction; `session_pending` stores only unconsumed work.
-- Reusing a Session ID adopts the existing Session. Reusing a prompt message ID reconciles an exact retry only when Session, prompt, and delivery mode match; conflicting reuse fails. Retry of an already-promoted input reconciles against the projected message and the durable admitted event rather than a retained row.
+- Keep durable prompt admission separate from model execution. `Session.prompt(...)` publishes `session.inbox.enqueued`, whose projection inserts one durable `session_inbox` row, before scheduling advisory `SessionExecution.wake(sessionID)` unless `resume: false` requests admit-only behavior. Delivery publishes `session.inbox.delivered`; its projection consumes the inbox row and inserts the visible message in the same transaction. `session_inbox` stores only unconsumed work.
+- Reusing a Session ID adopts the existing Session. While a user or synthetic inbox item is pending, reusing its ID reconciles only when Session, type, complete payload, metadata, and delivery match; conflicting reuse fails. Once delivered, retry reconciliation for those message-producing items uses the projected message and does not require retained enqueue history or the original delivery mode. Control items keep their operation-specific conflict behavior.
 - Keep `SessionExecution` process-global and Session-ID based. Its local implementation owns the process-local Session coordinator and discovers placement through `SessionStore` plus `LocationServiceMap.get(session.location)` only when a drain starts; no layer should take a Session ID. V2 interruption targets the active process-local ownership chain for that Session; interruption of a known but idle or locally unowned Session is a no-op, while the public API rejects an unknown Session.
 - Keep `SessionRunner`, model resolution, tool registry, permissions, and filesystem Location-scoped. Omitted `Location.workspaceID` means implicit-local placement; explicit workspace identity remains reserved for future placement semantics.
-- Preserve one explicit `llm.stream(request)` call per Physical Attempt and reload projected history before durable continuation. Most Steps have one Physical Attempt; overflow-triggered compaction recovery may rebuild one Step for a second attempt. Do not bridge through legacy `SessionPrompt.loop(...)` or delegate orchestration to an in-memory tool loop.
-- Keep local Session drains process-local until clustering is implemented. `SessionRunCoordinator` joins explicit same-Session resumes, coalesces prompt wakeups, and allows different Sessions to run concurrently. Advisory wakes drain eligible durable inbox rows only; post-crash continuation recovery requires a separate explicit design before it may retry provider work. A drain has no durable identity or transcript boundary.
-- Keep delivery vocabulary explicit. Prompts steer by default and promote at the next safe step boundary while the current drain requires continuation. An explicit `queue` input remains pending until the Session would otherwise become idle; promote one queued input at that boundary, then reevaluate continuation before promoting another. Promoting any new user input resets the selected agent's step allowance; a batch of steers resets it once.
+- Preserve one explicit `llm.stream(request)` call per Physical Attempt and reload projected history before durable continuation. A logical Step may use generic pre-output retries, one full-context retry after continuation rejection, incomplete-stream continuation, or one overflow-compaction rebuild. Generic retries retain the logical step number and do not consume another agent-step allowance. Do not bridge through legacy `SessionPrompt.loop(...)` or delegate orchestration to an in-memory tool loop.
+- Keep local Session drains process-local until clustering is implemented. `SessionRunCoordinator` joins explicit same-Session resumes, coalesces prompt wakeups, and allows different Sessions to run concurrently. A write-ahead execution claim marks a process-local busy period for restart recovery: terminal completion, failure, or user interruption releases it, while shutdown interruption and process death preserve it. Startup recovery resumes claimed top-level Sessions with durable per-execution attempt accounting. The claim is a recovery marker, not clustered ownership, fencing, or an exactly-once guarantee.
+- Keep delivery vocabulary explicit. Prompts steer by default. Steers deliver in enqueue order at safe step boundaries, stopping before compaction or move control items. At an idle boundary, steers take priority; otherwise exactly one queued item delivers before the runner reevaluates continuation. Inbox items may be cancelled or changed between queue and steer before delivery. Promoting new user input resets the selected agent's step allowance; a batch of steers resets it once.
 - One step is one logical LLM call; its durable record covers only the model-visible span. Do not write "provider turn", and do not use bare "turn" for a single call: "turn" is reserved for the future assistant-turn unit containing all steps from prompt promotion until the session would go idle.
-- Keep EventV2 replay owner claims separate from clustered Session execution ownership.
+- Keep event replay ownership separate from clustered Session execution ownership.
 - Keep the Instructions algebra and built-ins in `src/instructions`; keep instruction producers with their observed domains, and keep Session History selection plus `InstructionState` and `InstructionEntry` persistence Session-owned. `InstructionDiscovery` observes ambient global and upward-project instructions. The runner composes built-ins, discovery, guidance, and entries explicitly in `loadInstructions`; there is no instruction registry.
-- `session.instructions.updated` stores only changed source keys and content hashes. Blob values live once in `instruction_blob`; `instruction_state` is a rebuildable fold cache, never primary state. Render initial instructions and chronological updates from values during request assembly. Completed compaction moves the instruction epoch; Session movement retains it so destination instruction changes are chronological, while committed revert clears it. Unavailable sources retain the last value and block only the initial complete delta.
+- `session.instructions.updated` stores changed source keys and content hashes and may freeze rendered chronological update text. Blob values live once in `instruction_blob`; the projected `instruction_state` row is the normal boundary-processing source of current and initial values. Request assembly renders the epoch baseline from stored values, while later frozen updates enter history as durable System messages. Completed compaction moves the instruction epoch; Session movement retains it so destination instruction changes are chronological, while committed revert clears it. Forks adopt the parent's newest instruction values even when copied message history ends at an earlier boundary. Unavailable sources retain the last value and block only the initial complete delta.

CONTRIBUTING.md

@@ -1,272 +1,112 @@
 # Contributing to OpenCode
 
-We want to make it easy for you to contribute to OpenCode. Here are the most common type of changes that get merged:
+The changes most likely to be accepted are:
 
 - Bug fixes
-- Additional LSPs / Formatters
-- Improvements to LLM performance
-- Support for new providers
-- Fixes for environment-specific quirks
+- Additional LSPs and formatters
+- LLM performance improvements
+- Environment-specific fixes
 - Missing standard behavior
 - Documentation improvements
 
-However, any UI or core product feature must go through a design review with the core team before implementation.
+UI and core product features require design review before implementation. If you are unsure whether a change fits, ask a maintainer or choose an issue labeled [`help wanted`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3Ahelp-wanted), [`good first issue`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22good%20first%20issue%22), [`bug`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug), or [`perf`](https://github.com/anomalyco/opencode/issues?q=is%3Aopen%20is%3Aissue%20label%3A%22perf%22).
 
-If you are unsure if a PR would be accepted, feel free to ask a maintainer or look for issues with any of the following labels:
-
-- [`help wanted`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3Ahelp-wanted)
-- [`good first issue`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22good%20first%20issue%22)
-- [`bug`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug)
-- [`perf`](https://github.com/anomalyco/opencode/issues?q=is%3Aopen%20is%3Aissue%20label%3A%22perf%22)
+Want to take on an issue? Leave a comment and a maintainer may assign it unless it is already being worked on.
 
 > [!NOTE]
 > PRs that ignore these guardrails will likely be closed.
 
-Want to take on an issue? Leave a comment and a maintainer may assign it to you unless it is something we are already working on.
+## Adding Providers
 
-## Adding New Providers
+New providers should rarely require OpenCode changes. Add the provider to [models.dev](https://github.com/anomalyco/models.dev) first.
 
-New providers shouldn't require many if ANY code changes, but if you want to add support for a new provider first make a PR to:
-https://github.com/anomalyco/models.dev
+## Development
 
-## Developing OpenCode
-
-- Requirements: Bun 1.3+
-- Install dependencies and start the dev server from the repo root:
-
-  ```bash
-  bun install
-  bun dev
-  ```
-
-### Running against a different directory
-
-By default, `bun dev` runs OpenCode in the `packages/opencode` directory. To run it against a different directory or repository:
+OpenCode requires Bun 1.3 or newer. From the repository root:
 
 ```bash
-bun dev <directory>
+bun install
+bun dev [directory]
 ```
 
-To run OpenCode in the root of the opencode repo itself:
+`bun dev` runs the V2 CLI and TUI. Pass a directory to open another project, or `.` to open this repository.
+
+To test a development TUI against your installed OpenCode V2 background service and live sessions:
 
 ```bash
-bun dev .
+bun run dev:live [directory]
 ```
 
-### Building a "localcode"
-
-To compile a standalone executable:
+For web development, run the backend and app in separate terminals. Other interfaces have root scripts:
 
 ```bash
-./packages/opencode/script/build.ts --single
+bun dev serve --port 4096
+bun run dev:web
+bun run dev:desktop
+bun run dev:www
 ```
 
-Then run it with:
+### Packages
+
+- `packages/schema`: shared wire and storage contracts
+- `packages/core`: domain behavior and persistence
+- `packages/protocol`: public API definitions
+- `packages/server`: HTTP server and runtime composition
+- `packages/client`: generated TypeScript clients
+- `packages/cli`: command-line entrypoint and service lifecycle
+- `packages/tui`: terminal interface
+- `packages/app`: shared web interface
+- `packages/desktop`: Electron desktop application
+- `packages/plugin`: plugin API
+
+### Verification
+
+Run typechecks, and tests where defined, from the affected package rather than the repository root:
 
 ```bash
-./packages/opencode/dist/opencode-<platform>/bin/opencode
+cd packages/core
+bun run test
+bun typecheck
 ```
 
-Replace `<platform>` with your platform (e.g., `darwin-arm64`, `linux-x64`).
+Follow package-specific instructions in nearby `AGENTS.md` files. After changing the public Protocol or Server `HttpApi`, run `bun run generate` from `packages/client`; never edit generated client files directly.
 
-- Core pieces:
-  - `packages/opencode`: OpenCode core business logic & server.
-  - `packages/opencode/src/cli/cmd/tui/`: The TUI code, written in SolidJS with [opentui](https://github.com/sst/opentui)
-  - `packages/app`: The shared web UI components, written in SolidJS
-  - `packages/desktop`: The native desktop app, built with Electron (wraps `packages/app`)
-  - `packages/plugin`: Source for `@opencode-ai/plugin`
+Follow the repository [style guide](./AGENTS.md).
 
-### Understanding bun dev vs opencode
+## Pull Requests
 
-During development, `bun dev` is the local equivalent of the built `opencode` command. Both run the same CLI interface:
+### Link Issues When Required
 
-```bash
-# Development (from project root)
-bun dev --help           # Show all available commands
-bun dev serve            # Start headless API server
-bun dev web              # Start server + open web interface
-bun dev <directory>      # Start TUI in specific directory
+Bug fixes, chores, and tests must reference an existing issue. Documentation, refactor, and feature PRs are exempt from the automated linked-issue check. When required, use `Fixes #123` or `Closes #123` in the PR description.
 
-# Production
-opencode --help          # Show all available commands
-opencode serve           # Start headless API server
-opencode web             # Start server + open web interface
-opencode <directory>     # Start TUI in specific directory
-```
+Before implementing new functionality, open a feature request describing the problem, why it belongs in OpenCode, and your proposed approach if you have one. Wait for design approval before opening the implementation PR.
 
-### Running the API Server
+Base branches on `v2`, not `dev`, and complete the provided pull request template.
 
-To start the OpenCode headless API server:
+### Keep It Focused
 
-```bash
-bun dev serve
-```
+- Keep PRs small and focused.
+- Explain the problem and why the change fixes it.
+- Check whether the functionality already exists.
+- For UI changes, include before-and-after screenshots or video.
+- For logic changes, explain what you tested and how a reviewer can verify it.
 
-This starts the headless server on port 4096 by default. You can specify a different port:
+### Keep It Brief
 
-```bash
-bun dev serve --port 8080
-```
+Long, AI-generated PR descriptions and issues may be ignored. Write a short explanation in your own words. If the change cannot be explained briefly, the PR may be too large.
 
-### Running the Web App
+### Use Conventional Titles
 
-To test UI changes during development:
-
-1. **First, start the OpenCode server** (see [Running the API Server](#running-the-api-server) section above)
-2. **Then run the web app:**
-
-```bash
-bun run --cwd packages/app dev
-```
-
-This starts a local dev server at http://localhost:5173 (or similar port shown in output). Most UI changes can be tested here, but the server must be running for full functionality.
-
-### Running the Desktop App
-
-The desktop app is an Electron application that wraps the web UI.
-
-To run the desktop app in development:
-
-```bash
-bun run --cwd packages/desktop dev
-```
-
-To create a production build and package the app:
-
-```bash
-bun run --cwd packages/desktop build
-bun run --cwd packages/desktop package
-```
-
-> [!NOTE]
-> If you make changes to the API or SDK (e.g. `packages/opencode/src/server/server.ts`), run `./script/generate.ts` to regenerate the SDK and related files.
-
-Please try to follow the [style guide](./AGENTS.md)
-
-### Setting up a Debugger
-
-Bun debugging is currently rough around the edges. We hope this guide helps you get set up and avoid some pain points.
-
-The most reliable way to debug OpenCode is to run it manually in a terminal via `bun run --inspect=<url> dev ...` and attach
-your debugger via that URL. Other methods can result in breakpoints being mapped incorrectly, at least in VSCode (YMMV).
-
-Caveats:
-
-- If you want to run the OpenCode TUI and have breakpoints triggered in the server code, you might need to run `bun dev spawn` instead of
-  the usual `bun dev`. This is because `bun dev` runs the server in a worker thread and breakpoints might not work there.
-- If `spawn` does not work for you, you can debug the server separately:
-  - Debug server: `bun run --inspect=ws://localhost:6499/ --cwd packages/opencode ./src/index.ts serve --port 4096`,
-    then attach TUI with `opencode attach http://localhost:4096`
-  - Debug TUI: `bun run --inspect=ws://localhost:6499/ --cwd packages/opencode --conditions=browser ./src/index.ts`
-
-Other tips and tricks:
-
-- You might want to use `--inspect-wait` or `--inspect-brk` instead of `--inspect`, depending on your workflow
-- Specifying `--inspect=ws://localhost:6499/` on every invocation can be tiresome, you may want to `export BUN_OPTIONS=--inspect=ws://localhost:6499/` instead
-
-#### VSCode Setup
-
-If you use VSCode, you can use our example configurations [.vscode/settings.example.json](.vscode/settings.example.json) and [.vscode/launch.example.json](.vscode/launch.example.json).
-
-Some debug methods that can be problematic:
-
-- Debug configurations with `"request": "launch"` can have breakpoints incorrectly mapped and thus unusable
-- The same problem arises when running OpenCode in the VSCode `JavaScript Debug Terminal`
-
-With that said, you may want to try these methods, as they might work for you.
-
-## Pull Request Expectations
-
-### Issue First Policy
-
-**All PRs must reference an existing issue.** Before opening a PR, open an issue describing the bug or feature. This helps maintainers triage and prevents duplicate work. PRs without a linked issue may be closed without review.
-
-- Use `Fixes #123` or `Closes #123` in your PR description to link the issue
-- For small fixes, a brief issue is fine - just enough context for maintainers to understand the problem
-
-### General Requirements
-
-- Keep pull requests small and focused
-- Explain the issue and why your change fixes it
-- Before adding new functionality, ensure it doesn't already exist elsewhere in the codebase
-
-### UI Changes
-
-If your PR includes UI changes, please include screenshots or videos showing the before and after. This helps maintainers review faster and gives you quicker feedback.
-
-### Logic Changes
-
-For non-UI changes (bug fixes, new features, refactors), explain **how you verified it works**:
-
-- What did you test?
-- How can a reviewer reproduce/confirm the fix?
-
-### No AI-Generated Walls of Text
-
-Long, AI-generated PR descriptions and issues are not acceptable and may be ignored. Respect the maintainers' time:
-
-- Write short, focused descriptions
-- Explain what changed and why in your own words
-- If you can't explain it briefly, your PR might be too large
-
-### PR Titles
-
-PR titles should follow conventional commit standards:
-
-- `feat:` new feature or functionality
-- `fix:` bug fix
-- `docs:` documentation or README changes
-- `chore:` maintenance tasks, dependency updates, etc.
-- `refactor:` code refactoring without changing behavior
-- `test:` adding or updating tests
-
-You can optionally include a scope to indicate which package is affected:
-
-- `feat(app):` feature in the app package
-- `fix(desktop):` bug fix in the desktop package
-- `chore(opencode):` maintenance in the opencode package
+Use `type(scope): summary`. Supported types are `feat`, `fix`, `docs`, `chore`, `refactor`, and `test`. The scope is optional.
 
 Examples:
 
-- `docs: update contributing guidelines`
-- `fix: resolve crash on startup`
-- `feat: add dark mode support`
-- `feat(app): add dark mode support`
-- `fix(desktop): resolve crash on startup`
-- `chore: bump dependency versions`
+- `docs: update contributing guide`
+- `fix(tui): restore scroll position`
+- `feat(app): add workspace search`
 
-### Style Preferences
+## Issues
 
-These are not strictly enforced, they are just general guidelines:
+Bug reports and feature requests must use their issue templates. Blank issues are not allowed; ask support and how-to questions in the [Discord community](https://discord.gg/opencode).
 
-- **Functions:** Keep logic within a single function unless breaking it out adds clear reuse or composition benefits.
-- **Destructuring:** Do not do unnecessary destructuring of variables.
-- **Control flow:** Avoid `else` statements.
-- **Error handling:** Prefer `.catch(...)` instead of `try`/`catch` when possible.
-- **Types:** Reach for precise types and avoid `any`.
-- **Variables:** Stick to immutable patterns and avoid `let`.
-- **Naming:** Choose concise single-word identifiers when they remain descriptive.
-- **Runtime APIs:** Use Bun helpers such as `Bun.file()` when they fit the use case.
-
-## Feature Requests
-
-For net-new functionality, start with a design conversation. Open an issue describing the problem, your proposed approach (optional), and why it belongs in OpenCode. The core team will help decide whether it should move forward; please wait for that approval instead of opening a feature PR directly.
-
-## Issue Requirements
-
-All issues **must** use one of our issue templates:
-
-- **Bug report** — for reporting bugs (requires a description)
-- **Feature request** — for suggesting enhancements (requires verification checkbox and description)
-- **Question** — for asking questions (requires the question)
-
-Blank issues are not allowed. When a new issue is opened, an automated check verifies that it follows a template and meets our contributing guidelines. If an issue doesn't meet the requirements, you'll receive a comment explaining what needs to be fixed and have **2 hours** to edit the issue. After that, it will be automatically closed.
-
-Issues may be flagged for:
-
-- Not using a template
-- Required fields left empty or filled with placeholder text
-- AI-generated walls of text
-- Missing meaningful content
-
-If you believe your issue was incorrectly flagged, let a maintainer know.
+Automated checks flag missing templates, placeholder text, AI-generated walls of text, and missing meaningful content. You have two hours to correct a flagged issue before it closes automatically. Ask a maintainer if an issue was flagged incorrectly.

docs/design/service-lifecycle.md

@@ -27,8 +27,9 @@ exits before expensive server boot. The design does not require clients to
 agree on a single initiator.
 
 This proposal does not introduce a supervisor process, warm candidate server,
-protocol negotiation, idle background restart, or general execution-recovery
-framework.
+protocol negotiation, idle background restart, or clustered or exactly-once
+execution recovery. Session execution separately provides bounded local recovery
+through durable write-ahead claims.
 
 ## Architecture at a Glance
 
@@ -176,9 +177,9 @@ This design gives each concept one authority.
 - Adding a permanent steward, proxy, or supervisor process.
 - Zero-downtime worker handoff or automatic rollback.
 - Application protocol negotiation or automatic TUI self-restart.
-- General hard-crash recovery for active Sessions.
-- Defining recovery semantics for provider attempts, tools, shells, sub-agents,
-  permissions, questions, or background jobs.
+- Exactly-once recovery for provider attempts, tools, shells, sub-agents,
+  permissions, questions, or background jobs. Top-level Session continuation
+  after process death is handled separately through durable execution claims.
 - Automatically killing a frozen owner.
 - Bounding concurrent location cold boots after clients reconnect.
 - Multi-machine or clustered service placement.
@@ -202,9 +203,10 @@ This design gives each concept one authority.
    diagnosed, non-retryable cause.
 8. **Clients do not kill an unresponsive owner automatically.** Destructive
    recovery requires the explicit `service restart` command.
-9. **Lifecycle does not promise execution semantics.** Graceful replacement
-   invokes Session suspension and resumption hooks, but tool-level continuity
-   belongs to a separate design.
+9. **Lifecycle does not promise exactly-once execution.** A successor invokes
+   the Session execution-claim sweep, which resumes from durable history.
+   Provider-attempt identity and tool-side-effect fencing belong to separate
+   designs.
 
 ## System Model
 
@@ -485,23 +487,20 @@ The UI derives text from status:
 | `ready`                  | Normal TUI                          |
 
 ## Session Continuity
-
+
 Every process-local Session busy period writes a durable execution claim before
-resumption hooks:
-
+its runner starts. Success, failure, and user interruption release the claim;
+shutdown interruption and process death leave it intact. The
+successor sweeps claimed top-level Sessions, durably counts a recovery attempt,
+appends a continuation instruction, and resumes from projected history. The same
+mechanism covers graceful replacement, crash, SIGKILL, and runtime eviction.
+
 Recovery fails stale running tool projections before further model work, but it
-2. The successor schedules those Sessions for continuation.
-3. The runner reloads durable Session history before continuing.
-
-This lifecycle design does not define what an interrupted physical provider
-attempt or tool invocation means. It does not promise that external side effects
-did not occur, replay the exact interrupted tool, preserve an in-memory form, or
-recover process-local background work.
-
-Those concerns require a separate execution-continuity design covering tools,
-shells, sub-agents, permissions, questions, provider attempts, and hard-crash
-recovery.
-
+does not prove whether an interrupted provider request or external operation
+already took effect. It does not replay the exact interrupted tool, preserve an
+in-memory form, recover process-local background work, or guarantee exactly-once
+provider or tool behavior.
+
 ## Unresponsive Owner
 
 An unreachable registration does not prove that the owner is dead. A contender
@@ -531,13 +530,15 @@ Automatic frozen-owner recovery is deferred.
 1. The old service installs vNext but keeps running.
 2. A fresh vNext TUI finds the healthy vOld service and requests graceful stop.
 3. The old service reports `stopping` and exits. Shutdown interruption preserves
-4. Open TUIs enter their indefinite status loops.
+   the execution claims already written by active Sessions.
+4. Open TUIs enter their indefinite status loops.
 5. One or more clients spawn contenders.
 6. One contender acquires the service lock. Losers exit before heavy boot.
 7. The winner binds and registers the lifecycle shell as `starting`.
 8. Clients stop spawning and wait on the observable winner.
 9. The winner initializes the application, sweeps orphaned execution claims,
-10. TUIs rebuild clients, reconcile state, and resume.
+   and reports `ready`.
+10. TUIs rebuild clients, reconcile state, and resume.
 
 ### Server crashes while ready
 
@@ -546,7 +547,9 @@ Automatic frozen-owner recovery is deferred.
 3. Process death has released the service lock.
 4. One contender wins, replaces registration, and starts normally.
 5. Application startup sweeps orphaned top-level execution claims and resumes
-
+   them with bounded attempt accounting. External side effects remain
+   potentially ambiguous.
+
 ### Winner crashes during startup
 
 1. Clients observed `starting` and remain alive.
@@ -650,8 +653,9 @@ was the observed incident cost.
 6. **Codify launch versus reconnect.** Fresh launch enforces installed version;
    reconnect never activates replacement.
 7. **Integrate Session continuity.** Preserve current background-install and
-   fresh-launch activation behavior while invoking Session continuity hooks.
-8. **Harden explicit recovery.** Verify exact process identity during explicit
+   fresh-launch activation behavior while invoking startup execution-claim
+   recovery.
+8. **Harden explicit recovery.** Verify exact process identity during explicit
    `service restart`; never automatically kill an unresponsive owner.
 9. **Run the full multi-process suite.** Include repeated restart cycles and
    assert that no contender or child process remains afterward.
@@ -677,7 +681,8 @@ was the observed incident cost.
 - Idle background update activation with an admission fence.
 - Application protocol compatibility and automatic local TUI re-exec.
 - Stronger execution recovery with provider-attempt identity, tool-side-effect
-- Shell, sub-agent, permission, question, and background-job continuity.
+  idempotency or fencing, and clustered ownership.
+- Shell, sub-agent, permission, question, and background-job continuity.
 - Automatic recovery for a positively identified frozen owner.
 - Cold-boot concurrency limits and interaction-prioritized location loading.
 - A steward or socket-handoff architecture if zero-downtime replacement becomes

package.json

@@ -33,7 +33,6 @@
     "packages": [
       "packages/*",
       "packages/console/*",
-      "packages/lab/*",
       "packages/stats/*",
       "packages/slack"
     ],
@@ -174,7 +173,6 @@
     "@modelcontextprotocol/sdk@1.29.0": "patches/@modelcontextprotocol%2Fsdk@1.29.0.patch",
     "effect@4.0.0-beta.101": "patches/effect@4.0.0-beta.101.patch",
     "@tanstack/virtual-core@3.17.3": "patches/@tanstack%2Fvirtual-core@3.17.3.patch",
-    "@cloudflare/vitest-pool-workers@0.12.6": "patches/@cloudflare%2Fvitest-pool-workers@0.12.6.patch",
     "@ff-labs/fff-bun@0.10.1": "patches/@ff-labs%2Ffff-bun@0.10.1.patch"
   }
 }

packages/ai/AGENTS.md

@@ -80,7 +80,7 @@ Route defaults are request-shaping defaults such as `headers`, `limits`, `genera
 
 The four-axis decomposition is the reason DeepSeek, TogetherAI, Cerebras, Baseten, Fireworks, and DeepInfra all reuse `OpenAIChat.protocol` verbatim — each provider deployment is a 5-15 line `Route.make(...)` call instead of a 300-400 line route clone. Bug fixes in one protocol propagate to every consumer of that protocol in a single commit.
 
-When a provider ships a non-HTTP transport (OpenAI's WebSocket Responses backend, hypothetical bidirectional streaming APIs), the seam is `Transport` — `WebSocketTransport.jsonTransport.with(...)` constructs an IO template whose `prepare` receives the route endpoint/auth at compile time, builds a WebSocket URL and message, and whose `frames` yields decoded text from the socket. Same protocol and endpoint source, different transport.
+When a provider supports multiple physical transports, selection remains execution policy below its semantic route. `OpenResponsesChannel.transport(...)` owns the provider-neutral Responses WebSocket concept: it prepares one final request, executes HTTP by default, strips WebSocket-disallowed fields, and passes a generic channel exchange to a per-call `WebSocketChannelExecutor` when supplied. Provider-specific Responses routes opt in with handshake and connection-age policy. `Route.streamPrepared` owns decoding and acknowledges channel completion only after successful full consumption.
 
 ### URL Construction
 
@@ -106,7 +106,7 @@ const proxied = gateway.model("openai/gpt-4o-mini")
 Keep provider facades small and explicit:
 
 - Use branded `ProviderID.make(...)` and `ModelID.make(...)` where ids are constructed directly.
-- Use `model` for the default API path and named methods for provider-native alternatives such as OpenAI `responses`, `responsesWebSocket`, and `chat`.
+- Use `model` for the default API path and named methods for provider-native alternatives such as OpenAI `responses` and `chat`.
 - Put provider-specific setup on `.configure(...)`; do not add `model(id, overrides)` as a duplicate construction path.
 - Export lower-level `routes` arrays separately only when advanced internal wiring needs them.
 - Prefer `apiKey` as provider-specific sugar and `auth` as the explicit override; keep them mutually exclusive in provider option types with `ProviderAuthOption`.
@@ -124,11 +124,10 @@ import { model } from "@opencode-ai/ai/providers/openai/responses"
 
 const selected = model("gpt-5", {
   apiKey,
-  transport: "websocket",
 })
 ```
 
-Keep semantic APIs as separate entrypoints, such as OpenAI `chat` and `responses`. Keep transport choices inside the semantic entrypoint settings, so OpenAI Responses HTTP and WebSocket share one entrypoint. Provider facades may still expose named selectors such as `responsesWebSocket` for direct typed call sites; the package-like contract maps its settings to those selectors before returning an executable `LanguageModel`.
+Keep semantic APIs as separate entrypoints, such as OpenAI `chat` and `responses`. Transport is execution policy: OpenAI Responses uses HTTP by default and may receive a per-call WebSocket channel executor through `StreamOptions` without changing model or route identity.
 
 Do not expose `Route` in provider package settings. Route composition stays an implementation detail behind `model(...)`.
 
@@ -154,14 +153,16 @@ packages/ai/src/
     auth-options.ts         ProviderAuthOption shape, AuthOptions.bearer, AtLeastOne helper
     framing.ts              Framing type + Framing.sse
     transport/              transport implementations
-      index.ts              Transport type + HttpTransport / WebSocketTransport namespaces
+      index.ts              Transport execution types + HttpTransport / WebSocketTransport namespaces
+      websocket-channel.ts  generic sequential channel executor/driver contract
       http.ts               HttpTransport.httpJson — POST + framing
-      websocket.ts          WebSocketTransport.json + WebSocketExecutor service
+      websocket.ts          direct one-request channel executor + raw socket adapter
   protocols/
     shared.ts               ProviderShared toolkit used inside protocol impls
     openai-chat.ts          protocol + route (compose OpenAIChat.protocol)
     open-responses.ts         provider-neutral Responses protocol baseline
-    openai-responses.ts       OpenAI tools/events/transports composed over OpenResponses
+    open-responses-channel.ts provider-neutral Responses WebSocket transport factory
+    openai-responses.ts       OpenAI tools/events and channel policy composed over OpenResponses
     anthropic-messages.ts
     gemini.ts
     bedrock-converse.ts

packages/ai/README.md

@@ -315,7 +315,6 @@ import { model } from "@opencode-ai/ai/providers/openai/responses"
 
 const selected = model("gpt-5", {
   apiKey: process.env.OPENAI_API_KEY,
-  transport: "websocket",
   headers: { "x-application": "opencode" },
   limits: { context: 200_000, output: 64_000 },
 })
@@ -332,7 +331,7 @@ OpenAI Chat and OpenAI Responses are separate semantic entrypoints:
 - `@opencode-ai/ai/providers/google-vertex/responses`
 - `@opencode-ai/ai/providers/google-vertex/messages`
 
-Responses HTTP versus WebSocket is a scoped `transport` setting on the OpenAI Responses entrypoint, not another entrypoint. Azure follows the same Chat/Responses split at `providers/azure/chat` and `providers/azure/responses`. Generic OpenAI-compatible Chat remains at `providers/openai-compatible`; the Responses adapter at `providers/openai-compatible/responses` uses the provider-neutral Open Responses protocol. OpenAI Responses extends that baseline with OpenAI tools, event variants, metadata, defaults, and transports. Generic Anthropic Messages-compatible providers use `providers/anthropic-compatible`, which the named Anthropic provider composes. Google Gemini and Amazon Bedrock expose their single native API through their existing provider paths.
+OpenAI Responses has one semantic route and uses HTTP by default. Advanced callers may supply a per-call WebSocket channel executor through `StreamOptions`; transport policy does not change provider settings, model identity, or route identity. The provider-neutral Open Responses implementation owns the reusable WebSocket request and event contract, while each provider opts in with its own handshake and connection policy. Azure follows the same Chat/Responses split at `providers/azure/chat` and `providers/azure/responses`. Generic OpenAI-compatible Chat remains at `providers/openai-compatible`; the Responses adapter at `providers/openai-compatible/responses` uses the provider-neutral Open Responses protocol. OpenAI Responses extends that baseline with OpenAI tools, event variants, metadata, and defaults. Generic Anthropic Messages-compatible providers use `providers/anthropic-compatible`, which the named Anthropic provider composes. Google Gemini and Amazon Bedrock expose their single native API through their existing provider paths.
 
 Vertex Gemini, Vertex Chat, Vertex Responses, and Vertex Messages are separate API entrypoints. All accept `project`, `location`, and an optional `accessToken`; when no explicit token or auth override is supplied they lazily use Google Application Default Credentials. Vertex Gemini instead selects express mode when `apiKey` or `GOOGLE_VERTEX_API_KEY` is present. Vertex Chat targets MaaS models through the OpenAI-compatible Chat Completions endpoint, while Vertex Responses targets Grok models and defaults `store` to `false` as required by Vertex. `providers/google-vertex` remains the default alias for `providers/google-vertex/gemini`.
 

packages/ai/STATUS.md

@@ -1,6 +1,6 @@
 # LLM Provider Parity Status
 
-Last reviewed: 2026-07-24
+Last reviewed: 2026-08-07
 
 This file tracks the gap between the native `@opencode-ai/ai` package and the AI SDK provider packages that opencode still depends on for many catalog/runtime paths.
 
@@ -16,8 +16,7 @@ This file tracks the gap between the native `@opencode-ai/ai` package and the AI
 | Native slice                       | Source                                                                                                                            | Current state                                                                                                                                                            | Main gaps                                                                                                                                                                                                                                                 |
 | ---------------------------------- | --------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | OpenAI Chat                        | `src/protocols/openai-chat.ts`, `src/providers/openai.ts`                                                                         | Usable. Streams text, reasoning deltas, tool calls, usage, images, and common generation controls.                                                                       | No typed structured-output / `response_format` path. Limited typed OpenAI option surface compared with SDK escape hatches.                                                                                                                                |
-| OpenAI Responses HTTP              | `src/protocols/open-responses.ts`, `src/protocols/openai-responses.ts`, `src/providers/openai.ts`                                 | Usable. Extends the Open Responses baseline with hosted-tool event surfacing, reasoning replay metadata, GPT-5 defaults, and cache usage.                                | No explicit `previous_response_id` path. Typed options cover only a subset of Responses fields. Structured output is still mostly synthetic-tool based.                                                                                                   |
-| OpenAI Responses WebSocket         | `src/protocols/openai-responses.ts`, `src/route/transport/websocket.ts`                                                           | Present as `OpenAI.responsesWebSocket(...)`.                                                                                                                             | Runner/catalog support explicitly must not downgrade WebSocket routes; broader runtime selection is not complete.                                                                                                                                         |
+| OpenAI Responses                   | `src/protocols/open-responses.ts`, `src/protocols/openai-responses.ts`, `src/providers/openai.ts`                                 | Usable over HTTP by default, with optional per-call WebSocket channel execution on the same model and route identity.                                                    | No incremental `previous_response_id` path or persistent Session channel manager yet. Typed options cover only a subset of Responses fields. Structured output is still mostly synthetic-tool based.                                                      |
 | OpenAI-compatible Chat             | `src/protocols/openai-compatible-chat.ts`, `src/providers/openai-compatible.ts`                                                   | Usable for generic Chat and several profiles: Baseten, Cerebras, DeepInfra, DeepSeek, Fireworks, Groq, TogetherAI.                                                       | Family quirks are mostly endpoint defaults, not full typed behavior.                                                                                                                                                                                      |
 | Open Responses-compatible          | `src/protocols/open-responses.ts`, `src/protocols/openai-compatible-responses.ts`, `src/providers/openai-compatible-responses.ts` | Usable for deployments that implement the provider-neutral Open Responses protocol. The deployment adapter does not inherit OpenAI tools, events, metadata, or defaults. | No named family profiles or recorded deployment coverage yet.                                                                                                                                                                                             |
 | Anthropic-compatible Messages      | `src/protocols/anthropic-messages.ts`, `src/providers/anthropic-compatible.ts`                                                    | Usable for deployments that implement the Anthropic Messages wire protocol. Named Anthropic composes this base; MiniMax M3 has recorded text and tool-loop coverage.     | No named compatible family profiles yet.                                                                                                                                                                                                                  |
@@ -48,19 +47,19 @@ Other `aisdk:` packages, including Google Vertex, Azure, and Bedrock, currently
 
 ## AI SDK Package Parity Matrix
 
-| AI SDK package                    | Intended native target                                         | Status           | Biggest gaps                                                                                                                                                                                                        |
-| --------------------------------- | -------------------------------------------------------------- | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `@ai-sdk/openai`                  | `OpenAI.chat`, `OpenAI.responses`, `OpenAI.responsesWebSocket` | Partial / usable | Add complete typed option coverage, structured output strategy, explicit Responses continuation support, and runner route selection between Chat/Responses/WebSocket.                                               |
-| `@ai-sdk/openai-compatible`       | Generic OpenAI-compatible Chat and Responses                   | Partial / usable | Decide per-family namespace/profile behavior and runner API selection for providers that support Responses versus Chat only.                                                                                        |
-| `@ai-sdk/anthropic`               | `AnthropicMessages`                                            | Partial / usable | Finish Messages API parity for headers/betas/metadata/newer fields and document hosted-tool continuation expectations.                                                                                              |
-| `@ai-sdk/google`                  | Gemini Developer API                                           | Partial / usable | Add typed options for safety, response schema/modalities, cached content, grounding/search/code execution, and non-text output modes where supported.                                                               |
-| `@ai-sdk/google-vertex`           | Vertex Gemini namespace/facade                                 | Partial / usable | Add runner/catalog mapping, recorded coverage, and broader provider-option parity.                                                                                                                                  |
-| `@ai-sdk/google-vertex/anthropic` | Anthropic Messages over Vertex namespace/facade                | Partial / usable | Add runner/catalog mapping, recorded coverage, and Vertex-specific hosted-tool parity.                                                                                                                              |
-| `@ai-sdk/google-vertex/maas`      | Vertex Chat                                                    | Partial / usable | Add runner/catalog mapping, recorded coverage, and MaaS family-specific request parity.                                                                                                                             |
-| `@ai-sdk/google-vertex/xai`       | Vertex Chat / Responses                                        | Partial / usable | Decide Chat/Responses selection for catalog models, add runner mapping and recorded coverage, and review xAI-specific request options.                                                                              |
-| `@ai-sdk/azure`                   | Azure OpenAI Chat/Responses facade                             | Partial          | Map runner/catalog metadata to native Azure, handle resourceName/baseURL/apiVersion variants, add AAD/token auth story, and verify Chat vs Responses deployment selection.                                          |
-| `@ai-sdk/amazon-bedrock`          | Bedrock Converse                                               | Partial          | Add default AWS credential chain/profile support, region/inference-profile model ID handling, provider option parity via `additionalModelRequestFields`, guardrails/performance config, and runner/catalog mapping. |
-| `@ai-sdk/amazon-bedrock/mantle`   | Bedrock Mantle OpenAI-compatible Chat/Responses namespace      | Partial / usable | Add default AWS credential chain/profile support; native catalog mapping currently requires bearer auth or explicit static credentials.                                                                             |
+| AI SDK package                    | Intended native target                                    | Status           | Biggest gaps                                                                                                                                                                                                        |
+| --------------------------------- | --------------------------------------------------------- | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `@ai-sdk/openai`                  | `OpenAI.chat`, `OpenAI.responses`                         | Partial / usable | Add complete typed option coverage, structured output strategy, explicit Responses continuation support, and runner execution policy for optional WebSocket channels.                                               |
+| `@ai-sdk/openai-compatible`       | Generic OpenAI-compatible Chat and Responses              | Partial / usable | Decide per-family namespace/profile behavior and runner API selection for providers that support Responses versus Chat only.                                                                                        |
+| `@ai-sdk/anthropic`               | `AnthropicMessages`                                       | Partial / usable | Finish Messages API parity for headers/betas/metadata/newer fields and document hosted-tool continuation expectations.                                                                                              |
+| `@ai-sdk/google`                  | Gemini Developer API                                      | Partial / usable | Add typed options for safety, response schema/modalities, cached content, grounding/search/code execution, and non-text output modes where supported.                                                               |
+| `@ai-sdk/google-vertex`           | Vertex Gemini namespace/facade                            | Partial / usable | Add runner/catalog mapping, recorded coverage, and broader provider-option parity.                                                                                                                                  |
+| `@ai-sdk/google-vertex/anthropic` | Anthropic Messages over Vertex namespace/facade           | Partial / usable | Add runner/catalog mapping, recorded coverage, and Vertex-specific hosted-tool parity.                                                                                                                              |
+| `@ai-sdk/google-vertex/maas`      | Vertex Chat                                               | Partial / usable | Add runner/catalog mapping, recorded coverage, and MaaS family-specific request parity.                                                                                                                             |
+| `@ai-sdk/google-vertex/xai`       | Vertex Chat / Responses                                   | Partial / usable | Decide Chat/Responses selection for catalog models, add runner mapping and recorded coverage, and review xAI-specific request options.                                                                              |
+| `@ai-sdk/azure`                   | Azure OpenAI Chat/Responses facade                        | Partial          | Map runner/catalog metadata to native Azure, handle resourceName/baseURL/apiVersion variants, add AAD/token auth story, and verify Chat vs Responses deployment selection.                                          |
+| `@ai-sdk/amazon-bedrock`          | Bedrock Converse                                          | Partial          | Add default AWS credential chain/profile support, region/inference-profile model ID handling, provider option parity via `additionalModelRequestFields`, guardrails/performance config, and runner/catalog mapping. |
+| `@ai-sdk/amazon-bedrock/mantle`   | Bedrock Mantle OpenAI-compatible Chat/Responses namespace | Partial / usable | Add default AWS credential chain/profile support; native catalog mapping currently requires bearer auth or explicit static credentials.                                                                             |
 
 ## Highest-Risk Gaps
 
@@ -78,24 +77,24 @@ Other `aisdk:` packages, including Google Vertex, Azure, and Bedrock, currently
 
 These are implementation/API slices, not separate npm packages.
 
-| API slice                     | Package-like entrypoint                                     | Purpose                                                                      |
-| ----------------------------- | ----------------------------------------------------------- | ---------------------------------------------------------------------------- |
-| OpenAI Chat                   | `@opencode-ai/ai/providers/openai/chat`                     | OpenAI `/chat/completions` semantics.                                        |
-| OpenAI Responses              | `@opencode-ai/ai/providers/openai/responses`                | OpenAI `/responses` semantics with HTTP/WebSocket selected through settings. |
-| OpenAI-compatible Chat        | `@opencode-ai/ai/providers/openai-compatible`               | Generic OpenAI-compatible `/chat/completions`.                               |
-| Open Responses-compatible     | `@opencode-ai/ai/providers/openai-compatible/responses`     | Generic provider-neutral `/responses`.                                       |
-| Anthropic-compatible Messages | `@opencode-ai/ai/providers/anthropic-compatible`            | Generic Anthropic-compatible `/messages`.                                    |
-| Anthropic Messages            | `@opencode-ai/ai/providers/anthropic`                       | Anthropic Messages API.                                                      |
-| Gemini Developer API          | `@opencode-ai/ai/providers/google`                          | Google AI Studio Gemini API.                                                 |
-| Vertex Gemini                 | `@opencode-ai/ai/providers/google-vertex/gemini`            | Vertex Gemini API; `providers/google-vertex` is the default alias.           |
-| Vertex Chat                   | `@opencode-ai/ai/providers/google-vertex/chat`              | Vertex OpenAI-compatible Chat Completions for MaaS models.                   |
-| Vertex Responses              | `@opencode-ai/ai/providers/google-vertex/responses`         | Vertex Open Responses for Grok models.                                       |
-| Vertex Messages               | `@opencode-ai/ai/providers/google-vertex/messages`          | Vertex-hosted Anthropic Messages API.                                        |
-| Bedrock Converse              | `@opencode-ai/ai/providers/amazon-bedrock`                  | AWS Bedrock Converse API.                                                    |
-| Bedrock Mantle Chat           | `@opencode-ai/ai/providers/amazon-bedrock/mantle/chat`      | AWS Bedrock Mantle OpenAI-compatible Chat API.                               |
-| Bedrock Mantle Responses      | `@opencode-ai/ai/providers/amazon-bedrock/mantle/responses` | AWS Bedrock Mantle OpenAI-compatible Responses API.                          |
-| Azure OpenAI Chat             | `@opencode-ai/ai/providers/azure/chat`                      | Azure specialization of OpenAI Chat.                                         |
-| Azure OpenAI Responses        | `@opencode-ai/ai/providers/azure/responses`                 | Azure specialization of OpenAI Responses.                                    |
+| API slice                     | Package-like entrypoint                                     | Purpose                                                                                    |
+| ----------------------------- | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
+| OpenAI Chat                   | `@opencode-ai/ai/providers/openai/chat`                     | OpenAI `/chat/completions` semantics.                                                      |
+| OpenAI Responses              | `@opencode-ai/ai/providers/openai/responses`                | OpenAI `/responses` semantics with HTTP default and optional per-call WebSocket execution. |
+| OpenAI-compatible Chat        | `@opencode-ai/ai/providers/openai-compatible`               | Generic OpenAI-compatible `/chat/completions`.                                             |
+| Open Responses-compatible     | `@opencode-ai/ai/providers/openai-compatible/responses`     | Generic provider-neutral `/responses`.                                                     |
+| Anthropic-compatible Messages | `@opencode-ai/ai/providers/anthropic-compatible`            | Generic Anthropic-compatible `/messages`.                                                  |
+| Anthropic Messages            | `@opencode-ai/ai/providers/anthropic`                       | Anthropic Messages API.                                                                    |
+| Gemini Developer API          | `@opencode-ai/ai/providers/google`                          | Google AI Studio Gemini API.                                                               |
+| Vertex Gemini                 | `@opencode-ai/ai/providers/google-vertex/gemini`            | Vertex Gemini API; `providers/google-vertex` is the default alias.                         |
+| Vertex Chat                   | `@opencode-ai/ai/providers/google-vertex/chat`              | Vertex OpenAI-compatible Chat Completions for MaaS models.                                 |
+| Vertex Responses              | `@opencode-ai/ai/providers/google-vertex/responses`         | Vertex Open Responses for Grok models.                                                     |
+| Vertex Messages               | `@opencode-ai/ai/providers/google-vertex/messages`          | Vertex-hosted Anthropic Messages API.                                                      |
+| Bedrock Converse              | `@opencode-ai/ai/providers/amazon-bedrock`                  | AWS Bedrock Converse API.                                                                  |
+| Bedrock Mantle Chat           | `@opencode-ai/ai/providers/amazon-bedrock/mantle/chat`      | AWS Bedrock Mantle OpenAI-compatible Chat API.                                             |
+| Bedrock Mantle Responses      | `@opencode-ai/ai/providers/amazon-bedrock/mantle/responses` | AWS Bedrock Mantle OpenAI-compatible Responses API.                                        |
+| Azure OpenAI Chat             | `@opencode-ai/ai/providers/azure/chat`                      | Azure specialization of OpenAI Chat.                                                       |
+| Azure OpenAI Responses        | `@opencode-ai/ai/providers/azure/responses`                 | Azure specialization of OpenAI Responses.                                                  |
 
 ## Suggested Next Work Slices
 

packages/ai/example/call-sites.md

@@ -67,7 +67,6 @@ Examples:
 ```ts
 OpenAI.responses("gpt-4o")
 OpenAI.chat("gpt-4o")
-OpenAI.responsesWebSocket("gpt-4o")
 
 Azure.configure({ resourceName, apiKey }).responses("my-deployment")
 AmazonBedrock.configure({ region, credentials }).model("anthropic.claude-3-5-sonnet-20241022-v2:0")
@@ -250,11 +249,6 @@ const openAIChat = Route.make({
   auth: Auth.envBearer("OPENAI_API_KEY"),
 })
 
-const openAIResponsesWebSocket = openAIResponses.with({
-  id: "openai-responses-websocket",
-  transport: WebSocketTransport.json,
-})
-
 const openAIConfig = (input: OpenAIConfig) => ({
   endpoint: input.endpoint,
   auth: input.auth ?? (input.apiKey ? Auth.bearer(input.apiKey) : undefined),
@@ -266,13 +260,11 @@ const openAIConfig = (input: OpenAIConfig) => ({
 
 const configureOpenAI = (input: OpenAIConfig = {}) => {
   const responses = openAIResponses.with(openAIConfig(input))
-  const responsesWebSocket = openAIResponsesWebSocket.with(openAIConfig(input))
   const chat = openAIChat.with(openAIConfig(input))
 
   return {
     id: openAIProvider,
     responses: responses.model,
-    responsesWebSocket: responsesWebSocket.model,
     chat: chat.model,
     model: responses.model,
     configure: configureOpenAI,
@@ -342,22 +334,19 @@ const response =
   )
 ```
 
-For direct provider-facade calls, HTTP versus WebSocket is represented as named
-route selectors, not as model or request overrides. Same protocol, different
-transport, different route:
+For direct provider-facade calls, Responses has one semantic model and route:
 
 ```ts
 OpenAI.responses("gpt-4o")
-OpenAI.responsesWebSocket("gpt-4o")
 ```
 
-The package-like OpenAI Responses entrypoint instead keeps transport scoped to
-Responses settings while preserving the same `model(...)` contract:
+The package-like OpenAI Responses entrypoint has the same transport-neutral
+`model(...)` contract:
 
 ```ts
 import { model } from "@opencode-ai/ai/providers/openai/responses"
 
-model("gpt-4o", { apiKey, transport: "websocket" })
+model("gpt-4o", { apiKey })
 ```
 
 Vertex keeps Gemini, Chat, Responses, and Messages as separate package-like entrypoints,
@@ -387,11 +376,9 @@ import { model } from "@opencode-ai/ai/providers/google-vertex/messages"
 model("claude-sonnet-4-6", { project, location: "global" })
 ```
 
-The client should not require a different public layer just because a selected
-route uses WebSocket. Use one `LLMClient.layer` with HTTP and WebSocket runtime
-capabilities available; routes that do not need WebSocket simply never touch it.
-If a WebSocket route is selected in an environment without WebSocket support,
-fail with a typed transport configuration error.
+The client does not require a different public layer for WebSocket execution.
+Responses routes use HTTP by default, and callers may pass a channel executor per
+call. Routes without channel support simply ignore that execution capability.
 
 Azure is a route specialization with auth/path/default changes plus input
 mapping. The public API configures the Azure resource once, then selects
@@ -497,18 +484,13 @@ generic dynamic resolver:
 
 ```ts
 const model =
-  providerID === "azure"
-    ? Azure.configure(resolvedAzureConfig).responses(apiModelID)
-    : endpoint.websocket
-      ? OpenAI.responsesWebSocket(apiModelID)
-      : OpenAI.responses(apiModelID)
+  providerID === "azure" ? Azure.configure(resolvedAzureConfig).responses(apiModelID) : OpenAI.responses(apiModelID)
 ```
 
 That boundary can branch on durable config/catalog metadata and call typed
-provider APIs directly. A direct provider-facade boundary maps metadata like
-`endpoint.websocket` to `OpenAI.responsesWebSocket(apiModelID)`. A package-loading
-boundary passes `transport: "websocket"` to the OpenAI Responses entrypoint.
-The client runtime only executes the route carried by the resulting model.
+provider APIs directly. Transport selection remains execution policy: a Session
+or other caller may pass a WebSocket channel executor per call without changing
+the model constructed by this boundary.
 
 ## Competitive Shape
 
@@ -544,9 +526,8 @@ App boundary = explicit durable-config -> typed-provider call
   id.
 - No `model(id, overrides)` escape hatch. Model selection takes the model id;
   endpoint/auth/deployment customization happens by configuring the route first.
-- No transport override on an executable model or request. Direct provider
-  facades use `responses` versus `responsesWebSocket`; the package-like Responses
-  entrypoint maps its scoped `transport` setting before constructing the model.
+- No transport setting on a provider or executable model. OpenAI Responses uses
+  HTTP by default and accepts an optional per-call channel executor as execution policy.
 - No separate public `LLMClient.layerWithWebSocket`. The runtime should expose one
   client layer with the available transport capabilities.
 - No executable `ModelRef`. The executable handle is `LanguageModel`; durable model
@@ -580,12 +561,10 @@ App boundary = explicit durable-config -> typed-provider call
 - [x] Make unconfigured transports reusable constants such as
       `HttpTransport.sseJson`; keep transport functions only for configured/fresh
       state construction.
-- [x] Collapse the public WebSocket runtime split so one `LLMClient.layer`
-      exposes available transport capabilities and selected routes fail with typed
-      transport config errors when a required capability is missing.
+- [x] Collapse the public WebSocket runtime split so one `LLMClient.layer` accepts
+      optional per-call channel execution without changing route identity.
 - [x] Convert OpenAI provider APIs to provider-facade shape:
-      `OpenAI.configure(config).responses(id)`, `.chat(id)`, and
-      `.responsesWebSocket(id)`.
+      `OpenAI.configure(config).responses(id)` and `.chat(id)`.
 - [x] Convert Azure to a configured facade where resource/base URL/api version
       setup happens before selecting deployment ids.
 - [x] Split Cloudflare products into separate facades such as
@@ -599,10 +578,8 @@ App boundary = explicit durable-config -> typed-provider call
 - [ ] Decide whether a tiny `Provider.define(...)` helper is warranted after two
       or three provider conversions; start with plain objects if duplication is not
       yet painful.
-- [x] Update `packages/opencode/src/session/llm/native-request.ts` to construct
-      executable models at the session boundary with explicit provider facade
-      calls, mapping catalog metadata such as `endpoint.websocket` to the correct
-      named route selector.
+- [x] Keep executable model construction transport-neutral at the Session boundary;
+      Session-scoped execution policy supplies channel capability separately.
 - [ ] Update tests so direct route/provider tests assert route values are carried
       by executable models, and opencode/native tests assert boundary-based route
       selection.

packages/ai/example/tutorial.ts

@@ -1,6 +1,6 @@
 import { Config, Effect, Formatter, Layer, Schema, Stream } from "effect"
 import { LLM, LLMClient, LLMRequest, Message, ProviderID, Tool, ToolRuntime } from "@opencode-ai/ai"
-import { Route, Auth, Endpoint, Framing, Protocol, RequestExecutor, WebSocketExecutor } from "@opencode-ai/ai/route"
+import { Route, Auth, Endpoint, Framing, Protocol, RequestExecutor } from "@opencode-ai/ai/route"
 import { OpenAI } from "@opencode-ai/ai/providers"
 
 /**
@@ -213,8 +213,7 @@ const FakeEcho = {
 // enabled at a time so the tutorial can demonstrate generate, stream, or
 // tool-loop behavior without spending tokens on every example.
 const requestExecutorLayer = RequestExecutor.fetchLayer
-const llmDeps = Layer.mergeAll(requestExecutorLayer, WebSocketExecutor.layer)
-const llmClientLayer = LLMClient.layer.pipe(Layer.provide(llmDeps))
+const llmClientLayer = LLMClient.layer.pipe(Layer.provide(requestExecutorLayer))
 
 const program = Effect.gen(function* () {
   // yield* generateOnce
@@ -222,6 +221,6 @@ const program = Effect.gen(function* () {
   // yield* generateStructuredObject
   // yield* generateDynamicObject.pipe(Effect.andThen((response) => Effect.sync(() => console.log(response.object))))
   yield* streamWithTools
-}).pipe(Effect.provide(Layer.mergeAll(llmDeps, llmClientLayer)))
+}).pipe(Effect.provide(Layer.mergeAll(requestExecutorLayer, llmClientLayer)))
 
 Effect.runPromise(program)

packages/ai/src/protocols/index.ts

@@ -7,3 +7,4 @@ export * as OpenAICompatibleChat from "./openai-compatible-chat.js"
 export * as OpenAICompatibleResponses from "./openai-compatible-responses.js"
 export * as OpenAIResponses from "./openai-responses.js"
 export * as OpenResponses from "./open-responses.js"
+export * as OpenResponsesChannel from "./open-responses-channel.js"

packages/ai/src/protocols/open-responses-channel.ts

@@ -0,0 +1,191 @@
+import { Effect, Schema, Stream } from "effect"
+import { Headers } from "effect/unstable/http"
+import { Framing } from "../route/framing.js"
+import {
+  HttpTransport,
+  WebSocketTransport,
+  type Transport,
+  type WebSocketChannelDriver,
+  type WebSocketChannelExchange,
+} from "../route/transport/index.js"
+import * as ProviderShared from "./shared.js"
+import { OpenResponses } from "./open-responses.js"
+
+const WebSocketResponseCreate = Schema.StructWithRest(Schema.Struct({ type: Schema.tag("response.create") }), [
+  Schema.Record(Schema.String, Schema.Unknown),
+])
+const decodeMessage = ProviderShared.validateWith(Schema.decodeUnknownEffect(WebSocketResponseCreate))
+const encodeMessage = Schema.encodeSync(Schema.fromJsonString(WebSocketResponseCreate))
+const decodeEvent = Schema.decodeUnknownEffect(OpenResponses.protocol.stream.event)
+
+export interface Options {
+  readonly id: string
+  readonly name: string
+  readonly rotateAfterMs?: number
+  readonly headers?: (headers: Headers.Headers) => Headers.Headers
+  readonly driver?: (input: {
+    readonly request: Readonly<Record<string, unknown>>
+    readonly message: string
+    readonly base: WebSocketChannelDriver
+  }) => WebSocketChannelDriver
+}
+
+export interface Prepared {
+  readonly http: HttpTransport.HttpPrepared<string>
+  readonly channel?: {
+    readonly url: string
+    readonly headers: Headers.Headers
+    readonly rotateAfterMs?: number
+    readonly driver: WebSocketChannelDriver
+  }
+}
+
+const message = (body: unknown) =>
+  Effect.gen(function* () {
+    if (!ProviderShared.isRecord(body))
+      return yield* ProviderShared.invalidRequest("Open Responses WebSocket body must be a JSON object")
+    const { stream: _stream, stream_options: _streamOptions, background: _background, ...request } = body
+    const decoded = yield* decodeMessage({ ...request, type: "response.create" })
+    return { request: decoded, message: encodeMessage(decoded) }
+  })
+
+const driver = (options: Options, body: string): WebSocketChannelDriver => {
+  let responseID: string | undefined
+  let terminal = false
+  return {
+    create: () =>
+      Effect.sync(() => {
+        responseID = undefined
+        terminal = false
+        return { message: body, mode: "full" }
+      }),
+    observe: (_create, frame) =>
+      Effect.gen(function* () {
+        const event = yield* decodeEvent(frame).pipe(
+          Effect.mapError(() =>
+            ProviderShared.eventError(options.id, `Invalid ${options.name} WebSocket event`, frame),
+          ),
+        )
+        if (terminal)
+          return yield* ProviderShared.eventError(
+            options.id,
+            `${options.name} emitted ${event.type} after a terminal event`,
+            frame,
+          )
+        if (event.type === "error") {
+          terminal = true
+          yield* OpenResponses.decodeKnownErrorEvent(event).pipe(
+            Effect.mapError(() =>
+              ProviderShared.eventError(options.id, `${options.name} returned a malformed error event`, frame),
+            ),
+          )
+          return {
+            type: "provider-failure",
+            error: OpenResponses.providerFailure(options.id, event, `${options.name} stream error`),
+          }
+        }
+        if (event.type === "response.failed") {
+          terminal = true
+          if (responseID && event.response?.id && event.response.id !== responseID)
+            return yield* ProviderShared.eventError(
+              options.id,
+              `${options.name} response ID changed during execution`,
+              frame,
+            )
+          return {
+            type: "provider-failure",
+            error: OpenResponses.providerFailure(options.id, event, `${options.name} response failed`),
+          }
+        }
+        if (event.type === "response.created") {
+          const created = event.response?.id
+          if (responseID)
+            return yield* ProviderShared.eventError(
+              options.id,
+              `${options.name} emitted duplicate response.created`,
+              frame,
+            )
+          if (!created)
+            return yield* ProviderShared.eventError(
+              options.id,
+              `${options.name} response.created is missing response.id`,
+              frame,
+            )
+          responseID = created
+          return { type: "frame", frame }
+        }
+        if (!responseID)
+          return yield* ProviderShared.eventError(
+            options.id,
+            `${options.name} emitted ${event.type} before response.created`,
+            frame,
+          )
+        if (event.response?.id && event.response.id !== responseID)
+          return yield* ProviderShared.eventError(
+            options.id,
+            `${options.name} response ID changed during execution`,
+            frame,
+          )
+        if (event.type === "response.completed") {
+          terminal = true
+          return { type: "completed", frame }
+        }
+        if (event.type === "response.incomplete") {
+          terminal = true
+          return { type: "incomplete", frame }
+        }
+        return { type: "frame", frame }
+      }),
+  }
+}
+
+export const transport = <Body>(options: Options): Transport<Body, Prepared, string> => {
+  const http = HttpTransport.sseJson.with<Body>()
+  return {
+    id: http.id,
+    prepare: (input) =>
+      Effect.gen(function* () {
+        const parts = yield* HttpTransport.jsonRequestParts(input)
+        const headers = Headers.remove(options.headers?.(parts.headers) ?? parts.headers, "content-length")
+        const channel = input.webSocket
+          ? yield* Effect.gen(function* () {
+              const create = yield* message(parts.jsonBody)
+              const base = driver(options, create.message)
+              return {
+                url: yield* WebSocketTransport.toWebSocketUrl(parts.url),
+                headers,
+                rotateAfterMs: options.rotateAfterMs,
+                driver: options.driver?.({ request: create.request, message: create.message, base }) ?? base,
+              }
+            })
+          : undefined
+        return {
+          http: {
+            request: ProviderShared.jsonPost({ url: parts.url, body: parts.bodyText, headers: parts.headers }),
+            framing: Framing.sse,
+            middleware: input.middleware,
+          },
+          channel,
+        }
+      }),
+    execute: (prepared, request, runtime, executeOptions) => {
+      if (!executeOptions?.webSocket || !prepared.channel) return http.execute(prepared.http, request, runtime)
+      const exchange: WebSocketChannelExchange = {
+        id: request.id ?? "request",
+        connect: {
+          url: prepared.channel.url,
+          headers: prepared.channel.headers,
+          rotateAfterMs: prepared.channel.rotateAfterMs,
+        },
+        fallback: () =>
+          Stream.unwrap(
+            http.execute(prepared.http, request, runtime).pipe(Effect.map((execution) => execution.frames)),
+          ),
+        driver: prepared.channel.driver,
+      }
+      return executeOptions.webSocket.execute(exchange)
+    },
+  }
+}
+
+export const OpenResponsesChannel = { transport } as const

packages/ai/src/protocols/open-responses.ts

@@ -211,11 +211,43 @@ export type StreamItem = Schema.Schema.Type<typeof StreamItem>
 // event-level `error` envelope, so accept all three shapes here.
 // https://www.openresponses.org/specification
 const OpenResponsesErrorPayload = Schema.Struct({
+  type: optionalNull(Schema.String),
   code: optionalNull(Schema.String),
   message: optionalNull(Schema.String),
   param: optionalNull(Schema.String),
 })
 
+const WebSocketErrorHeader = Schema.Union([Schema.String, Schema.Number, Schema.Boolean])
+export const WebSocketErrorEvent = Schema.StructWithRest(
+  Schema.Struct({
+    type: Schema.tag("error"),
+    status: Schema.optional(Schema.Number),
+    status_code: Schema.optional(Schema.Number),
+    code: optionalNull(Schema.String),
+    message: Schema.optional(Schema.String),
+    param: optionalNull(Schema.String),
+    error: optionalNull(OpenResponsesErrorPayload),
+    headers: Schema.optional(Schema.Record(Schema.String, WebSocketErrorHeader)),
+  }),
+  [Schema.Record(Schema.String, Schema.Unknown)],
+)
+const decodeWebSocketErrorEvent = Schema.decodeUnknownEffect(WebSocketErrorEvent)
+
+export const decodeKnownErrorEvent = (event: Event) =>
+  decodeWebSocketErrorEvent({
+    ...event,
+    status: typeof event.status === "number" ? event.status : undefined,
+    status_code: typeof event.status_code === "number" ? event.status_code : undefined,
+    headers: ProviderShared.isRecord(event.headers)
+      ? Object.fromEntries(
+          Object.entries(event.headers).filter(
+            (entry): entry is [string, string | number | boolean] =>
+              typeof entry[1] === "string" || typeof entry[1] === "number" || typeof entry[1] === "boolean",
+          ),
+        )
+      : undefined,
+  })
+
 export const Event = Schema.StructWithRest(
   Schema.Struct({
     type: Schema.String,
@@ -240,6 +272,9 @@ export const Event = Schema.StructWithRest(
     message: Schema.optional(Schema.String),
     param: optionalNull(Schema.String),
     error: optionalNull(OpenResponsesErrorPayload),
+    status: Schema.optional(Schema.Unknown),
+    status_code: Schema.optional(Schema.Unknown),
+    headers: Schema.optional(Schema.Unknown),
   }),
   [Schema.Record(Schema.String, Schema.Unknown)],
 )
@@ -632,9 +667,9 @@ export type StepResult = readonly [ParserState, ReadonlyArray<LLMEvent>]
 const NO_EVENTS: StepResult["1"] = []
 
 // `response.completed` / `response.incomplete` are clean finishes that emit a
-// `finish` event; `response.failed` is a hard failure. All three end the stream,
-// so keep this set aligned with `step` and the protocol's terminal predicate.
-const TERMINAL_TYPES = new Set(["response.completed", "response.incomplete", "response.failed"])
+// `finish` event; `response.failed` and `error` are hard failures. All four end
+// the stream, so keep this set aligned with `step` and the protocol's terminal predicate.
+const TERMINAL_TYPES = new Set(["error", "response.completed", "response.incomplete", "response.failed"])
 export const terminal = (event: Event) => TERMINAL_TYPES.has(event.type)
 
 const onOutputTextDelta = (state: ParserState, event: Event, id: string): StepResult => {
@@ -966,16 +1001,24 @@ const providerErrorMessage = (event: Event, fallback: string): string => {
   return message || code || fallback
 }
 
-const providerError = (state: ParserState, event: Event, fallback: string) => {
+export const providerFailure = (id: string, event: Event, fallback: string) => {
   const code = event.code || event.error?.code || event.response?.error?.code || undefined
   const message = providerErrorMessage(event, fallback)
+  const status =
+    typeof event.status === "number"
+      ? event.status
+      : typeof event.status_code === "number"
+        ? event.status_code
+        : undefined
   return new AIError({
-    module: state.id,
+    module: id,
     method: "stream",
-    reason: classifyProviderFailure({ message, code }),
+    reason: classifyProviderFailure({ message, code, status }),
   })
 }
 
+const providerError = (state: ParserState, event: Event, fallback: string) => providerFailure(state.id, event, fallback)
+
 export const step = (state: ParserState, event: Event) => {
   if (event.type === "response.output_text.delta" || event.type === "response.output_text.done") {
     if (!event.item_id) return ProviderShared.eventError(state.id, `${event.type} is missing item_id`)
@@ -1015,7 +1058,11 @@ export const step = (state: ParserState, event: Event) => {
   if (event.type === "response.completed" || event.type === "response.incomplete")
     return Effect.succeed(onResponseFinish(state, event))
   if (event.type === "response.failed") return providerError(state, event, `${state.name} response failed`)
-  if (event.type === "error") return providerError(state, event, `${state.name} stream error`)
+  if (event.type === "error")
+    return decodeKnownErrorEvent(event).pipe(
+      Effect.mapError(() => ProviderShared.eventError(state.id, `${state.name} returned a malformed error event`)),
+      Effect.flatMap(() => providerError(state, event, `${state.name} stream error`)),
+    )
   return Effect.succeed<StepResult>([state, NO_EVENTS])
 }
 

packages/ai/src/protocols/openai-responses-channel.ts

@@ -0,0 +1,164 @@
+import { AIError, TransportReason } from "../schema/index.js"
+import type { ChannelCheckpoint, ChannelObservation, WebSocketChannelDriver } from "../route/transport/index.js"
+import { Effect, Option, Schema } from "effect"
+import * as ProviderShared from "./shared.js"
+import { OpenResponses } from "./open-responses.js"
+
+const PROTOCOL = "openai-responses.websocket.v1"
+const VERSION = 1
+const decodeEvent = Schema.decodeUnknownEffect(OpenResponses.protocol.stream.event)
+
+interface CheckpointValue {
+  readonly version: typeof VERSION
+  readonly responseID: string
+  readonly request: Readonly<Record<string, unknown>>
+  readonly output: ReadonlyArray<unknown>
+}
+
+export interface DriverInput {
+  readonly id: string
+  readonly name: string
+  readonly request: Readonly<Record<string, unknown>>
+  readonly message: string
+  readonly base: WebSocketChannelDriver
+}
+
+const checkpointValue = (checkpoint: ChannelCheckpoint | undefined): CheckpointValue | undefined => {
+  if (checkpoint?.protocol !== PROTOCOL || !ProviderShared.isRecord(checkpoint.value)) return undefined
+  if (checkpoint.value.version !== VERSION) return undefined
+  if (typeof checkpoint.value.responseID !== "string" || checkpoint.value.responseID.trim().length === 0)
+    return undefined
+  if (!ProviderShared.isRecord(checkpoint.value.request) || !Array.isArray(checkpoint.value.output)) return undefined
+  return {
+    version: VERSION,
+    responseID: checkpoint.value.responseID,
+    request: checkpoint.value.request,
+    output: checkpoint.value.output,
+  }
+}
+
+const canonical = (value: unknown): string => {
+  if (value === undefined) return "undefined"
+  if (Array.isArray(value)) return `[${value.map(canonical).join(",")}]`
+  if (!ProviderShared.isRecord(value)) return ProviderShared.encodeJson(value)
+  return `{${Object.keys(value)
+    .sort()
+    .map((key) => `${ProviderShared.encodeJson(key)}:${canonical(value[key])}`)
+    .join(",")}}`
+}
+
+const json = (value: unknown) => {
+  if (typeof value !== "string") return value
+  return Option.getOrElse(Schema.decodeUnknownOption(ProviderShared.Json)(value), () => value)
+}
+
+const comparable = (value: unknown) => {
+  if (!ProviderShared.isRecord(value)) return value
+  if (value.type === "message" && value.role === "assistant")
+    return {
+      role: "assistant",
+      content: value.content,
+      ...(value.phase === undefined ? {} : { phase: value.phase }),
+    }
+  if (value.type === "function_call")
+    return {
+      type: value.type,
+      call_id: value.call_id,
+      name: value.name,
+      arguments: json(value.arguments),
+    }
+  if (value.type === "reasoning")
+    return {
+      type: value.type,
+      summary: value.summary,
+      encrypted_content: value.encrypted_content,
+    }
+  return value
+}
+
+const invariant = (request: Readonly<Record<string, unknown>>) => {
+  const { type: _type, input: _input, previous_response_id: _previousResponseID, ...rest } = request
+  return rest
+}
+
+const incremental = (
+  request: Readonly<Record<string, unknown>>,
+  checkpoint: CheckpointValue,
+): ReadonlyArray<unknown> | undefined => {
+  const input = request.input
+  const previousInput = checkpoint.request.input
+  if (!Array.isArray(input) || !Array.isArray(previousInput)) return undefined
+  if (canonical(invariant(request)) !== canonical(invariant(checkpoint.request))) return undefined
+  const baseline = [...previousInput, ...checkpoint.output]
+  if (input.length <= baseline.length) return undefined
+  if (!baseline.every((item, index) => canonical(comparable(item)) === canonical(comparable(input[index]))))
+    return undefined
+  return input.slice(baseline.length)
+}
+
+const code = (event: OpenResponses.Event) => event.code || event.error?.code || event.response?.error?.code || undefined
+
+const rejected = (
+  input: DriverInput,
+  observation: Extract<ChannelObservation, { readonly type: "provider-failure" }>,
+  recovery: "retry-full" | "rotate-and-retry-full",
+): ChannelObservation => ({
+  type: "rejected",
+  recovery,
+  error: new AIError({
+    module: input.id,
+    method: "stream",
+    reason: new TransportReason({
+      message: observation.error.message,
+      transport: "websocket",
+      operation: "read",
+      phase: "receive",
+      delivery: "rejected",
+      recovery,
+    }),
+  }),
+})
+
+export const driver = (input: DriverInput): WebSocketChannelDriver => {
+  const { previous_response_id: _previousResponseID, ...request } = input.request
+  let output: unknown[] = []
+  return {
+    create: (checkpoint) =>
+      Effect.sync(() => {
+        output = []
+        const previous = checkpointValue(checkpoint)
+        const delta = previous ? incremental(request, previous) : undefined
+        if (!previous || !delta) return { message: ProviderShared.encodeJson(request), mode: "full" as const }
+        return {
+          message: ProviderShared.encodeJson({ ...request, input: delta, previous_response_id: previous.responseID }),
+          mode: "incremental" as const,
+        }
+      }),
+    observe: (create, frame) =>
+      Effect.gen(function* () {
+        const event = yield* decodeEvent(frame).pipe(
+          Effect.mapError(() => ProviderShared.eventError(input.id, `Invalid ${input.name} WebSocket event`, frame)),
+        )
+        const observation = yield* input.base.observe(create, frame)
+        if (event.type === "response.output_item.done" && event.item) output.push(event.item)
+        if (observation.type === "provider-failure") {
+          const rejection = code(event)
+          if (rejection === "previous_response_not_found") return rejected(input, observation, "retry-full")
+          if (rejection === "websocket_connection_limit_reached")
+            return rejected(input, observation, "rotate-and-retry-full")
+        }
+        if (observation.type !== "completed") return observation
+        const responseID = event.response?.id
+        if (!responseID || responseID.trim().length === 0) return observation
+        return {
+          ...observation,
+          checkpoint: {
+            protocol: PROTOCOL,
+            value: { version: VERSION, responseID, request, output: output.slice() } satisfies CheckpointValue,
+          },
+        }
+      }),
+  }
+}
+
+export const OpenAIResponsesChannel = { driver } as const

packages/ai/src/protocols/openai-responses.ts

@@ -1,18 +1,23 @@
 import { Effect, Encoding, Schema } from "effect"
+import { Headers } from "effect/unstable/http"
 import { Route } from "../route/client.js"
 import { Auth } from "../route/auth.js"
 import { Endpoint } from "../route/endpoint.js"
 import { Protocol } from "../route/protocol.js"
-import { HttpTransport, WebSocketTransport } from "../route/transport/index.js"
+import { HttpTransport } from "../route/transport/index.js"
 import { LLMEvent, LLMRequest, type JsonSchema, type ToolDefinition } from "../schema/index.js"
 import { OpenResponses } from "./open-responses.js"
 import { optionalArray, ProviderShared } from "./shared.js"
 import { Lifecycle } from "./utils/lifecycle.js"
 import { OpenAIImage } from "./utils/openai-image.js"
 import { ToolSchemaProjection } from "./utils/tool-schema.js"
+import { OpenResponsesChannel } from "./open-responses-channel.js"
+import { OpenAIResponsesChannel } from "./openai-responses-channel.js"
 
 const ADAPTER = "openai-responses"
 const NAME = "OpenAI Responses"
+const WEBSOCKET_PROTOCOL_HEADER = "responses_websockets=2026-02-06"
+const WEBSOCKET_ROTATE_AFTER_MS = 55 * 60 * 1000
 export const DEFAULT_BASE_URL = "https://api.openai.com/v1"
 export const PATH = OpenResponses.PATH
 
@@ -57,16 +62,6 @@ const OpenAIResponsesBody = Schema.Struct({
 })
 export type OpenAIResponsesBody = Schema.Schema.Type<typeof OpenAIResponsesBody>
 
-const OpenAIResponsesWebSocketMessage = Schema.StructWithRest(
-  Schema.Struct({
-    type: Schema.tag("response.create"),
-    ...OpenAIResponsesCoreFields,
-  }),
-  [Schema.Record(Schema.String, Schema.Unknown)],
-)
-type OpenAIResponsesWebSocketMessage = Schema.Schema.Type<typeof OpenAIResponsesWebSocketMessage>
-const encodeWebSocketMessage = Schema.encodeSync(Schema.fromJsonString(OpenAIResponsesWebSocketMessage))
-
 const extension = {
   id: ADAPTER,
   name: NAME,
@@ -249,6 +244,13 @@ const endpoint = Endpoint.path<OpenAIResponsesBody>(PATH, { baseURL: DEFAULT_BAS
 const auth = Auth.none
 
 export const httpTransport = HttpTransport.sseJson.with<OpenAIResponsesBody>()
+export const transport = OpenResponsesChannel.transport<OpenAIResponsesBody>({
+  id: ADAPTER,
+  name: NAME,
+  rotateAfterMs: WEBSOCKET_ROTATE_AFTER_MS,
+  headers: (headers) => Headers.set(headers, "openai-beta", headers["openai-beta"] ?? WEBSOCKET_PROTOCOL_HEADER),
+  driver: (input) => OpenAIResponsesChannel.driver({ id: ADAPTER, name: NAME, ...input }),
+})
 
 export const route = Route.make({
   id: ADAPTER,
@@ -257,36 +259,7 @@ export const route = Route.make({
   protocol,
   endpoint,
   auth,
-  transport: httpTransport,
-  defaults: { providerOptions: { openai: { store: false } } },
-})
-
-const decodeWebSocketMessage = ProviderShared.validateWith(Schema.decodeUnknownEffect(OpenAIResponsesWebSocketMessage))
-
-const webSocketMessage = (body: OpenAIResponsesBody | Record<string, unknown>) =>
-  Effect.gen(function* () {
-    if (!ProviderShared.isRecord(body))
-      return yield* ProviderShared.invalidRequest("OpenAI Responses WebSocket body must be a JSON object")
-    const { stream: _stream, ...message } = body
-    return yield* decodeWebSocketMessage({ ...message, type: "response.create" })
-  })
-
-export const webSocketTransport = WebSocketTransport.jsonTransport.with<
-  OpenAIResponsesBody,
-  OpenAIResponsesWebSocketMessage
->({
-  toMessage: webSocketMessage,
-  encodeMessage: encodeWebSocketMessage,
-})
-
-export const webSocketRoute = Route.make({
-  id: `${ADAPTER}-websocket`,
-  provider: "openai",
-  providerMetadataKey: "openai",
-  protocol,
-  endpoint,
-  auth,
-  transport: webSocketTransport,
+  transport,
   defaults: { providerOptions: { openai: { store: false } } },
 })
 

packages/ai/src/provider-error.ts

@@ -67,6 +67,7 @@ const SERVER_CODES = new Set([
   "overloaded_error",
   "server_error",
   "server_is_overloaded",
+  "slow_down",
   "serviceunavailableexception",
 ])
 const INVALID_REQUEST_CODES = new Set(["invalid_prompt", "invalid_request_error", "validationexception"])

packages/ai/src/providers/openai.ts

@@ -12,7 +12,7 @@ export type { OpenAIImageOptions } from "../protocols/openai-images.js"
 
 export const id = ProviderID.make("openai")
 
-export const routes = [OpenAIResponses.route, OpenAIResponses.webSocketRoute, OpenAIChat.route]
+export const routes = [OpenAIResponses.route, OpenAIChat.route]
 
 // This provider facade wraps the lower-level Responses and Chat model factories
 // with OpenAI-specific conveniences: typed options, API-key sugar, env fallback,
@@ -63,7 +63,6 @@ export interface Settings extends ProviderPackage.Settings {
   readonly organization?: string
   readonly project?: string
   readonly queryParams?: Readonly<Record<string, string>>
-  readonly transport?: "http" | "websocket"
   readonly providerOptions?: OpenAIProviderOptionsInput
 }
 
@@ -82,17 +81,12 @@ const configuredRoute = <Body, Prepared>(route: Route<Body, Prepared>, input: Co
 
 export const configure = (input: Config = {}) => {
   const responsesRoute = configuredRoute(OpenAIResponses.route, input)
-  const responsesWebSocketRoute = configuredRoute(OpenAIResponses.webSocketRoute, input)
   const chatRoute = configuredRoute(OpenAIChat.route, input)
   const modelDefaults = defaults(input)
   const responses = (id: string | ModelID) =>
     responsesRoute
       .with(withOpenAIOptions(id, modelDefaults, { textVerbosity: true }))
       .model<OpenAIProviderOptionsInput>({ id })
-  const responsesWebSocket = (id: string | ModelID) =>
-    responsesWebSocketRoute
-      .with(withOpenAIOptions(id, modelDefaults, { textVerbosity: true }))
-      .model<OpenAIProviderOptionsInput>({ id })
   const chat = (id: string | ModelID) =>
     chatRoute.with(withOpenAIOptions(id, modelDefaults)).model<OpenAIProviderOptionsInput>({ id })
   const image = (modelID: string | ModelID) =>
@@ -111,7 +105,6 @@ export const configure = (input: Config = {}) => {
     id,
     model: responses,
     responses,
-    responsesWebSocket,
     chat,
     image,
     configure,
@@ -138,10 +131,7 @@ const config = (settings: Settings): Config => {
 }
 
 export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsInput>["model"] = (modelID, settings) => {
-  const configured = configure(config(settings))
-  if (settings.transport === undefined || settings.transport === "http") return configured.responses(modelID)
-  if (settings.transport === "websocket") return configured.responsesWebSocket(modelID)
-  throw new Error(`Unsupported OpenAI Responses transport: ${String(settings.transport)}`)
+  return configure(config(settings)).responses(modelID)
 }
 
 export const chatModel: ProviderPackage.Definition<Settings, OpenAIProviderOptionsInput>["model"] = (
@@ -149,6 +139,5 @@ export const chatModel: ProviderPackage.Definition<Settings, OpenAIProviderOptio
   settings,
 ) => configure(config(settings)).chat(modelID)
 export const responses = provider.responses
-export const responsesWebSocket = provider.responsesWebSocket
 export const chat = provider.chat
 export const image = provider.image

packages/ai/src/route/client.ts

@@ -1,12 +1,10 @@
 import { Cause, Context, Effect, Layer, Schema, Stream } from "effect"
-import * as Option from "effect/Option"
 import { Auth } from "./auth.js"
 import { Endpoint, type EndpointPatch } from "./endpoint.js"
 import { RequestExecutor } from "./executor.js"
 import { Framing } from "./framing.js"
 import { HttpTransport } from "./transport/index.js"
-import type { HttpMiddleware, Transport, TransportRuntime } from "./transport/index.js"
-import { WebSocketExecutor } from "./transport/index.js"
+import type { HttpMiddleware, Transport, TransportRuntime, WebSocketChannelExecutor } from "./transport/index.js"
 import type { Protocol } from "./protocol.js"
 import { applyCachePolicy } from "../cache-policy.js"
 import * as ProviderShared from "../protocols/shared.js"
@@ -58,6 +56,7 @@ export interface Route<Body, Prepared = unknown> {
     prepared: Prepared,
     request: LLMRequest,
     runtime: TransportRuntime,
+    options?: StreamOptions,
   ) => Stream.Stream<LLMEvent, AIError>
 }
 
@@ -157,6 +156,7 @@ export interface Interface {
 
 export interface StreamOptions {
   readonly http?: HttpMiddleware
+  readonly webSocket?: WebSocketChannelExecutor
 }
 
 export interface StreamMethod {
@@ -314,23 +314,29 @@ function makeFromTransport<Body, Prepared, Frame, Event, State>(
           encodeBody,
           headers: routeInput.headers,
           middleware: options?.http,
+          webSocket: options?.webSocket,
         }),
-      streamPrepared: (prepared: Prepared, request: LLMRequest, runtime: TransportRuntime) => {
+      streamPrepared: (prepared: Prepared, request: LLMRequest, runtime: TransportRuntime, options?: StreamOptions) => {
         const route = `${request.model.provider}/${request.model.route.id}`
-        const events = routeInput.transport
-          .frames(prepared, request, runtime)
-          .pipe(
-            Stream.mapEffect(decodeEvent(route)),
-            protocol.stream.terminal ? Stream.takeUntil(protocol.stream.terminal) : (stream) => stream,
-          )
-        return events.pipe(
-          Stream.mapAccumEffect(
-            () => protocol.stream.initial(request),
-            protocol.stream.step,
-            protocol.stream.onHalt ? { onHalt: protocol.stream.onHalt } : undefined,
+        return Stream.unwrap(
+          routeInput.transport.execute(prepared, request, runtime, options).pipe(
+            Effect.map((execution) => {
+              const events = execution.frames.pipe(
+                Stream.mapEffect(decodeEvent(route)),
+                protocol.stream.terminal ? Stream.takeUntil(protocol.stream.terminal) : (stream) => stream,
+              )
+              const stream = events.pipe(
+                Stream.mapAccumEffect(
+                  () => protocol.stream.initial(request),
+                  protocol.stream.step,
+                  protocol.stream.onHalt ? { onHalt: protocol.stream.onHalt } : undefined,
+                ),
+                Stream.catchCause((cause) => Stream.fail(streamError(route, `Failed to read ${route} stream`, cause))),
+                requireTerminalEvent(route),
+              )
+              return execution.complete ? stream.pipe(Stream.onEnd(execution.complete)) : stream
+            }),
           ),
-          Stream.catchCause((cause) => Stream.fail(streamError(route, `Failed to read ${route} stream`, cause))),
-          requireTerminalEvent(route),
         )
       },
     } satisfies Route<Body, Prepared>
@@ -413,7 +419,7 @@ const streamRequestWith = (runtime: TransportRuntime) => (request: LLMRequest, o
   Stream.unwrap(
     Effect.gen(function* () {
       const compiled = yield* compile(request, options)
-      return compiled.route.streamPrepared(compiled.prepared, compiled.request, runtime)
+      return compiled.route.streamPrepared(compiled.prepared, compiled.request, runtime, options)
     }),
   )
 
@@ -451,7 +457,6 @@ export const layer: Layer.Layer<Service, never, RequestExecutor.Service> = Layer
   Effect.gen(function* () {
     const stream = streamRequestWith({
       http: yield* RequestExecutor.Service,
-      webSocket: Option.getOrUndefined(yield* Effect.serviceOption(WebSocketExecutor.Service)),
     })
     return Service.of({ stream, generate: generateWith(stream) })
   }),

packages/ai/src/route/executor.ts

@@ -34,44 +34,8 @@ export type HttpMiddleware = (
 
 export class Service extends Context.Service<Service, Interface>()("@opencode/AI/RequestExecutor") {}
 
-const BODY_LIMIT = 16_384
-const REDACTED = "<redacted>"
-
-// One source of truth for what counts as a sensitive name across headers,
-// URL query keys, and field names embedded inside request/response bodies.
-//
-// `SENSITIVE_NAME` is used as both a substring matcher (for free-form header
-// names like `Authorization` / `X-API-Key`) and as the body-field alternation
-// list. `SHORT_QUERY_NAME` covers anchored short keys like `?key=…` / `?sig=…`
-// that are too generic to redact substring-style without false positives.
-const SENSITIVE_NAME_SOURCE =
-  "authorization|api[-_]?key|access[-_]?token|refresh[-_]?token|id[-_]?token|token|secret|credential|signature|x-amz-signature"
-const SENSITIVE_NAME = new RegExp(SENSITIVE_NAME_SOURCE, "i")
-const SHORT_QUERY_NAME = /^(key|sig)$/i
-const SENSITIVE_BODY_FIELD = new RegExp(`(?:${SENSITIVE_NAME_SOURCE}|key)`, "i")
-const REDACT_JSON_FIELD = new RegExp(`("(?:${SENSITIVE_BODY_FIELD.source})"\\s*:\\s*)"[^"]*"`, "gi")
-const REDACT_QUERY_FIELD = new RegExp(`((?:${SENSITIVE_BODY_FIELD.source})=)[^&\\s"]+`, "gi")
-
-const isSensitiveHeaderName = (name: string) => SENSITIVE_NAME.test(name)
-
-const isSensitiveQueryName = (name: string) => isSensitiveHeaderName(name) || SHORT_QUERY_NAME.test(name)
-
-const redactHeaders = (headers: Headers.Headers, redactedNames: ReadonlyArray<string | RegExp>) =>
-  Object.fromEntries(
-    Object.entries(Headers.redact(headers, [...redactedNames, SENSITIVE_NAME])).map(([name, value]) => [
-      name,
-      String(value),
-    ]),
-  )
-
-const redactUrl = (value: string) => {
-  if (!URL.canParse(value)) return REDACTED
-  const url = new URL(value)
-  url.searchParams.forEach((_, key) => {
-    if (isSensitiveQueryName(key)) url.searchParams.set(key, REDACTED)
-  })
-  return url.toString()
-}
+const headerDetails = (headers: Headers.Headers) =>
+  Object.fromEntries(Object.entries(headers).map(([name, value]) => [name, String(value)]))
 
 const normalizedHeaders = (headers: Headers.Headers) =>
   Object.fromEntries(Object.entries(headers).map(([key, value]) => [key.toLowerCase(), value]))
@@ -144,58 +108,22 @@ const rateLimitDetails = (headers: Record<string, string>, retryAfter: number |
   })
 }
 
-const requestDetails = (request: HttpClientRequest.HttpClientRequest, redactedNames: ReadonlyArray<string | RegExp>) =>
+const requestDetails = (request: HttpClientRequest.HttpClientRequest) =>
   new HttpRequestDetails({
     method: request.method,
-    url: redactUrl(request.url),
-    headers: redactHeaders(request.headers, redactedNames),
+    url: request.url,
+    headers: headerDetails(request.headers),
   })
 
-const responseDetails = (
-  response: HttpClientResponse.HttpClientResponse,
-  redactedNames: ReadonlyArray<string | RegExp>,
-) =>
+const responseDetails = (response: HttpClientResponse.HttpClientResponse) =>
   new HttpResponseDetails({
     status: response.status,
-    headers: redactHeaders(response.headers, redactedNames),
+    headers: headerDetails(response.headers),
   })
 
-const secretValues = (request: HttpClientRequest.HttpClientRequest) => {
-  const values = new Set<string>()
-  const add = (value: string) => {
-    if (value.length < 4) return
-    values.add(value)
-    values.add(encodeURIComponent(value))
-  }
-
-  Object.entries(request.headers).forEach(([name, value]) => {
-    if (!isSensitiveHeaderName(name)) return
-    add(value)
-    const bearer = /^Bearer\s+(.+)$/i.exec(value)?.[1]
-    if (bearer) add(bearer)
-  })
-
-  if (!URL.canParse(request.url)) return values
-  new URL(request.url).searchParams.forEach((value, key) => {
-    if (isSensitiveQueryName(key)) add(value)
-  })
-  return values
-}
-
-// Two passes: structural (redact `"name": "value"` and `name=value` patterns
-// for any field name that looks sensitive) plus literal (replace any actual
-// secret values we sent in the request, in case the response echoes one back).
-const redactBody = (body: string, secrets: ReadonlySet<string>) =>
-  Array.from(secrets).reduce(
-    (text, secret) => text.split(secret).join(REDACTED),
-    body.replace(REDACT_JSON_FIELD, `$1"${REDACTED}"`).replace(REDACT_QUERY_FIELD, `$1${REDACTED}`),
-  )
-
-const responseBody = (body: string | void, secrets: ReadonlySet<string>) => {
+const responseBody = (body: string | void) => {
   if (body === undefined) return {}
-  const redacted = redactBody(body, secrets)
-  if (redacted.length <= BODY_LIMIT) return { body: redacted }
-  return { body: redacted.slice(0, BODY_LIMIT), bodyTruncated: true }
+  return { body }
 }
 
 const decodeProviderBody = Schema.decodeUnknownOption(
@@ -207,52 +135,49 @@ const decodeProviderBody = Schema.decodeUnknownOption(
   ),
 )
 
-const providerMessage = (status: number, body: { readonly body?: string }) => {
-  if (body.body && body.body.length <= 500) {
-    const decoded = Option.getOrUndefined(decodeProviderBody(body.body))
-    return `Provider request failed with HTTP ${status}: ${decoded?.error?.message ?? decoded?.message ?? body.body}`
-  }
-  return `Provider request failed with HTTP ${status}`
+const providerMessage = (status: number, body: string | void) => {
+  const decoded = body === undefined ? undefined : Option.getOrUndefined(decodeProviderBody(body))
+  return (
+    [decoded?.error?.message, decoded?.message].find((message) => message?.trim()) ??
+    `Provider request failed with HTTP ${status}`
+  )
 }
 
 const responseHttp = (input: {
   readonly request: HttpClientRequest.HttpClientRequest
   readonly response: HttpClientResponse.HttpClientResponse
-  readonly redactedNames: ReadonlyArray<string | RegExp>
   readonly body: ReturnType<typeof responseBody>
   readonly requestId?: string | undefined
   readonly rateLimit?: HttpRateLimitDetails | undefined
 }) =>
   new HttpContext({
-    request: requestDetails(input.request, input.redactedNames),
-    response: responseDetails(input.response, input.redactedNames),
+    request: requestDetails(input.request),
+    response: responseDetails(input.response),
     ...input.body,
     requestId: input.requestId,
     rateLimit: input.rateLimit,
   })
 
 const statusError =
-  (request: HttpClientRequest.HttpClientRequest, redactedNames: ReadonlyArray<string | RegExp>) =>
-  (response: HttpClientResponse.HttpClientResponse) =>
+  (request: HttpClientRequest.HttpClientRequest) => (response: HttpClientResponse.HttpClientResponse) =>
     Effect.gen(function* () {
       if (response.status < 400) return response
       const body = yield* response.text.pipe(Effect.catch(() => Effect.void))
       const headers = normalizedHeaders(response.headers)
       const retryAfter = retryAfterMs(headers)
       const rateLimit = rateLimitDetails(headers, retryAfter)
-      const details = responseBody(body, secretValues(request))
+      const details = responseBody(body)
       return yield* new AIError({
         module: "RequestExecutor",
         method: "execute",
         reason: classifyProviderFailure({
           status: response.status,
-          message: providerMessage(response.status, details),
+          message: providerMessage(response.status, body),
           retryAfterMs: retryAfter,
           rateLimit,
           http: responseHttp({
             request,
             response,
-            redactedNames,
             body: details,
             requestId: requestId(headers),
             rateLimit,
@@ -262,10 +187,10 @@ const statusError =
     })
 
 // Classifies an HTTP failure captured outside the executor (for example by the
-// AI SDK's own fetch) onto the same reason types and redacted HttpContext that
+// AI SDK's own fetch) onto the same reason types and HttpContext that
 // executor-driven requests produce. The originating request is not available on
 // that path, so the method is assumed (language model calls are always POST),
-// request headers are empty, and only structural body redaction applies.
+// request headers are empty.
 export const classifyHttpFailure = (input: {
   readonly message: string
   readonly url: string
@@ -277,7 +202,7 @@ export const classifyHttpFailure = (input: {
   const headers = normalizedHeaders(Headers.fromInput(input.responseHeaders))
   const retryAfter = retryAfterMs(headers)
   const rateLimit = rateLimitDetails(headers, retryAfter)
-  const details = responseBody(input.responseBody ?? undefined, new Set<string>())
+  const details = responseBody(input.responseBody)
   return classifyProviderFailure({
     message: input.message,
     status: input.status,
@@ -285,11 +210,11 @@ export const classifyHttpFailure = (input: {
     retryAfterMs: retryAfter,
     rateLimit,
     http: new HttpContext({
-      request: new HttpRequestDetails({ method: "POST", url: redactUrl(input.url), headers: {} }),
+      request: new HttpRequestDetails({ method: "POST", url: input.url, headers: {} }),
       response:
         input.status === undefined
           ? undefined
-          : new HttpResponseDetails({ status: input.status, headers: redactHeaders(Headers.fromInput(headers), []) }),
+          : new HttpResponseDetails({ status: input.status, headers: headerDetails(Headers.fromInput(headers)) }),
       ...details,
       requestId: requestId(headers),
       rateLimit,
@@ -319,7 +244,6 @@ const httpError = (input: {
   readonly error: unknown
   readonly request: HttpClientRequest.HttpClientRequest
   readonly operation: HttpOperation
-  readonly redactedNames: ReadonlyArray<string | RegExp>
 }) => {
   const request = HttpClientError.isHttpClientError(input.error) ? input.error.request : input.request
   const transportError = (failure: { readonly message: string; readonly code?: string | undefined }) =>
@@ -331,8 +255,8 @@ const httpError = (input: {
         transport: "http",
         operation: input.operation,
         code: failure.code,
-        url: redactUrl(request.url),
-        http: new HttpContext({ request: requestDetails(request, input.redactedNames) }),
+        url: request.url,
+        http: new HttpContext({ request: requestDetails(request) }),
       }),
     })
 
@@ -343,7 +267,7 @@ const httpError = (input: {
   const native = nativeTransportFailure(source)
   const code = native?.code
   const raw = native?.message ?? (input.error instanceof Error ? input.error.message : undefined)
-  const detail = raw ? redactBody(raw, secretValues(request)) : undefined
+  const detail = raw
   const message = code && detail && !detail.includes(code) ? `${code}: ${detail}` : detail
 
   if (Cause.isTimeoutError(input.error) || Cause.isTimeoutError(source))
@@ -369,10 +293,9 @@ export const stream = (
 ): Stream.Stream<Uint8Array, AIError> =>
   Stream.unwrap(
     Effect.gen(function* () {
-      const redactedNames = yield* Headers.CurrentRedactedNames
       const response = yield* executor.execute(request, middleware)
       return response.stream.pipe(
-        Stream.mapError((error) => httpError({ error, request: response.request, operation: "read", redactedNames })),
+        Stream.mapError((error) => httpError({ error, request: response.request, operation: "read" })),
       )
     }),
   )
@@ -383,19 +306,18 @@ export const layer: Layer.Layer<Service, never, HttpClient.HttpClient> = Layer.e
     const http = yield* HttpClient.HttpClient
     const executeOnce = (request: HttpClientRequest.HttpClientRequest, middleware?: HttpMiddleware) =>
       Effect.gen(function* () {
-        const redactedNames = yield* Headers.CurrentRedactedNames
         if (!middleware)
           return yield* http.execute(request).pipe(
-            Effect.mapError((error) => httpError({ error, request, operation: "request", redactedNames })),
-            Effect.flatMap(statusError(request, redactedNames)),
+            Effect.mapError((error) => httpError({ error, request, operation: "request" })),
+            Effect.flatMap(statusError(request)),
           )
 
         const response = yield* middleware(request, (input) =>
           http
             .execute(input)
             .pipe(Effect.mapError((cause) => (cause instanceof Error ? cause : new Error(String(cause))))),
-        ).pipe(Effect.mapError((error) => httpError({ error, request, operation: "request", redactedNames })))
-        return yield* statusError(response.request, redactedNames)(response)
+        ).pipe(Effect.mapError((error) => httpError({ error, request, operation: "request" })))
+        return yield* statusError(response.request)(response)
       })
     return Service.of({
       execute: executeOnce,

packages/ai/src/route/index.ts

@@ -16,11 +16,28 @@ export { AuthOptions } from "./auth-options.js"
 export { Endpoint } from "./endpoint.js"
 export { Framing } from "./framing.js"
 export { Protocol } from "./protocol.js"
-export { HttpTransport, WebSocketExecutor, WebSocketTransport } from "./transport/index.js"
+export { HttpTransport, WebSocketTransport } from "./transport/index.js"
 export * as Transport from "./transport/index.js"
 export type { Definition as AuthShape, AuthInput, Credential, CredentialError } from "./auth.js"
 export type { ApiKeyMode, AuthOverride, ProviderAuthOption } from "./auth-options.js"
 export type { Definition as EndpointFn, EndpointInput } from "./endpoint.js"
 export type { Definition as FramingDef } from "./framing.js"
 export type { Protocol as ProtocolDef } from "./protocol.js"
-export type { HttpHandler, HttpMiddleware, Transport as TransportDef, TransportRuntime } from "./transport/index.js"
+export type {
+  ChannelCheckpoint,
+  ChannelCreate,
+  ChannelObservation,
+  HttpHandler,
+  HttpMiddleware,
+  Transport as TransportDef,
+  TransportExecuteOptions,
+  TransportExecution,
+  TransportRuntime,
+  WebSocketConnection,
+  WebSocketChannelDriver,
+  WebSocketChannelExchange,
+  WebSocketChannelExecution,
+  WebSocketChannelExecutor,
+  WebSocketConnector,
+  WebSocketRequest,
+} from "./transport/index.js"

packages/ai/src/route/transport/http.ts

@@ -87,8 +87,10 @@ export const httpJson = <Body, Frame>(input: HttpJsonInput<Body, Frame>): HttpJs
         middleware: prepareInput.middleware,
       }
     }),
-  frames: (prepared, _request, runtime) =>
-    prepared.framing.frame(RequestExecutor.stream(runtime.http, prepared.request, prepared.middleware)),
+  execute: (prepared, _request, runtime) =>
+    Effect.succeed({
+      frames: prepared.framing.frame(RequestExecutor.stream(runtime.http, prepared.request, prepared.middleware)),
+    }),
 })
 
 export const sseJson = {

packages/ai/src/route/transport/index.ts

@@ -1,19 +1,33 @@
-import type { Effect, Stream } from "effect"
+import type { Effect, Scope, Stream } from "effect"
 import { Endpoint } from "../endpoint.js"
 import { Auth } from "../auth.js"
 import type { HttpMiddleware, Interface as RequestExecutorInterface } from "../executor.js"
-import type { Interface as WebSocketExecutorInterface } from "./websocket.js"
+import type { WebSocketChannelExecutor } from "./websocket-channel.js"
 import type { AIError, LLMRequest } from "../../schema/index.js"
 
 export interface TransportRuntime {
   readonly http: RequestExecutorInterface
-  readonly webSocket?: WebSocketExecutorInterface
+}
+
+export interface TransportExecution<Frame> {
+  readonly frames: Stream.Stream<Frame, AIError>
+  /** Optional successful-consumption acknowledgement. HTTP leaves this absent. */
+  readonly complete?: Effect.Effect<void>
+}
+
+export interface TransportExecuteOptions {
+  readonly webSocket?: WebSocketChannelExecutor
 }
 
 export interface Transport<Body, Prepared, Frame> {
   readonly id: string
   readonly prepare: (input: TransportPrepareInput<Body>) => Effect.Effect<Prepared, AIError>
-  readonly frames: (prepared: Prepared, request: LLMRequest, runtime: TransportRuntime) => Stream.Stream<Frame, AIError>
+  readonly execute: (
+    prepared: Prepared,
+    request: LLMRequest,
+    runtime: TransportRuntime,
+    options?: TransportExecuteOptions,
+  ) => Effect.Effect<TransportExecution<Frame>, AIError, Scope.Scope>
 }
 
 export interface TransportPrepareInput<Body> {
@@ -24,8 +38,19 @@ export interface TransportPrepareInput<Body> {
   readonly encodeBody: (body: Body) => string
   readonly headers?: (input: { readonly request: LLMRequest }) => Record<string, string>
   readonly middleware?: HttpMiddleware
+  readonly webSocket?: WebSocketChannelExecutor
 }
 
 export * as HttpTransport from "./http.js"
 export type { HttpHandler, HttpMiddleware } from "../executor.js"
-export { WebSocketExecutor, WebSocketTransport } from "./websocket.js"
+export type {
+  ChannelCheckpoint,
+  ChannelCreate,
+  ChannelObservation,
+  WebSocketChannelDriver,
+  WebSocketChannelExchange,
+  WebSocketChannelExecution,
+  WebSocketChannelExecutor,
+} from "./websocket-channel.js"
+export type { WebSocketConnection, WebSocketConnector, WebSocketRequest } from "./websocket.js"
+export { WebSocketTransport } from "./websocket.js"

packages/ai/src/route/transport/websocket-channel.ts

@@ -0,0 +1,50 @@
+import type { Effect, Scope, Stream } from "effect"
+import type { Headers } from "effect/unstable/http"
+import type { AIError } from "../../schema/index.js"
+
+export interface WebSocketChannelExecutor {
+  readonly execute: (
+    exchange: WebSocketChannelExchange,
+  ) => Effect.Effect<WebSocketChannelExecution, AIError, Scope.Scope>
+}
+
+export interface WebSocketChannelExecution {
+  readonly frames: Stream.Stream<string, AIError>
+  /** Commits staged state after the decoded Route stream ends successfully. */
+  readonly complete: Effect.Effect<void>
+}
+
+export interface WebSocketChannelExchange {
+  readonly id: string
+  readonly connect: {
+    readonly url: string
+    readonly headers: Headers.Headers
+    /** Provider-safe connection age after which Core should rotate before sending. */
+    readonly rotateAfterMs?: number
+  }
+  readonly fallback: () => Stream.Stream<string, AIError>
+  readonly driver: WebSocketChannelDriver
+}
+
+export interface WebSocketChannelDriver {
+  readonly create: (checkpoint: ChannelCheckpoint | undefined) => Effect.Effect<ChannelCreate, AIError>
+  readonly observe: (create: ChannelCreate, frame: string) => Effect.Effect<ChannelObservation, AIError>
+}
+
+export interface ChannelCreate {
+  readonly message: string
+  readonly mode: "full" | "incremental"
+}
+
+export type ChannelObservation =
+  | { readonly type: "frame"; readonly frame: string }
+  | { readonly type: "completed"; readonly frame: string; readonly checkpoint?: ChannelCheckpoint }
+  | { readonly type: "incomplete"; readonly frame: string }
+  | { readonly type: "provider-failure"; readonly error: AIError }
+  | { readonly type: "rejected"; readonly error: AIError; readonly recovery: "retry-full" }
+  | { readonly type: "rejected"; readonly error: AIError; readonly recovery: "rotate-and-retry-full" }
+
+export interface ChannelCheckpoint {
+  readonly protocol: string
+  readonly value: unknown
+}

packages/ai/src/route/transport/websocket.ts

@@ -1,8 +1,15 @@
-import { Cause, Context, Effect, Layer, Queue, Stream } from "effect"
+import { Cause, Effect, Queue, Stream } from "effect"
 import { Headers } from "effect/unstable/http"
+import { Socket } from "effect/unstable/socket"
 import { AIError, TransportReason, type TransportOperation } from "../../schema/index.js"
 import * as HttpTransport from "./http.js"
 import type { Transport } from "./index.js"
+import type {
+  ChannelObservation,
+  WebSocketChannelDriver,
+  WebSocketChannelExchange,
+  WebSocketChannelExecutor,
+} from "./websocket-channel.js"
 
 export interface WebSocketRequest {
   readonly url: string
@@ -15,24 +22,29 @@ export interface WebSocketConnection {
   readonly close: Effect.Effect<void, never>
 }
 
-export interface Interface {
+export interface WebSocketConnector {
   readonly open: (input: WebSocketRequest) => Effect.Effect<WebSocketConnection, AIError>
 }
 
-type WebSocketConstructorWithHeaders = new (
+type WebSocketConstructorWithHeaders = (
   url: string,
   options?: { readonly headers?: Headers.Headers },
 ) => globalThis.WebSocket
 
-export class Service extends Context.Service<Service, Interface>()("@opencode/AI/WebSocketExecutor") {}
-
+const MAX_FRAME_BYTES = 16 * 1024 * 1024
 const transportError = (
   method: string,
   message: string,
-  input: { readonly operation: TransportOperation; readonly url?: string; readonly code?: string },
+  input: {
+    readonly operation: TransportOperation
+    readonly url?: string
+    readonly code?: string
+    readonly phase?: TransportReason["phase"]
+    readonly delivery?: TransportReason["delivery"]
+  },
 ) =>
   new AIError({
-    module: "WebSocketExecutor",
+    module: "WebSocketConnector",
     method,
     reason: new TransportReason({
       message,
@@ -40,9 +52,33 @@ const transportError = (
       operation: input.operation,
       url: input.url,
       code: input.code,
+      phase: input.phase,
+      delivery: input.delivery,
     }),
   })
 
+const annotateTransportError = (
+  error: AIError,
+  input: { readonly phase: TransportReason["phase"]; readonly delivery: TransportReason["delivery"] },
+) =>
+  error.reason._tag === "Transport"
+    ? new AIError({
+        module: error.module,
+        method: error.method,
+        reason: new TransportReason({
+          message: error.reason.message,
+          transport: error.reason.transport,
+          operation: error.reason.operation,
+          code: error.reason.code,
+          url: error.reason.url,
+          http: error.reason.http,
+          phase: input.phase,
+          delivery: input.delivery,
+          recovery: error.reason.recovery,
+        }),
+      })
+    : error
+
 const eventMessage = (event: Event) => {
   if ("message" in event && typeof event.message === "string") return event.message
   return event.type
@@ -63,6 +99,8 @@ const waitOpen = (ws: globalThis.WebSocket, input: WebSocketRequest) => {
         url: input.url,
         operation: "request",
         code: "closed",
+        phase: "connect",
+        delivery: "not-sent",
       }),
     )
   }
@@ -89,6 +127,8 @@ const waitOpen = (ws: globalThis.WebSocket, input: WebSocketRequest) => {
           transportError("open", `Failed to open WebSocket: ${eventMessage(event)}`, {
             url: input.url,
             operation: "request",
+            phase: "connect",
+            delivery: "not-sent",
           }),
         ),
       )
@@ -101,6 +141,8 @@ const waitOpen = (ws: globalThis.WebSocket, input: WebSocketRequest) => {
             url: input.url,
             operation: "request",
             code: String(event.code),
+            phase: "connect",
+            delivery: "not-sent",
           }),
         ),
       )
@@ -112,7 +154,7 @@ const waitOpen = (ws: globalThis.WebSocket, input: WebSocketRequest) => {
   })
 }
 
-const webSocketUrl = (value: string) =>
+export const toWebSocketUrl = (value: string) =>
   Effect.try({
     try: () => {
       const url = new URL(value)
@@ -131,21 +173,31 @@ const webSocketUrl = (value: string) =>
         url: value,
         operation: "request",
         code: "invalid-url",
+        phase: "prepare",
+        delivery: "not-sent",
       }),
   })
 
 export const open = (input: WebSocketRequest) =>
-  Effect.try({
-    try: () =>
-      new (globalThis.WebSocket as unknown as WebSocketConstructorWithHeaders)(input.url, { headers: input.headers }),
-    catch: (error) =>
-      transportError("open", error instanceof Error ? error.message : "Failed to construct WebSocket", {
-        url: input.url,
-        operation: "request",
-      }),
-  }).pipe(Effect.flatMap((ws) => fromWebSocket(ws, input)))
-
-export const layer: Layer.Layer<Service> = Layer.succeed(Service, Service.of({ open }))
+  Effect.gen(function* () {
+    const constructor = yield* Socket.WebSocketConstructor
+    const ws = yield* Effect.try({
+      try: () =>
+        // Platform implementations may extend Effect's browser-compatible constructor with handshake options.
+        // oxlint-disable-next-line typescript-eslint/no-unsafe-type-assertion
+        (constructor as unknown as WebSocketConstructorWithHeaders)(input.url, {
+          headers: input.headers,
+        }),
+      catch: (error) =>
+        transportError("open", error instanceof Error ? error.message : "Failed to construct WebSocket", {
+          url: input.url,
+          operation: "request",
+          phase: "connect",
+          delivery: "not-sent",
+        }),
+    })
+    return yield* fromWebSocket(ws, input)
+  })
 
 export const fromWebSocket = (
   ws: globalThis.WebSocket,
@@ -155,16 +207,52 @@ export const fromWebSocket = (
     yield* waitOpen(ws, input)
     const messages = yield* Queue.bounded<string | Uint8Array, AIError | Cause.Done<void>>(128)
 
+    const oversized = (message: string | Uint8Array) =>
+      typeof message === "string" ? new Blob([message]).size > MAX_FRAME_BYTES : message.byteLength > MAX_FRAME_BYTES
+    const rejectOversized = (message: string | Uint8Array) => {
+      if (!oversized(message)) return false
+      Queue.failCauseUnsafe(
+        messages,
+        Cause.fail(
+          transportError("message", "WebSocket message exceeds the 16 MiB limit", {
+            url: input.url,
+            operation: "read",
+            code: "message-too-large",
+            phase: "receive",
+          }),
+        ),
+      )
+      if (ws.readyState === globalThis.WebSocket.OPEN) ws.close(1009, "Message too large")
+      return true
+    }
+    const offer = (message: string | Uint8Array) => {
+      if (rejectOversized(message)) return
+      if (Queue.offerUnsafe(messages, message)) return
+      Queue.failCauseUnsafe(
+        messages,
+        Cause.fail(
+          transportError("message", "WebSocket inbound queue overflow", {
+            url: input.url,
+            operation: "read",
+            code: "queue-overflow",
+            phase: "receive",
+          }),
+        ),
+      )
+    }
+
     const onMessage = (event: MessageEvent) => {
-      if (typeof event.data === "string") return Queue.offerUnsafe(messages, event.data)
+      if (typeof event.data === "string") return offer(event.data)
       const binary = binaryMessage(event.data)
-      if (binary) return Queue.offerUnsafe(messages, binary)
+      if (binary) return offer(binary)
       Queue.failCauseUnsafe(
         messages,
         Cause.fail(
           transportError("message", "Unsupported WebSocket message payload", {
             url: input.url,
             operation: "read",
+            code: "message",
+            phase: "receive",
           }),
         ),
       )
@@ -176,12 +264,13 @@ export const fromWebSocket = (
           transportError("message", `WebSocket error: ${eventMessage(event)}`, {
             url: input.url,
             operation: "read",
+            code: "message",
+            phase: "receive",
           }),
         ),
       )
     }
     const onClose = (event: CloseEvent) => {
-      if (event.code === 1000 || event.code === 1005) return Queue.endUnsafe(messages)
       Queue.failCauseUnsafe(
         messages,
         Cause.fail(
@@ -189,6 +278,7 @@ export const fromWebSocket = (
             url: input.url,
             operation: "read",
             code: String(event.code),
+            phase: "close",
           }),
         ),
       )
@@ -205,13 +295,26 @@ export const fromWebSocket = (
 
     return {
       sendText: (message) =>
-        Effect.try({
-          try: () => ws.send(message),
-          catch: (error) =>
-            transportError("sendText", error instanceof Error ? error.message : "Failed to send WebSocket message", {
-              url: input.url,
-              operation: "write",
-            }),
+        Effect.suspend(() => {
+          if (ws.readyState !== globalThis.WebSocket.OPEN)
+            return Effect.fail(
+              transportError("sendText", `WebSocket is not open (state ${ws.readyState})`, {
+                url: input.url,
+                operation: "write",
+                phase: "send",
+                delivery: "not-sent",
+              }),
+            )
+          return Effect.try({
+            try: () => ws.send(message),
+            catch: (error) =>
+              transportError("sendText", error instanceof Error ? error.message : "Failed to send WebSocket message", {
+                url: input.url,
+                operation: "write",
+                phase: "send",
+                delivery: "not-sent",
+              }),
+          })
         }),
       messages: Stream.fromQueue(messages),
       close: cleanup.pipe(
@@ -228,6 +331,57 @@ export const fromWebSocket = (
 export const messageText = (message: string | Uint8Array, decoder: TextDecoder) =>
   typeof message === "string" ? message : decoder.decode(message)
 
+const observationFrame = (observation: ChannelObservation) => {
+  if (observation.type === "frame" || observation.type === "completed" || observation.type === "incomplete")
+    return Effect.succeed(observation.frame)
+  return Effect.fail(observation.error)
+}
+
+const observationTerminal = (observation: ChannelObservation) => observation.type !== "frame"
+
+export const makeDirect = (connector: WebSocketConnector): WebSocketChannelExecutor => ({
+  execute: (exchange) =>
+    Effect.gen(function* () {
+      const connection = yield* Effect.acquireRelease(
+        connector
+          .open(exchange.connect)
+          .pipe(Effect.mapError((error) => annotateTransportError(error, { phase: "connect", delivery: "not-sent" }))),
+        (connection) => connection.close,
+      )
+      const create = yield* exchange.driver.create(undefined)
+      yield* connection.sendText(create.message)
+      const decoder = new TextDecoder()
+      let observed = false
+      return {
+        frames: connection.messages.pipe(
+          Stream.map((message) => {
+            observed = true
+            return messageText(message, decoder)
+          }),
+          Stream.mapError((error) =>
+            annotateTransportError(error, {
+              phase: error.reason._tag === "Transport" && error.reason.phase === "close" ? "close" : "receive",
+              delivery: observed ? "accepted" : "ambiguous",
+            }),
+          ),
+          Stream.mapEffect((frame) => exchange.driver.observe(create, frame)),
+          Stream.takeUntil(observationTerminal),
+          Stream.mapEffect(observationFrame),
+        ),
+        complete: Effect.void,
+      }
+    }),
+})
+
+export const direct: Effect.Effect<WebSocketChannelExecutor, never, Socket.WebSocketConstructor> = Effect.gen(
+  function* () {
+    const constructor = yield* Socket.WebSocketConstructor
+    return makeDirect({
+      open: (input) => open(input).pipe(Effect.provideService(Socket.WebSocketConstructor, constructor)),
+    })
+  },
+)
+
 export interface JsonPrepared {
   readonly url: string
   readonly headers: Headers.Headers
@@ -254,33 +408,44 @@ export const json = <Body, Message>(input: JsonInput<Body, Message>): JsonTransp
         ...prepareInput,
       })
       return {
-        url: yield* webSocketUrl(parts.url),
+        url: yield* toWebSocketUrl(parts.url),
         headers: parts.headers,
         message: input.encodeMessage(yield* input.toMessage(parts.jsonBody)),
       }
     }),
-  frames: (prepared, _request, runtime) => {
-    const webSocket = runtime.webSocket
+  execute: (prepared, request, _runtime, options) => {
+    const webSocket = options?.webSocket
     if (!webSocket) {
-      return Stream.fail(
-        transportError("json", "WebSocket JSON transport requires WebSocketExecutor.Service", {
+      return Effect.fail(
+        transportError("json", "WebSocket JSON transport requires StreamOptions.webSocket", {
           url: prepared.url,
           operation: "request",
           code: "unavailable",
+          phase: "prepare",
+          delivery: "not-sent",
         }),
       )
     }
-    const decoder = new TextDecoder()
-    return Stream.unwrap(
-      Effect.gen(function* () {
-        const connection = yield* Effect.acquireRelease(
-          webSocket.open({ url: prepared.url, headers: prepared.headers }),
-          (connection) => connection.close,
-        )
-        yield* connection.sendText(prepared.message)
-        return connection.messages.pipe(Stream.map((message) => messageText(message, decoder)))
-      }),
-    )
+    const driver: WebSocketChannelDriver = {
+      create: () => Effect.succeed({ message: prepared.message, mode: "full" }),
+      observe: (_create, frame) => Effect.succeed({ type: "frame", frame }),
+    }
+    const exchange: WebSocketChannelExchange = {
+      id: request.id ?? "request",
+      connect: { url: prepared.url, headers: prepared.headers },
+      fallback: () =>
+        Stream.fail(
+          transportError("fallback", "WebSocket JSON transport does not provide HTTP fallback", {
+            url: prepared.url,
+            operation: "request",
+            code: "websocket",
+            phase: "fallback",
+            delivery: "not-sent",
+          }),
+        ),
+      driver,
+    }
+    return webSocket.execute(exchange)
   },
 })
 
@@ -289,15 +454,13 @@ export const jsonTransport = {
   with: json,
 } as const
 
-export const WebSocketExecutor = {
-  Service,
-  layer,
-  open,
-  fromWebSocket,
-  messageText,
-} as const
-
 export const WebSocketTransport = {
   json,
   jsonTransport,
+  direct,
+  makeDirect,
+  open,
+  fromWebSocket,
+  messageText,
+  toWebSocketUrl,
 } as const

packages/ai/src/schema/errors.ts

@@ -106,6 +106,13 @@ export class TransportReason extends Schema.Class<TransportReason>("AI.Error.Tra
   code: Schema.optional(Schema.String),
   url: Schema.optional(Schema.String),
   http: Schema.optional(HttpContext),
+  phase: Schema.optional(
+    Schema.Literals(["prepare", "queue", "connect", "send", "receive", "decode", "complete", "fallback", "close"]),
+  ),
+  delivery: Schema.optional(Schema.Literals(["not-sent", "rejected", "ambiguous", "accepted"])),
+  recovery: Schema.optional(
+    Schema.Literals(["retry-connect", "retry-full", "rotate-and-retry-full", "fallback-http", "fail"]),
+  ),
 }) {}
 
 export class InvalidProviderOutputReason extends Schema.Class<InvalidProviderOutputReason>(

packages/ai/test/executor.test.ts

@@ -1,12 +1,13 @@
 import { describe, expect } from "bun:test"
-import { Effect, Layer, Ref, Stream } from "effect"
+import { Deferred, Effect, Fiber, Layer, Ref, Stream } from "effect"
 import { Headers, HttpClient, HttpClientError, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
 import { LLM, AIError } from "../src/index.js"
-import { LLMClient, RequestExecutor } from "../src/route.js"
+import { LLMClient, RequestExecutor, WebSocketTransport, type WebSocketChannelExecutor } from "../src/route.js"
 import * as OpenAIChat from "../src/protocols/openai-chat.js"
-import { dynamicResponse, systemError } from "./lib/http.js"
+import * as OpenAI from "../src/providers/openai.js"
+import { dynamicResponse, fixedResponse, systemError } from "./lib/http.js"
 import { deltaChunk } from "./lib/openai-chunks.js"
-import { sseRaw } from "./lib/sse.js"
+import { sseEvents, sseRaw } from "./lib/sse.js"
 import { it } from "./lib/effect.js"
 
 const request = HttpClientRequest.post("https://provider.test/v1/chat?api_key=secret&key=secret&debug=1").pipe(
@@ -65,6 +66,7 @@ const expectAIError = (error: unknown) => {
 }
 
 const errorHttp = (error: AIError) => ("http" in error.reason ? error.reason.http : undefined)
+const largeProviderMessage = `Upstream request failed: ${"validation failed; ".repeat(1_000)}`
 
 describe("RequestExecutor", () => {
   it.effect("parses response body failures at the executor seam", () =>
@@ -75,11 +77,11 @@ describe("RequestExecutor", () => {
       expectAIError(error)
       expect(error.reason).toMatchObject({
         _tag: "Transport",
-        message: "ECONNRESET: disconnected <redacted> <redacted>",
+        message: "ECONNRESET: disconnected query-secret-123 header-secret-456",
         transport: "http",
         operation: "read",
         code: "ECONNRESET",
-        url: "https://provider.test/v1/chat?api_key=%3Credacted%3E&debug=1",
+        url: "https://provider.test/v1/chat?api_key=query-secret-123&debug=1",
       })
     }).pipe(
       Effect.provide(
@@ -152,12 +154,12 @@ describe("RequestExecutor", () => {
       expectAIError(error)
       expect(error.reason).toMatchObject({
         _tag: "Transport",
-        message: "ECONNRESET: proxy disconnected <redacted>",
-        url: "https://proxy.test/v1/chat?api_key=%3Credacted%3E",
+        message: "ECONNRESET: proxy disconnected proxy-secret",
+        url: "https://proxy.test/v1/chat?api_key=proxy-secret",
         http: {
           request: {
-            url: "https://proxy.test/v1/chat?api_key=%3Credacted%3E",
-            headers: { authorization: "<redacted>" },
+            url: "https://proxy.test/v1/chat?api_key=proxy-secret",
+            headers: { authorization: "Bearer proxy-secret" },
           },
         },
       })
@@ -217,9 +219,47 @@ describe("RequestExecutor", () => {
       expectAIError(error)
       expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
       expect("classification" in error.reason ? error.reason.classification : undefined).toBeUndefined()
+      expect(error.reason.message).toBe("Provider request failed with HTTP 400")
     }).pipe(Effect.provide(responsesLayer([new Response("invalid parameter", { status: 400 })]))),
   )
 
+  it.effect("preserves structured provider messages from large error bodies", () =>
+    Effect.gen(function* () {
+      const executor = yield* RequestExecutor.Service
+      const error = yield* executor.execute(request).pipe(Effect.flip)
+
+      expectAIError(error)
+      expect(error.reason).toMatchObject({ _tag: "InvalidRequest", message: largeProviderMessage })
+      expect(errorHttp(error)?.body).toContain(largeProviderMessage)
+      expect(errorHttp(error)?.bodyTruncated).toBeUndefined()
+    }).pipe(
+      Effect.provide(
+        responsesLayer([
+          new Response(
+            JSON.stringify({
+              model: "gpt-5.6-sol",
+              error: { type: "invalid_request", message: largeProviderMessage },
+            }),
+            { status: 400 },
+          ),
+        ]),
+      ),
+    ),
+  )
+
+  it.effect("falls back when structured provider messages are empty", () =>
+    Effect.gen(function* () {
+      const executor = yield* RequestExecutor.Service
+      const error = yield* executor.execute(request).pipe(Effect.flip)
+
+      expectAIError(error)
+      expect(error.reason).toMatchObject({
+        _tag: "InvalidRequest",
+        message: "Provider request failed with HTTP 400",
+      })
+    }).pipe(Effect.provide(responsesLayer([new Response('{"error":{"message":"  "}}', { status: 400 })]))),
+  )
+
   it.effect("classifies provider rate limits hidden behind HTTP 400", () =>
     Effect.gen(function* () {
       const classify = (body: string) =>
@@ -253,7 +293,7 @@ describe("RequestExecutor", () => {
     }),
   )
 
-  it.effect("returns redacted diagnostics for rate limits", () =>
+  it.effect("returns complete diagnostics for rate limits", () =>
     Effect.gen(function* () {
       const executor = yield* RequestExecutor.Service
       const error = yield* executor.execute(request).pipe(Effect.flip)
@@ -268,15 +308,15 @@ describe("RequestExecutor", () => {
             requestId: "req_123",
             request: {
               method: "POST",
-              url: "https://provider.test/v1/chat?api_key=%3Credacted%3E&key=%3Credacted%3E&debug=1",
-              headers: { authorization: "<redacted>", "x-safe": "visible" },
+              url: "https://provider.test/v1/chat?api_key=secret&key=secret&debug=1",
+              headers: { authorization: "Bearer secret", "x-safe": "visible" },
             },
             response: {
               status: 429,
               headers: {
                 "retry-after-ms": "0",
                 "x-request-id": "req_123",
-                "x-api-key": "<redacted>",
+                "x-api-key": "secret",
               },
             },
           },
@@ -295,14 +335,14 @@ describe("RequestExecutor", () => {
     ),
   )
 
-  it.effect("honors current redacted header names in diagnostics", () =>
+  it.effect("preserves configured header names in diagnostics", () =>
     Effect.gen(function* () {
       const executor = yield* RequestExecutor.Service
       const error = yield* executor.execute(request).pipe(Effect.flip)
 
       expectAIError(error)
-      expect(errorHttp(error)?.request.headers["x-safe"]).toBe("<redacted>")
-      expect(errorHttp(error)?.response?.headers["x-safe"]).toBe("<redacted>")
+      expect(errorHttp(error)?.request.headers["x-safe"]).toBe("visible")
+      expect(errorHttp(error)?.response?.headers["x-safe"]).toBe("response-secret")
     }).pipe(
       Effect.provide(responsesLayer([new Response("bad", { status: 400, headers: { "x-safe": "response-secret" } })])),
       Effect.provideService(Headers.CurrentRedactedNames, ["x-safe"]),
@@ -421,15 +461,15 @@ describe("RequestExecutor", () => {
     }),
   )
 
-  it.effect("truncates large authentication error bodies", () =>
+  it.effect("preserves large authentication error bodies", () =>
     Effect.gen(function* () {
       const executor = yield* RequestExecutor.Service
       const error = yield* executor.execute(request).pipe(Effect.flip)
 
       expectAIError(error)
       expect(error.reason).toMatchObject({ _tag: "Authentication" })
-      expect(errorHttp(error)?.bodyTruncated).toBe(true)
-      expect(errorHttp(error)?.body).toHaveLength(16_384)
+      expect(errorHttp(error)?.bodyTruncated).toBeUndefined()
+      expect(errorHttp(error)?.body).toHaveLength(20_000)
     }).pipe(
       Effect.provide(
         responsesLayer([
@@ -440,16 +480,15 @@ describe("RequestExecutor", () => {
     ),
   )
 
-  it.effect("redacts common secret fields in response bodies", () =>
+  it.effect("preserves response body fields", () =>
     Effect.gen(function* () {
       const executor = yield* RequestExecutor.Service
       const error = yield* executor.execute(request).pipe(Effect.flip)
 
       expectAIError(error)
-      expect(errorHttp(error)?.body).toContain('"key":"<redacted>"')
-      expect(errorHttp(error)?.body).toContain("api_key=<redacted>")
-      expect(errorHttp(error)?.body).not.toContain("body-secret")
-      expect(errorHttp(error)?.body).not.toContain("query-secret")
+      expect(errorHttp(error)?.body).toBe(
+        '{"error":{"message":"bad","key":"body-secret","detail":"api_key=query-secret"}}',
+      )
     }).pipe(
       Effect.provide(
         responsesLayer([
@@ -461,16 +500,13 @@ describe("RequestExecutor", () => {
     ),
   )
 
-  it.effect("redacts echoed request secret values in response bodies", () =>
+  it.effect("preserves echoed request values in response bodies", () =>
     Effect.gen(function* () {
       const executor = yield* RequestExecutor.Service
       const error = yield* executor.execute(secretRequest).pipe(Effect.flip)
 
       expectAIError(error)
-      expect(errorHttp(error)?.body).toContain("provider echoed <redacted>")
-      expect(errorHttp(error)?.body).toContain("authorization <redacted>")
-      expect(errorHttp(error)?.body).not.toContain("query-secret-123")
-      expect(errorHttp(error)?.body).not.toContain("header-secret-456")
+      expect(errorHttp(error)?.body).toBe("provider echoed query-secret-123 and authorization header-secret-456")
     }).pipe(
       Effect.provide(
         responsesLayer([
@@ -511,3 +547,146 @@ describe("RequestExecutor", () => {
     }),
   )
 })
+
+describe("WebSocket channel execution", () => {
+  const model = OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responses("gpt-4.1-mini")
+  const request = LLM.request({ model, prompt: "Say hello." })
+  const frames = [
+    JSON.stringify({ type: "response.output_text.delta", item_id: "msg_1", delta: "Hi" }),
+    JSON.stringify({ type: "response.completed", response: { id: "resp_1" } }),
+  ]
+
+  it.effect("runs a channel driver through the direct executor", () =>
+    Effect.gen(function* () {
+      const sent = yield* Ref.make("")
+      const closed = yield* Ref.make(false)
+      const observed = yield* Ref.make(0)
+      const webSocket = WebSocketTransport.makeDirect({
+        open: () =>
+          Effect.succeed({
+            sendText: (message) => Ref.set(sent, message),
+            messages: Stream.make("one", "done", "late"),
+            close: Ref.set(closed, true),
+          }),
+      })
+      const received = yield* Effect.scoped(
+        Effect.gen(function* () {
+          const execution = yield* webSocket.execute({
+            id: "exchange_1",
+            connect: { url: "wss://api.openai.test/v1/responses", headers: Headers.empty },
+            fallback: () => Stream.empty,
+            driver: {
+              create: () => Effect.succeed({ message: "create", mode: "full" }),
+              observe: (_create, frame) =>
+                Ref.update(observed, (value) => value + 1).pipe(
+                  Effect.as(
+                    frame === "done" ? { type: "completed" as const, frame } : { type: "frame" as const, frame },
+                  ),
+                ),
+            },
+          })
+          return yield* Stream.runCollect(execution.frames)
+        }),
+      )
+
+      expect(Array.from(received)).toEqual(["one", "done"])
+      expect(yield* Ref.get(sent)).toBe("create")
+      expect(yield* Ref.get(observed)).toBe(2)
+      expect(yield* Ref.get(closed)).toBe(true)
+    }),
+  )
+
+  it.effect("rejects a closed socket before attempting to send", () =>
+    Effect.gen(function* () {
+      class ClosedBeforeSend extends EventTarget {
+        readyState = globalThis.WebSocket.OPEN
+        sends = 0
+        send() {
+          this.sends++
+        }
+        close() {}
+      }
+      const socket = new ClosedBeforeSend()
+      const connection = yield* WebSocketTransport.fromWebSocket(
+        // oxlint-disable-next-line typescript-eslint/no-unsafe-type-assertion
+        socket as unknown as globalThis.WebSocket,
+        { url: "wss://api.openai.test/v1/responses", headers: Headers.empty },
+      )
+      socket.readyState = globalThis.WebSocket.CLOSED
+
+      const error = yield* connection.sendText("create").pipe(Effect.flip)
+
+      expect(error.reason).toMatchObject({ _tag: "Transport", phase: "send", delivery: "not-sent" })
+      expect(socket.sends).toBe(0)
+      yield* connection.close
+    }),
+  )
+
+  it.effect("uses HTTP when no per-call WebSocket executor is provided", () =>
+    Effect.gen(function* () {
+      const response = yield* LLMClient.generate(request).pipe(Effect.provide(fixedResponse(sseEvents(...frames))))
+
+      expect(response.text).toBe("Hi")
+    }),
+  )
+
+  it.effect("commits channel execution only after complete consumption", () =>
+    Effect.gen(function* () {
+      const commits = yield* Ref.make(0)
+      const executor = (input: Stream.Stream<string, AIError>): WebSocketChannelExecutor => ({
+        execute: () =>
+          Effect.succeed({
+            frames: input,
+            complete: Ref.update(commits, (value) => value + 1),
+          }),
+      })
+
+      const response = yield* LLMClient.generate(request, {
+        webSocket: executor(Stream.fromArray(frames)),
+      }).pipe(Effect.provide(fixedResponse("")))
+      expect(response.text).toBe("Hi")
+      expect(yield* Ref.get(commits)).toBe(1)
+
+      yield* LLMClient.generate(request, { webSocket: executor(Stream.make("not-json")) }).pipe(
+        Effect.provide(fixedResponse("")),
+        Effect.flip,
+      )
+      expect(yield* Ref.get(commits)).toBe(1)
+
+      yield* LLMClient.stream(request, { webSocket: executor(Stream.fromArray(frames)) }).pipe(
+        Stream.take(1),
+        Stream.runDrain,
+        Effect.provide(fixedResponse("")),
+      )
+      expect(yield* Ref.get(commits)).toBe(1)
+    }),
+  )
+
+  it.effect("does not commit interrupted channel execution", () =>
+    Effect.gen(function* () {
+      const commits = yield* Ref.make(0)
+      const started = yield* Deferred.make<void>()
+      const executor: WebSocketChannelExecutor = {
+        execute: () =>
+          Effect.succeed({
+            frames: Stream.fromEffect(
+              Deferred.succeed(started, undefined).pipe(
+                Effect.as(JSON.stringify({ type: "response.created", response: { id: "resp_1" } })),
+              ),
+            ).pipe(Stream.concat(Stream.never)),
+            complete: Ref.update(commits, (value) => value + 1),
+          }),
+      }
+      const fiber = yield* LLMClient.stream(request, { webSocket: executor }).pipe(
+        Stream.runDrain,
+        Effect.provide(fixedResponse("")),
+        Effect.forkChild({ startImmediately: true }),
+      )
+
+      yield* Deferred.await(started)
+      yield* Fiber.interrupt(fiber)
+
+      expect(yield* Ref.get(commits)).toBe(0)
+    }),
+  )
+})

packages/ai/test/exports.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, test } from "bun:test"
 import { AIError, ImageInput, LanguageModel, LLM, LLMClient, Provider } from "@opencode-ai/ai"
-import { Route, Protocol } from "@opencode-ai/ai/route"
+import { Route, Protocol, WebSocketTransport } from "@opencode-ai/ai/route"
 import { Provider as ProviderSubpath } from "@opencode-ai/ai/provider"
 import {
   CloudflareAIGateway,
@@ -16,6 +16,7 @@ import {
   OpenAICompatibleResponses,
   OpenAIResponses,
   OpenResponses,
+  OpenResponsesChannel,
 } from "@opencode-ai/ai/protocols"
 import * as AnthropicMessages from "@opencode-ai/ai/protocols/anthropic-messages"
 import { TestLLM } from "@opencode-ai/ai/testing"
@@ -36,6 +37,7 @@ describe("public exports", () => {
   test("route barrel exposes route-authoring APIs", () => {
     expect(Route.make).toBeFunction()
     expect(Protocol.make).toBeFunction()
+    expect(WebSocketTransport.makeDirect).toBeFunction()
   })
 
   test("provider barrels expose user-facing facades", async () => {
@@ -43,7 +45,6 @@ describe("public exports", () => {
 
     expect(OpenAI.model).toBeFunction()
     expect(OpenAI.provider.responses).toBe(OpenAI.responses)
-    expect(OpenAI.provider.responsesWebSocket).toBe(OpenAI.responsesWebSocket)
     expect(OpenAI.configure({ apiKey: "fixture" }).responses).toBeFunction()
     expect(OpenAICompatible.deepseek.model).toBeFunction()
     expect(
@@ -65,10 +66,10 @@ describe("public exports", () => {
     expect(OpenAIChat.route.id).toBe("openai-chat")
     expect(OpenAICompatibleChat.route.id).toBe("openai-compatible-chat")
     expect(OpenResponses.protocol.id).toBe("open-responses")
+    expect(OpenResponsesChannel.transport).toBeFunction()
     expect(OpenAICompatibleResponses.route.id).toBe("openai-compatible-responses")
     expect(OpenAICompatibleResponses.route.protocol).toBe("open-responses")
     expect(OpenAIResponses.route.id).toBe("openai-responses")
-    expect(OpenAIResponses.webSocketRoute.id).toBe("openai-responses-websocket")
     expect(AnthropicMessages.route.id).toBe("anthropic-messages")
   })
 })

packages/ai/test/lib/http.ts

@@ -1,9 +1,8 @@
 import { Effect, Layer, Ref } from "effect"
 import { HttpClient, HttpClientError, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
-import { LLMClient, RequestExecutor, WebSocketExecutor } from "../../src/route.js"
+import { LLMClient, RequestExecutor } from "../../src/route.js"
 import type { Service as LLMClientService } from "../../src/route/client.js"
 import type { Service as RequestExecutorService } from "../../src/route/executor.js"
-import type { Service as WebSocketExecutorService } from "../../src/route/transport/websocket.js"
 
 export type HandlerInput = {
   readonly request: HttpClientRequest.HttpClientRequest
@@ -34,7 +33,7 @@ const handlerLayer = (handler: Handler): Layer.Layer<HttpClient.HttpClient> =>
     ),
   )
 
-export type RuntimeEnv = RequestExecutorService | WebSocketExecutorService | LLMClientService
+export type RuntimeEnv = RequestExecutorService | LLMClientService
 
 export interface SystemError extends Error {
   readonly code: string
@@ -44,9 +43,8 @@ export const systemError = (code: string, message: string): SystemError => Objec
 
 export const runtimeLayer = (layer: Layer.Layer<HttpClient.HttpClient>): Layer.Layer<RuntimeEnv> => {
   const requestExecutorLayer = RequestExecutor.layer.pipe(Layer.provide(layer))
-  const deps = Layer.mergeAll(requestExecutorLayer, WebSocketExecutor.layer)
-  const llmClientLayer = LLMClient.layer.pipe(Layer.provide(deps))
-  return Layer.mergeAll(deps, llmClientLayer)
+  const llmClientLayer = LLMClient.layer.pipe(Layer.provide(requestExecutorLayer))
+  return Layer.mergeAll(requestExecutorLayer, llmClientLayer)
 }
 
 const SSE_HEADERS = { "content-type": "text/event-stream" } as const

packages/ai/test/provider-error.test.ts

@@ -69,10 +69,10 @@ describe("provider error classification", () => {
 
   test("classifies V1 overloaded provider codes", () => {
     expect(
-      ['{"code":"resource_exhausted"}', '{"code":"service_unavailable"}'].map(
+      ['{"code":"resource_exhausted"}', '{"code":"service_unavailable"}', '{"code":"slow_down"}'].map(
         (message) => classifyProviderFailure({ message })._tag,
       ),
-    ).toEqual(["ProviderInternal", "ProviderInternal"])
+    ).toEqual(["ProviderInternal", "ProviderInternal", "ProviderInternal"])
   })
 
   test("classifies transient client statuses as provider internal", () => {

packages/ai/test/provider-options/openai.types.ts

@@ -1,13 +1,18 @@
 import { LLM } from "../../src/index.js"
 import { OpenAI } from "../../src/providers.js"
 
-const model = OpenAI.responses("gpt-5")
+const selected = OpenAI.responses("gpt-5")
 
-LLM.request({ model, prompt: "Hello", providerOptions: { openai: { reasoningEffort: "high" } } })
+LLM.request({ model: selected, prompt: "Hello", providerOptions: { openai: { reasoningEffort: "high" } } })
 
 LLM.request({
-  model,
+  model: selected,
   prompt: "Hello",
   // @ts-expect-error OpenAI reasoning effort must be a string.
   providerOptions: { openai: { reasoningEffort: 1 } },
 })
+
+OpenAI.configure({
+  // @ts-expect-error Transport is execution policy, not provider configuration.
+  transport: "websocket",
+})

packages/ai/test/provider-package.test.ts

@@ -80,11 +80,6 @@ describe("provider package entrypoints", () => {
     expect(selected.route.defaults.limits).toEqual({ context: 200_000, output: 64_000 })
   })
 
-  test("selects transport without changing the semantic API", () => {
-    expect(model("gpt-5", { apiKey: "fixture" }).route.id).toBe("openai-responses")
-    expect(model("gpt-5", { apiKey: "fixture", transport: "websocket" }).route.id).toBe("openai-responses-websocket")
-  })
-
   test("maps OpenAI-compatible Responses settings onto the executable model", async () => {
     const OpenAICompatibleResponses = await import("@opencode-ai/ai/providers/openai-compatible/responses")
     const selected = OpenAICompatibleResponses.model("custom-model", {

packages/ai/test/provider/anthropic-messages.recorded.test.ts

@@ -39,7 +39,7 @@ describe("Anthropic Messages sad-path recorded", () => {
 
       expect(error).toBeInstanceOf(AIError)
       expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
-      expect(error.message).toContain("HTTP 400")
+      expect(error.reason.message).toContain("`tool_use` ids were found without `tool_result` blocks")
     }),
   )
 })

packages/ai/test/provider/anthropic-messages.test.ts

@@ -1098,8 +1098,7 @@ describe("Anthropic Messages route", () => {
       )
 
       expect(error).toBeInstanceOf(AIError)
-      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
-      expect(error.message).toContain("HTTP 400")
+      expect(error.reason).toMatchObject({ _tag: "InvalidRequest", message: "Bad request" })
     }),
   )
 

packages/ai/test/provider/openai-chat.test.ts

@@ -1275,8 +1275,7 @@ describe("OpenAI Chat route", () => {
       )
 
       expect(error).toBeInstanceOf(AIError)
-      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
-      expect(error.message).toContain("HTTP 400")
+      expect(error.reason).toMatchObject({ _tag: "InvalidRequest", message: "Bad request" })
     }),
   )
 

packages/ai/test/provider/openai-responses.test.ts

@@ -1,9 +1,10 @@
 import { describe, expect } from "bun:test"
-import { ConfigProvider, Effect, Layer, Stream } from "effect"
+import { ConfigProvider, Effect, Layer, Ref, Stream } from "effect"
 import { Headers, HttpClientRequest } from "effect/unstable/http"
 import {
   LLM,
   AIError,
+  HttpOptions,
   LLMEvent,
   LLMRequest,
   Message,
@@ -11,14 +12,23 @@ import {
   ToolCallPart,
   ToolDefinition,
   ToolResultPart,
+  TransportReason,
   Usage,
 } from "../../src/index.js"
-import { Auth, LLMClient, RequestExecutor, WebSocketExecutor } from "../../src/route.js"
+import {
+  Auth,
+  LLMClient,
+  RequestExecutor,
+  WebSocketTransport,
+  type ChannelObservation,
+  type WebSocketChannelDriver,
+} from "../../src/route.js"
 import { compileRequest } from "../../src/route/client.js"
 import * as Azure from "../../src/providers/azure.js"
 import * as OpenAI from "../../src/providers/openai.js"
 import * as XAI from "../../src/providers/xai.js"
 import * as OpenAIResponses from "../../src/protocols/openai-responses.js"
+import { OpenAIResponsesChannel } from "../../src/protocols/openai-responses-channel.js"
 import * as ProviderShared from "../../src/protocols/shared.js"
 import { continuationRequest, nativeOpenAIResponsesContinuation } from "../continuation-scenarios.js"
 import { it } from "../lib/effect.js"
@@ -31,6 +41,47 @@ const model = OpenAIResponses.route
 
 const xaiModel = XAI.configure({ apiKey: "test", baseURL: "https://api.x.ai/v1" }).responses("grok-4.5")
 
+const baseChannelDriver = (message: string): WebSocketChannelDriver => ({
+  create: () => Effect.succeed({ message, mode: "full" }),
+  observe: (_create, frame): Effect.Effect<ChannelObservation, AIError> => {
+    const event = ProviderShared.decodeJson(frame)
+    if (!ProviderShared.isRecord(event)) return Effect.die("Expected event")
+    if (event.type === "response.completed") return Effect.succeed({ type: "completed", frame })
+    if (event.type === "response.incomplete") return Effect.succeed({ type: "incomplete", frame })
+    if (event.type === "error" || event.type === "response.failed")
+      return Effect.succeed({
+        type: "provider-failure",
+        error: new AIError({
+          module: "test",
+          method: "stream",
+          reason: new TransportReason({
+            message: "provider rejected request",
+            transport: "websocket",
+            operation: "read",
+            phase: "receive",
+          }),
+        }),
+      })
+    return Effect.succeed({ type: "frame", frame })
+  },
+})
+
+const continuationDriver = (request: Readonly<Record<string, unknown>>) => {
+  const message = ProviderShared.encodeJson(request)
+  return OpenAIResponsesChannel.driver({
+    id: "openai-responses",
+    name: "OpenAI Responses",
+    request,
+    message,
+    base: baseChannelDriver(message),
+  })
+}
+
+const checkpoint = (observation: ChannelObservation) => {
+  if (observation.type !== "completed" || !observation.checkpoint) throw new Error("Expected checkpoint")
+  return observation.checkpoint
+}
+
 const request = LLM.request({
   id: "req_1",
   model,
@@ -216,19 +267,19 @@ describe("OpenAI Responses route", () => {
     }),
   )
 
-  it.effect("prepares OpenAI Responses WebSocket target", () =>
+  it.effect("prepares one OpenAI Responses route for either transport", () =>
     Effect.gen(function* () {
       const prepared = yield* compileRequest(
         LLMRequest.update(request, {
-          model: OpenAIResponses.webSocketRoute
+          model: OpenAIResponses.route
             .with({ endpoint: { baseURL: "https://api.openai.test/v1/" }, auth: Auth.bearer("test") })
             .model({ id: "gpt-4.1-mini" }),
         }),
       )
 
-      expect(prepared.route).toBe("openai-responses-websocket")
+      expect(prepared.route).toBe("openai-responses")
       expect(prepared.protocol).toBe("openai-responses")
-      expect(prepared.metadata).toEqual({ transport: "websocket-json" })
+      expect(prepared.metadata).toEqual({ transport: "http-json" })
       expect(prepared.body).toMatchObject({ model: "gpt-4.1-mini", store: false, stream: true })
     }),
   )
@@ -236,47 +287,60 @@ describe("OpenAI Responses route", () => {
   it.effect("streams OpenAI Responses over WebSocket", () =>
     Effect.gen(function* () {
       const sent: string[] = []
-      const opened: Array<{ readonly url: string; readonly authorization: string | undefined }> = []
+      const opened: Array<{
+        readonly url: string
+        readonly authorization: string | undefined
+        readonly protocol: string | undefined
+      }> = []
       let closed = false
-      const deps = Layer.mergeAll(
-        Layer.succeed(
-          RequestExecutor.Service,
-          RequestExecutor.Service.of({
-            execute: () => Effect.die("unexpected HTTP request"),
-          }),
-        ),
-        Layer.succeed(
-          WebSocketExecutor.Service,
-          WebSocketExecutor.Service.of({
-            open: (input) =>
-              Effect.succeed({
-                sendText: (message) =>
-                  Effect.sync(() => {
-                    opened.push({ url: input.url, authorization: input.headers.authorization })
-                    sent.push(message)
-                  }),
-                messages: Stream.fromArray([
-                  ProviderShared.encodeJson({ type: "response.output_text.delta", item_id: "msg_1", delta: "Hi" }),
-                  ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_ws" } }),
-                ]),
-                close: Effect.sync(() => {
-                  closed = true
-                }),
-              }),
-          }),
-        ),
+      const deps = Layer.succeed(
+        RequestExecutor.Service,
+        RequestExecutor.Service.of({
+          execute: () => Effect.die("unexpected HTTP request"),
+        }),
       )
+      const webSocket = WebSocketTransport.makeDirect({
+        open: (input) =>
+          Effect.succeed({
+            sendText: (message) =>
+              Effect.sync(() => {
+                opened.push({
+                  url: input.url,
+                  authorization: input.headers.authorization,
+                  protocol: input.headers["openai-beta"],
+                })
+                sent.push(message)
+              }),
+            messages: Stream.fromArray([
+              ProviderShared.encodeJson({ type: "response.created", response: { id: "resp_ws" } }),
+              ProviderShared.encodeJson({ type: "response.output_text.delta", item_id: "msg_1", delta: "Hi" }),
+              ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_ws" } }),
+            ]),
+            close: Effect.sync(() => {
+              closed = true
+            }),
+          }),
+      })
       const response = yield* LLMClient.generate(
         LLM.request({
-          model: OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responsesWebSocket(
-            "gpt-4.1-mini",
-          ),
+          model: OpenAI.configure({
+            baseURL: "https://api.openai.test/v1/",
+            apiKey: "test",
+            headers: { "openai-beta": "custom-protocol" },
+          }).responses("gpt-4.1-mini"),
           prompt: "Say hello.",
         }),
+        { webSocket },
       ).pipe(Effect.provide(LLMClient.layer.pipe(Layer.provide(deps))))
 
       expect(response.text).toBe("Hi")
-      expect(opened).toEqual([{ url: "wss://api.openai.test/v1/responses", authorization: "Bearer test" }])
+      expect(opened).toEqual([
+        {
+          url: "wss://api.openai.test/v1/responses",
+          authorization: "Bearer test",
+          protocol: "custom-protocol",
+        },
+      ])
       expect(closed).toBe(true)
       expect(sent).toHaveLength(1)
       expect(JSON.parse(sent[0])).toEqual({
@@ -288,15 +352,524 @@ describe("OpenAI Responses route", () => {
     }),
   )
 
+  it.effect("rejects out-of-order and mismatched WebSocket response events", () =>
+    Effect.gen(function* () {
+      const streams = [
+        Stream.fromArray([
+          ProviderShared.encodeJson({ type: "response.output_text.delta", item_id: "late", delta: "Late" }),
+          ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_old" } }),
+        ]),
+        Stream.fromArray([
+          ProviderShared.encodeJson({ type: "response.created", response: { id: "resp_new" } }),
+          ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_old" } }),
+        ]),
+      ]
+      const webSocket = WebSocketTransport.makeDirect({
+        open: () =>
+          Effect.succeed({
+            sendText: () => Effect.void,
+            messages: streams.shift() ?? Stream.die("unexpected WebSocket open"),
+            close: Effect.void,
+          }),
+      })
+      const deps = Layer.succeed(
+        RequestExecutor.Service,
+        RequestExecutor.Service.of({ execute: () => Effect.die("unexpected HTTP request") }),
+      )
+      const model = OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responses(
+        "gpt-4.1-mini",
+      )
+
+      const errors = yield* Effect.forEach(["late", "mismatch"], (prompt) =>
+        LLMClient.generate(LLM.request({ model, prompt }), { webSocket }).pipe(
+          Effect.provide(LLMClient.layer.pipe(Layer.provide(deps))),
+          Effect.flip,
+        ),
+      )
+
+      expect(errors.map((error) => error.reason._tag)).toEqual(["InvalidProviderOutput", "InvalidProviderOutput"])
+      expect(errors[0]?.message).toContain("before response.created")
+      expect(errors[1]?.message).toContain("response ID changed")
+    }),
+  )
+
+  it.effect("continues a tool call with only the new tool output", () =>
+    Effect.gen(function* () {
+      const firstRequest = {
+        type: "response.create",
+        model: "gpt-5.2",
+        store: false,
+        input: [{ role: "user", content: [{ type: "input_text", text: "Weather?" }] }],
+      }
+      const first = continuationDriver(firstRequest)
+      const firstCreate = yield* first.create(undefined)
+      yield* first.observe(
+        firstCreate,
+        ProviderShared.encodeJson({
+          type: "response.output_item.done",
+          item: {
+            type: "function_call",
+            id: "fc_1",
+            status: "completed",
+            call_id: "call_1",
+            name: "weather",
+            arguments: '{ "city": "Paris" }',
+          },
+        }),
+      )
+      const saved = checkpoint(
+        yield* first.observe(
+          firstCreate,
+          ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_1" } }),
+        ),
+      )
+      const second = continuationDriver({
+        ...firstRequest,
+        input: [
+          ...firstRequest.input,
+          { type: "function_call", call_id: "call_1", name: "weather", arguments: '{"city":"Paris"}' },
+          { type: "function_call_output", call_id: "call_1", output: '{"temperature":22}' },
+        ],
+      })
+
+      const create = yield* second.create(saved)
+
+      expect(create.mode).toBe("incremental")
+      expect(ProviderShared.decodeJson(create.message)).toMatchObject({
+        previous_response_id: "resp_1",
+        input: [{ type: "function_call_output", call_id: "call_1", output: '{"temperature":22}' }],
+      })
+    }),
+  )
+
+  it.effect("continues a promoted steer after the completed assistant output", () =>
+    Effect.gen(function* () {
+      const firstInput = [{ role: "user", content: [{ type: "input_text", text: "First" }] }]
+      const first = continuationDriver({ type: "response.create", model: "gpt-5.2", store: false, input: firstInput })
+      const create = yield* first.create(undefined)
+      yield* first.observe(
+        create,
+        ProviderShared.encodeJson({
+          type: "response.output_item.done",
+          item: {
+            type: "message",
+            id: "msg_1",
+            status: "completed",
+            role: "assistant",
+            content: [{ type: "output_text", text: "Hello" }],
+          },
+        }),
+      )
+      const saved = checkpoint(
+        yield* first.observe(
+          create,
+          ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_1" } }),
+        ),
+      )
+      const steer = { role: "user", content: [{ type: "input_text", text: "Actually, be brief" }] }
+      const next = continuationDriver({
+        type: "response.create",
+        model: "gpt-5.2",
+        store: false,
+        input: [...firstInput, { role: "assistant", content: [{ type: "output_text", text: "Hello" }] }, steer],
+      })
+
+      const continued = yield* next.create(saved)
+
+      expect(continued.mode).toBe("incremental")
+      expect(ProviderShared.decodeJson(continued.message)).toMatchObject({
+        previous_response_id: "resp_1",
+        input: [steer],
+      })
+    }),
+  )
+
+  it.effect("continues store-false reasoning without replaying the output-only item ID", () =>
+    Effect.gen(function* () {
+      const firstInput = [{ role: "user", content: [{ type: "input_text", text: "Think" }] }]
+      const request = { type: "response.create", model: "gpt-5.2", store: false, input: firstInput }
+      const first = continuationDriver(request)
+      const create = yield* first.create(undefined)
+      yield* first.observe(
+        create,
+        ProviderShared.encodeJson({
+          type: "response.output_item.done",
+          item: {
+            type: "reasoning",
+            id: "rs_1",
+            summary: [{ type: "summary_text", text: "Thought" }],
+            encrypted_content: "encrypted",
+          },
+        }),
+      )
+      const saved = checkpoint(
+        yield* first.observe(
+          create,
+          ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_1" } }),
+        ),
+      )
+      const next = continuationDriver({
+        ...request,
+        input: [
+          ...firstInput,
+          {
+            type: "reasoning",
+            summary: [{ type: "summary_text", text: "Thought" }],
+            encrypted_content: "encrypted",
+          },
+          { role: "user", content: [{ type: "input_text", text: "Continue" }] },
+        ],
+      })
+
+      const continued = yield* next.create(saved)
+
+      expect(continued.mode).toBe("incremental")
+      expect(ProviderShared.decodeJson(continued.message)).toMatchObject({
+        previous_response_id: "resp_1",
+        input: [{ role: "user", content: [{ type: "input_text", text: "Continue" }] }],
+      })
+    }),
+  )
+
+  it.effect("uses a full request when any non-input invariant changes", () =>
+    Effect.gen(function* () {
+      const request = {
+        type: "response.create",
+        model: "gpt-5.2",
+        store: false,
+        metadata: { source: "one" },
+        input: [{ role: "user", content: [{ type: "input_text", text: "First" }] }],
+      }
+      const first = continuationDriver(request)
+      const create = yield* first.create(undefined)
+      const saved = checkpoint(
+        yield* first.observe(
+          create,
+          ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_1" } }),
+        ),
+      )
+      const appended = [...request.input, { role: "user", content: [{ type: "input_text", text: "Second" }] }]
+      const changes = [
+        { ...request, model: "gpt-5.3", input: appended },
+        { ...request, instructions: "Changed", input: appended },
+        { ...request, tools: [{ type: "function", name: "other" }], input: appended },
+        { ...request, temperature: 0.5, input: appended },
+        { ...request, metadata: { source: "two" }, input: appended },
+        {
+          ...request,
+          input: [{ role: "user", content: [{ type: "input_text", text: "Rewritten history" }] }, appended[1]],
+        },
+      ]
+
+      const creates = yield* Effect.forEach(changes, (changed) => continuationDriver(changed).create(saved))
+
+      expect(creates.map((item) => item.mode)).toEqual(changes.map(() => "full"))
+      expect(
+        creates
+          .map((item) => ProviderShared.decodeJson(item.message))
+          .every((item) => ProviderShared.isRecord(item) && !("previous_response_id" in item)),
+      ).toBe(true)
+    }),
+  )
+
+  it.effect("stages no checkpoint for incomplete or ID-less completion", () =>
+    Effect.gen(function* () {
+      const driver = continuationDriver({ type: "response.create", model: "gpt-5.2", input: [] })
+      const create = yield* driver.create(undefined)
+
+      const completed = yield* driver.observe(
+        create,
+        ProviderShared.encodeJson({ type: "response.completed", response: {} }),
+      )
+      expect(completed).toMatchObject({ type: "completed" })
+      expect(completed).not.toHaveProperty("checkpoint")
+      expect(
+        yield* driver.observe(create, ProviderShared.encodeJson({ type: "response.incomplete", response: {} })),
+      ).toMatchObject({ type: "incomplete" })
+    }),
+  )
+
+  it.effect("classifies explicit continuation rejection for runner-owned recovery", () =>
+    Effect.gen(function* () {
+      const driver = continuationDriver({ type: "response.create", model: "gpt-5.2", input: [] })
+      const create = yield* driver.create(undefined)
+      const missing = yield* driver.observe(
+        create,
+        ProviderShared.encodeJson({
+          type: "error",
+          error: { code: "previous_response_not_found", message: "Missing response" },
+        }),
+      )
+      const limit = yield* driver.observe(
+        create,
+        ProviderShared.encodeJson({
+          type: "error",
+          error: { code: "websocket_connection_limit_reached", message: "Rotate" },
+        }),
+      )
+
+      expect(missing).toMatchObject({
+        type: "rejected",
+        recovery: "retry-full",
+        error: { reason: { _tag: "Transport", delivery: "rejected", recovery: "retry-full" } },
+      })
+      expect(limit).toMatchObject({
+        type: "rejected",
+        recovery: "rotate-and-retry-full",
+        error: {
+          reason: { _tag: "Transport", delivery: "rejected", recovery: "rotate-and-retry-full" },
+        },
+      })
+    }),
+  )
+
+  it.effect("builds WebSocket and HTTP fallback from the same final request", () =>
+    Effect.gen(function* () {
+      const attempts = yield* Ref.make(0)
+      const message = yield* Ref.make("")
+      const body = yield* Ref.make("")
+      const response = yield* LLMClient.generate(
+        LLM.request({
+          model: OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responses("gpt-4.1-mini"),
+          prompt: "Say hello.",
+          http: {
+            body: {
+              model: "overlaid-model",
+              metadata: { source: "overlay" },
+              stream_options: { include_usage: true },
+              background: true,
+            },
+            headers: { "x-request": "request" },
+            query: { mode: "test" },
+          },
+        }),
+        {
+          webSocket: {
+            execute: (exchange) =>
+              Effect.gen(function* () {
+                expect(exchange.connect.rotateAfterMs).toBe(55 * 60 * 1000)
+                expect(exchange.connect.headers["openai-beta"]).toBe("responses_websockets=2026-02-06")
+                expect(exchange.connect.headers["content-length"]).toBeUndefined()
+                yield* exchange.driver
+                  .create(undefined)
+                  .pipe(Effect.flatMap((create) => Ref.set(message, create.message)))
+                return { frames: exchange.fallback(), complete: Effect.void }
+              }),
+          },
+        },
+      ).pipe(
+        Effect.provide(
+          dynamicResponse((input) =>
+            Effect.gen(function* () {
+              yield* Ref.update(attempts, (value) => value + 1)
+              yield* Ref.set(body, input.text)
+              expect(input.request.url).toBe("https://api.openai.test/v1/responses?mode=test")
+              expect(input.request.headers.authorization).toBe("Bearer test")
+              expect(input.request.headers["x-request"]).toBe("request")
+              return input.respond(sseEvents({ type: "response.completed", response: {} }), {
+                headers: { "content-type": "text/event-stream" },
+              })
+            }),
+          ),
+        ),
+      )
+
+      const httpBody = JSON.parse(yield* Ref.get(body))
+      const { stream: _stream, stream_options: _streamOptions, background: _background, ...shared } = httpBody
+      expect(response.finishReason?.normalized).toBe("stop")
+      expect(yield* Ref.get(attempts)).toBe(1)
+      expect(JSON.parse(yield* Ref.get(message))).toEqual({ type: "response.create", ...shared })
+      expect(httpBody).toMatchObject({
+        model: "overlaid-model",
+        metadata: { source: "overlay" },
+        stream: true,
+        stream_options: { include_usage: true },
+        background: true,
+      })
+    }),
+  )
+
+  it.effect("uses exactly one HTTP request when no WebSocket executor is supplied", () =>
+    Effect.gen(function* () {
+      const attempts = yield* Ref.make(0)
+      yield* LLMClient.generate(
+        LLMRequest.update(request, { http: new HttpOptions({ body: { input: "raw-http-input" } }) }),
+      ).pipe(
+        Effect.provide(
+          dynamicResponse((input) =>
+            Effect.gen(function* () {
+              yield* Ref.update(attempts, (value) => value + 1)
+              expect(JSON.parse(input.text).input).toBe("raw-http-input")
+              return input.respond(sseEvents({ type: "response.completed", response: {} }), {
+                headers: { "content-type": "text/event-stream" },
+              })
+            }),
+          ),
+        ),
+      )
+
+      expect(yield* Ref.get(attempts)).toBe(1)
+    }),
+  )
+
+  it.effect("closes a direct WebSocket execution after partial consumption", () =>
+    Effect.gen(function* () {
+      const closed = yield* Ref.make(false)
+      const webSocket = WebSocketTransport.makeDirect({
+        open: () =>
+          Effect.succeed({
+            sendText: () => Effect.void,
+            messages: Stream.fromArray([
+              ProviderShared.encodeJson({ type: "response.created", response: { id: "resp_ws" } }),
+              ProviderShared.encodeJson({ type: "response.output_text.delta", item_id: "msg_1", delta: "Hi" }),
+              ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_ws" } }),
+            ]),
+            close: Ref.set(closed, true),
+          }),
+      })
+
+      yield* LLMClient.stream(
+        LLM.request({
+          model: OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responses("gpt-4.1-mini"),
+          prompt: "Say hello.",
+        }),
+        { webSocket },
+      ).pipe(
+        Stream.take(1),
+        Stream.runDrain,
+        Effect.provide(
+          LLMClient.layer.pipe(
+            Layer.provide(
+              Layer.succeed(
+                RequestExecutor.Service,
+                RequestExecutor.Service.of({ execute: () => Effect.die("unexpected HTTP request") }),
+              ),
+            ),
+          ),
+        ),
+      )
+
+      expect(yield* Ref.get(closed)).toBe(true)
+    }),
+  )
+
+  it.effect("terminates WebSocket control events without waiting for the socket to close", () =>
+    Effect.gen(function* () {
+      const events = [
+        { type: "error", error: { code: "slow_down", message: "Try later" } },
+        {
+          type: "error",
+          status_code: 429,
+          message: "Rate limited",
+          headers: { "retry-after": 1, "x-request-id": "request", cached: false, invalid: [] },
+        },
+        {
+          type: "response.failed",
+          response: { error: { code: "server_error", message: "Unavailable" } },
+        },
+        { type: "error", status: "not-a-status", message: "Malformed status" },
+      ]
+
+      const errors = yield* Effect.forEach(events, (event) =>
+        LLMClient.generate(
+          LLM.request({
+            model: OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responses(
+              "gpt-4.1-mini",
+            ),
+            prompt: "Say hello.",
+          }),
+          {
+            webSocket: WebSocketTransport.makeDirect({
+              open: () =>
+                Effect.succeed({
+                  sendText: () => Effect.void,
+                  messages: Stream.make(ProviderShared.encodeJson(event)).pipe(Stream.concat(Stream.never)),
+                  close: Effect.void,
+                }),
+            }),
+          },
+        ).pipe(
+          Effect.provide(
+            LLMClient.layer.pipe(
+              Layer.provide(
+                Layer.succeed(
+                  RequestExecutor.Service,
+                  RequestExecutor.Service.of({ execute: () => Effect.die("unexpected HTTP request") }),
+                ),
+              ),
+            ),
+          ),
+          Effect.flip,
+        ),
+      )
+
+      expect(errors.map((error) => error.reason._tag)).toEqual([
+        "ProviderInternal",
+        "RateLimit",
+        "ProviderInternal",
+        "UnknownProvider",
+      ])
+    }),
+  )
+
+  it.effect("marks post-send WebSocket failures with delivery state", () =>
+    Effect.gen(function* () {
+      const failure = new AIError({
+        module: "test",
+        method: "receive",
+        reason: new TransportReason({
+          message: "socket closed",
+          transport: "websocket",
+          operation: "read",
+          phase: "close",
+        }),
+      })
+      const streams = [
+        Stream.fail(failure),
+        Stream.make(ProviderShared.encodeJson({ type: "response.created", response: { id: "resp_observed" } })).pipe(
+          Stream.concat(Stream.fail(failure)),
+        ),
+      ]
+      const deps = Layer.succeed(
+        RequestExecutor.Service,
+        RequestExecutor.Service.of({ execute: () => Effect.die("unexpected HTTP request") }),
+      )
+      const webSocket = WebSocketTransport.makeDirect({
+        open: () =>
+          Effect.succeed({
+            sendText: () => Effect.void,
+            messages: streams.shift() ?? Stream.die("unexpected WebSocket open"),
+            close: Effect.void,
+          }),
+      })
+      const model = OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).responses(
+        "gpt-4.1-mini",
+      )
+
+      const errors = yield* Effect.forEach(["first", "second"], (prompt) =>
+        LLMClient.generate(LLM.request({ model, prompt }), { webSocket }).pipe(
+          Effect.provide(LLMClient.layer.pipe(Layer.provide(deps))),
+          Effect.flip,
+        ),
+      )
+
+      expect(errors.map((error) => error.reason)).toEqual([
+        expect.objectContaining({ _tag: "Transport", phase: "close", delivery: "ambiguous" }),
+        expect.objectContaining({ _tag: "Transport", phase: "close", delivery: "accepted" }),
+      ])
+    }),
+  )
+
   it.effect("fails immediately when WebSocket is already closed", () =>
     Effect.gen(function* () {
-      const error = yield* WebSocketExecutor.fromWebSocket(
+      const error = yield* WebSocketTransport.fromWebSocket(
         // oxlint-disable-next-line typescript-eslint/no-unsafe-type-assertion -- fromWebSocket reads readyState before touching WebSocket methods on this branch.
         { readyState: globalThis.WebSocket.CLOSED } as globalThis.WebSocket,
         { url: "wss://api.openai.test/v1/responses", headers: Headers.empty },
       ).pipe(Effect.flip)
 
       expect(error.message).toContain("closed before opening")
+      expect(error.reason).toMatchObject({ _tag: "Transport", phase: "connect", delivery: "not-sent" })
     }),
   )
 
@@ -329,7 +902,7 @@ describe("OpenAI Responses route", () => {
       yield* LLMClient.generate(
         LLMRequest.update(request, {
           model: Azure.configure({
-            baseURL: "https://opencode-test.openai.azure.com/openai/v1/",
+            baseURL: "https://opencode-test.openai.azure.com/openai/",
             apiKey: "azure-key",
             headers: { authorization: "Bearer stale" },
           }).responses("gpt-4.1-mini"),
@@ -2037,8 +2610,7 @@ describe("OpenAI Responses route", () => {
       )
 
       expect(error).toBeInstanceOf(AIError)
-      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
-      expect(error.message).toContain("HTTP 400")
+      expect(error.reason).toMatchObject({ _tag: "InvalidRequest", message: "Bad request" })
     }),
   )
 })

packages/ai/test/recorded-test.ts

@@ -2,12 +2,11 @@ import { HttpRecorder } from "@opencode-ai/http-recorder"
 import { Layer } from "effect"
 import * as path from "node:path"
 import { fileURLToPath } from "node:url"
-import { LLMClient, RequestExecutor, WebSocketExecutor } from "../src/route.js"
+import { LLMClient, RequestExecutor } from "../src/route.js"
 import { ImageClient } from "../src/image-client.js"
 import type { Service as ImageClientService } from "../src/image-client.js"
 import type { Service as LLMClientService } from "../src/route/client.js"
 import type { Service as RequestExecutorService } from "../src/route/executor.js"
-import type { Service as WebSocketExecutorService } from "../src/route/transport/websocket.js"
 import {
   recordedEffectGroup,
   type RecordedCaseOptions as RunnerCaseOptions,
@@ -17,7 +16,7 @@ import {
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
 const FIXTURES_DIR = path.resolve(__dirname, "fixtures", "recordings")
 
-type RecordedEnv = RequestExecutorService | WebSocketExecutorService | LLMClientService | ImageClientService
+type RecordedEnv = RequestExecutorService | LLMClientService | ImageClientService
 
 type RecordedTestsOptions = RecordedGroupOptions & {
   readonly options?: HttpRecorder.RecorderOptions
@@ -82,11 +81,10 @@ export const recordedTests = (options: RecordedTestsOptions) =>
           }),
         ),
       )
-      const deps = Layer.mergeAll(requestExecutor, WebSocketExecutor.layer)
       return Layer.mergeAll(
-        deps,
-        LLMClient.layer.pipe(Layer.provide(deps)),
-        ImageClient.layer.pipe(Layer.provide(deps)),
+        requestExecutor,
+        LLMClient.layer.pipe(Layer.provide(requestExecutor)),
+        ImageClient.layer.pipe(Layer.provide(requestExecutor)),
       )
     },
   })

packages/ai/test/schema.test.ts

@@ -11,6 +11,7 @@ import {
   LanguageModel,
   ModelID,
   ProviderID,
+  TransportReason,
   Usage,
 } from "../src/schema/index.js"
 import { ProviderShared } from "../src/protocols/shared.js"
@@ -108,3 +109,25 @@ test("AI errors expose the shared runtime tag", async () => {
     await Effect.runPromise(Effect.fail(error).pipe(Effect.catchTag("AI.Error", () => Effect.succeed("caught")))),
   ).toBe("caught")
 })
+
+test("transport errors serialize execution facts", () => {
+  const reason = new TransportReason({
+    message: "connection closed",
+    transport: "websocket",
+    operation: "read",
+    phase: "receive",
+    delivery: "ambiguous",
+    recovery: "fail",
+  })
+
+  expect(Schema.encodeSync(TransportReason)(reason)).toEqual({
+    _tag: "Transport",
+    message: "connection closed",
+    transport: "websocket",
+    operation: "read",
+    phase: "receive",
+    delivery: "ambiguous",
+    recovery: "fail",
+  })
+  expect(Schema.decodeUnknownSync(TransportReason)(Schema.encodeSync(TransportReason)(reason))).toEqual(reason)
+})

packages/app/e2e/utils/mock-server.ts

@@ -278,7 +278,7 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     }
     if (path === "/api/project/current")
       return json(route, { id: (config.project as { id?: string }).id, directory: config.directory })
-    const worktree = path.match(/^\/api\/experimental\/project\/([^/]+)\/worktree$/)?.[1]
+    const worktree = path.match(/^\/api\/worktree\/([^/]+)$/)?.[1]
     if (worktree && route.request().method() === "GET")
       return json(route, [
         { directory: config.directory },
@@ -294,7 +294,7 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     }
     if (worktree && route.request().method() === "DELETE")
       return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
-    if (/^\/api\/experimental\/project\/[^/]+\/worktree\/refresh$/.test(path))
+    if (/^\/api\/worktree\/[^/]+\/refresh$/.test(path))
       return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
     if (path === "/api/permission/request")
       return json(route, {

packages/app/src/context/global-sync/event-reducer.ts

@@ -2,12 +2,7 @@ import { Binary } from "@opencode-ai/core/util/binary"
 import { Worktree } from "@opencode-ai/schema/worktree"
 import { produce, reconcile, type SetStoreFunction, type Store } from "solid-js/store"
 import type { Message, Part, Project, Todo } from "@/types"
-import type {
-  FileDiffInfo,
-  PermissionRequest,
-  SessionInfo,
-  SessionStatus,
-} from "@opencode-ai/client/promise"
+import type { FileDiffInfo, PermissionRequest, SessionInfo, SessionStatus } from "@opencode-ai/client/promise"
 import type { State, VcsCache } from "./types"
 import { trimSessions } from "./session-trim"
 import { dropSessionCaches } from "./session-cache"

packages/app/src/pages/new-session/new-session-workspace-controller.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, test } from "bun:test"
 import {
   normalizeNewSessionWorktree,
   resolveNewSessionBranch,
+  resolveNewSessionGit,
   resolveNewSessionWorktree,
 } from "./new-session-workspace-controller"
 
@@ -47,4 +48,10 @@ describe("new session workspace selection", () => {
     )
     expect(resolveNewSessionBranch({ worktree: "/missing", local: "dev", worktreeBranch: branch })).toBe("dev")
   })
+
+  test("uses location VCS state when the project inventory is stale", () => {
+    expect(resolveNewSessionGit({ branch: "dev" })).toBe(true)
+    expect(resolveNewSessionGit({ projectVcs: "git" })).toBe(true)
+    expect(resolveNewSessionGit({})).toBe(false)
+  })
 })

packages/app/src/pages/new-session/new-session-workspace-controller.ts

@@ -39,6 +39,10 @@ export function resolveNewSessionBranch(input: {
   return input.worktreeBranch(input.worktree) ?? input.local
 }
 
+export function resolveNewSessionGit(input: { projectVcs?: string; branch?: string }) {
+  return input.projectVcs === "git" || input.branch !== undefined
+}
+
 export function createNewSessionWorkspaceController(input: {
   selected: () => string | undefined
   setSelected: (worktree: string | undefined) => void
@@ -49,7 +53,10 @@ export function createNewSessionWorkspaceController(input: {
   const serverSDK = useServerSDK()
   const serverSync = useServerSync()
   const settings = useSettings()
-  const visible = createMemo(() => sync().project?.vcs === "git")
+  const localVcs = createMemo(() => serverSync.child(sdk().directory)[0].vcs)
+  const visible = createMemo(() =>
+    resolveNewSessionGit({ projectVcs: sync().project?.vcs, branch: localVcs()?.branch }),
+  )
   const selected = createMemo(() => {
     const project = sync().project
     const worktree = input.selected()
@@ -110,7 +117,7 @@ export function createNewSessionWorkspaceController(input: {
         const project = sync().project
         return project ? workspaceDirectories(project) : []
       },
-      git: () => sync().project?.vcs === "git",
+      git: visible,
       openAll: input.onViewAll,
     },
     bar: {

packages/cli/script/app-assets.ts

@@ -1,7 +1,7 @@
 import { $ } from "bun"
-import { readdir } from "node:fs/promises"
 import path from "node:path"
 import { brotliCompressSync, constants } from "node:zlib"
+import { collectFiles } from "./files"
 
 export async function buildAppArchive(channel: string, options?: { skipBuild?: boolean }) {
   if (options?.skipBuild) return compress({})
@@ -9,8 +9,10 @@ export async function buildAppArchive(channel: string, options?: { skipBuild?: b
   await $`bun run build`.cwd(root).env({ ...process.env, OPENCODE_CHANNEL: channel })
   const assets = Object.fromEntries(
     await Promise.all(
-      (await files(path.join(root, "dist")))
+      (await collectFiles(path.join(root, "dist")))
+        .map((key) => key.replaceAll(path.sep, "/"))
         .filter((key) => !key.endsWith(".map"))
+        .toSorted()
         .map(async (key) => {
           const source = path.join(root, "dist", key)
           const body = Buffer.from(await Bun.file(source).arrayBuffer())
@@ -31,16 +33,3 @@ function compress(assets: object) {
 function isText(key: string) {
   return key === "_headers" || /\.(?:css|html|js|json|svg|txt|webmanifest|xml)$/.test(key)
 }
-
-async function files(root: string, current = root): Promise<string[]> {
-  return (
-    await Promise.all(
-      (await readdir(current, { withFileTypes: true })).map((entry) => {
-        const target = path.join(current, entry.name)
-        return entry.isDirectory() ? files(root, target) : [path.relative(root, target).replaceAll(path.sep, "/")]
-      }),
-    )
-  )
-    .flat()
-    .toSorted()
-}

packages/cli/script/build-node.ts

@@ -12,6 +12,7 @@ import { collectNodeAssets, copyNodeAssets, hashNodeAssets, seaAssetMap } from "
 import { mainConfig } from "../vite.node.config"
 import { nodeExecArgv, nodeTarget, type NodeTarget } from "../src/node/target"
 import { buildAppArchive } from "./app-assets"
+import { verifyArtifact } from "./verify-artifact"
 
 const NODE_VERSION = "26.4.0"
 const dir = path.resolve(import.meta.dirname, "..")
@@ -91,6 +92,7 @@ for (const target of targets) {
   await copyNodeAssets(assets)
   await build(mainConfig(input))
   await assertTextImportsInlined("dist-node/opencode.mjs")
+  if (bundleOnly) await verifyArtifact("dist-node/opencode.mjs")
 
   const host = target.platform === process.platform && target.arch === process.arch
   if (host) {
@@ -139,6 +141,7 @@ for (const target of targets) {
       2,
     )}\n`,
   )
+  await verifyArtifact(path.join(outdir, name))
   if (host) await smoke(output)
 }
 

packages/cli/script/build.ts

@@ -8,6 +8,7 @@ import { createSolidTransformPlugin } from "@opentui/solid/bun-plugin"
 import type { BunPlugin } from "bun"
 import pkg from "../package.json"
 import { buildAppArchive } from "./app-assets"
+import { verifyArtifact, verifySimulationGraph } from "./verify-artifact"
 
 const dir = path.resolve(import.meta.dirname, "..")
 const binary = "opencode2"
@@ -76,6 +77,16 @@ const appAssetsPlugin: BunPlugin = {
 }
 
 for (const item of targets) {
+  const simulationInputs = new Set<string>()
+  const simulationGraphPlugin: BunPlugin = {
+    name: "opencode-simulation-graph",
+    setup(build) {
+      build.onLoad(
+        { filter: /packages[/\\]simulation[/\\]src[/\\](frontend[/\\](simulation|server)|control-server)\.ts$/ },
+        (args) => void simulationInputs.add(args.path),
+      )
+    },
+  }
   const parcelWatcherPackage = `@parcel/watcher-${item.os}-${item.arch}${item.os === "linux" ? `-${item.abi ?? "glibc"}` : ""}`
   const parcelWatcherPlugin: BunPlugin = {
     name: "parcel-watcher-binding",
@@ -92,7 +103,7 @@ for (const item of targets) {
   const result = await Bun.build({
     entrypoints: ["./src/index.ts"],
     tsconfig: "./tsconfig.json",
-    plugins: [appAssetsPlugin, solidPlugin, parcelWatcherPlugin],
+    plugins: [appAssetsPlugin, solidPlugin, parcelWatcherPlugin, simulationGraphPlugin],
     external: ["node-gyp"],
     format: "esm",
     minify: true,
@@ -123,6 +134,7 @@ for (const item of targets) {
     for (const log of result.logs) console.error(log)
     process.exit(1)
   }
+  verifySimulationGraph(simulationInputs)
 
   await Bun.write(
     path.join(outdir, name, "package.json"),
@@ -139,6 +151,7 @@ for (const item of targets) {
       2,
     ),
   )
+  await verifyArtifact(path.join(outdir, name))
 }
 
 function targetName(item: (typeof allTargets)[number]) {

packages/cli/script/files.ts

@@ -0,0 +1,13 @@
+import { readdir } from "node:fs/promises"
+import path from "node:path"
+
+export async function collectFiles(root: string, current = root): Promise<string[]> {
+  return (
+    await Promise.all(
+      (await readdir(current, { withFileTypes: true })).map(async (entry) => {
+        const target = path.join(current, entry.name)
+        return entry.isDirectory() ? collectFiles(root, target) : [path.relative(root, target)]
+      }),
+    )
+  ).flat()
+}

packages/cli/script/node-assets.ts

@@ -1,9 +1,10 @@
 import { createHash } from "node:crypto"
-import { copyFile, mkdir, readdir, readFile, stat } from "node:fs/promises"
+import { copyFile, mkdir, readFile, stat } from "node:fs/promises"
 import path from "node:path"
 import { fileURLToPath } from "node:url"
 import { getNodeAssets } from "@opentui/core/node-assets"
 import { attentionSoundAssets, type NodeTarget, photonWasmAsset, shellParserWasmAssets } from "../src/node/target"
+import { collectFiles } from "./files"
 
 const dir = path.resolve(import.meta.dirname, "..")
 
@@ -16,17 +17,6 @@ export type NodeAsset = {
   readonly source: string
 }
 
-async function files(root: string, current = root): Promise<string[]> {
-  return (
-    await Promise.all(
-      (await readdir(current, { withFileTypes: true })).map((entry) => {
-        const target = path.join(current, entry.name)
-        return entry.isDirectory() ? files(root, target) : [path.relative(root, target)]
-      }),
-    )
-  ).flat()
-}
-
 export async function collectNodeAssets(target: NodeTarget) {
   const ptyEntry = fileURLToPath(import.meta.resolve(target.nodePtyPackage))
   const ptyRoot = path.resolve(path.dirname(ptyEntry), "..")
@@ -51,7 +41,7 @@ export async function collectNodeAssets(target: NodeTarget) {
       key,
       source: path.resolve(dir, "../ui/src/assets/audio", path.basename(key)),
     })),
-    ...(await files(ptyRoot))
+    ...(await collectFiles(ptyRoot))
       .filter((relative) => !relative.endsWith(".map") && !relative.endsWith(".pdb"))
       .map((relative) => ({
         key: `${target.nodePtyPackage}/${relative}`,
@@ -85,5 +75,7 @@ export async function copyNodeAssets(assets: readonly NodeAsset[]) {
 
 export async function seaAssetMap() {
   const root = path.join(dir, "dist-node", "assets")
-  return Object.fromEntries((await files(root)).map((key) => [key.replaceAll(path.sep, "/"), path.join(root, key)]))
+  return Object.fromEntries(
+    (await collectFiles(root)).map((key) => [key.replaceAll(path.sep, "/"), path.join(root, key)]),
+  )
 }

packages/cli/script/verify-artifact.ts

@@ -0,0 +1,65 @@
+import { stat } from "node:fs/promises"
+import path from "node:path"
+import { collectFiles } from "./files"
+
+const forbidden = [
+  "@napi-rs/canvas",
+  "@fontsource/commit-mono",
+  "@fontsource/noto-sans",
+  "SimulationPng",
+  "frontend/png",
+  "Failed to register screenshot font",
+  "commit-mono-latin-400-normal",
+  "noto-sans-symbols-symbols-400-normal",
+  "noto-sans-math-math-400-normal",
+  "CommitMono-400-Regular.otf",
+  "NotoSansSymbols.ttf",
+  "src/frontend/png.ts",
+  "skia.darwin-",
+  "skia.linux-",
+  "skia.win32-",
+]
+const overlap = Math.max(...forbidden.map((value) => value.length)) - 1
+
+export async function verifyArtifact(target: string) {
+  const files = await artifactFiles(target)
+  if (files.length === 0) throw new Error(`Artifact contains no published files: ${target}`)
+  for (const file of files) await scan(file)
+}
+
+export function verifySimulationGraph(inputs: Iterable<string>) {
+  const modules = Array.from(inputs, (input) => input.replaceAll("\\", "/"))
+  const required = [
+    "/packages/simulation/src/frontend/simulation.ts",
+    "/packages/simulation/src/frontend/server.ts",
+    "/packages/simulation/src/control-server.ts",
+  ]
+  const missing = required.filter((input) => !modules.some((module) => module.endsWith(input)))
+  if (missing.length > 0) throw new Error(`Build graph is missing simulation bridge inputs: ${missing.join(", ")}`)
+  const leaked = modules.find((module) => module.includes("/packages/simulation/src/frontend/png."))
+  if (leaked) throw new Error(`Build graph contains Drive-only rendering input: ${leaked}`)
+}
+
+async function artifactFiles(target: string): Promise<string[]> {
+  if ((await stat(target)).isFile()) return [target]
+  return (await collectFiles(target)).map((file) => path.join(target, file))
+}
+
+async function scan(file: string) {
+  let trailing = ""
+  const reader = Bun.file(file).stream().getReader()
+  while (true) {
+    const chunk = await reader.read()
+    if (chunk.done) return
+    const text = trailing + Buffer.from(chunk.value).toString("latin1")
+    const leaked = forbidden.find((marker) => text.includes(marker))
+    if (leaked) throw new Error(`Artifact file ${file} contains forbidden simulation payload: ${leaked}`)
+    trailing = text.slice(-overlap)
+  }
+}
+
+if (import.meta.main) {
+  const target = process.argv[2]
+  if (!target) throw new Error("Usage: bun run script/verify-artifact.ts <file-or-directory>")
+  await verifyArtifact(target)
+}

packages/cli/test/debug-config.test.ts

@@ -30,7 +30,6 @@ describe("debug config command", () => {
           ],
         },
       },
-      { type: "file", path: path.join(project, "opencode.json") },
     ]
     let requested: URL | undefined
     const authorization: Array<string | null> = []

packages/cli/test/drive/mini-interactive.drive.mjs

@@ -1,371 +0,0 @@
-import { Effect } from "effect"
-import { defineScript, Llm } from "opencode-drive"
-import { mkdir } from "node:fs/promises"
-import path from "node:path"
-
-export default defineScript({
-  launch: "manual",
-  config: { autoupdate: false },
-  run: ({ artifacts, llm, server }) =>
-    Effect.gen(function* () {
-      yield* Effect.promise(() => configureServicePort(artifacts))
-      yield* server.launch()
-
-      const registration = yield* Effect.promise(() => serviceRegistration(artifacts))
-      const root = path.resolve(import.meta.dir, "../../../..")
-      const preload = Bun.resolveSync("@opentui/solid/preload", path.join(root, "packages/cli"))
-      const session = `mini-stage2-${process.pid}`
-      const snapshots = path.join(artifacts, "mini-stage2")
-      const explicitDirectory = path.join(artifacts, "explicit-model")
-      yield* Effect.promise(() =>
-        Promise.all([snapshots, explicitDirectory].map((dir) => mkdir(dir, { recursive: true }))),
-      )
-      /** @param {string} directory @param {string | undefined} model */
-      const mini = (directory, model) => [
-        "env",
-        `PWD=${directory}`,
-        `OPENCODE_PASSWORD=${registration.password}`,
-        `OPENCODE_CONFIG_DIR=${path.join(artifacts, "files/.opencode")}`,
-        `OPENCODE_TEST_HOME=${artifacts}`,
-        `XDG_CACHE_HOME=${path.join(artifacts, "home/.cache")}`,
-        `XDG_CONFIG_HOME=${path.join(artifacts, "home/.config")}`,
-        `XDG_DATA_HOME=${path.join(artifacts, "logs")}`,
-        `XDG_STATE_HOME=${path.join(artifacts, "home/.local/state")}`,
-        "OPENCODE_DISABLE_AUTOUPDATE=1",
-        "OPENCODE_DIRECT_TRACE=1",
-        process.execPath,
-        "--conditions=browser",
-        `--preload=${preload}`,
-        path.join(root, "packages/cli/src/index.ts"),
-        "mini",
-        "--server",
-        registration.url,
-        ...(model ? ["--model", model] : []),
-      ]
-
-      yield* llm.queue(
-        Llm.toolCall({
-          index: 0,
-          id: "mini-shell",
-          name: "shell",
-          input: { command: "printf 'drive-mini-tool-output\\n'" },
-        }),
-        Llm.finish("tool-calls"),
-      )
-      yield* llm.queue(Llm.text("drive mini response complete", { delay: 5, chunkSize: 4 }))
-
-      const journey = Effect.gen(function* () {
-        yield* Effect.uninterruptible(
-          Effect.promise(() =>
-            tmux([
-              "new-session",
-              "-d",
-              "-s",
-              session,
-              "-x",
-              "140",
-              "-y",
-              "30",
-              "--",
-              ...mini(path.join(artifacts, "files"), undefined),
-            ]),
-          ),
-        )
-        yield* Effect.promise(() => tmux(["set-option", "-t", session, "remain-on-exit", "on"]))
-
-        const first = yield* Effect.promise(() => waitForPane(session, "OpenCode"))
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "01-first-paint.txt"), first))
-        if (first.includes("drive mini response complete"))
-          throw new Error("response rendered before prompt submission")
-
-        yield* Effect.promise(() => waitForPane(session, "Default model", 15_000))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "C-p"]))
-        yield* Effect.promise(() => waitForVisiblePane(session, "Commands"))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "-l", "model"]))
-        yield* Effect.promise(() => waitForVisiblePane(session, "Switch model"))
-        yield* Effect.promise(() => tmux(["send-keys", "-H", "-t", session, "0d"]))
-        yield* Effect.promise(() => waitForVisiblePane(session, "Select model"))
-        yield* Effect.promise(() => waitForVisiblePane(session, "Simulated Model", 15_000))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "Escape"]))
-        yield* Effect.promise(() => waitForVisiblePane(session, "Ask anything..."))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "-l", "exercise the mini frontend"]))
-        yield* Effect.sleep(100)
-        yield* Effect.promise(() => tmux(["send-keys", "-H", "-t", session, "0d"]))
-        const completed = yield* Effect.promise(() => waitForPane(session, "drive mini response complete", 20_000))
-        if (!completed.includes("drive-mini-tool-output")) throw new Error("shell tool output was not rendered")
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "02-tool-and-response.txt"), completed))
-
-        yield* Effect.sleep(500)
-        const resizeOutput = path.join(snapshots, "03-resize-output.ansi")
-        yield* Effect.promise(() => tmux(["pipe-pane", "-t", session, `cat > ${JSON.stringify(resizeOutput)}`]))
-        yield* Effect.promise(() => tmux(["resize-window", "-t", session, "-x", "72", "-y", "22"]))
-        yield* Effect.promise(() =>
-          waitForFile(
-            resizeOutput,
-            (value) => value.includes("drive mini response complete") && value.includes("drive-mini-tool-output"),
-          ),
-        )
-        yield* Effect.promise(() => tmux(["pipe-pane", "-t", session]))
-        const resized = yield* Effect.promise(() => captureVisiblePane(session))
-        if (!resized.includes("drive-mini-tool-output")) throw new Error("resize replay lost shell tool output")
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "03-resize-replay.txt"), resized))
-
-        yield* llm.queue(
-          Llm.toolCall({
-            index: 0,
-            id: "mini-question",
-            name: "question",
-            input: {
-              questions: [
-                {
-                  header: "Drive form",
-                  question: "Choose the Mini Form answer",
-                  options: [{ label: "Accepted", description: "Continue the run" }],
-                  multiple: false,
-                },
-              ],
-            },
-          }),
-          Llm.finish("tool-calls"),
-        )
-        yield* llm.queue(Llm.text("drive mini form complete"))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "-l", "exercise the form"]))
-        yield* Effect.promise(() => tmux(["send-keys", "-H", "-t", session, "0d"]))
-        yield* Effect.promise(() => waitForPane(session, "Choose the Mini Form answer", 20_000))
-        yield* Effect.promise(() => tmux(["send-keys", "-H", "-t", session, "0d"]))
-        yield* Effect.promise(() => waitForPane(session, "drive mini form complete", 20_000))
-
-        yield* llm.queue(
-          Llm.toolCall({
-            index: 0,
-            id: "mini-slow-shell",
-            name: "shell",
-            input: { command: "sleep 10" },
-          }),
-          Llm.finish("tool-calls"),
-        )
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "-l", "interrupt this turn"]))
-        yield* Effect.sleep(100)
-        yield* Effect.promise(() => tmux(["send-keys", "-H", "-t", session, "0d"]))
-        yield* Effect.promise(() => waitForPane(session, "$ sleep 10"))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "Escape"]))
-        const armed = yield* Effect.promise(() => waitForPane(session, "esc again"))
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "04-interrupt-armed.txt"), armed))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "Escape"]))
-        const interrupted = yield* Effect.promise(() => waitForPane(session, "Step interrupted", 10_000))
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "05-interrupted.txt"), interrupted))
-
-        yield* Effect.promise(async () => {
-          if (!(await paneAlive(session))) throw new Error("Mini exited while interrupting an active turn")
-        })
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "C-c"]))
-        yield* Effect.promise(() => waitForPane(session, "EXIT  Press ctrl+"))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "C-c"]))
-        yield* Effect.promise(() => waitForDeadPane(session))
-        const status = yield* Effect.promise(() => paneDeadStatus(session))
-        if (status !== 0) throw new Error(`Mini exited with status ${status}`)
-        const exited = yield* Effect.promise(() => capturePane(session))
-        if (!exited.includes("Continue") || !exited.includes("opencode mini -s"))
-          throw new Error("Mini exit splash was not rendered before teardown")
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "06-exit-teardown.txt"), exited))
-
-        yield* Effect.promise(() => tmux(["clear-history", "-t", session]))
-        yield* Effect.promise(() =>
-          tmux(["respawn-pane", "-k", "-t", session, "--", ...mini(explicitDirectory, "simulation/gpt-sim-model")]),
-        )
-        const explicitModel = yield* Effect.promise(() => waitForPane(session, "Simulated Model", 15_000))
-        yield* Effect.promise(() => Bun.write(path.join(snapshots, "07-explicit-model.txt"), explicitModel))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "C-c"]))
-        yield* Effect.promise(() => waitForPane(session, "EXIT  Press ctrl+"))
-        yield* Effect.promise(() => tmux(["send-keys", "-t", session, "C-c"]))
-        yield* Effect.promise(() => waitForDeadPane(session))
-        if ((yield* Effect.promise(() => paneDeadStatus(session))) !== 0)
-          throw new Error("Explicit-model Mini did not exit cleanly")
-
-        yield* Effect.promise(async () => {
-          for (const failure of [
-            {
-              args: ["--model", "simulation/definitely-missing"],
-              capture: "08-unavailable-model.txt",
-              expected: "Model unavailable: simulation/definitely-missing",
-            },
-            {
-              args: ["--agent", "definitely-missing"],
-              capture: "09-unavailable-agent.txt",
-              expected: 'Agent not found: "definitely-missing"',
-            },
-          ]) {
-            const child = Bun.spawn(
-              [
-                process.execPath,
-                path.join(root, "packages/cli/src/index.ts"),
-                "run",
-                "--server",
-                registration.url,
-                ...failure.args,
-                "optimistic selection check",
-              ],
-              {
-                cwd: path.join(root, "packages/cli"),
-                env: {
-                  ...process.env,
-                  PWD: path.join(artifacts, "files"),
-                  OPENCODE_PASSWORD: registration.password,
-                  OPENCODE_CONFIG_DIR: path.join(artifacts, "files/.opencode"),
-                  OPENCODE_DISABLE_AUTOUPDATE: "1",
-                },
-                stdin: "ignore",
-                stdout: "pipe",
-                stderr: "pipe",
-              },
-            )
-            const [exitCode, stdout, stderr] = await Promise.all([
-              child.exited,
-              new Response(child.stdout).text(),
-              new Response(child.stderr).text(),
-            ])
-            await Bun.write(path.join(snapshots, failure.capture), stdout + stderr)
-            if (exitCode !== 1) throw new Error(`${failure.expected} run exited with status ${exitCode}`)
-            if (!stderr.includes(failure.expected))
-              throw new Error(`Selection failure was not diagnosed by execution: ${stderr}`)
-          }
-        })
-      })
-
-      yield* journey.pipe(Effect.ensuring(Effect.promise(() => tmux(["kill-session", "-t", session], true))))
-    }),
-})
-
-/** @param {string[]} args */
-async function tmux(args, allowFailure = false) {
-  const child = Bun.spawn(["tmux", ...args], { stdout: "pipe", stderr: "pipe" })
-  let timedOut = false
-  const timeout = setTimeout(() => {
-    timedOut = true
-    child.kill("SIGKILL")
-  }, 5_000)
-  const [status, stdout, stderr] = await Promise.all([
-    child.exited,
-    new Response(child.stdout).text(),
-    new Response(child.stderr).text(),
-  ])
-  clearTimeout(timeout)
-  if (timedOut) throw new Error(`tmux ${args[0]} timed out`)
-  if (status !== 0 && !allowFailure) throw new Error(`tmux ${args[0]} failed: ${stderr || stdout}`)
-  return stdout
-}
-
-/** @param {string} session */
-function capturePane(session) {
-  return tmux(["capture-pane", "-p", "-t", session, "-S", "-"])
-}
-
-/** @param {string} session */
-function captureVisiblePane(session) {
-  return tmux(["capture-pane", "-p", "-t", session])
-}
-
-/** @param {string} session @param {string} text @param {number} [timeout] */
-async function waitForVisiblePane(session, text, timeout = 5_000) {
-  const deadline = Date.now() + timeout
-  let last = ""
-  while (Date.now() < deadline) {
-    last = await captureVisiblePane(session)
-    if (last.includes(text)) return last
-    if (!(await paneAlive(session))) throw new Error(`Mini exited before rendering ${JSON.stringify(text)}:\n${last}`)
-    await Bun.sleep(50)
-  }
-  throw new Error(`Timed out waiting for visible ${JSON.stringify(text)}:\n${last}`)
-}
-
-/** @param {string} session */
-async function paneAlive(session) {
-  return (await tmux(["display-message", "-p", "-t", session, "#{pane_dead}"], true)).trim() === "0"
-}
-
-/** @param {string} session */
-async function paneDeadStatus(session) {
-  return Number((await tmux(["display-message", "-p", "-t", session, "#{pane_dead_status}"])).trim())
-}
-
-/**
- * @param {string} session
- * @param {string} text
- * @param {number} [timeout]
- * @param {(() => Promise<void>) | undefined} [trigger]
- */
-async function waitForPane(session, text, timeout = 5_000, trigger) {
-  const deadline = Date.now() + timeout
-  let last = ""
-  while (Date.now() < deadline) {
-    await trigger?.()
-    last = await capturePane(session)
-    if (last.includes(text)) return last
-    if (!(await paneAlive(session))) throw new Error(`Mini exited before rendering ${JSON.stringify(text)}:\n${last}`)
-    await Bun.sleep(50)
-  }
-  throw new Error(`Timed out waiting for ${JSON.stringify(text)}:\n${last}`)
-}
-
-/** @param {string} session */
-async function waitForDeadPane(session) {
-  for (let attempt = 0; attempt < 100; attempt++) {
-    if (!(await paneAlive(session))) return
-    await Bun.sleep(50)
-  }
-  throw new Error("Mini did not tear down after the exit sequence")
-}
-
-/**
- * @param {string} file
- * @param {(value: string) => boolean} accept
- */
-async function waitForFile(file, accept) {
-  let value = ""
-  for (let attempt = 0; attempt < 100; attempt++) {
-    value = await Bun.file(file)
-      .text()
-      .catch(() => "")
-    if (accept(value)) return value
-    await Bun.sleep(50)
-  }
-  throw new Error("resize did not replay committed transcript output")
-}
-
-/** @param {string} artifacts */
-async function configureServicePort(artifacts) {
-  const probe = Bun.serve({ hostname: "127.0.0.1", port: 0, fetch: () => new Response() })
-  const port = probe.port
-  await probe.stop(true)
-  if (!port) throw new Error("Failed to allocate a Drive service port")
-  const file = path.join(artifacts, "files/.opencode/service-local.json")
-  await mkdir(path.dirname(file), { recursive: true })
-  await Bun.write(file, JSON.stringify({ port }))
-}
-
-/** @param {string} artifacts */
-async function serviceRegistration(artifacts) {
-  const directory = path.join(artifacts, "home/.local/state/opencode")
-  for (let attempt = 0; attempt < 200; attempt++) {
-    for (const name of ["service-local.json", "service.json"]) {
-      const value = await Bun.file(path.join(directory, name))
-        .json()
-        .catch(() => undefined)
-      if (isRegistration(value)) return value
-    }
-    await Bun.sleep(50)
-  }
-  throw new Error("Drive service registration was not written")
-}
-
-/** @param {unknown} value */
-function isRegistration(value) {
-  return (
-    typeof value === "object" &&
-    value !== null &&
-    "url" in value &&
-    typeof value.url === "string" &&
-    "password" in value &&
-    typeof value.password === "string"
-  )
-}

packages/cli/test/drive/run-smoke.drive.mjs

@@ -1,87 +0,0 @@
-import { defineScript } from "opencode-drive"
-import { mkdir } from "node:fs/promises"
-import path from "node:path"
-
-export default defineScript({
-  launch: "manual",
-  setup({ config }) {
-    config.autoupdate = false
-  },
-  async run({ artifacts, llm, server }) {
-    await configureServicePort(artifacts)
-    llm.queue(llm.text("drive noninteractive smoke ok"))
-    await server.launch()
-
-    const registration = await serviceRegistration(artifacts)
-    const root = path.resolve(import.meta.dir, "../../../..")
-    const directory = path.join(artifacts, "files")
-    const child = Bun.spawn(
-      [
-        process.execPath,
-        path.join(root, "packages/cli/src/index.ts"),
-        "run",
-        "--server",
-        registration.url,
-        "drive smoke",
-      ],
-      {
-        cwd: path.join(root, "packages/cli"),
-        env: {
-          ...process.env,
-          PWD: directory,
-          OPENCODE_PASSWORD: registration.password,
-          OPENCODE_CONFIG_DIR: path.join(directory, ".opencode"),
-          OPENCODE_DISABLE_AUTOUPDATE: "1",
-        },
-        stdin: "ignore",
-        stdout: "pipe",
-        stderr: "pipe",
-      },
-    )
-    const [exitCode, stdout, stderr] = await Promise.all([
-      child.exited,
-      new Response(child.stdout).text(),
-      new Response(child.stderr).text(),
-    ])
-    if (exitCode !== 0) throw new Error(`run exited ${exitCode}: ${stderr}`)
-    if (stdout !== "drive noninteractive smoke ok\n") throw new Error(`unexpected run output: ${stdout}`)
-  },
-})
-
-/** @param {string} artifacts */
-async function configureServicePort(artifacts) {
-  const probe = Bun.serve({ hostname: "127.0.0.1", port: 0, fetch: () => new Response() })
-  const port = probe.port
-  await probe.stop(true)
-  if (!port) throw new Error("Failed to allocate a Drive service port")
-  const file = path.join(artifacts, "files/.opencode/service-local.json")
-  await mkdir(path.dirname(file), { recursive: true })
-  await Bun.write(file, JSON.stringify({ port }))
-}
-
-/** @param {string} artifacts */
-async function serviceRegistration(artifacts) {
-  const directory = path.join(artifacts, "home/.local/state/opencode")
-  for (let attempt = 0; attempt < 200; attempt++) {
-    for (const name of ["service-local.json", "service.json"]) {
-      const value = await Bun.file(path.join(directory, name))
-        .json()
-        .catch(() => undefined)
-      if (isRegistration(value)) return value
-    }
-    await Bun.sleep(50)
-  }
-  throw new Error("Drive service registration was not written")
-}
-
-/** @param {unknown} value */
-function isRegistration(value) {
-  return (
-    typeof value === "object" &&
-    value !== null &&
-    "url" in value &&
-    typeof value.url === "string" &&
-    "password" in value &&
-    typeof value.password === "string"
-  )
-}

packages/cli/vite.node.config.ts

@@ -4,6 +4,7 @@ import { createRequire } from "node:module"
 import { defineConfig, type Plugin, type UserConfig } from "vite"
 import solid from "vite-plugin-solid"
 import { nodeExecArgv, nodeTarget, type NodeTarget, photonWasmAsset, shellParserWasmAssets } from "./src/node/target"
+import { verifySimulationGraph } from "./script/verify-artifact"
 
 const dir = import.meta.dirname
 
@@ -48,6 +49,15 @@ function runtimeRequirePlugin(): Plugin {
   }
 }
 
+function simulationGraphPlugin(): Plugin {
+  return {
+    name: "opencode:simulation-graph",
+    generateBundle() {
+      verifySimulationGraph(this.getModuleIds())
+    },
+  }
+}
+
 function fffNodePlugin(): Plugin {
   return {
     name: "opencode:fff-node",
@@ -240,6 +250,7 @@ export function mainConfig(input: NodeBuildInput): UserConfig {
       rawTextPlugin(),
       runtimeRequirePlugin(),
       fffNodePlugin(),
+      simulationGraphPlugin(),
       solid({
         solid: {
           generate: "universal",
@@ -255,6 +266,7 @@ export function mainConfig(input: NodeBuildInput): UserConfig {
       OPENCODE_CHANNEL: JSON.stringify(input.channel),
       OPENCODE_LIBC: input.target.platform === "linux" ? JSON.stringify("glibc") : "undefined",
       FFF_LIBC: input.target.platform === "linux" ? JSON.stringify("gnu") : "undefined",
+      "process.env.WS_NO_BUFFER_UTIL": JSON.stringify("1"),
     },
     ssr: { noExternal: true },
     build: {
@@ -264,7 +276,6 @@ export function mainConfig(input: NodeBuildInput): UserConfig {
       emptyOutDir: false,
       minify: true,
       rollupOptions: {
-        external: [/^@opencode-ai\/simulation(?:\/|$)/],
         output: output("opencode.mjs", nodePrelude(input)),
       },
     },

packages/client/src/promise/generated/client.ts

@@ -1671,7 +1671,7 @@ export function make(options: ClientOptions) {
         request<WorktreeListOutput>(
           {
             method: "GET",
-            path: `/api/experimental/project/${encodeURIComponent(input.projectID)}/worktree`,
+            path: `/api/worktree/${encodeURIComponent(input.projectID)}`,
             successStatus: 200,
             declaredStatuses: [401, 400],
             empty: false,
@@ -1682,7 +1682,7 @@ export function make(options: ClientOptions) {
         request<WorktreeCreateOutput>(
           {
             method: "POST",
-            path: `/api/experimental/project/${encodeURIComponent(input.projectID)}/worktree`,
+            path: `/api/worktree/${encodeURIComponent(input.projectID)}`,
             body: {
               strategy: input["strategy"],
               from: input["from"],
@@ -1699,7 +1699,7 @@ export function make(options: ClientOptions) {
         request<WorktreeRemoveOutput>(
           {
             method: "DELETE",
-            path: `/api/experimental/project/${encodeURIComponent(input.projectID)}/worktree`,
+            path: `/api/worktree/${encodeURIComponent(input.projectID)}`,
             body: { directory: input["directory"], force: input["force"] },
             successStatus: 204,
             declaredStatuses: [400, 401],
@@ -1711,7 +1711,7 @@ export function make(options: ClientOptions) {
         request<WorktreeRefreshOutput>(
           {
             method: "POST",
-            path: `/api/experimental/project/${encodeURIComponent(input.projectID)}/worktree/refresh`,
+            path: `/api/worktree/${encodeURIComponent(input.projectID)}/refresh`,
             successStatus: 204,
             declaredStatuses: [400, 401],
             empty: true,

packages/client/src/promise/generated/types.ts

@@ -1787,7 +1787,7 @@ export type ConfigEntry =
             | { repository: string; branch?: string; description?: string; hidden?: boolean }
             | { path: string; description?: string; hidden?: boolean }
         }
-        websearch?: { provider: string }
+        websearch?: false | { provider: "random" | (string & {}) }
         plugins?: Array<string | { package: string; options?: { [x: string]: JsonValue } }>
         warming?: boolean | { prompt?: string; interval?: string; duration?: string }
         providers?: {
@@ -1835,13 +1835,13 @@ export type ConfigEntry =
           }
         }
         experimental?: {
+          portable_shell_scanner?: boolean
           subagent_depth?: number
           policies?: Array<{ action: "provider.use"; resource: string; effect: "allow" | "deny" }>
         }
       }
     }
   | { type: "directory"; path: string }
-  | { type: "file"; path: string }
   | { type: "agents"; path: string }
   | { type: "claude"; path: string }
 

packages/client/test/promise.test.ts

@@ -66,7 +66,6 @@ test("config.get returns ordered config entries for a location", async () => {
         ],
       },
     },
-    { type: "file" as const, path: "/tmp/project/opencode.json" },
   ]
   const client = OpenCode.make({
     baseUrl: "http://localhost:3000",
@@ -283,10 +282,10 @@ test("worktree methods use the global project contract", async () => {
   await client.worktree.refresh({ projectID: "proj_test" })
 
   expect(requests.map((request) => [request.method, request.url])).toEqual([
-    ["GET", "http://localhost:3000/api/experimental/project/proj_test/worktree"],
-    ["POST", "http://localhost:3000/api/experimental/project/proj_test/worktree"],
-    ["DELETE", "http://localhost:3000/api/experimental/project/proj_test/worktree"],
-    ["POST", "http://localhost:3000/api/experimental/project/proj_test/worktree/refresh"],
+    ["GET", "http://localhost:3000/api/worktree/proj_test"],
+    ["POST", "http://localhost:3000/api/worktree/proj_test"],
+    ["DELETE", "http://localhost:3000/api/worktree/proj_test"],
+    ["POST", "http://localhost:3000/api/worktree/proj_test/refresh"],
   ])
   expect(await requests[1]?.json()).toEqual({
     strategy: "git",

packages/core/package.json

@@ -80,6 +80,7 @@
     "@types/bun": "catalog:",
     "@types/node": "catalog:",
     "@types/which": "3.0.4",
+    "@opencode-ai/shell-scan": "workspace:*",
     "@parcel/watcher-darwin-arm64": "2.5.1",
     "@parcel/watcher-darwin-x64": "2.5.1",
     "@parcel/watcher-linux-arm64-glibc": "2.5.1",

packages/core/script/build.ts

@@ -20,6 +20,16 @@ const result = await Bun.build({
   format: "esm",
   packages: "external",
   external: ["#sqlite", "#pty", "#fff", "#photon-wasm", "#shell-parser-wasm", "#process-lock-ffi", "#v1-migration"],
+  plugins: [
+    {
+      name: "bundle-shell-scan",
+      setup(build) {
+        build.onResolve({ filter: /^@opencode-ai\/shell-scan$/ }, () => ({
+          path: path.resolve("../shell-scan/src/index.ts"),
+        }))
+      },
+    },
+  ],
   splitting: true,
   loader: {
     ".txt": "text",

packages/core/src/aisdk.ts

@@ -321,7 +321,7 @@ function modelFromLanguage(info: Info, language: LanguageModelV3) {
     transport: {
       id: "ai-sdk",
       prepare: (input) => Effect.succeed(input.body),
-      frames: () => Stream.empty,
+      execute: () => Effect.succeed({ frames: Stream.empty }),
     },
     defaults: {
       headers: info.headers,

packages/core/src/config.ts

@@ -4,13 +4,14 @@ import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
 import path from "path"
 import { isDeepStrictEqual } from "node:util"
 import { type ParseError, parse } from "jsonc-parser"
+import { applyEdits, modify } from "jsonc-parser"
 import { Context, Effect, Layer, Option, PubSub, Ref, Schema, Semaphore, Stream } from "effect"
+import { produce, type Draft } from "immer"
 import {
   AgentsDirectory,
   ClaudeDirectory,
   Directory,
   Document,
-  File,
   Info,
   type Entry,
   Event,
@@ -36,6 +37,8 @@ export function latest<K extends keyof Info>(entries: readonly Entry[], key: K):
 export interface Interface {
   /** Returns location config documents and discovery sources from lowest to highest priority. */
   readonly entries: () => Effect.Effect<Entry[]>
+  /** Updates the first file-backed configuration document. */
+  readonly update: (update: (draft: Draft<Info>) => void) => Effect.Effect<Info, UpdateError>
   /**
    * Streams raw filesystem updates under config roots. Config owns root
    * topology and watch reconciliation; domain owners filter this feed for the
@@ -44,6 +47,11 @@ export interface Interface {
   readonly changes: () => Stream.Stream<Watcher.Update>
 }
 
+export class UpdateError extends Schema.TaggedErrorClass<UpdateError>()("Config.UpdateError", {
+  message: Schema.String,
+  cause: Schema.optional(Schema.Defect()),
+}) {}
+
 export const Options = Schema.Struct({
   project: Schema.optional(Schema.Boolean),
   file: Schema.optional(Schema.String),
@@ -70,6 +78,19 @@ export const testLayer = (initial: Entry[] = []) =>
       const updates = yield* PubSub.unbounded<Watcher.Update>()
       const service = Test.of({
         entries: () => Ref.get(entries),
+        update: (update) =>
+          Effect.gen(function* () {
+            const current = yield* Ref.get(entries)
+            const index = current.findIndex((entry) => entry.type === "document" && entry.path !== undefined)
+            if (index === -1)
+              return yield* Effect.fail(new UpdateError({ message: "No editable config document found" }))
+            const entry = current[index]
+            if (!entry || entry.type !== "document")
+              return yield* Effect.fail(new UpdateError({ message: "No editable config document found" }))
+            const info = produce(entry.info, update)
+            yield* Ref.set(entries, current.with(index, new Document({ type: "document", path: entry.path, info })))
+            return info
+          }),
         changes: () => Stream.fromPubSub(updates),
         setEntries: (next) => Ref.set(entries, next),
         emitChange: (update) => PubSub.publish(updates, update).pipe(Effect.asVoid),
@@ -91,6 +112,7 @@ export const layer = (options?: Options) =>
       const wellknown = yield* WellKnown.Service
       const names = ["opencode.json", "opencode.jsonc"]
       const reloadLock = Semaphore.makeUnsafe(1)
+      const fileTargets = new Set<AbsolutePath>()
       const decodeOptions = { errors: "all", onExcessProperty: "ignore", propertyOrder: "original" } as const
       const decodeInfo = Schema.decodeUnknownOption(Info, decodeOptions)
       const parseInfo = Effect.fn("Config.parseInfo")(function* (text: string, source: string) {
@@ -131,7 +153,7 @@ export const layer = (options?: Options) =>
         const substituted = yield* ConfigVariable.substitute({ type: "path", path: filepath, text })
         const info = yield* parseInfo(substituted, filepath)
         if (!info) return
-        return new Document({ type: "document", path: filepath, info })
+        return new Document({ type: "document", path: AbsolutePath.make(filepath), info })
       })
 
       const loadWellknown = Effect.fn("Config.loadWellknown")(function* () {
@@ -224,25 +246,18 @@ export const layer = (options?: Options) =>
         const directPaths = discovered
           .filter((item) => ![".agents", ".claude", ".opencode"].includes(path.basename(item)))
           .toReversed()
-        const direct = yield* Effect.forEach(directPaths, (filepath) =>
-          loadFile(filepath).pipe(
-            Effect.map((config) => [
-              ...(config ? [config] : []),
-              new File({ type: "file", path: AbsolutePath.make(filepath) }),
-            ]),
-          ),
-        ).pipe(
+        fileTargets.clear()
+        directPaths.forEach((filepath) => fileTargets.add(AbsolutePath.make(filepath)))
+        const direct = yield* Effect.forEach(directPaths, (filepath) => loadFile(filepath)).pipe(
           Effect.orDie,
-          Effect.map((entries) => entries.flat()),
+          Effect.map((entries) => entries.filter((entry): entry is Document => entry !== undefined)),
         )
 
         const file = options?.file
+        if (file) fileTargets.add(AbsolutePath.make(path.resolve(file)))
         const explicit = file
           ? yield* loadFile(path.resolve(file)).pipe(
-              Effect.map((config) => [
-                ...(config ? [config] : []),
-                new File({ type: "file", path: AbsolutePath.make(path.resolve(file)) }),
-              ]),
+              Effect.map((config) => (config ? [config] : [])),
               Effect.orDie,
             )
           : []
@@ -285,7 +300,10 @@ export const layer = (options?: Options) =>
       const watched = new Set<string>()
       const reconcile = Effect.fn("Config.reconcileWatches")(function* (entries: readonly Entry[]) {
         const directories = entries.flatMap((entry) => (entry.type === "directory" ? [entry.path] : []))
-        const files = entries.flatMap((entry) => (entry.type === "file" ? [entry.path] : []))
+        const files = [
+          ...entries.flatMap((entry) => (entry.type === "document" && entry.path ? [entry.path] : [])),
+          ...fileTargets,
+        ]
         const targets = [
           ...directories.map((path) => ({ path, type: "directory" as const, ignore })),
           ...files
@@ -308,9 +326,9 @@ export const layer = (options?: Options) =>
         reloadLock.withPermit(
           Effect.gen(function* () {
             const next = yield* discover()
+            yield* reconcile(next)
             if (isDeepStrictEqual(configs, next)) return
             configs = next
-            yield* reconcile(next)
             yield* bus.publish(Event.Updated, {})
           }),
         ),
@@ -364,10 +382,54 @@ export const layer = (options?: Options) =>
       )
       yield* reconcile(initial)
 
+      const update = Effect.fn("Config.update")((mutate: (draft: Draft<Info>) => void) =>
+        reloadLock.withPermit(
+          Effect.gen(function* () {
+            // TODO: Replace entry-order selection with an explicit config scope/target model.
+            const document = configs.find((entry) => entry.type === "document" && entry.path !== undefined)
+            if (!document || document.type !== "document" || !document.path)
+              return yield* Effect.fail(new UpdateError({ message: "No editable config document found" }))
+            const next = yield* Effect.try({
+              try: () => produce(document.info, mutate),
+              catch: (cause) => new UpdateError({ message: "Config update failed", cause }),
+            })
+            const edits = changes(document.info, next)
+            if (!edits.length) return document.info
+            const text = yield* fs
+              .readFileString(document.path)
+              .pipe(
+                Effect.mapError(
+                  (cause) => new UpdateError({ message: `Failed to read config: ${document.path}`, cause }),
+                ),
+              )
+            const updated = edits.reduce(
+              (text, edit) =>
+                applyEdits(
+                  text,
+                  modify(text, edit.path, edit.value, { formattingOptions: { tabSize: 2, insertSpaces: true } }),
+                ),
+              text,
+            )
+            const info = yield* parseInfo(updated, document.path)
+            if (!info)
+              return yield* Effect.fail(new UpdateError({ message: `Invalid config update: ${document.path}` }))
+            const temporary = document.path + ".tmp"
+            yield* fs.writeFileString(temporary, updated.endsWith("\n") ? updated : updated + "\n").pipe(
+              Effect.andThen(fs.rename(temporary, document.path)),
+              Effect.mapError(
+                (cause) => new UpdateError({ message: `Failed to write config: ${document.path}`, cause }),
+              ),
+            )
+            return info
+          }),
+        ),
+      )
+
       return Service.of({
         entries: Effect.fn("Config.entries")(function* () {
           return configs
         }),
+        update,
         changes: () => Stream.fromPubSub(updates),
       })
     }),
@@ -382,3 +444,26 @@ export function configured(options?: Options) {
 }
 
 export const node = configured()
+
+type Edit = { readonly path: (string | number)[]; readonly value: unknown }
+
+function changes(before: unknown, after: unknown, path: (string | number)[] = []): Edit[] {
+  if (Object.is(before, after)) return []
+  if (
+    before !== null &&
+    after !== null &&
+    typeof before === "object" &&
+    typeof after === "object" &&
+    !Array.isArray(before) &&
+    !Array.isArray(after)
+  ) {
+    const previous = before as Record<string, unknown>
+    const next = after as Record<string, unknown>
+    return [...new Set([...Object.keys(previous), ...Object.keys(next)])].flatMap((key) => {
+      if (!(key in next)) return [{ path: [...path, key], value: undefined }]
+      if (!(key in previous)) return [{ path: [...path, key], value: next[key] }]
+      return changes(previous[key], next[key], [...path, key])
+    })
+  }
+  return [{ path, value: after }]
+}

packages/core/src/config/normalize.ts

@@ -401,6 +401,15 @@ function normalizeExperimental(
       unsupportedExperimental.forEach((key) =>
         unsupportedIfPresent(experimental, key, ["experimental", key], diagnostics),
       )
+      if (own(experimental, "portable_shell_scanner")) {
+        const value = decodeEncoded(
+          ConfigExperimental.Info.fields.portable_shell_scanner,
+          experimental.portable_shell_scanner,
+          ["experimental", "portable_shell_scanner"],
+          diagnostics,
+        )
+        if (value !== undefined) result.portable_shell_scanner = value
+      }
       if (own(experimental, "subagent_depth")) {
         const value = decodeEncoded(
           ConfigExperimental.Info.fields.subagent_depth,

packages/core/src/config/plugin/agent.ts

@@ -16,6 +16,7 @@ import { Permission } from "../../permission.js"
 import type { LocationMutation } from "../../location-mutation.js"
 import type { ReadTool } from "../../tool/plugin/read.js"
 import type { EditTool } from "../../tool/plugin/edit.js"
+import { AbsolutePath } from "../../schema.js"
 
 const legacySources = [
   { pattern: "{agent,agents}/**/*.md", primary: false },
@@ -210,5 +211,5 @@ function decode(file: { directory: string; filepath: string; primary: boolean },
     }),
   )
   if (!info) return
-  return new Document({ type: "document", path: file.filepath, info })
+  return new Document({ type: "document", path: AbsolutePath.make(file.filepath), info })
 }

packages/core/src/config/plugin/websearch.ts

@@ -10,8 +10,9 @@ export const Plugin = define({
     const config = yield* Config.Service
     const loaded = { entries: yield* config.entries() }
     yield* ctx.websearch.transform((websearch) => {
-      const providerID = Config.latest(loaded.entries, "websearch")?.provider
-      if (providerID) websearch.default.set(providerID)
+      const selection = Config.latest(loaded.entries, "websearch")
+      if (selection === false) websearch.default.set(false)
+      if (selection) websearch.default.set(selection.provider)
     })
     yield* ctx.event.subscribe().pipe(
       Stream.filter((event) => event.type === "config.updated"),

packages/core/src/effect/app-node-platform.ts

@@ -1,4 +1,6 @@
 import { LLMClient, RequestExecutor } from "@opencode-ai/ai/route"
+import { NodeSocket } from "@effect/platform-node"
+import { Socket } from "effect/unstable/socket"
 import { makeGlobalNode } from "@opencode-ai/util/effect/app-node"
 import { httpClient } from "@opencode-ai/util/effect/app-node-platform"
 
@@ -10,4 +12,10 @@ export const requestExecutor = makeGlobalNode({
 
 export const llmClient = makeGlobalNode({ service: LLMClient.Service, layer: LLMClient.layer, deps: [requestExecutor] })
 
+export const webSocketConstructor = makeGlobalNode({
+  service: Socket.WebSocketConstructor,
+  layer: NodeSocket.layerWebSocketConstructorWS,
+  deps: [],
+})
+
 export * as LayerNodePlatform from "./app-node-platform.js"

packages/core/src/location-services.ts

@@ -33,6 +33,7 @@ import { WebSearch } from "./websearch.js"
 import { ReferenceInstructions } from "./reference/instructions.js"
 import { SessionRunnerLLM } from "./session/runner/llm.js"
 import { SessionRunnerModel } from "./session/runner/model.js"
+import { SessionModelTransport } from "./session/model-transport.js"
 import { SessionCompaction } from "./session/compaction.js"
 import { SessionTitle } from "./session/title.js"
 import { Skill } from "./skill.js"
@@ -91,6 +92,7 @@ const locationServiceNodes = [
   McpTool.node,
   SessionInstructions.node,
   SessionRunnerModel.node,
+  SessionModelTransport.node,
   SessionCompaction.node,
   SessionTitle.node,
   Snapshot.node,

packages/core/src/plugin/hooks.ts

@@ -28,6 +28,10 @@ interface Failures extends Record<keyof Domains, unknown> {
 type Callback<Event, Error> = (event: Event) => Effect.Effect<void, Error>
 
 export interface Interface {
+  readonly has: <Domain extends keyof Domains>(
+    domain: Domain,
+    name: keyof Domains[Domain] & keyof Failures[Domain],
+  ) => Effect.Effect<boolean>
   readonly register: <Domain extends keyof Domains, Name extends keyof Domains[Domain] & keyof Failures[Domain]>(
     domain: Domain,
     name: Name,
@@ -74,7 +78,9 @@ const layer = Layer.effect(
       return event
     })
 
-    return Service.of({ register, trigger })
+    const has: Interface["has"] = (domain, name) => Effect.sync(() => callbacks.has(key(domain, name)))
+
+    return Service.of({ has, register, trigger })
   }),
 )
 

packages/core/src/plugin/host.ts

@@ -332,7 +332,10 @@ export const make = Effect.fn("PluginHost.make")(function* (plugin: import("../p
               }),
             default: {
               get: draft.default.get,
-              set: (providerID) => draft.default.set(WebSearch.ID.make(providerID)),
+              set: (selection) =>
+                draft.default.set(
+                  selection === false || selection === "random" ? selection : WebSearch.ID.make(selection),
+                ),
             },
           })
         }),

packages/core/src/plugin/promise.ts

@@ -1,396 +1,3 @@
 export * as PluginPromise from "./promise.js"
 
-import { define } from "@opencode-ai/plugin/effect/plugin"
-import type { Context, Plugin } from "@opencode-ai/plugin/promise/plugin"
-import type { Info } from "@opencode-ai/plugin/promise/tool"
-import { Agent } from "@opencode-ai/schema/agent"
-import { Integration } from "@opencode-ai/schema/integration"
-import { Location } from "@opencode-ai/schema/location"
-import { Model } from "@opencode-ai/schema/model"
-import { Provider } from "@opencode-ai/schema/provider"
-import { AbsolutePath } from "@opencode-ai/schema/schema"
-import { Session } from "@opencode-ai/schema/session"
-import { SessionMessage } from "@opencode-ai/schema/session-message"
-import { Skill } from "@opencode-ai/schema/skill"
-import { Workspace } from "@opencode-ai/schema/workspace"
-import { WebSearch } from "@opencode-ai/schema/websearch"
-import { DateTime, Effect, Scope, Stream } from "effect"
-import { Tool } from "../tool.js"
-
-type HostRegistration = { readonly dispose: Effect.Effect<void> }
-type Registration = { readonly dispose: () => Promise<void> }
-type PromiseEvent = ReturnType<Context["event"]["subscribe"]> extends AsyncIterable<infer Event> ? Event : never
-type JsonValue = null | boolean | number | string | Array<JsonValue> | { [key: string]: JsonValue }
-
-/**
- * Adapts a Promise plugin into an Effect plugin so the existing Effect-only
- * loader (`Plugin` / `PluginSupervisor`) can run it unchanged.
- *
- * Hook registrations created during the async `setup` attach to the plugin's
- * scope, so unloading the plugin disposes them. The captured fiber context
- * preserves boot-time batching, so Promise-plugin transforms still coalesce
- * into one reload per domain.
- */
-export function fromPromise(plugin: Plugin) {
-  return define({
-    id: plugin.id,
-    effect: (host) =>
-      Effect.gen(function* () {
-        const scope = yield* Scope.Scope
-        const context = yield* Effect.context<Scope.Scope>()
-
-        // Run a hook registration on the plugin scope and resolve once it is registered.
-        const register = (effect: Effect.Effect<HostRegistration, never, Scope.Scope>): Promise<Registration> =>
-          Effect.runPromiseWith(context)(Scope.provide(scope)(effect)).then((registration) => ({
-            dispose: () => Effect.runPromiseWith(context)(registration.dispose),
-          }))
-
-        const run = <A, E>(effect: Effect.Effect<A, E>) => Effect.runPromiseWith(context)(effect).then(wire)
-
-        const transform =
-          <Draft>(domain: {
-            transform: (callback: (draft: Draft) => void) => Effect.Effect<HostRegistration, never, Scope.Scope>
-          }) =>
-          (callback: (draft: Draft) => void) =>
-            register(
-              domain.transform((draft) => {
-                callback(draft)
-              }),
-            )
-
-        const context2: Context = {
-          app: host.app,
-          options: host.options,
-          agent: {
-            get: (input) => run(host.agent.get({ ...input, agentID: Agent.ID.make(input.agentID) })),
-            list: (input) => run(host.agent.list(input)),
-            transform: transform(host.agent),
-            reload: () => run(host.agent.reload()),
-          },
-          aisdk: {
-            hook: (name, callback) =>
-              register(host.aisdk.hook(name, (event) => Effect.promise(() => Promise.resolve(callback(event))))),
-          },
-          catalog: {
-            provider: {
-              list: (input) => run(host.catalog.provider.list(input)),
-              get: (input) =>
-                run(host.catalog.provider.get({ ...input, providerID: Provider.ID.make(input.providerID) })),
-            },
-            model: {
-              list: (input) => run(host.catalog.model.list(input)),
-              default: (input) =>
-                run(host.catalog.model.default(input)).then((result) => ({ ...result, data: result.data ?? null })),
-            },
-            transform: transform(host.catalog),
-            reload: () => run(host.catalog.reload()),
-          },
-          command: {
-            list: (input) => run(host.command.list(input)),
-            transform: transform(host.command),
-            reload: () => run(host.command.reload()),
-          },
-          event: {
-            subscribe: () => Stream.toAsyncIterable(host.event.subscribe().pipe(Stream.map(wireEvent))),
-          },
-          integration: {
-            list: (input) => run(host.integration.list(input)),
-            get: (input) =>
-              run(host.integration.get({ ...input, integrationID: Integration.ID.make(input.integrationID) })).then(
-                (result) => ({ ...result, data: result.data ?? null }),
-              ),
-            connect: {
-              key: (input) =>
-                run(
-                  host.integration.connect.key({ ...input, integrationID: Integration.ID.make(input.integrationID) }),
-                ),
-            },
-            oauth: {
-              connect: (input) =>
-                run(
-                  host.integration.oauth.connect({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    methodID: Integration.MethodID.make(input.methodID),
-                  }),
-                ),
-              status: (input) =>
-                run(
-                  host.integration.oauth.status({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    attemptID: Integration.AttemptID.make(input.attemptID),
-                  }),
-                ),
-              complete: (input) =>
-                run(
-                  host.integration.oauth.complete({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    attemptID: Integration.AttemptID.make(input.attemptID),
-                  }),
-                ),
-              cancel: (input) =>
-                run(
-                  host.integration.oauth.cancel({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    attemptID: Integration.AttemptID.make(input.attemptID),
-                  }),
-                ),
-            },
-            command: {
-              connect: (input) =>
-                run(
-                  host.integration.command.connect({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    methodID: Integration.MethodID.make(input.methodID),
-                  }),
-                ),
-              status: (input) =>
-                run(
-                  host.integration.command.status({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    attemptID: Integration.AttemptID.make(input.attemptID),
-                  }),
-                ),
-              cancel: (input) =>
-                run(
-                  host.integration.command.cancel({
-                    ...input,
-                    integrationID: Integration.ID.make(input.integrationID),
-                    attemptID: Integration.AttemptID.make(input.attemptID),
-                  }),
-                ),
-            },
-            transform: (callback) =>
-              register(
-                host.integration.transform((draft) =>
-                  callback({
-                    list: draft.list,
-                    get: draft.get,
-                    update: draft.update,
-                    remove: draft.remove,
-                    method: {
-                      list: draft.method.list,
-                      update: (input) => {
-                        if (!("authorize" in input)) return draft.method.update(input)
-                        const refresh = input.refresh
-                        draft.method.update({
-                          ...input,
-                          authorize: (answer) =>
-                            Effect.promise(() => input.authorize(answer)).pipe(
-                              Effect.map((authorization) =>
-                                authorization.mode === "auto"
-                                  ? {
-                                      ...authorization,
-                                      callback: Effect.promise(() => authorization.callback),
-                                    }
-                                  : {
-                                      ...authorization,
-                                      callback: (code) => Effect.promise(() => authorization.callback(code)),
-                                    },
-                              ),
-                            ),
-                          refresh:
-                            refresh === undefined
-                              ? undefined
-                              : (credential) => Effect.promise(() => refresh(credential)),
-                        })
-                      },
-                      remove: draft.method.remove,
-                    },
-                  }),
-                ),
-              ),
-            reload: () => run(host.integration.reload()),
-            connection: {
-              active: (id) => Effect.runPromiseWith(context)(host.integration.connection.active(id)),
-              resolve: (connection) => Effect.runPromiseWith(context)(host.integration.connection.resolve(connection)),
-            },
-          },
-          plugin: {
-            list: (input) => run(host.plugin.list(input)),
-          },
-          reference: {
-            list: (input) => run(host.reference.list(input)),
-            transform: transform(host.reference),
-            reload: () => run(host.reference.reload()),
-          },
-          skill: {
-            list: (input) => run(host.skill.list(input)),
-            transform: transform(host.skill),
-            reload: () => run(host.skill.reload()),
-          },
-          tool: {
-            transform: (callback) =>
-              register(
-                host.tool.transform((draft) =>
-                  callback({
-                    add: (tool: Info) =>
-                      draft.add({
-                        ...tool,
-                        execute: (input, context) => executePromiseTool(tool, input, context),
-                      }),
-                  }),
-                ),
-              ),
-            hook: (name, callback) =>
-              register(host.tool.hook(name, (event) => Effect.promise(() => Promise.resolve(callback(event))))),
-          },
-          websearch: {
-            providers: (input) => run(host.websearch.providers(input)),
-            query: (input) =>
-              run(
-                host.websearch.query({
-                  ...input,
-                  providerID: input.providerID === undefined ? undefined : WebSearch.ID.make(input.providerID),
-                }),
-              ),
-            reload: () => run(host.websearch.reload()),
-            transform: (callback) =>
-              register(
-                host.websearch.transform((draft) => {
-                  callback({
-                    add: (definition) =>
-                      draft.add({
-                        id: definition.id,
-                        name: definition.name,
-                        execute: (input) => attempt((signal) => definition.execute(input, { signal })),
-                      }),
-                    default: draft.default,
-                  })
-                }),
-              ),
-          },
-          session: {
-            hook: (name, callback) =>
-              register(host.session.hook(name, (event) => Effect.promise(() => Promise.resolve(callback(event))))),
-            create: (input) =>
-              run(
-                host.session.create(
-                  input === undefined
-                    ? undefined
-                    : {
-                        id: input.id == null ? undefined : Session.ID.make(input.id),
-                        agent: input.agent == null ? undefined : Agent.ID.make(input.agent),
-                        model: input.model == null ? undefined : model(input.model),
-                        location:
-                          input.location == null
-                            ? undefined
-                            : Location.Ref.make({
-                                directory: AbsolutePath.make(input.location.directory),
-                                workspaceID:
-                                  input.location.workspaceID === undefined
-                                    ? undefined
-                                    : Workspace.ID.make(input.location.workspaceID),
-                              }),
-                      },
-                ),
-              ),
-            get: (input) => run(host.session.get({ sessionID: Session.ID.make(input.sessionID) })),
-            prompt: (input) =>
-              run(
-                host.session.prompt({
-                  ...input,
-                  sessionID: Session.ID.make(input.sessionID),
-                  id: input.id == null ? undefined : SessionMessage.ID.make(input.id),
-                  skills: input.skills?.map((skill) => ({ ...skill, id: Skill.ID.make(skill.id) })),
-                  delivery: input.delivery ?? undefined,
-                  resume: input.resume ?? undefined,
-                }),
-              ),
-            generate: (input) =>
-              run(host.session.generate({ sessionID: Session.ID.make(input.sessionID), prompt: input.prompt })),
-            command: (input) =>
-              run(
-                host.session.command({
-                  ...input,
-                  sessionID: Session.ID.make(input.sessionID),
-                  id: input.id == null ? undefined : SessionMessage.ID.make(input.id),
-                  agent: input.agent == null ? undefined : Agent.ID.make(input.agent),
-                  model: input.model == null ? undefined : model(input.model),
-                  skills: input.skills?.map((skill) => ({ ...skill, id: Skill.ID.make(skill.id) })),
-                  arguments: input.arguments ?? undefined,
-                  delivery: input.delivery ?? undefined,
-                  resume: input.resume ?? undefined,
-                }),
-              ),
-            synthetic: (input) =>
-              run(
-                host.session.synthetic({
-                  ...input,
-                  sessionID: Session.ID.make(input.sessionID),
-                  id: input.id == null ? undefined : SessionMessage.ID.make(input.id),
-                  description: input.description ?? undefined,
-                  delivery: input.delivery ?? undefined,
-                  resume: input.resume ?? undefined,
-                }),
-              ),
-            interrupt: (input) => run(host.session.interrupt({ sessionID: Session.ID.make(input.sessionID) })),
-          },
-          shell: {
-            hook: (name, callback) =>
-              register(host.shell.hook(name, (event) => Effect.promise(() => Promise.resolve(callback(event))))),
-          },
-        }
-
-        const cleanup = yield* Effect.promise(() => Promise.resolve(plugin.setup(context2)))
-        if (!cleanup) return
-        yield* Effect.addFinalizer(() => Effect.promise(() => Promise.resolve(cleanup())))
-      }),
-  })
-}
-
-function attempt<A>(evaluate: (signal: AbortSignal) => PromiseLike<A>) {
-  return Effect.tryPromise({ try: evaluate, catch: (cause) => cause })
-}
-
-function model(input: { readonly id: string; readonly providerID: string; readonly variant?: string }) {
-  return Model.Ref.make({
-    id: Model.ID.make(input.id),
-    providerID: Provider.ID.make(input.providerID),
-    variant: input.variant === undefined ? undefined : Model.VariantID.make(input.variant),
-  })
-}
-
-type Wire<Value> = unknown extends Value
-  ? JsonValue
-  : Value extends string | number | boolean | bigint | symbol | null | undefined
-    ? Value
-    : Value extends DateTime.DateTime
-      ? number
-      : Value extends readonly [infer Head, ...infer Tail]
-        ? [Wire<Head>, ...WireTuple<Tail>]
-        : Value extends ReadonlyArray<infer Item>
-          ? Array<Wire<Item>>
-          : Value extends object
-            ? { -readonly [Key in keyof Value]: Wire<Value[Key]> }
-            : Value
-
-type WireTuple<Value extends ReadonlyArray<unknown>> = {
-  -readonly [Key in keyof Value]: Wire<Value[Key]>
-}
-
-function wire<Value>(value: Value): Wire<Value>
-function wire(value: unknown): unknown {
-  if (DateTime.isDateTime(value)) return DateTime.toEpochMillis(value)
-  if (Array.isArray(value)) return value.map(wire)
-  if (typeof value !== "object" || value === null) return value
-  return Object.fromEntries(Object.entries(value).map(([key, item]) => [key, wire(item)]))
-}
-
-function wireEvent(value: unknown): PromiseEvent
-function wireEvent(value: unknown): unknown {
-  return wire(value)
-}
-
-const executePromiseTool = (tool: Info, input: any, context: Tool.Context) =>
-  Effect.promise(() =>
-    tool.execute(input, {
-      ...context,
-      progress: (update) => Effect.runPromise(context.progress(update)),
-    }),
-  )
+export { fromPromise } from "@opencode-ai/plugin/promise/adapter"

packages/core/src/plugin/provider/openai.ts

@@ -5,7 +5,6 @@ import { App } from "../../app.js"
 import { Credential } from "../../credential.js"
 import { Bus } from "../../bus.js"
 import { Integration } from "../../integration.js"
-import { Model } from "../../model.js"
 import { OauthCallbackPage } from "../../oauth/page.js"
 import { Provider } from "../../provider.js"
 import type { PluginInternal } from "../internal.js"
@@ -203,10 +202,10 @@ export const OpenAIPlugin = define({
       if (!item) return
       item.provider.settings = Provider.mergeOverlay(item.provider.settings, { baseURL: codexBaseURL })
       const account = chatgpt.metadata?.accountID
-      item.provider.headers = Provider.mergeHeaders(
-        item.provider.headers,
-        typeof account === "string" ? { "chatgpt-account-id": account } : undefined,
-      )
+      item.provider.headers = Provider.mergeHeaders(item.provider.headers, {
+        originator: "opencode",
+        ...(typeof account === "string" ? { "chatgpt-account-id": account } : {}),
+      })
       for (const model of item.models.values()) {
         // ChatGPT-plan tokens only authorize codex-eligible models, and the
         // subscription covers usage, so hide the rest and zero the cost.
@@ -230,17 +229,6 @@ export const OpenAIPlugin = define({
         })
       }
     })
-    yield* ctx.session.hook("http.request", (evt) =>
-      Effect.sync(() => {
-        if (!chatgpt || evt.model.providerID !== Provider.ID.openai) return
-        const url = new URL(evt.request.url)
-        evt.request.headers.set("originator", "opencode")
-        evt.request.headers.set("session-id", evt.sessionID)
-        if (url.origin !== "https://api.openai.com") return
-        evt.request = new Request(`${codexBaseURL}${url.pathname.replace(/^\/v1/, "")}${url.search}`, evt.request)
-      }),
-    )
-
     const refresh = () => loading.withPermit(load().pipe(Effect.andThen(ctx.catalog.reload())))
     yield* bus.subscribe(Integration.Event.ConnectionUpdated).pipe(
       Stream.filter((event) => event.data.integrationID === Integration.ID.make("openai")),

packages/core/src/plugin/websearch/index.ts

@@ -1,5 +1,11 @@
 import { WebSearchExa } from "./exa.js"
 import { WebSearchFirecrawl } from "./firecrawl.js"
 import { WebSearchParallel } from "./parallel.js"
+import { WebSearchTavily } from "./tavily.js"
 
-export const WebSearchPlugins = [WebSearchExa.Plugin, WebSearchFirecrawl.Plugin, WebSearchParallel.Plugin] as const
+export const WebSearchPlugins = [
+  WebSearchExa.Plugin,
+  WebSearchFirecrawl.Plugin,
+  WebSearchParallel.Plugin,
+  WebSearchTavily.Plugin,
+] as const

packages/core/src/plugin/websearch/tavily.ts

@@ -0,0 +1,85 @@
+export * as WebSearchTavily from "./tavily.js"
+
+import { define } from "@opencode-ai/plugin/effect/plugin"
+import { Duration, Effect, Schema, Scope } from "effect"
+import { HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
+import { App } from "../../app.js"
+
+export const endpoint = "https://api.tavily.com/search"
+
+const SearchRequest = Schema.Struct({
+  query: Schema.String,
+  search_depth: Schema.Literal("basic"),
+  chunks_per_source: Schema.Number,
+  max_results: Schema.Number,
+})
+
+const SearchResponse = Schema.Struct({
+  results: Schema.Array(
+    Schema.Struct({
+      title: Schema.String,
+      url: Schema.String,
+      content: Schema.String,
+    }),
+  ),
+})
+
+export const Plugin = define<HttpClient.HttpClient | Scope.Scope>({
+  id: "opencode.websearch.tavily",
+  effect: Effect.fn("WebSearchTavily.Plugin")(function* (ctx) {
+    const http = yield* HttpClient.HttpClient
+    yield* ctx.integration.transform((draft) => {
+      draft.update("tavily", (integration) => (integration.name = "Tavily"))
+      draft.method.update({
+        integrationID: "tavily",
+        method: { type: "key" },
+      })
+      draft.method.update({
+        integrationID: "tavily",
+        method: { type: "env", names: ["TAVILY_API_KEY"] },
+      })
+    })
+    yield* ctx.websearch.transform((draft) => {
+      draft.add({
+        id: "tavily",
+        name: "Tavily",
+        execute: (input) =>
+          Effect.gen(function* () {
+            const connection = yield* ctx.integration.connection.active("tavily")
+            const credential = connection ? yield* ctx.integration.connection.resolve(connection) : undefined
+            const request = yield* HttpClientRequest.post(endpoint).pipe(
+              HttpClientRequest.acceptJson,
+              HttpClientRequest.setHeaders({
+                "User-Agent": App.useragent(ctx.app),
+                "X-Client-Name": "opencode2",
+                ...(credential?.type === "key"
+                  ? { Authorization: `Bearer ${credential.key}` }
+                  : { "X-Tavily-Access-Mode": "keyless" }),
+              }),
+              HttpClientRequest.schemaBodyJson(SearchRequest)({
+                query: input.query,
+                search_depth: "basic",
+                chunks_per_source: 3,
+                max_results: 8,
+              }),
+            )
+            const response = yield* Effect.gen(function* () {
+              const httpResponse = yield* HttpClient.filterStatusOk(http).execute(request)
+              return yield* HttpClientResponse.schemaBodyJson(SearchResponse)(httpResponse)
+            }).pipe(
+              Effect.timeoutOrElse({
+                duration: Duration.seconds(25),
+                orElse: () => Effect.fail(new Error("Tavily web search request timed out")),
+              }),
+            )
+            return response.results.map((item) => ({
+              url: item.url,
+              title: item.title,
+              ...(item.content ? { content: item.content } : {}),
+              time: {},
+            }))
+          }),
+      })
+    })
+  }),
+})

packages/core/src/session.ts

@@ -1,7 +1,7 @@
 export * as Session from "./session.js"
 export * from "./session/schema.js"
 
-import { Effect, Layer, Schema, Context, Stream, Scope } from "effect"
+import { Effect, Layer, Schema, Context, RcMap, Stream, Scope } from "effect"
 import { ListAnchor } from "@opencode-ai/schema/session"
 import { and, asc, desc, eq, gt, isNull, like, lt, or, type SQL } from "drizzle-orm"
 import { Project } from "./project.js"
@@ -27,6 +27,7 @@ import { fromRow } from "./session/info.js"
 import { SessionRunner } from "./session/runner/index.js"
 import { SessionStore } from "./session/store.js"
 import { SessionExecution } from "./session/execution.js"
+import { SessionModelTransport } from "./session/model-transport.js"
 import { ForkEmptyError, MessageDecodeError, NotFoundError } from "./session/error.js"
 import { makeGlobalNode } from "@opencode-ai/util/effect/app-node"
 import { LocationServiceMap } from "./location-service-map.js"
@@ -306,6 +307,16 @@ const layer = Layer.effect(
     const scope = yield* Scope.Scope
     const activeShells = new Set<SessionSchema.ID>()
     const shellLocks = KeyedMutex.makeUnsafe<SessionSchema.ID>()
+    const closeTransport = Effect.fn("Session.closeTransport")(function* (session: SessionSchema.Info) {
+      const location = Location.Ref.make({
+        directory: session.location.directory,
+        workspaceID: session.location.workspaceID,
+      })
+      if (!(yield* RcMap.has(locations.rcMap, location))) return
+      yield* SessionModelTransport.Service.use((transport) => transport.close(session.id)).pipe(
+        Effect.provide(locations.get(location)),
+      )
+    })
     const decodeMessage = Schema.decodeUnknownEffect(SessionMessage.Info)
     const isDurableSessionEvent = Schema.is(SessionEvent.Durable)
     const persistProject = (project: Project.Resolved) => upsertProject(db, project).pipe(Effect.orDie)
@@ -437,9 +448,10 @@ const layer = Layer.effect(
         return session
       }),
       remove: Effect.fn("Session.remove")(function* (sessionID) {
-        yield* result.get(sessionID)
+        const session = yield* result.get(sessionID)
         yield* execution.interrupt(sessionID)
         yield* execution.awaitIdle(sessionID)
+        yield* closeTransport(session)
         const children = yield* result.list({ parentID: sessionID })
         yield* Effect.forEach(children.data, (child) => result.remove(child.id), { concurrency: 1, discard: true })
         yield* bus.publish(SessionEvent.Deleted, { sessionID })

packages/core/src/session/generate-node.ts

@@ -1,80 +1,54 @@
 export * as SessionGenerateNode from "./generate-node.js"
 
-import { LLM, LLMClient, Message, SystemPart } from "@opencode-ai/ai"
+import { LLMClient, Message } from "@opencode-ai/ai"
 import { Effect, Layer } from "effect"
 import { Database } from "../database/database.js"
 import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
-import { App } from "../app.js"
 import { llmClient } from "../effect/app-node-platform.js"
-import { PluginHooks } from "../plugin/hooks.js"
 import { SessionContext } from "./context.js"
 import { SessionGenerate } from "./generate.js"
 import { SessionHistory } from "./history.js"
-import { SessionModelHeaders } from "./model-headers.js"
-import { SessionPromptCacheKey } from "./prompt-cache-key.js"
+import { SessionModelRequest } from "./model-request.js"
 import { SessionRunnerModel } from "./runner/model.js"
-import PROMPT_DEFAULT from "./runner/prompt/base.txt"
-import { toLLMMessages } from "./runner/to-llm-message.js"
 
 export const layer = Layer.effect(
   SessionGenerate.Service,
   Effect.gen(function* () {
     const context = yield* SessionContext.Service
     const database = yield* Database.Service
-    const hooks = yield* PluginHooks.Service
     const llm = yield* LLMClient.Service
     const models = yield* SessionRunnerModel.Service
-    const app = yield* App.Metadata
+    const modelRequests = yield* SessionModelRequest.Service
 
     return SessionGenerate.Service.of({
       generate: Effect.fn("SessionGenerate.generate")(function* (input) {
         const selection = yield* context.select(input.sessionID)
         const model = yield* models.resolve(selection.session)
         const history = yield* SessionHistory.preview(database.db, selection.session.id, selection.instructions)
-        const providerMetadataKey = model.model.route.providerMetadataKey ?? model.model.provider
-        const tools = selection.tools
-        const toolDefinitions = tools.definitions
-        const toolsByName = new Map(toolDefinitions.map((tool) => [tool.name, tool]))
-        const contextEvent = yield* hooks.trigger("session", "context", {
-          sessionID: selection.session.id,
-          agent: selection.agent.id,
-          model: model.ref,
-          system: [selection.agent.info.system ? selection.agent.info.system : PROMPT_DEFAULT, history.initial]
-            .filter((part) => part.length > 0)
-            .map(SystemPart.make),
-          messages: [
-            ...toLLMMessages(history.messages, model.ref, providerMetadataKey),
-            ...(history.instructionUpdate ? [Message.system(history.instructionUpdate)] : []),
-            Message.user(input.prompt),
-          ],
-          tools: Object.fromEntries(
-            toolDefinitions.map((tool) => [
-              tool.name,
-              { description: tool.description, input: { ...tool.inputSchema } },
-            ]),
-          ),
+        const transcript = SessionModelRequest.baseTranscript({
+          agent: selection.agent.info,
+          model,
+          tools: selection.tools,
+          initial: history.initial,
+          messages: history.messages,
         })
-        const hookedTools = Object.entries(contextEvent.tools).flatMap(([name, tool]) => {
-          const registered = toolsByName.get(name)
-          return registered
-            ? [Object.assign({}, registered, { description: tool.description, inputSchema: tool.input })]
-            : []
+        const prepared = yield* modelRequests.prepare({
+          scope: { session: selection.session, agentID: selection.agent.id, model, tools: selection.tools },
+          transcript: {
+            system: transcript.system,
+            messages: [
+              ...transcript.messages,
+              ...(history.instructionUpdate ? [Message.system(history.instructionUpdate)] : []),
+              Message.user(input.prompt),
+            ],
+          },
         })
         yield* Effect.logInfo("sending session generation request", {
           sessionID: selection.session.id,
           providerID: model.ref.providerID,
           modelID: model.ref.id,
         })
-        const response = yield* llm.generate(
-          LLM.request({
-            model: model.model,
-            http: { headers: SessionModelHeaders.make(selection.session, app) },
-            promptCacheKey: SessionPromptCacheKey.make(selection.session.id),
-            system: contextEvent.system,
-            messages: contextEvent.messages,
-            tools: hookedTools,
-          }),
-        )
+        const response = yield* llm.generate(prepared.request, prepared.options)
         yield* Effect.logInfo("session generation usage diagnostic", { usage: response.usage })
         return response.text
       }),
@@ -85,5 +59,5 @@ export const layer = Layer.effect(
 export const node = makeLocationNode({
   service: SessionGenerate.Service,
   layer,
-  deps: [SessionContext.node, Database.node, PluginHooks.node, SessionRunnerModel.node, App.node, llmClient],
+  deps: [SessionContext.node, Database.node, SessionModelRequest.node, SessionRunnerModel.node, llmClient],
 })

packages/core/src/session/model-request.ts

@@ -3,23 +3,25 @@ export * as SessionModelRequest from "./model-request.js"
 import { LLM, Message, SystemPart, type LLMRequest } from "@opencode-ai/ai"
 import type { StreamOptions } from "@opencode-ai/ai/route"
 import type { Content } from "@opencode-ai/schema/tool"
-import { SessionError } from "@opencode-ai/schema/session-error"
 import { Cause, Config, Context, Effect, Layer, Result } from "effect"
 import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
 import { App } from "../app.js"
 import { Model } from "../model.js"
+import { Provider } from "../provider.js"
 import { Permission } from "../permission.js"
 import { PluginHooks } from "../plugin/hooks.js"
 import { QuestionTool } from "../tool/plugin/question.js"
 import { Tool } from "../tool.js"
-import { SessionContext } from "./context.js"
 import { SessionModelHeaders } from "./model-headers.js"
 import { SessionModelHttp } from "./model-http.js"
+import { SessionModelTransport } from "./model-transport.js"
 import { SessionPromptCacheKey } from "./prompt-cache-key.js"
-import { PromptCacheDiagnostics } from "./prompt-cache-diagnostics.js"
-import { MAX_STEPS_PROMPT } from "./runner/max-steps.js"
-import PROMPT_DEFAULT from "./runner/prompt/base.txt"
+import { SessionRunnerModel } from "./runner/model.js"
+import { SessionSchema } from "./schema.js"
+import { SessionSystemPrompt } from "./system-prompt.js"
 import { toLLMMessages } from "./runner/to-llm-message.js"
+import type { SessionMessage } from "./message.js"
+import type { Agent } from "../agent.js"
 
 const IMAGE_BYTES_TRIGGER = 25 * 1024 * 1024 // 25 MiB
 const IMAGE_BYTES_TARGET = 15 * 1024 * 1024 // 15 MiB
@@ -47,17 +49,48 @@ interface Prepared {
   readonly request: LLMRequest
   readonly options: StreamOptions
   /**
-   * One request-scoped execution operation. Unknown, hook-removed, and
-   * step-limit-violating calls fail individually through the same seam.
+   * One request-scoped execution operation. Unknown and hook-removed calls
+   * fail individually through the same seam.
    */
   readonly executeTool: (input: Parameters<Tool.Snapshot["execute"]>[0]) => Effect.Effect<Tool.Result, ExecuteError>
-  /** True when this request is the final Step; violating calls are rejected and no continuation follows. */
-  readonly stepLimitReached: boolean
 }
 
 interface PrepareInput {
-  readonly context: SessionContext.Loaded
-  readonly step: number
+  readonly scope: {
+    readonly session: SessionSchema.Info
+    readonly agentID: Agent.ID
+    readonly model: SessionRunnerModel.Resolved
+    readonly tools: Tool.Snapshot
+  }
+  readonly transcript: {
+    readonly system: Array<SystemPart>
+    readonly messages: Array<Message>
+  }
+  readonly toolChoice?: LLM.RequestInput["toolChoice"]
+  /** Stateful Session WebSocket channels require an explicit durable-runner opt-in. */
+  readonly webSocket?: "session"
+}
+
+export const baseTranscript = (input: {
+  readonly agent: Agent.Info
+  readonly model: SessionRunnerModel.Resolved
+  readonly tools: Tool.Snapshot
+  readonly initial: string
+  readonly messages: ReadonlyArray<SessionMessage.Info>
+}) => {
+  const providerMetadataKey = input.model.model.route.providerMetadataKey ?? input.model.model.provider
+  return {
+    providerMetadataKey,
+    system: [
+      input.agent.system
+        ? input.agent.system
+        : SessionSystemPrompt.make(input.tools.definitions.map((tool) => tool.name)),
+      input.initial,
+    ]
+      .filter((part) => part.length > 0)
+      .map(SystemPart.make),
+    messages: toLLMMessages(input.messages, input.model.ref, providerMetadataKey),
+  }
 }
 
 const mimeToModality = (mime: string) => {
@@ -165,28 +198,17 @@ export const layer = Layer.effect(
   Service,
   Effect.gen(function* () {
     const hooks = yield* PluginHooks.Service
+    const transport = yield* SessionModelTransport.Service
     const app = yield* App.Metadata
-    const diagnostics = yield* Config.boolean("OPENCODE_PROMPT_CACHE_DIAGNOSTICS").pipe(
+    const webSocket = yield* Config.boolean("OPENCODE_EXPERIMENTAL_OPENAI_RESPONSES_WEBSOCKET").pipe(
       Config.withDefault(false),
       Effect.orDie,
     )
-    const promptCacheSnapshots = diagnostics ? new Map<string, PromptCacheDiagnostics.Snapshot>() : undefined
-
     const prepare = Effect.fn("SessionModelRequest.prepare")(function* (input: PrepareInput) {
-      const session = input.context.session
-      const agent = input.context.agent
-      const resolved = input.context.model
+      const session = input.scope.session
+      const resolved = input.scope.model
       const model = resolved.model
-      const providerMetadataKey = model.route.providerMetadataKey ?? model.provider
-      const stepLimitReached = agent.info.steps !== undefined && input.step >= agent.info.steps
-      // The final Step keeps definitions available to protocols with native "none",
-      // preserving their prompt cache prefix. Calls are still rejected at execution.
-      const tools = input.context.tools
-      const system = [agent.info.system ? agent.info.system : PROMPT_DEFAULT, input.context.initial]
-        .filter((part) => part.length > 0)
-        .map(SystemPart.make)
-      const history = toLLMMessages(input.context.messages, resolved.ref, providerMetadataKey)
-      const messages = stepLimitReached ? [...history, Message.assistant(MAX_STEPS_PROMPT)] : history
+      const tools = input.scope.tools
       const registry = new Map(tools.definitions.map((tool) => [tool.name, tool]))
       // The definition objects we hand to hooks, mapped back to their tools. Hooks rename a
       // tool by moving its definition to a new key; recognizing the object recovers the tool.
@@ -198,10 +220,10 @@ export const layer = Layer.effect(
       // Hooks mutate this record in place: edit descriptions and schemas, rename, or remove.
       const context = yield* hooks.trigger("session", "context", {
         sessionID: session.id,
-        agent: agent.id,
+        agent: input.scope.agentID,
         model: resolved.ref,
-        system,
-        messages,
+        system: input.transcript.system,
+        messages: input.transcript.messages,
         tools: Object.fromEntries(Array.from(given, ([definition, tool]) => [tool.name, definition])),
       })
       // Match each surviving entry back to its tool, by recognizing a moved definition or
@@ -224,34 +246,28 @@ export const layer = Layer.effect(
         system: context.system,
         messages: boundImages(unsupportedParts(context.messages, resolved.capabilities)),
         tools: Array.from(hooked, ([name, tool]) => ({ ...tool, name })),
-        toolChoice: stepLimitReached ? "none" : undefined,
+        toolChoice: input.toolChoice,
       })
-      const options: StreamOptions = {
-        http: SessionModelHttp.middleware(hooks, {
-          sessionID: session.id,
-          agent: agent.id,
-          model: resolved.ref,
-        }),
-      }
-      if (promptCacheSnapshots) {
-        const current = PromptCacheDiagnostics.snapshot(request)
-        const comparison = PromptCacheDiagnostics.compare(promptCacheSnapshots.get(session.id), current)
-        promptCacheSnapshots.delete(session.id)
-        promptCacheSnapshots.set(session.id, current)
-        const oldest = promptCacheSnapshots.keys().next().value
-        if (promptCacheSnapshots.size > 100 && oldest !== undefined) promptCacheSnapshots.delete(oldest)
-        yield* Effect.logInfo("prompt cache prefix").pipe(
-          Effect.annotateLogs({
+      const webSocketEligible =
+        !(yield* hooks.has("session", "http.request")) && !(yield* hooks.has("session", "http.response"))
+      const http = webSocketEligible
+        ? undefined
+        : SessionModelHttp.middleware(hooks, {
             sessionID: session.id,
-            toolCount: current.tools.length,
-            systemParts: current.system.length,
-            messageCount: current.messages.length,
-            ...comparison,
-          }),
-        )
+            agent: input.scope.agentID,
+            model: resolved.ref,
+          })
+      const options: StreamOptions = {
+        ...(http ? { http } : {}),
+        ...(input.webSocket === "session" &&
+        webSocket &&
+        webSocketEligible &&
+        resolved.ref.providerID === Provider.ID.openai &&
+        model.route.id === "openai-responses"
+          ? { webSocket: transport.bind(session.id) }
+          : {}),
       }
       const executeTool: Prepared["executeTool"] = (input) => {
-        if (stepLimitReached) return new Tool.Error({ message: "Tools are disabled after the maximum agent steps" })
         const tool = hooked.get(input.call.name)
         // A registered tool absent from the hooked set was removed or renamed by a hook.
         if (!tool && registry.has(input.call.name))
@@ -264,7 +280,6 @@ export const layer = Layer.effect(
         request,
         options,
         executeTool,
-        stepLimitReached,
       }
     })
 
@@ -275,5 +290,5 @@ export const layer = Layer.effect(
 export const node = makeLocationNode({
   service: Service,
   layer,
-  deps: [PluginHooks.node, App.node],
+  deps: [PluginHooks.node, SessionModelTransport.node, App.node],
 })

packages/core/src/session/model-transport.ts

@@ -0,0 +1,488 @@
+export * as SessionModelTransport from "./model-transport.js"
+
+import {
+  WebSocketTransport,
+  type ChannelObservation,
+  type ChannelCheckpoint,
+  type WebSocketChannelExchange,
+  type WebSocketChannelExecution,
+  type WebSocketChannelExecutor,
+  type WebSocketConnection,
+  type WebSocketConnector,
+} from "@opencode-ai/ai/route"
+import { AIError, TransportReason, type TransportOperation } from "@opencode-ai/ai"
+import { Hash } from "@opencode-ai/util/hash"
+import { Cause, Clock, Context, Effect, Fiber, Layer, Metric, Queue, Scope, Semaphore, Stream } from "effect"
+import { Socket } from "effect/unstable/socket"
+import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
+import { SessionSchema } from "./schema.js"
+import { webSocketConstructor } from "../effect/app-node-platform.js"
+
+const ROTATE_AFTER_MS = 55 * 60 * 1000
+const INBOUND_CAPACITY = 128
+const IDLE_TIMEOUT = "5 minutes"
+const events = Metric.counter("opencode_session_websocket_events_total", {
+  description: "Session WebSocket lifecycle events",
+  incremental: true,
+})
+const metric = (event: string, attributes: Record<string, string> = {}) =>
+  Metric.update(events.pipe(Metric.withAttributes({ event, ...attributes })), 1)
+
+type Delivery = "queued" | "connecting" | "ready" | "send-attempted" | "provider-observed" | "terminal"
+
+interface Active {
+  readonly queue: Queue.Queue<string, AIError>
+  readonly lifecycle: { delivery: Delivery }
+}
+
+interface Channel {
+  readonly affinity: string
+  readonly connection: WebSocketConnection
+  readonly openedAt: number
+  active?: Active
+  closing: boolean
+  poisoned: boolean
+  checkpoint?: ChannelCheckpoint
+  pending?: { readonly token: object; readonly checkpoint: ChannelCheckpoint }
+  reader?: Fiber.Fiber<unknown, unknown>
+}
+
+interface State {
+  readonly lock: Semaphore.Semaphore
+  closed: boolean
+  channel?: Channel
+}
+
+export interface Interface {
+  readonly bind: (sessionID: SessionSchema.ID) => WebSocketChannelExecutor
+  readonly close: (sessionID: SessionSchema.ID) => Effect.Effect<void>
+  readonly closeAll: Effect.Effect<void>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/SessionModelTransport") {}
+
+const transportError = (
+  method: string,
+  message: string,
+  input: {
+    readonly operation: TransportOperation
+    readonly url?: string
+    readonly code?: string
+    readonly phase?: TransportReason["phase"]
+    readonly delivery?: TransportReason["delivery"]
+  },
+) =>
+  new AIError({
+    module: "SessionModelTransport",
+    method,
+    reason: new TransportReason({ message, transport: "websocket", ...input }),
+  })
+
+const annotate = (
+  error: AIError,
+  input: { readonly phase: TransportReason["phase"]; readonly delivery: TransportReason["delivery"] },
+) => {
+  if (error.reason._tag !== "Transport") return error
+  return new AIError({
+    module: error.module,
+    method: error.method,
+    reason: new TransportReason({
+      message: error.reason.message,
+      transport: error.reason.transport,
+      operation: error.reason.operation,
+      code: error.reason.code,
+      url: error.reason.url,
+      http: error.reason.http,
+      recovery: error.reason.recovery,
+      ...input,
+    }),
+  })
+}
+
+const affinity = (exchange: WebSocketChannelExchange) =>
+  `${exchange.connect.url}:${Hash.sha256(JSON.stringify(Object.entries(exchange.connect.headers).sort(([a], [b]) => a.localeCompare(b))))}`
+
+const observationFrame = (observation: ChannelObservation) => {
+  if (observation.type === "frame" || observation.type === "completed" || observation.type === "incomplete")
+    return Effect.succeed(observation.frame)
+  return Effect.fail(observation.error)
+}
+
+const observationTerminal = (observation: ChannelObservation) => observation.type !== "frame"
+
+export const makeLayer = (connector: WebSocketConnector) =>
+  Layer.effect(
+    Service,
+    Effect.gen(function* () {
+      const scope = yield* Scope.Scope
+      const states = new Map<SessionSchema.ID, State>()
+      const state = (sessionID: SessionSchema.ID) => {
+        const current = states.get(sessionID)
+        if (current) return current
+        const created = { lock: Semaphore.makeUnsafe(1), closed: false }
+        states.set(sessionID, created)
+        return created
+      }
+
+      const closeChannel = Effect.fn("SessionModelTransport.closeChannel")(function* (owner: State, channel: Channel) {
+        if (owner.channel === channel) owner.channel = undefined
+        if (channel.closing) return
+        channel.closing = true
+        if (channel.reader) yield* Fiber.interrupt(channel.reader)
+        yield* channel.connection.close
+        if (channel.active)
+          Queue.failCauseUnsafe(
+            channel.active.queue,
+            Cause.fail(
+              transportError("close", "Session WebSocket closed", {
+                operation: "read",
+                code: "close",
+                phase: "close",
+                delivery:
+                  channel.active.lifecycle.delivery === "queued" ||
+                  channel.active.lifecycle.delivery === "connecting" ||
+                  channel.active.lifecycle.delivery === "ready"
+                    ? "not-sent"
+                    : channel.active.lifecycle.delivery === "provider-observed" ||
+                        channel.active.lifecycle.delivery === "terminal"
+                      ? "accepted"
+                      : "ambiguous",
+              }),
+            ),
+          )
+        yield* metric("close")
+      })
+
+      const poison = Effect.fn("SessionModelTransport.poison")(function* (
+        owner: State,
+        channel: Channel,
+        error: AIError,
+      ) {
+        channel.poisoned = true
+        if (owner.channel === channel) owner.channel = undefined
+        if (channel.closing) return
+        channel.closing = true
+        if (channel.active) Queue.failCauseUnsafe(channel.active.queue, Cause.fail(error))
+        yield* metric(
+          error.reason._tag === "Transport" && error.reason.code === "queue-overflow"
+            ? "queue_overflow"
+            : "protocol_failure",
+        )
+        yield* channel.connection.close
+      })
+
+      const open = Effect.fn("SessionModelTransport.open")(function* (
+        owner: State,
+        exchange: WebSocketChannelExchange,
+        key: string,
+      ) {
+        return yield* Effect.uninterruptibleMask((restore) =>
+          Effect.gen(function* () {
+            const connection = yield* restore(
+              connector.open(exchange.connect).pipe(Effect.withSpan("SessionModelTransport.connect")),
+            )
+            if (owner.closed) {
+              yield* connection.close
+              return yield* transportError("open", "Session WebSocket owner closed while connecting", {
+                operation: "request",
+                code: "owner-closed",
+                phase: "connect",
+                delivery: "not-sent",
+              })
+            }
+            const channel: Channel = {
+              affinity: key,
+              connection,
+              openedAt: yield* Clock.currentTimeMillis,
+              closing: false,
+              poisoned: false,
+            }
+            owner.channel = channel
+            channel.reader = yield* connection.messages.pipe(
+              Stream.runForEach((message) =>
+                Effect.gen(function* () {
+                  const active = channel.active
+                  if (!active)
+                    return yield* transportError("receive", "WebSocket data arrived without an active exchange", {
+                      url: exchange.connect.url,
+                      operation: "read",
+                      code: "idle-data",
+                      phase: "receive",
+                    })
+                  active.lifecycle.delivery = "provider-observed"
+                  if (typeof message !== "string")
+                    return yield* transportError("receive", "Unsupported binary WebSocket frame", {
+                      url: exchange.connect.url,
+                      operation: "read",
+                      code: "message",
+                      phase: "receive",
+                    })
+                  if (Queue.offerUnsafe(active.queue, message)) return undefined
+                  return yield* transportError("receive", "Session WebSocket inbound queue overflow", {
+                    url: exchange.connect.url,
+                    operation: "read",
+                    code: "queue-overflow",
+                    phase: "receive",
+                    delivery: "accepted",
+                  })
+                }),
+              ),
+              Effect.catch((error) =>
+                channel.closing
+                  ? Effect.void
+                  : poison(
+                      owner,
+                      channel,
+                      annotate(error, {
+                        phase:
+                          error.reason._tag === "Transport" && error.reason.phase === "close" ? "close" : "receive",
+                        delivery:
+                          channel.active?.lifecycle.delivery === "provider-observed" ||
+                          channel.active?.lifecycle.delivery === "terminal" ||
+                          (error.reason._tag === "Transport" && error.reason.code === "queue-overflow")
+                            ? "accepted"
+                            : "ambiguous",
+                      }),
+                    ),
+              ),
+              Effect.forkIn(scope, { startImmediately: true }),
+            )
+            yield* Effect.logDebug("session websocket connected", {
+              sessionTransport: "websocket",
+              phase: "connect",
+            })
+            yield* metric("connect")
+            return channel
+          }),
+        )
+      })
+
+      const fallback = (exchange: WebSocketChannelExchange): WebSocketChannelExecution => ({
+        frames: exchange.fallback(),
+        complete: Effect.void,
+      })
+
+      const start = Effect.fn("SessionModelTransport.start")(function* (
+        owner: State,
+        exchange: WebSocketChannelExchange,
+        lifecycle: { delivery: Delivery },
+      ) {
+        if (owner.closed)
+          return yield* transportError("start", "Session WebSocket owner is closed", {
+            operation: "request",
+            code: "owner-closed",
+            phase: "queue",
+            delivery: "not-sent",
+          })
+        const key = affinity(exchange)
+        const now = yield* Clock.currentTimeMillis
+        const current = owner.channel
+        const rotateAfterMs = exchange.connect.rotateAfterMs ?? ROTATE_AFTER_MS
+        const rotation = current
+          ? current.poisoned
+            ? "poisoned"
+            : current.affinity !== key
+              ? "affinity"
+              : now - current.openedAt >= rotateAfterMs
+                ? "age"
+                : undefined
+          : undefined
+        if (current && rotation) {
+          yield* Effect.logDebug("session websocket rotating", {
+            sessionTransport: "websocket",
+            phase: "connect",
+            reason: rotation,
+          })
+          yield* metric("rotation", { reason: rotation })
+          yield* metric("reconnect")
+          yield* closeChannel(owner, current)
+        }
+
+        lifecycle.delivery = owner.channel ? "ready" : "connecting"
+        if (owner.channel)
+          yield* Effect.logDebug("session websocket reused", {
+            sessionTransport: "websocket",
+            phase: "connect",
+          })
+        if (owner.channel) yield* metric("reuse")
+        const channel = owner.channel
+          ? owner.channel
+          : yield* open(owner, exchange, key).pipe(
+              Effect.catch((error) =>
+                error.reason._tag === "Transport" && error.reason.code === "owner-closed"
+                  ? Effect.fail(error)
+                  : Effect.logWarning("session websocket connect failed; using http", {
+                      sessionTransport: "websocket",
+                      phase: "connect",
+                      delivery: "not-sent",
+                      code: error.reason._tag === "Transport" ? error.reason.code : error.reason._tag,
+                    }).pipe(
+                      Effect.andThen(metric("connect_failure")),
+                      Effect.andThen(metric("fallback")),
+                      Effect.andThen(Effect.succeed(undefined)),
+                    ),
+              ),
+            )
+        if (!channel) return fallback(exchange)
+        lifecycle.delivery = "ready"
+
+        if (channel.pending) {
+          channel.pending = undefined
+          channel.checkpoint = undefined
+        }
+
+        const create = yield* exchange.driver.create(channel.checkpoint).pipe(
+          Effect.tapError(() => closeChannel(owner, channel)),
+          Effect.onInterrupt(() => closeChannel(owner, channel)),
+        )
+        if (create.mode === "full") channel.checkpoint = undefined
+        const active: Active = { queue: yield* Queue.bounded<string, AIError>(INBOUND_CAPACITY), lifecycle }
+        channel.active = active
+        lifecycle.delivery = "send-attempted"
+        const sent = yield* channel.connection.sendText(create.message).pipe(
+          Effect.withSpan("SessionModelTransport.send"),
+          Effect.onInterrupt(() => closeChannel(owner, channel)),
+          Effect.result,
+        )
+        if (sent._tag === "Failure") {
+          const failure = sent.failure
+          const notSent = failure.reason._tag === "Transport" && failure.reason.delivery === "not-sent"
+          yield* closeChannel(owner, channel)
+          if (notSent) {
+            yield* metric("fallback")
+            return fallback(exchange)
+          }
+          yield* metric("ambiguous_delivery")
+          return yield* annotate(failure, { phase: "send", delivery: "ambiguous" })
+        }
+        yield* metric("send")
+
+        let terminal: ChannelObservation | undefined
+        const token = {}
+        let staged: ChannelCheckpoint | undefined
+        const frames = Stream.fromQueue(active.queue).pipe(
+          Stream.timeoutOrElse({
+            duration: IDLE_TIMEOUT,
+            orElse: () =>
+              Stream.fail(
+                transportError("receive", "Timed out waiting for WebSocket data", {
+                  url: exchange.connect.url,
+                  operation: "read",
+                  code: "idle-timeout",
+                  phase: "receive",
+                  delivery: lifecycle.delivery === "provider-observed" ? "accepted" : "ambiguous",
+                }),
+              ),
+          }),
+          Stream.mapEffect((frame) => exchange.driver.observe(create, frame)),
+          Stream.tap((observation) =>
+            Effect.sync(() => {
+              if (!observationTerminal(observation)) return
+              terminal = observation
+              lifecycle.delivery = "terminal"
+              staged = observation.type === "completed" ? observation.checkpoint : undefined
+              if (staged) channel.pending = { token, checkpoint: staged }
+              if (observation.type !== "completed" || !staged) channel.checkpoint = undefined
+            }),
+          ),
+          Stream.takeUntil(observationTerminal),
+          Stream.mapEffect(observationFrame),
+          Stream.ensuring(
+            Effect.gen(function* () {
+              if (channel.active === active) channel.active = undefined
+              const pending = yield* Queue.size(active.queue)
+              yield* Queue.shutdown(active.queue)
+              if (terminal && pending === 0) {
+                yield* metric("terminal", { type: terminal.type })
+                if (terminal.type === "rejected") yield* metric("rejection", { recovery: terminal.recovery })
+                if (terminal.type === "rejected" && terminal.recovery === "rotate-and-retry-full")
+                  yield* closeChannel(owner, channel)
+                return
+              }
+              yield* metric("cancellation")
+              channel.checkpoint = undefined
+              channel.pending = undefined
+              const error = terminal
+                ? transportError("receive", "WebSocket data arrived after the terminal event", {
+                    url: exchange.connect.url,
+                    operation: "read",
+                    code: "idle-data",
+                    phase: "receive",
+                    delivery: "accepted",
+                  })
+                : transportError("execute", "Session WebSocket exchange did not reach a terminal event", {
+                    url: exchange.connect.url,
+                    operation: "read",
+                    code: "incomplete",
+                    phase: "receive",
+                    delivery: lifecycle.delivery === "provider-observed" ? "accepted" : "ambiguous",
+                  })
+              yield* poison(owner, channel, error)
+            }),
+          ),
+        )
+        const complete = Effect.sync(() => {
+          if (owner.channel !== channel || channel.pending?.token !== token) return
+          channel.checkpoint = channel.pending.checkpoint
+          channel.pending = undefined
+        })
+        return { frames, complete }
+      })
+
+      const bind = (sessionID: SessionSchema.ID): WebSocketChannelExecutor => ({
+        execute: (exchange) => {
+          const owner = state(sessionID)
+          const lifecycle = { delivery: "queued" as Delivery }
+          let complete = Effect.void
+          return Effect.succeed({
+            frames: Stream.unwrap(
+              Effect.acquireRelease(owner.lock.take(1), () => owner.lock.release(1), { interruptible: true }).pipe(
+                Effect.andThen(start(owner, exchange, lifecycle)),
+                Effect.tap((execution) =>
+                  Effect.sync(() => {
+                    complete = execution.complete
+                  }),
+                ),
+                Effect.map((execution) => execution.frames),
+              ),
+            ),
+            complete: Effect.suspend(() => complete),
+          })
+        },
+      })
+
+      const close = Effect.fn("SessionModelTransport.close")(function* (sessionID: SessionSchema.ID) {
+        const owner = states.get(sessionID)
+        if (!owner) return
+        states.delete(sessionID)
+        owner.closed = true
+        if (owner.channel) yield* closeChannel(owner, owner.channel)
+      })
+      const closeAll = Effect.suspend(() => {
+        const owners = Array.from(states.values())
+        states.clear()
+        return Effect.forEach(
+          owners,
+          (owner) => {
+            owner.closed = true
+            return owner.channel ? closeChannel(owner, owner.channel) : Effect.void
+          },
+          { discard: true },
+        )
+      })
+
+      yield* Effect.addFinalizer(() => closeAll)
+      return Service.of({ bind, close, closeAll })
+    }),
+  )
+
+export const layer = Layer.unwrap(
+  Effect.map(Socket.WebSocketConstructor, (constructor) =>
+    makeLayer({
+      open: (input) =>
+        WebSocketTransport.open(input).pipe(Effect.provideService(Socket.WebSocketConstructor, constructor)),
+    }),
+  ),
+)
+
+export const node = makeLocationNode({ service: Service, layer, deps: [webSocketConstructor] })

packages/core/src/session/runner/llm.ts

@@ -4,11 +4,12 @@ import {
   LLMClient,
   AIError,
   LLMEvent,
+  Message,
   isContextOverflowFailure,
   type ProviderErrorEvent,
   type ToolCall,
 } from "@opencode-ai/ai"
-import { Cause, Data, Effect, Exit, Fiber, FiberSet, Layer, Option, Pull, Schedule, Stream } from "effect"
+import { Cause, Config, Data, Effect, Exit, Fiber, FiberSet, Layer, Option, Pull, Schedule, Stream } from "effect"
 import { Database } from "../../database/database.js"
 import { Bus } from "../../bus.js"
 import { Permission } from "../../permission.js"
@@ -19,6 +20,7 @@ import { SessionContext } from "../context.js"
 import { SessionEvent } from "../event.js"
 import { SessionInbox } from "../inbox.js"
 import { SessionModelRequest } from "../model-request.js"
+import { SessionModelTransport } from "../model-transport.js"
 import { SessionMessage } from "../message.js"
 import { SessionSchema } from "../schema.js"
 import { SessionStore } from "../store.js"
@@ -33,8 +35,11 @@ import { toSessionError } from "../to-session-error.js"
 import { SessionRunnerRetry } from "./retry.js"
 import { SessionUsage } from "../usage.js"
 import { ToolOutput } from "../../tool-output.js"
+import { Tool } from "../../tool.js"
+import { PromptCacheDiagnostics } from "../prompt-cache-diagnostics.js"
+import { MAX_STEPS_PROMPT } from "./max-steps.js"
 
-/** How one model call ended: settled, awaiting a scheduled retry, or restarted by compaction. */
+/** How one model call ended: settled, awaiting retry/recovery, or restarted by compaction. */
 type CallOutcome = Data.TaggedEnum<{
   Completed: { readonly needsContinuation: boolean; readonly step: number }
   Retry: { readonly step: number }
@@ -43,6 +48,7 @@ type CallOutcome = Data.TaggedEnum<{
     readonly error: SessionRunnerRetry.RetryableFailure["error"]
     readonly step: number
   }
+  RecoverFull: { readonly step: number }
   Restart: { readonly step: number; readonly recoveredOverflow: boolean }
 }>
 const CallOutcome = Data.taggedEnum<CallOutcome>()
@@ -108,11 +114,38 @@ const layer = Layer.effect(
     const store = yield* SessionStore.Service
     const context = yield* SessionContext.Service
     const modelRequests = yield* SessionModelRequest.Service
+    const modelTransport = yield* SessionModelTransport.Service
     const snapshots = yield* Snapshot.Service
     const db = (yield* Database.Service).db
     const compaction = yield* SessionCompaction.Service
     const title = yield* SessionTitle.Service
     const toolOutput = yield* ToolOutput.Service
+    const diagnostics = yield* Config.boolean("OPENCODE_PROMPT_CACHE_DIAGNOSTICS").pipe(
+      Config.withDefault(false),
+      Effect.orDie,
+    )
+    const promptCacheSnapshots = diagnostics ? new Map<string, PromptCacheDiagnostics.Snapshot>() : undefined
+    const diagnosePromptCache = Effect.fn("SessionRunner.diagnosePromptCache")(function* (
+      sessionID: SessionSchema.ID,
+      request: Parameters<typeof PromptCacheDiagnostics.snapshot>[0],
+    ) {
+      if (!promptCacheSnapshots) return
+      const current = PromptCacheDiagnostics.snapshot(request)
+      const comparison = PromptCacheDiagnostics.compare(promptCacheSnapshots.get(sessionID), current)
+      promptCacheSnapshots.delete(sessionID)
+      promptCacheSnapshots.set(sessionID, current)
+      const oldest = promptCacheSnapshots.keys().next().value
+      if (promptCacheSnapshots.size > 100 && oldest !== undefined) promptCacheSnapshots.delete(oldest)
+      yield* Effect.logInfo("prompt cache prefix").pipe(
+        Effect.annotateLogs({
+          sessionID,
+          toolCount: current.tools.length,
+          systemParts: current.system.length,
+          messageCount: current.messages.length,
+          ...comparison,
+        }),
+      )
+    })
     // Title generation starts once input is visible and must not delay model execution.
     // The in-flight set coalesces overlapping prompts while title presence records success durably.
     const titlesRunning = new Set<SessionSchema.ID>()
@@ -205,12 +238,15 @@ const layer = Layer.effect(
       let currentStep = step
       // Overflow recovery is one-shot: a call after recovery must not recover another overflow.
       let recoverOverflow = true
+      // Continuation rejection permits one immediate full-context Physical Attempt without generic backoff.
+      let recoverContinuation = true
       while (true) {
         const outcome = yield* callModel(
           sessionID,
           currentPromotable,
           currentStep,
           recoverOverflow,
+          recoverContinuation,
           assistantMessageID,
         ).pipe(Effect.catchTag("SessionRunner.RetryableFailure", waitForRetry))
         if (outcome._tag === "Completed") return { needsContinuation: outcome.needsContinuation, step: outcome.step }
@@ -232,6 +268,7 @@ const layer = Layer.effect(
           if (outcome.recoveredOverflow) recoverOverflow = false
           assistantMessageID = SessionMessage.ID.create()
         }
+        if (outcome._tag === "RecoverFull") recoverContinuation = false
         // Neither a retry nor a compaction restart re-promotes input.
         currentPromotable = undefined
         currentStep = outcome.step
@@ -247,6 +284,7 @@ const layer = Layer.effect(
       promotable: SessionInbox.Promotable | undefined,
       step: number,
       recoverOverflow: boolean,
+      recoverContinuation: boolean,
       assistantMessageID: SessionMessage.ID,
     ) {
       const selected = yield* context.select(sessionID)
@@ -270,10 +308,32 @@ const layer = Layer.effect(
           return CallOutcome.Restart({ step: currentStep, recoveredOverflow: false })
         return yield* new StepFailedError({ error: compacted.error })
       }
-      const prepared = yield* modelRequests.prepare({
-        context: loaded,
-        step: currentStep,
+      const stepLimitReached = agent.info.steps !== undefined && currentStep >= agent.info.steps
+      const transcript = SessionModelRequest.baseTranscript({
+        agent: agent.info,
+        model: resolved,
+        tools: loaded.tools,
+        initial: loaded.initial,
+        messages: loaded.messages,
       })
+      const prepared = yield* modelRequests.prepare({
+        scope: { session, agentID: agent.id, model: resolved, tools: loaded.tools },
+        transcript: {
+          system: transcript.system,
+          messages: stepLimitReached
+            ? [...transcript.messages, Message.assistant(MAX_STEPS_PROMPT)]
+            : transcript.messages,
+        },
+        // The final Step keeps definitions available to protocols with native "none",
+        // preserving their prompt cache prefix. Calls are still rejected at execution.
+        toolChoice: stepLimitReached ? "none" : undefined,
+        webSocket: "session",
+      })
+      yield* diagnosePromptCache(session.id, prepared.request)
+      const executeTool = (input: Parameters<typeof prepared.executeTool>[0]) => {
+        if (stepLimitReached) return new Tool.Error({ message: "Tools are disabled after the maximum agent steps" })
+        return prepared.executeTool(input)
+      }
       // Every local tool call forked here is owned until it reaches one durable settlement.
       const toolRuns: Array<{
         readonly call: ToolCall
@@ -287,7 +347,7 @@ const layer = Layer.effect(
         // The selected catalog identity, not model.id: route-level ids are provider API
         // model ids (for example gpt-5.5-fast resolves to api id gpt-5.5).
         model: resolved.ref,
-        providerMetadataKey: model.route.providerMetadataKey ?? model.provider,
+        providerMetadataKey: transcript.providerMetadataKey,
         snapshot: startSnapshot,
         assistantMessageID,
       })
@@ -348,7 +408,7 @@ const layer = Layer.effect(
               call: event,
               fiber: yield* Effect.uninterruptibleMask((restore) =>
                 restore(
-                  prepared.executeTool({
+                  executeTool({
                     sessionID: session.id,
                     agent: agent.id,
                     messageID: assistantMessageID,
@@ -412,6 +472,13 @@ const layer = Layer.effect(
           // escapes as a scheduled retry or fails the assistant durably.
           const llmFailure = streamFailure instanceof AIError ? streamFailure : undefined
           const llmError = llmFailure && !publisher.record().providerFailed ? toSessionError(llmFailure) : undefined
+          if (
+            recoverContinuation &&
+            llmFailure?.reason._tag === "Transport" &&
+            (llmFailure.reason.recovery === "retry-full" || llmFailure.reason.recovery === "rotate-and-retry-full") &&
+            !publisher.record().outputStarted
+          )
+            return CallOutcome.RecoverFull({ step: currentStep })
           if (
             llmFailure &&
             llmError &&
@@ -489,7 +556,7 @@ const layer = Layer.effect(
             // A local call or malformed tool input requires another model step, unless
             // this step already exhausted the agent's allowance.
             needsContinuation:
-              !prepared.stepLimitReached &&
+              !stepLimitReached &&
               record.calls.some((call) => !call.providerExecuted && (call.called || call.settled)),
             step: currentStep,
           })
@@ -553,6 +620,7 @@ const layer = Layer.effect(
             (yield* SessionInbox.nextSteer(db, sessionID)) ??
             (promotable === "input" ? yield* SessionInbox.nextQueued(db, sessionID) : undefined)
           if (pending?.type !== "move") return false
+          yield* modelTransport.close(sessionID)
           yield* bus.publishAll([
             [SessionEvent.InboxDelivered, { sessionID, inboxID: pending.id }],
             [
@@ -623,6 +691,7 @@ export const node = makeLocationNode({
     llmClient,
     SessionContext.node,
     SessionModelRequest.node,
+    SessionModelTransport.node,
     SessionStore.node,
     SessionCompaction.node,
     SessionTitle.node,

packages/core/src/session/runner/prompt/base.txt

@@ -1,95 +0,0 @@
-You are opencode, an interactive CLI tool that helps users with software engineering tasks. Use the instructions below and the tools available to you to assist the user.
-
-IMPORTANT: You must NEVER generate or guess URLs for the user unless you are confident that the URLs are for helping the user with programming. You may use URLs provided by the user in their messages or local files.
-
-If the user asks for help or wants to give feedback inform them of the following:
-- /help: Get help with using opencode
-- To give feedback, users should report the issue at https://github.com/anomalyco/opencode/issues
-
-When the user directly asks about opencode (eg 'can opencode do...', 'does opencode have...') or asks in second person (eg 'are you able...', 'can you do...'), first use the webfetch tool to gather information to answer the question from opencode docs at https://opencode.ai/v2/docs/
-
-# Tone and style
-You should be concise, direct, and to the point. When you run a non-trivial shell command, you should explain what the command does and why you are running it, to make sure the user understands what you are doing (this is especially important when you are running a command that will make changes to the user's system).
-Remember that your output will be displayed on a command line interface. Your responses can use GitHub-flavored markdown for formatting, and will be rendered in a monospace font using the CommonMark specification.
-Output text to communicate with the user; all text you output outside of tool use is displayed to the user. Only use tools to complete tasks. Never use tools like the shell tool or code comments as means to communicate with the user during the session.
-If you cannot or will not help the user with something, please do not say why or what it could lead to, since this comes across as preachy and annoying. Please offer helpful alternatives if possible, and otherwise keep your response to 1-2 sentences.
-Only use emojis if the user explicitly requests it. Avoid using emojis in all communication unless asked.
-IMPORTANT: You should minimize output tokens as much as possible while maintaining helpfulness, quality, and accuracy. Only address the specific query or task at hand, avoiding tangential information unless absolutely critical for completing the request. If you can answer in 1-3 sentences or a short paragraph, please do.
-IMPORTANT: You should NOT answer with unnecessary preamble or postamble (such as explaining your code or summarizing your action), unless the user asks you to.
-IMPORTANT: Keep your responses short, since they will be displayed on a command line interface. You MUST answer concisely with fewer than 4 lines (not including tool use or code generation), unless user asks for detail. Answer the user's question directly, without elaboration, explanation, or details. One word answers are best. Avoid introductions, conclusions, and explanations. You MUST avoid text before/after your response, such as "The answer is <answer>.", "Here is the content of the file..." or "Based on the information provided, the answer is..." or "Here is what I will do next...". Here are some examples to demonstrate appropriate verbosity:
-<example>
-user: what is 2+2?
-assistant: 4
-</example>
-
-<example>
-user: is 11 a prime number?
-assistant: Yes
-</example>
-
-<example>
-user: what command should I run to list files in the current directory?
-assistant: ls
-</example>
-
-<example>
-user: what command should I run to watch files in the current directory?
-assistant: [use the read tool to list the files in the current directory, then read docs/commands in the relevant file to find out how to watch files]
-npm run dev
-</example>
-
-<example>
-user: what files are in the directory src/?
-assistant: [uses read and sees foo.c, bar.c, baz.c]
-user: which file contains the implementation of foo?
-assistant: src/foo.c
-</example>
-
-<example>
-user: write tests for new feature
-assistant: [uses grep and glob search tools to find where similar tests are defined, uses concurrent read file tool use blocks in one tool call to read relevant files at the same time, uses edit file tool to write new tests]
-</example>
-
-# Proactiveness
-You are allowed to be proactive, but only when the user asks you to do something. You should strive to strike a balance between:
-1. Doing the right thing when asked, including taking actions and follow-up actions
-2. Not surprising the user with actions you take without asking
-For example, if the user asks you how to approach something, you should do your best to answer their question first, and not immediately jump into taking actions.
-3. Do not add additional code explanation summary unless requested by the user. After working on a file, just stop, rather than providing an explanation of what you did.
-
-# Following conventions
-When making changes to files, first understand the file's code conventions. Mimic code style, use existing libraries and utilities, and follow existing patterns.
-- NEVER assume that a given library is available, even if it is well known. Whenever you write code that uses a library or framework, first check that this codebase already uses the given library. For example, you might look at neighboring files, or check the package.json (or cargo.toml, and so on depending on the language).
-- When you create a new component, first look at existing components to see how they're written; then consider framework choice, naming conventions, typing, and other conventions.
-- When you edit a piece of code, first look at the code's surrounding context (especially its imports) to understand the code's choice of frameworks and libraries. Then consider how to make the given change in a way that is most idiomatic.
-- Always follow security best practices. Never introduce code that exposes or logs secrets and keys. Never commit secrets or keys to the repository.
-
-# Code style
-- IMPORTANT: DO NOT ADD ***ANY*** COMMENTS unless asked
-
-# Doing tasks
-The user will primarily request you perform software engineering tasks. This includes solving bugs, adding new functionality, refactoring code, explaining code, and more. For these tasks the following steps are recommended:
-- Use the available search tools to understand the codebase and the user's query. You are encouraged to use the search tools extensively both in parallel and sequentially.
-- Implement the solution using all tools available to you
-- Verify the solution if possible with tests. NEVER assume specific test framework or test script. Check the README or search codebase to determine the testing approach.
-- VERY IMPORTANT: When you have completed a task, you MUST run the lint and typecheck commands (e.g. npm run lint, npm run typecheck, ruff, etc.) with the shell tool if they were provided to you to ensure your code is correct. If you are unable to find the correct command, ask the user for the command to run and if they supply it, proactively suggest writing it to AGENTS.md so that you will know to run it next time.
-NEVER commit changes unless the user explicitly asks you to. It is VERY IMPORTANT to only commit when explicitly asked, otherwise the user will feel that you are being too proactive.
-
-- Tool results and user messages may include <system-reminder> tags. <system-reminder> tags contain useful information and reminders. They are NOT part of the user's provided input or the tool result.
-
-# Tool usage policy
-- When doing file search, prefer to use the subagent tool in order to reduce context usage.
-- You have the capability to call multiple tools in a single response. When multiple independent pieces of information are requested, batch your tool calls together for optimal performance. When making multiple shell tool calls, you MUST send a single message with multiple tools calls to run the calls in parallel. For example, if you need to run "git status" and "git diff", send a single message with two tool calls to run the calls in parallel.
-
-You MUST answer concisely with fewer than 4 lines of text (not including tool use or code generation), unless user asks for detail.
-
-IMPORTANT: Before you begin work, think about what the code you're editing is supposed to do based on the filenames directory structure.
-
-# Code References
-
-When referencing specific functions or pieces of code include the pattern `file_path:line_number` to allow the user to easily navigate to the source code location.
-
-<example>
-user: Where are errors from the client handled?
-assistant: Clients are marked as failed in the `connectToServer` function in src/services/process.ts:712.
-</example>

packages/core/src/session/runner/prompt/system.txt

@@ -0,0 +1,14 @@
+You are an AI agent powered by OpenCode, a coding agent harness. Help the user accomplish their goals using the tools you have available.
+
+# Harness
+- Responses are rendered as GitHub-flavored Markdown.
+- `<system-reminder>` blocks are harness instructions, not user-authored content. Read and follow them.
+${OPENCODE_TOOL_GUIDANCE}
+
+# Communication
+- Use clear file paths when referring to files.
+- Keep responses clear and concise, and avoid unnecessary technical jargon.
+
+# Working in codebases
+- Keep changes consistent with the structure, naming, style, and patterns of the surrounding code.
+- Treat unfamiliar files or changes as potential user work and investigate before deleting or overwriting them.

packages/core/src/session/runner/retry.ts

@@ -18,8 +18,9 @@ export function isRetryable(error: AIError) {
   switch (error.reason._tag) {
     case "RateLimit":
     case "ProviderInternal":
-    case "Transport":
       return true
+    case "Transport":
+      return error.reason.delivery === undefined || error.reason.delivery === "not-sent"
     case "InvalidProviderOutput":
       return error.reason.classification === "incomplete-stream"
     case "Authentication":

packages/core/src/session/system-prompt.ts

@@ -0,0 +1,24 @@
+export * as SessionSystemPrompt from "./system-prompt.js"
+
+import PROMPT from "./runner/prompt/system.txt"
+
+export function make(tools: string[]) {
+  const instructions: string[] = []
+  if (tools.includes("write")) {
+    instructions.push(
+      "- Use the write tool to create files or completely replace their content. Prefer using the edit tool for targeted changes.",
+    )
+  }
+  if (tools.includes("edit")) {
+    instructions.push(
+      "- Use the edit tool for targeted changes to existing text files. It replaces the exact text in `oldString` with `newString`, and the values must differ. By default, `oldString` must occur exactly once. If it occurs multiple times, include more surrounding context to make it unique or set `replaceAll` to true to replace every occurrence.",
+    )
+  }
+  // if (tools.includes("patch")) {
+  //   // instructions.push(...)
+  // }
+  if (tools.includes("read")) {
+    instructions.push("- Prefer using the read tool rather than shell commands like `cat`.")
+  }
+  return PROMPT.replace("${OPENCODE_TOOL_GUIDANCE}", instructions.join("\n"))
+}

packages/core/src/shell/parse.ts

@@ -9,6 +9,7 @@ import { shellParserWasm } from "#shell-parser-wasm"
 import { ShellSelect } from "./select.js"
 
 type Part = { type: string; text: string }
+type SourceToken = { raw: string; value: string }
 const CWD = new Set(["cd", "chdir", "popd", "pushd", "push-location", "set-location"])
 const POWERSHELL_PATH_FLAGS = new Set(["-literalpath", "-path"])
 
@@ -152,7 +153,17 @@ const ARITY: Record<string, number> = {
   "yarn run": 3,
 }
 
-export const scan = Effect.fn("ShellParse.scan")(function* (command: string, shell: string, cwd: string) {
+export const scan = Effect.fn("ShellParse.scan")(function* (
+  command: string,
+  shell: string,
+  cwd: string,
+  options?: { portable?: boolean },
+) {
+  if (options?.portable) return yield* Effect.promise(() => scanPortable(command, shell, cwd))
+  return yield* scanLegacy(command, shell, cwd)
+})
+
+const scanLegacy = Effect.fn("ShellParse.scanLegacy")(function* (command: string, shell: string, cwd: string) {
   const parsers = yield* Effect.promise(load)
   const powershell = ShellSelect.ps(shell)
   const tree = (powershell ? parsers.ps : parsers.bash).parse(command)
@@ -186,6 +197,417 @@ export const scan = Effect.fn("ShellParse.scan")(function* (command: string, she
   )
 })
 
+async function scanPortable(command: string, shell: string, cwd: string) {
+  const { ShellScan } = await import("@opencode-ai/shell-scan")
+  const powershell = ShellSelect.ps(shell)
+  const result = powershell ? ShellScan.scanPowerShell(command) : ShellScan.scan(command)
+  if (result.kind === "opaque") return { commands: [{ resource: command, save: command }], directories: [] }
+  const carriage = powershell ? command.search(/\r(?!\n)/) : -1
+  if (carriage >= 0) return { commands: [], directories: [] }
+
+  const parsed = result.commands.reduce(
+    (output, item) => {
+      const index = item[ShellScan.Nested] ? -1 : command.indexOf(item.resource, output.cursor)
+      const offset = item[ShellScan.Nested]
+        ? command.lastIndexOf(item.resource, output.cursor - 1)
+        : index < 0
+          ? command.indexOf(item.resource)
+          : index
+      if (index >= 0) output.cursor = index + item.resource.length
+      const before = command.slice(0, Math.max(0, offset))
+      const name = powershell ? item.words[0]?.toLowerCase() : item.words[0]
+      if (!name) return output
+      if (powershell && name === "<") return output
+      if (
+        powershell &&
+        name === "foreach-object" &&
+        item.words.some((word) => word.startsWith("{")) &&
+        !/\|\s*$/.test(before)
+      )
+        return output
+      const tokens = powershell ? powerShellSourceTokens(item.resource) : sourceTokens(item.resource)
+      const sourceHead = powershell ? item.words[0] : tokens.find((token) => token.value === item.words[0])?.raw
+      if (CWD.has(name) && (powershell || sourceHead === item.words[0])) {
+        output.directories.push(...portableDirectoryArgs(item.words, tokens, powershell, cwd, shell))
+        return output
+      }
+      const save = powershell ? powerShellSourcePrefix(tokens, item.words) : bashSourcePrefix(tokens, item.words)
+      output.commands.push({
+        resource: powershell ? item.resource : bashResource(item.resource, before),
+        save: `${save} *`,
+      })
+      return output
+    },
+    {
+      commands: [] as Array<{ resource: string; save: string }>,
+      directories: [] as string[],
+      cursor: 0,
+    },
+  )
+  return { commands: parsed.commands, directories: parsed.directories }
+}
+
+function bashResource(resource: string, before: string) {
+  if (!/(?:&&|\|\||\|&)\s*$|\|\s*$/.test(before)) return resource
+  const redirect = bashRedirect(resource)
+  return redirect < 0 ? resource : resource.slice(0, redirect).replace(/\d+$/, "").trim()
+}
+
+function bashRedirect(resource: string) {
+  let quote: "single" | "double" | undefined
+  for (let index = 0; index < resource.length; index++) {
+    const char = resource[index]
+    if (quote === "single") {
+      if (char === "'") quote = undefined
+      continue
+    }
+    if (char === "\\") {
+      index++
+      continue
+    }
+    if (char === '"') {
+      quote = quote === "double" ? undefined : "double"
+      continue
+    }
+    if (quote === "double") {
+      if (char === "$" && resource[index + 1] === "(") index = bashParenthesizedEnd(resource, index + 1)
+      else if (char === "`") index = bashBacktickEnd(resource, index)
+      continue
+    }
+    if (char === "'") {
+      quote = "single"
+      continue
+    }
+    if ((char === "$" || char === "<" || char === ">") && resource[index + 1] === "(") {
+      index = bashParenthesizedEnd(resource, index + 1)
+      continue
+    }
+    if (char === "`") {
+      index = bashBacktickEnd(resource, index)
+      continue
+    }
+    if (char === "<" || char === ">" || (char === "&" && resource[index + 1] === ">")) return index
+  }
+  return -1
+}
+
+function bashParenthesizedEnd(resource: string, start: number) {
+  let level = 1
+  let quote: "single" | "double" | undefined
+  for (let index = start + 1; index < resource.length; index++) {
+    const char = resource[index]
+    if (quote === "single") {
+      if (char === "'") quote = undefined
+      continue
+    }
+    if (char === "\\") {
+      index++
+      continue
+    }
+    if (char === '"') {
+      quote = quote === "double" ? undefined : "double"
+      continue
+    }
+    if (quote === "double") continue
+    if (char === "'") {
+      quote = "single"
+      continue
+    }
+    if (char === "(") level++
+    if (char === ")" && --level === 0) return index
+  }
+  return resource.length - 1
+}
+
+function bashBacktickEnd(resource: string, start: number) {
+  for (let index = start + 1; index < resource.length; index++) {
+    if (resource[index] === "\\") index++
+    else if (resource[index] === "`") return index
+  }
+  return resource.length - 1
+}
+
+function portableDirectoryArgs(
+  command: string[],
+  tokens: SourceToken[],
+  powershell: boolean,
+  cwd: string,
+  shell: string,
+) {
+  if (!powershell) {
+    const start = tokens.findIndex((token) => token.value === command[0])
+    if (start < 0) return []
+    return directoryArgs(
+      tokens.slice(start).map((token) => ({ type: "word", text: token.raw })),
+      false,
+      cwd,
+      shell,
+    )
+  }
+
+  const start = tokens.findIndex((token) => token.value.toLowerCase() === command[0]?.toLowerCase())
+  if (start < 0) return []
+  const directories: string[] = []
+  let expectsPath = false
+  for (const part of tokens.slice(start + 1).map((token) => token.raw)) {
+    if (expectsPath) {
+      const value = directoryArgument(part, true, cwd, shell)
+      if (value) directories.push(value)
+      expectsPath = false
+      continue
+    }
+    if (part.startsWith("-")) {
+      expectsPath = POWERSHELL_PATH_FLAGS.has(part.toLowerCase())
+      continue
+    }
+    const value = directoryArgument(part, true, cwd, shell)
+    if (value) directories.push(value)
+  }
+  return directories
+}
+
+function sourceTokens(resource: string) {
+  const tokens: SourceToken[] = []
+  let raw = ""
+  let value = ""
+  let quote: "single" | "double" | "backtick" | undefined
+  let substitution = 0
+  let redirect = false
+
+  const finish = () => {
+    if (!raw) return
+    if (!redirect) tokens.push({ raw, value })
+    raw = ""
+    value = ""
+    redirect = false
+  }
+
+  for (let index = 0; index < resource.length; index++) {
+    const char = resource[index]
+    if (quote === "single") {
+      raw += char
+      if (char === "'") quote = undefined
+      else value += char
+      continue
+    }
+    if (quote === "double") {
+      raw += char
+      if (char === '"') quote = undefined
+      else if (char === "\\" && index + 1 < resource.length) {
+        const next = resource[index + 1]
+        if ('$`"\\\n'.includes(next)) {
+          raw += resource[++index]
+          if (next !== "\n") value += next
+        } else value += char
+      } else value += char
+      continue
+    }
+    if (quote === "backtick") {
+      raw += char
+      value += char
+      if (char === "`" && resource[index - 1] !== "\\") quote = undefined
+      continue
+    }
+    if (char === "'") {
+      raw += char
+      quote = "single"
+      continue
+    }
+    if (char === '"') {
+      raw += char
+      quote = "double"
+      continue
+    }
+    if (char === "`") {
+      raw += char
+      value += char
+      quote = "backtick"
+      continue
+    }
+    if (char === "\\" && index + 1 < resource.length) {
+      if (resource[index + 1] === "\n") {
+        finish()
+        index++
+        continue
+      }
+      if (!raw && /\s/.test(resource[index + 1])) {
+        index++
+        continue
+      }
+      raw += char + resource[++index]
+      value += resource[index]
+      continue
+    }
+    if ((char === "<" || char === ">") && resource[index + 1] === "(") {
+      const end = bashParenthesizedEnd(resource, index + 1)
+      if (raw) {
+        raw += resource.slice(index, end + 1)
+        value += resource.slice(index, end + 1)
+      }
+      index = end
+      continue
+    }
+    if (char === "$" && resource[index + 1] === "(") substitution++
+    if (char === ")" && substitution > 0) substitution--
+    if (substitution === 0 && /\s/.test(char)) {
+      finish()
+      continue
+    }
+    if (substitution === 0 && (char === "<" || char === ">" || (char === "&" && resource[index + 1] === ">"))) {
+      if (/^\d+$/.test(value)) {
+        raw = ""
+        value = ""
+      } else finish()
+      redirect = true
+      if (char === "&") index++
+      while (/[<>&|]/.test(resource[index + 1] ?? "")) index++
+      continue
+    }
+    raw += char
+    value += char
+  }
+  finish()
+
+  return tokens
+}
+
+function bashSourcePrefix(tokens: SourceToken[], words: string[]) {
+  const start = tokens.findIndex((token) => token.value === words[0])
+  if (start < 0) {
+    const command = tokens.findIndex((token) => !/^[A-Za-z_][A-Za-z0-9_]*\+?=/.test(token.raw))
+    return prefix(tokens.slice(Math.max(0, command)).map((token) => token.raw)).join(" ")
+  }
+  const source = tokens
+    .slice(start)
+    .map((token) => token.raw)
+    .filter((token) => !/^\$\([\s\S]*\)$/.test(token) && !/^`[\s\S]*`$/.test(token))
+  return prefix(source).join(" ")
+}
+
+function powerShellSourcePrefix(tokens: SourceToken[], words: string[]) {
+  const start = tokens.findIndex((token) => token.value.toLowerCase() === words[0]?.toLowerCase())
+  if (start < 0) return prefix(words).join(" ")
+  return prefix(tokens.slice(start).map((token) => token.raw)).join(" ")
+}
+
+function powerShellSourceTokens(resource: string) {
+  const tokens: SourceToken[] = []
+  let raw = ""
+  let value = ""
+  let quote: "single" | "double" | undefined
+  let redirect = false
+
+  const finish = () => {
+    if (!raw) return
+    if (!redirect) tokens.push({ raw, value })
+    raw = ""
+    value = ""
+    redirect = false
+  }
+
+  for (let index = 0; index < resource.length; index++) {
+    const char = resource[index]
+    if (quote === "single") {
+      raw += char
+      if (char === "'" && resource[index + 1] === "'") {
+        raw += resource[++index]
+        value += "'"
+      } else if (char === "'") quote = undefined
+      else value += char
+      continue
+    }
+    if (quote === "double") {
+      raw += char
+      if (char === '"') quote = undefined
+      else if (char === "`" && index + 1 < resource.length) {
+        raw += resource[++index]
+        value += resource[index]
+      } else value += char
+      continue
+    }
+    if (char === "'") {
+      raw += char
+      quote = "single"
+      continue
+    }
+    if (char === '"') {
+      raw += char
+      quote = "double"
+      continue
+    }
+    if (char === "`" && index + 1 < resource.length) {
+      raw += char + resource[++index]
+      if (resource[index] !== "\n" && resource[index] !== "\r") value += resource[index]
+      continue
+    }
+    if (char === "{" && !raw) {
+      const end = powerShellBracedEnd(resource, index)
+      raw = resource.slice(index, end + 1)
+      value = raw
+      index = end
+      continue
+    }
+    if (/\s/.test(char)) {
+      finish()
+      continue
+    }
+    if (char === ">") {
+      if (resource[index + 1] && !/[\s>&]/.test(resource[index + 1])) {
+        raw += char
+        value += char
+        continue
+      }
+      if (/^\d+$/.test(value)) {
+        raw = ""
+        value = ""
+      } else if (raw === "*") {
+        raw = ""
+        value = ""
+      } else finish()
+      redirect = true
+      while (/[>&\d]/.test(resource[index + 1] ?? "")) index++
+      continue
+    }
+    if ((char === "&" || char === ".") && !raw && tokens.length === 0) continue
+    raw += char
+    value += char
+  }
+  finish()
+  return tokens
+}
+
+function powerShellBracedEnd(resource: string, start: number) {
+  let level = 1
+  let quote: "single" | "double" | undefined
+  for (let index = start + 1; index < resource.length; index++) {
+    const char = resource[index]
+    if (char === "`" && quote !== "single") {
+      index++
+      continue
+    }
+    if (quote === "single") {
+      if (char === "'" && resource[index + 1] === "'") index++
+      else if (char === "'") quote = undefined
+      continue
+    }
+    if (quote === "double") {
+      if (char === '"') quote = undefined
+      continue
+    }
+    if (char === "'") {
+      quote = "single"
+      continue
+    }
+    if (char === '"') {
+      quote = "double"
+      continue
+    }
+    if (char === "{") level++
+    if (char === "}" && --level === 0) return index
+  }
+  return resource.length - 1
+}
+
 function parts(node: Node) {
   return Array.from({ length: node.childCount }).flatMap((_, index): Part[] => {
     const child = node.child(index)

packages/core/src/tool/plugin/shell.ts

@@ -163,7 +163,11 @@ export const Plugin = {
                     invocation.cwd = target.absolute
                     finalTimeout = invocation.timeout
                     if (!unrestricted) {
-                      const parsed = yield* ShellParse.scan(invocation.command, invocation.shell, target.absolute)
+                      const portable =
+                        Config.latest(yield* config.entries(), "experimental")?.portable_shell_scanner === true
+                      const parsed = yield* ShellParse.scan(invocation.command, invocation.shell, target.absolute, {
+                        portable,
+                      })
                       const directories = yield* Effect.forEach(parsed.directories, (directory) =>
                         mutation.resolve({ path: path.resolve(target.absolute, directory), kind: "directory" }),
                       )

packages/core/src/tool/plugin/websearch.ts

@@ -4,8 +4,8 @@ import type { Context as PluginContext } from "@opencode-ai/plugin/effect/plugin
 import { ToolFailure } from "@opencode-ai/ai"
 import { Effect, Schema, Semaphore } from "effect"
 import { HttpClientError } from "effect/unstable/http"
+import { Config } from "../../config.js"
 import { Form } from "../../form.js"
-import { KV } from "../../kv.js"
 import { Permission } from "../../permission.js"
 import { WebSearch } from "../../websearch.js"
 
@@ -30,7 +30,7 @@ export const Plugin = {
   effect: Effect.fn("WebSearchTool.Plugin")(function* (ctx: PluginContext) {
     const permission = yield* Permission.Service
     const forms = yield* Form.Service
-    const kv = yield* KV.Service
+    const config = yield* Config.Service
     const websearch = yield* WebSearch.Service
 
     yield* ctx.tool
@@ -65,7 +65,7 @@ export const Plugin = {
                     return providerSelectionLock
                       .withPermit(
                         Effect.gen(function* () {
-                          if (yield* websearch.default()) return yield* Effect.void
+                          if (yield* websearch.default()) return
                           const providers = (yield* ctx.websearch.providers()).data
                           const defaultProvider = providers[0]
                           if (!defaultProvider) return yield* new WebSearch.ProviderRequiredError()
@@ -83,7 +83,7 @@ export const Plugin = {
                                 options: [
                                   {
                                     value: "allow",
-                                    label: `Allow web search via ${defaultProvider.name}`,
+                                    label: `Allow search via ${providers.map((provider) => provider.name).join(", ")}`,
                                   },
                                   {
                                     value: "choose",
@@ -97,7 +97,9 @@ export const Plugin = {
                           if (response.status === "cancelled")
                             return yield* Effect.fail(new Error("Web search cancelled"))
                           if (response.answer.choice === "disable") {
-                            yield* kv.set("websearch:provider", false)
+                            yield* config.update((draft) => {
+                              draft.websearch = false
+                            })
                             return yield* new WebSearch.DisabledError()
                           }
                           const selection =
@@ -123,13 +125,19 @@ export const Plugin = {
                               : undefined
                           if (selection?.status === "cancelled")
                             return yield* Effect.fail(new Error("Web search cancelled"))
-                          const providerID = selection?.answer.provider ?? defaultProvider.id
+                          const providerID = selection?.answer.provider ?? "random"
                           if (
                             typeof providerID !== "string" ||
-                            !providers.some((provider) => provider.id === providerID)
+                            (providerID !== "random" && !providers.some((provider) => provider.id === providerID))
                           )
                             return yield* new WebSearch.ProviderRequiredError()
-                          return yield* kv.set("websearch:provider", providerID)
+                          yield* config.update((draft) => {
+                            draft.websearch = {
+                              provider: providerID === "random" ? "random" : WebSearch.ID.make(providerID),
+                            }
+                          })
+                          if (providerID !== "random") return WebSearch.ID.make(providerID)
+                          return providers[Math.floor(Math.random() * providers.length)]?.id
                         }),
                       )
                       .pipe(
@@ -137,7 +145,12 @@ export const Plugin = {
                           duration: "1 minute",
                           orElse: () => Effect.fail(new Error("Web search cancelled")),
                         }),
-                        Effect.andThen(Effect.suspend(search)),
+                        Effect.flatMap((providerID) => {
+                          if (!providerID) return Effect.suspend(search)
+                          return context
+                            .progress({ provider: providerID })
+                            .pipe(Effect.andThen(ctx.websearch.query({ ...input, providerID })))
+                        }),
                       )
                   }),
                 )
@@ -193,7 +206,8 @@ export const Plugin = {
 
     yield* ctx.session.hook("context", (event) =>
       Effect.gen(function* () {
-        if ((yield* kv.get("websearch:provider")) === false) delete event.tools[name]
+        const disabled = Config.latest(yield* config.entries(), "websearch") === false
+        if (disabled) delete event.tools[name]
       }),
     )
   }),

packages/core/src/websearch.ts

@@ -4,7 +4,6 @@ import { WebSearch } from "@opencode-ai/schema/websearch"
 import { Context, Effect, Layer, Schema } from "effect"
 import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
 import { Bus } from "./bus.js"
-import { KV } from "./kv.js"
 import { State } from "./state.js"
 
 export const ID = WebSearch.ID
@@ -60,14 +59,14 @@ export class Service extends Context.Service<Service, Interface>()("@opencode/We
 
 type Data = {
   readonly providers: Map<ID, ProviderImplementation>
-  defaultProviderID?: ID
+  selection?: ID | "random" | false
 }
 
 export type Draft = {
   add: (provider: ProviderImplementation) => void
   default: {
-    get: () => ID | undefined
-    set: (providerID: ID) => void
+    get: () => ID | "random" | false | undefined
+    set: (selection: ID | "random" | false) => void
   }
 }
 
@@ -75,15 +74,14 @@ const layer = Layer.effect(
   Service,
   Effect.gen(function* () {
     const bus = yield* Bus.Service
-    const kv = yield* KV.Service
     const decodeResults = Schema.decodeUnknownEffect(Schema.Array(Result))
     const state = State.create<Data, Draft>({
       initial: () => ({ providers: new Map() }),
       draft: (draft) => ({
         add: (provider) => draft.providers.set(provider.id, provider),
         default: {
-          get: () => draft.defaultProviderID,
-          set: (providerID) => (draft.defaultProviderID = providerID),
+          get: () => draft.selection,
+          set: (selection) => (draft.selection = selection),
         },
       }),
       finalize: () => bus.publish(WebSearch.Event.Updated, {}).pipe(Effect.asVoid),
@@ -96,12 +94,12 @@ const layer = Layer.effect(
 
     const defaultProvider = Effect.fn("WebSearch.default")(function* () {
       const data = state.get()
-      const configured = data.defaultProviderID ? data.providers.get(data.defaultProviderID) : undefined
-      if (configured) return configured
-      const stored = yield* kv.get("websearch:provider")
-      if (stored === false) return yield* new DisabledError()
-      if (typeof stored !== "string") return
-      return data.providers.get(ID.make(stored))
+      if (data.selection === false) return yield* new DisabledError()
+      if (data.selection === "random") {
+        const providers = Array.from(data.providers.values())
+        return providers[Math.floor(Math.random() * providers.length)]
+      }
+      return data.selection ? data.providers.get(data.selection) : undefined
     })
 
     const resolve = Effect.fn("WebSearch.resolve")(function* (input: Input) {
@@ -140,5 +138,5 @@ const layer = Layer.effect(
 export const node = makeLocationNode({
   service: Service,
   layer,
-  deps: [Bus.node, KV.node],
+  deps: [Bus.node],
 })

packages/core/test/aisdk.test.ts

@@ -468,7 +468,7 @@ it.effect("derives status and code when the AI SDK error message is empty", () =
   }),
 )
 
-it.effect("preserves redacted HTTP context on AI SDK call errors", () =>
+it.effect("preserves complete HTTP context on AI SDK call errors", () =>
   Effect.gen(function* () {
     const error = yield* streamFailure(
       apiCallError({
@@ -480,7 +480,7 @@ it.effect("preserves redacted HTTP context on AI SDK call errors", () =>
     const http = "http" in error.reason ? error.reason.http : undefined
     expect(http?.request.url).toBe("https://api.example.com/chat")
     expect(http?.response?.status).toBe(404)
-    expect(http?.response?.headers["authorization"]).toBe("<redacted>")
+    expect(http?.response?.headers["authorization"]).toBe("Bearer secret-token")
     expect(http?.body).toBe('{"error":{"message":"","code":"not_found"}}')
   }),
 )

packages/core/test/config/config.test.ts

@@ -72,6 +72,53 @@ const provider = {
 }
 
 describe("Config", () => {
+  it.live("updates the first file-backed document", () =>
+    Effect.acquireRelease(
+      Effect.promise(() => tmpdir()),
+      (tmp) => Effect.promise(() => tmp[Symbol.asyncDispose]()),
+    ).pipe(
+      Effect.flatMap((tmp) => {
+        const global = path.join(tmp.path, "global")
+        const project = path.join(tmp.path, "project")
+        const globalFile = path.join(global, "opencode.jsonc")
+        const projectFile = path.join(project, "opencode.json")
+        return Effect.promise(async () => {
+          await Promise.all([fs.mkdir(global, { recursive: true }), fs.mkdir(project, { recursive: true })])
+          await Promise.all([
+            fs.writeFile(globalFile, '{\n  // Keep this comment.\n  "shell": "global"\n}\n'),
+            fs.writeFile(projectFile, JSON.stringify({ shell: "project" })),
+          ])
+        }).pipe(
+          Effect.andThen(
+            Effect.gen(function* () {
+              const config = yield* Config.Service
+              const updated = yield* config.update((draft) => {
+                draft.shell = "updated"
+              })
+
+              expect(updated.shell).toBe("updated")
+              expect(yield* Effect.promise(() => fs.readFile(globalFile, "utf8"))).toContain("// Keep this comment.")
+              expect(yield* Effect.promise(() => fs.readFile(globalFile, "utf8"))).toContain('"shell": "updated"')
+              expect(JSON.parse(yield* Effect.promise(() => fs.readFile(projectFile, "utf8")))).toEqual({
+                shell: "project",
+              })
+            }).pipe(Effect.provide(testLayer(project, global))),
+          ),
+        )
+      }),
+    ),
+  )
+
+  it.effect("fails updates when no file-backed document exists", () =>
+    Effect.gen(function* () {
+      const config = yield* Config.Service
+      const error = yield* config.update((draft) => void draft).pipe(Effect.flip)
+      expect(error.message).toBe("No editable config document found")
+    }).pipe(
+      Effect.provide(Config.testLayer([new Document({ type: "document", info: new Info({ shell: "virtual" }) })])),
+    ),
+  )
+
   it.live("loads explicit file and content overrides in priority order", () =>
     Effect.acquireRelease(
       Effect.promise(() => tmpdir()),
@@ -858,7 +905,7 @@ describe("Config", () => {
             expect(documents.map((document) => document.type)).toEqual(["document", "document"])
             expect(documents.map((document) => document.info.$schema)).toEqual(["base", "last"])
             expect(documents[0]).toBeInstanceOf(Document)
-            expect(documents[0]?.path).toBe(path.join(tmp.path, "opencode.json"))
+            expect(documents[0]?.path).toBe(AbsolutePath.make(path.join(tmp.path, "opencode.json")))
             expect(documents[1]?.info.providers?.last).toBeInstanceOf(ConfigProvider.Info)
 
             yield* Effect.promise(() =>
@@ -1405,9 +1452,14 @@ describe("Config", () => {
           )
           return yield* Effect.gen(function* () {
             const config = yield* Config.Service
+            const watcher = yield* Watcher.Test
             const documents = (yield* config.entries()).filter((entry) => entry.type === "document")
 
             expect(documents.map((document) => document.info.$schema)).toEqual(["base"])
+            expect(yield* watcher.subscriptions()).toContainEqual({
+              path: path.join(tmp.path, "opencode.jsonc"),
+              type: "file",
+            })
           }).pipe(Effect.provide(testLayer(tmp.path)))
         }),
       ),
@@ -1491,13 +1543,9 @@ describe("Config", () => {
               "global",
               AbsolutePath.make(global),
               "outside",
-              AbsolutePath.make(path.join(tmp.path, "opencode.json")),
               "root",
-              AbsolutePath.make(path.join(root, "opencode.json")),
               "parent",
-              AbsolutePath.make(path.join(parent, "opencode.jsonc")),
               "directory",
-              AbsolutePath.make(path.join(directory, "opencode.json")),
               "root-dot",
               AbsolutePath.make(path.join(root, ".opencode")),
               "directory-dot",

packages/core/test/config/normalization.test.ts

@@ -393,11 +393,13 @@ describe("ConfigNormalize", () => {
         enabled_providers: ["anthropic"],
         disabled_providers: ["openai"],
         experimental: {
+          portable_shell_scanner: true,
           subagent_depth: 0,
           policies: [{ action: "provider.use", resource: "custom", effect: "allow" }],
         },
       }).encoded.experimental,
     ).toEqual({
+      portable_shell_scanner: true,
       subagent_depth: 0,
       policies: [
         { action: "provider.use", resource: "*", effect: "deny" },

packages/core/test/config/reload.test.ts

@@ -18,6 +18,7 @@ import { Provider } from "@opencode-ai/core/provider"
 import { Reference } from "@opencode-ai/core/reference"
 import { Skill } from "@opencode-ai/core/skill"
 import { Effect, Schema } from "effect"
+import { AbsolutePath } from "@opencode-ai/core/schema"
 import { testEffect } from "../lib/effect"
 import { PluginTestLayer } from "../plugin/fixture"
 
@@ -79,7 +80,7 @@ describe("config plugin reloads", () => {
 function config(name: string) {
   return new Document({
     type: "document",
-    path: document,
+    path: AbsolutePath.make(document),
     info: decode({
       agents: { [name]: { description: `${title(name)} agent`, mode: "subagent" } },
       commands: { [name]: { template: `${title(name)} command`, description: `${title(name)} command` } },

packages/core/test/fixture/durable-object-storage.ts

@@ -3,8 +3,7 @@ import type { DurableObjectStorage } from "@opencode-ai/core/database/sqlite.wor
 
 // Emulates the Durable Object storage API over bun:sqlite so the workerd
 // adapter and the workerd server profile can be verified without workerd or
-// Cloudflare runtime dependencies. The real runtime is covered by the
-// workerd-spike package, which boots inside an actual isolate.
+// Cloudflare runtime dependencies.
 export const makeDurableObjectStorage = (): DurableObjectStorage => {
   const native = new Database(":memory:")
   const toSqlStorageValue = (value: unknown) => {

packages/core/test/formatter.test.ts

@@ -1,7 +1,7 @@
 import fs from "fs/promises"
 import path from "path"
 import { describe, expect } from "bun:test"
-import { Effect, Layer, Schema, Stream } from "effect"
+import { Effect, Layer, Schema } from "effect"
 import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { Npm } from "@opencode-ai/util/npm"
@@ -27,16 +27,7 @@ function formatterLayer(directory: string, configured?: ConfigInput["formatter"]
           }),
         ]
   return AppNodeBuilder.build(Formatter.node, [
-    [
-      Config.node,
-      Layer.succeed(
-        Config.Service,
-        Config.Service.of({
-          entries: () => Effect.succeed(entries),
-          changes: () => Stream.empty,
-        }),
-      ),
-    ],
+    [Config.node, Config.testLayer(entries)],
     [
       Location.node,
       Layer.succeed(Location.Service, Location.Service.of(location({ directory: AbsolutePath.make(directory) }))),

packages/core/test/lib/websocket-server.ts

@@ -0,0 +1,71 @@
+import { Buffer } from "node:buffer"
+import { Effect } from "effect"
+
+interface ConnectionData {
+  readonly id: number
+}
+
+export interface WebSocketServerState {
+  readonly headers: Array<Record<string, string>>
+  readonly messages: string[]
+  opens: number
+  closes: number
+  pongs: number
+}
+
+export interface WebSocketServerFixture {
+  readonly url: string
+  readonly state: WebSocketServerState
+}
+
+export interface WebSocketServerOptions {
+  readonly upgrade?: (request: Request) => boolean
+  readonly open?: (socket: Bun.ServerWebSocket<ConnectionData>) => void
+  readonly message?: (socket: Bun.ServerWebSocket<ConnectionData>, message: string | Buffer) => void
+}
+
+export const makeWebSocketServer = (options: WebSocketServerOptions = {}) =>
+  Effect.acquireRelease(
+    Effect.sync(() => {
+      const state: WebSocketServerState = { headers: [], messages: [], opens: 0, closes: 0, pongs: 0 }
+      let connection = 0
+      const server = Bun.serve<ConnectionData>({
+        hostname: "127.0.0.1",
+        port: 0,
+        fetch(request, server) {
+          state.headers.push(Object.fromEntries(request.headers.entries()))
+          if ((options.upgrade?.(request) ?? true) && server.upgrade(request, { data: { id: connection++ } }))
+            return undefined
+          return new Response("WebSocket upgrade required", {
+            status: 426,
+            headers: { "x-upgrade-rejected": "true" },
+          })
+        },
+        websocket: {
+          open(socket) {
+            state.opens++
+            options.open?.(socket)
+          },
+          message(socket, message) {
+            const text = typeof message === "string" ? message : message.toString()
+            state.messages.push(text)
+            options.message?.(socket, message)
+          },
+          close() {
+            state.closes++
+          },
+          pong() {
+            state.pongs++
+          },
+        },
+      })
+      return {
+        server,
+        fixture: {
+          url: `${server.url.toString().replace(/^http/, "ws")}responses`,
+          state,
+        } satisfies WebSocketServerFixture,
+      }
+    }),
+    ({ server }) => Effect.promise(() => server.stop(true)),
+  ).pipe(Effect.map((item) => item.fixture))

packages/core/test/mcp.test.ts

@@ -185,7 +185,11 @@ function resourceMcpLayer(
         overrides?.entries
           ? Layer.succeed(
               Config.Service,
-              Config.Service.of({ entries: overrides.entries, changes: () => Stream.never }),
+              Config.Service.of({
+                entries: overrides.entries,
+                update: () => Effect.die("unused config update"),
+                changes: () => Stream.never,
+              }),
             )
           : Config.testLayer([
               new Document({

packages/core/test/plugin/host.ts

@@ -388,7 +388,10 @@ export function webSearchHost(websearch: WebSearch.Interface): Plugin.Context["w
             }),
           default: {
             get: draft.default.get,
-            set: (providerID) => draft.default.set(WebSearch.ID.make(providerID)),
+            set: (selection) =>
+              draft.default.set(
+                selection === false || selection === "random" ? selection : WebSearch.ID.make(selection),
+              ),
           },
         })
       }),

packages/core/test/plugin/promise.test.ts

@@ -4,6 +4,7 @@ import { DateTime, Effect, Schema } from "effect"
 import { Agent } from "@opencode-ai/core/agent"
 import { Catalog } from "@opencode-ai/core/catalog"
 import { Model } from "@opencode-ai/core/model"
+import { Location } from "@opencode-ai/core/location"
 import { Plugin } from "@opencode-ai/core/plugin"
 import { PluginHooks } from "@opencode-ai/core/plugin/hooks"
 import { PluginHost } from "@opencode-ai/core/plugin/host"
@@ -14,7 +15,10 @@ import { SessionMessage } from "@opencode-ai/core/session/message"
 import { SessionInbox } from "@opencode-ai/core/session/inbox"
 import { Tool } from "@opencode-ai/core/tool"
 import { Provider } from "@opencode-ai/core/provider"
+import { Project } from "@opencode-ai/core/project"
+import { AbsolutePath } from "@opencode-ai/core/schema"
 import { define } from "@opencode-ai/plugin/promise/plugin"
+import { Money } from "@opencode-ai/schema/money"
 import type { SessionHooks } from "@opencode-ai/plugin/effect/session"
 import { testEffect } from "../lib/effect"
 import { PluginTestLayer } from "./fixture"
@@ -23,6 +27,53 @@ import { host as testHost } from "./host"
 const it = testEffect(PluginTestLayer)
 
 describe("fromPromise", () => {
+  it.effect("adapts session creation through the protocol schema", () =>
+    Effect.gen(function* () {
+      let seen: unknown
+      const host = testHost({
+        session: {
+          create: (input) => {
+            seen = input
+            return Effect.succeed(
+              Session.Info.make({
+                id: Session.ID.make("ses_protocol_adapter"),
+                projectID: Project.ID.make("project"),
+                cost: Money.USD.make(0),
+                tokens: { input: 1, output: 2, reasoning: 3, cache: { read: 4, write: 5 } },
+                time: { created: DateTime.makeUnsafe(10), updated: DateTime.makeUnsafe(20) },
+                title: input?.title,
+                location: Location.Ref.make({ directory: AbsolutePath.make("/workspace") }),
+              }),
+            )
+          },
+        },
+      })
+
+      yield* PluginPromise.fromPromise(
+        define({
+          id: "promise-session-create",
+          setup: async (ctx) => {
+            await expect(Reflect.apply(ctx.session.create, undefined, [{ title: 42 }])).rejects.toBeDefined()
+            const result = await ctx.session.create({
+              id: null,
+              title: "Promise title",
+              agent: null,
+              model: null,
+              location: null,
+            })
+            expect(result).toMatchObject({
+              id: "ses_protocol_adapter",
+              title: "Promise title",
+              time: { created: 10, updated: 20 },
+            })
+          },
+        }),
+      ).effect(host)
+
+      expect(seen).toEqual({ title: "Promise title" })
+    }),
+  )
+
   it.effect("forwards transient session generation", () =>
     Effect.gen(function* () {
       const host = testHost({
@@ -44,6 +95,42 @@ describe("fromPromise", () => {
     }),
   )
 
+  it.effect("preserves no-content and rejected Promise behavior", () =>
+    Effect.gen(function* () {
+      const seen: unknown[] = []
+      const host = testHost({
+        session: {
+          interrupt: (input) => {
+            if (input.sessionID === Session.ID.make("ses_failure")) {
+              return Effect.fail(new Error("interrupt failed"))
+            }
+            expect(input.continue).toBe(true)
+            return Effect.void
+          },
+          rename: (input) => Effect.sync(() => seen.push(input)),
+          wait: (input) => Effect.sync(() => seen.push(input)),
+        },
+      })
+
+      yield* PluginPromise.fromPromise(
+        define({
+          id: "promise-session-interrupt",
+          setup: async (ctx) => {
+            expect(await ctx.session.interrupt({ sessionID: "ses_success", continue: true })).toBeUndefined()
+            await expect(ctx.session.interrupt({ sessionID: "ses_failure" })).rejects.toThrow("interrupt failed")
+            expect(await ctx.session.rename({ sessionID: "ses_success", title: "Renamed" })).toBeUndefined()
+            expect(await ctx.session.wait({ sessionID: "ses_success" })).toBeUndefined()
+          },
+        }),
+      ).effect(host)
+
+      expect(seen).toEqual([
+        { sessionID: Session.ID.make("ses_success"), title: "Renamed" },
+        { sessionID: Session.ID.make("ses_success") },
+      ])
+    }),
+  )
+
   it.effect("forwards synthetic session input", () =>
     Effect.gen(function* () {
       const input = {
@@ -114,6 +201,7 @@ describe("fromPromise", () => {
             ctx.skill.list(),
           ])
           seen.push(...results.map((result) => result.location.directory))
+          expect((await ctx.integration.get({ integrationID: "missing" })).data).toBeNull()
         },
       })
 

packages/core/test/plugin/provider-openai.test.ts

@@ -1,6 +1,4 @@
 import { Money } from "@opencode-ai/schema/money"
-import { Agent } from "@opencode-ai/schema/agent"
-import { Session } from "@opencode-ai/schema/session"
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
 import { Catalog } from "@opencode-ai/core/catalog"
@@ -29,14 +27,9 @@ function required<T>(value: T | undefined): T {
   return value
 }
 
-const http = Effect.fn(function* (providerID: Provider.ID, url: string) {
-  const event = yield* (yield* PluginHooks.Service).trigger("session", "http.request", {
-    sessionID: Session.ID.make("ses_test"),
-    agent: Agent.ID.make("build"),
-    model: Model.Ref.make({ providerID, id: Model.ID.make("gpt-5.5") }),
-    request: new Request(url, { method: "POST", body: "{}" }),
-  })
-  return { url: event.request.url, headers: Object.fromEntries(event.request.headers.entries()) }
+const httpMiddlewareCount = Effect.fn(function* () {
+  const hooks = yield* PluginHooks.Service
+  return Number(yield* hooks.has("session", "http.request")) + Number(yield* hooks.has("session", "http.response"))
 })
 
 describe("OpenAIPlugin", () => {
@@ -110,19 +103,11 @@ describe("OpenAIPlugin", () => {
       })
       yield* addPlugin()
 
-      const request = yield* http(Provider.ID.openai, "https://api.openai.com/v1/responses")
-      const custom = yield* http(Provider.ID.make("custom-openai"), "https://custom.example/v1/responses")
-      const proxy = yield* http(Provider.ID.openai, "https://proxy.example/v1/responses?region=us")
-
       const provider = required(yield* catalog.provider.get(Provider.ID.openai))
       expect(provider.package).toBe("@opencode-ai/ai/providers/openai")
       expect(provider.settings).toMatchObject({ baseURL: "https://chatgpt.com/backend-api/codex" })
-      expect(provider.headers).toMatchObject({ "chatgpt-account-id": "acct_123" })
-      expect(request.url).toBe("https://chatgpt.com/backend-api/codex/responses")
-      expect(request.headers).toMatchObject({ originator: "opencode", "session-id": "ses_test" })
-      expect(custom.headers).not.toHaveProperty("originator")
-      expect(proxy.url).toBe("https://proxy.example/v1/responses?region=us")
-      expect(proxy.headers).toMatchObject({ originator: "opencode", "session-id": "ses_test" })
+      expect(provider.headers).toMatchObject({ originator: "opencode", "chatgpt-account-id": "acct_123" })
+      expect(yield* httpMiddlewareCount()).toBe(0)
       const eligible = required(yield* catalog.model.get(Provider.ID.openai, Model.ID.make("gpt-5.5")))
       expect(eligible.package).toBe("@opencode-ai/ai/providers/openai")
       expect(eligible.cost).toEqual([])
@@ -166,13 +151,13 @@ describe("OpenAIPlugin", () => {
       })
       yield* addPlugin()
 
-      const request = yield* http(Provider.ID.openai, "https://api.openai.com/v1/responses")
-
+      const provider = required(yield* catalog.provider.get(Provider.ID.openai))
       const model = required(yield* catalog.model.get(Provider.ID.openai, Model.ID.make("gpt-5.5")))
       expect(model.package).toBe("@opencode-ai/ai/providers/openai")
       expect(model.enabled).toBe(true)
       expect(model.limit).toEqual({ context: 1_050_000, input: 922_000, output: 128_000 })
-      expect(request.headers).not.toHaveProperty("originator")
+      expect(provider.headers).not.toHaveProperty("originator")
+      expect(yield* httpMiddlewareCount()).toBe(0)
       expect(required(yield* catalog.model.get(Provider.ID.openai, Model.ID.make("gpt-4.1"))).enabled).toBe(true)
     }),
   )

packages/core/test/plugin/system-prompt.test.ts

@@ -7,6 +7,7 @@ import { PluginHooks } from "@opencode-ai/core/plugin/hooks"
 import { PluginHost } from "@opencode-ai/core/plugin/host"
 import { SystemPromptPlugin } from "@opencode-ai/core/plugin/system-prompt"
 import { Session } from "@opencode-ai/core/session"
+import { SessionSystemPrompt } from "@opencode-ai/core/session/system-prompt"
 import type { SessionHooks } from "@opencode-ai/plugin/effect/session"
 import { Model } from "@opencode-ai/schema/model"
 import { Provider } from "@opencode-ai/schema/provider"
@@ -14,10 +15,9 @@ import { Effect } from "effect"
 import { testEffect } from "../lib/effect"
 import { PluginTestLayer } from "./fixture"
 import PROMPT_META from "../../src/plugin/system-prompt/meta.txt"
-import PROMPT_DEFAULT from "../../src/session/runner/prompt/base.txt"
 
 const it = testEffect(PluginTestLayer)
-const fallback = PROMPT_DEFAULT
+const fallback = SessionSystemPrompt.make([])
 const makeHost = Effect.gen(function* () {
   const agents = yield* Agent.Service
   const plugins = yield* Plugin.Service
@@ -74,7 +74,7 @@ describe("SystemPromptPlugin", () => {
         ["kimi-k2", "# Prompt and Tool Use"],
         ["trinity", "what command should I run to list files"],
         ["meta/muse-spark-1.1", "powered by Muse Spark"],
-        ["llama-3.3", "You are opencode, an interactive CLI tool"],
+        ["llama-3.3", fallback],
       ] as const
 
       yield* Effect.forEach(