app-server.md Codex Docs, 2026-03-17 00:33 UTC → 2026-04-25 00:42 UTC

12Supported transports:12Supported transports:

13 13 

14- `stdio` (`--listen stdio://`, default): newline-delimited JSON (JSONL).14- `stdio` (`--listen stdio://`, default): newline-delimited JSON (JSONL).

15- `websocket` (`--listen ws://IP:PORT`, experimental): one JSON-RPC message per WebSocket text frame.15- `websocket` (`--listen ws://IP:PORT`, experimental and unsupported): one JSON-RPC message per WebSocket text frame.

16- `off` (`--listen off`): don't expose a local transport.

17 

18When you run with `--listen ws://IP:PORT`, the same listener also serves basic HTTP health probes:

19 

20- `GET /readyz` returns `200 OK` once the listener accepts new connections.

21- `GET /healthz` returns `200 OK` when the request doesn't include an `Origin` header.

22- Requests with an `Origin` header are rejected with `403 Forbidden`.

23 

24WebSocket transport is experimental and unsupported. Loopback listeners such as `ws://127.0.0.1:PORT` are appropriate for localhost and SSH port-forwarding workflows. Non-loopback WebSocket listeners currently allow unauthenticated connections by default during rollout, so configure WebSocket auth before exposing one remotely.

25 

26Supported WebSocket auth flags:

27 

28- `--ws-auth capability-token --ws-token-file /absolute/path`

29- `--ws-auth capability-token --ws-token-sha256 HEX`

30- `--ws-auth signed-bearer-token --ws-shared-secret-file /absolute/path`

31 

32For signed bearer tokens, you can also set `--ws-issuer`, `--ws-audience`, and `--ws-max-clock-skew-seconds`. Clients present the credential as `Authorization: Bearer <token>` during the WebSocket handshake, and app-server enforces auth before JSON-RPC `initialize`.

33 

34Prefer `--ws-token-file` over passing raw bearer tokens on the command line. Use `--ws-token-sha256` only when the client keeps the raw high-entropy token in a separate local secret store; the hash is only a verifier, and clients still need the original token.

16 35 

17In WebSocket mode, app-server uses bounded queues. When request ingress is full, the server rejects new requests with JSON-RPC error code `-32001` and message `"Server overloaded; retry later."` Clients should retry with an exponentially increasing delay and jitter.36In WebSocket mode, app-server uses bounded queues. When request ingress is full, the server rejects new requests with JSON-RPC error code `-32001` and message `"Server overloaded; retry later."` Clients should retry with an exponentially increasing delay and jitter.

18 37 

21Requests include `method`, `params`, and `id`:40Requests include `method`, `params`, and `id`:

22 41 

23```json42```json

24{ "method": "thread/start", "id": 10, "params": { "model": "gpt-5.1-codex" } }43{ "method": "thread/start", "id": 10, "params": { "model": "gpt-5.4" } }

25```44```

26 45 

27Responses echo the `id` with either `result` or `error`:46Responses echo the `id` with either `result` or `error`:

99 },118 },

100});119});

101send({ method: "initialized", params: {} });120send({ method: "initialized", params: {} });

102send({ method: "thread/start", id: 1, params: { model: "gpt-5.1-codex" } });121send({ method: "thread/start", id: 1, params: { model: "gpt-5.4" } });

103```122```

104 123 

105## Core primitives124## Core primitives

123 142 

124Clients must send a single `initialize` request per transport connection before invoking any other method on that connection, then acknowledge with an `initialized` notification. Requests sent before initialization receive a `Not initialized` error, and repeated `initialize` calls on the same connection return `Already initialized`.143Clients must send a single `initialize` request per transport connection before invoking any other method on that connection, then acknowledge with an `initialized` notification. Requests sent before initialization receive a `Not initialized` error, and repeated `initialize` calls on the same connection return `Already initialized`.

125 144 

126The server returns the user agent string it will present to upstream services. Set `clientInfo` to identify your integration.145The server returns the user agent string it will present to upstream services plus `platformFamily` and `platformOs` values that describe the runtime target. Set `clientInfo` to identify your integration.

127 146 

128`initialize.params.capabilities` also supports per-connection notification opt-out via `optOutNotificationMethods`, which is a list of exact method names to suppress for that connection. Matching is exact (no wildcards/prefixes). Unknown method names are accepted and ignored.147`initialize.params.capabilities` also supports per-connection notification opt-out via `optOutNotificationMethods`, which is a list of exact method names to suppress for that connection. Matching is exact (no wildcards/prefixes). Unknown method names are accepted and ignored.

129 148 

159 },178 },

160 "capabilities": {179 "capabilities": {

161 "experimentalApi": true,180 "experimentalApi": true,

162 "optOutNotificationMethods": [181 "optOutNotificationMethods": ["thread/started", "item/agentMessage/delta"]

163 "codex/event/session_configured",

164 "item/agentMessage/delta"

165 ]

166 }182 }

167 }183 }

168}184}

202- `thread/resume` - reopen an existing thread by id so later `turn/start` calls append to it.218- `thread/resume` - reopen an existing thread by id so later `turn/start` calls append to it.

203- `thread/fork` - fork a thread into a new thread id by copying stored history; emits `thread/started` for the new thread.219- `thread/fork` - fork a thread into a new thread id by copying stored history; emits `thread/started` for the new thread.

204- `thread/read` - read a stored thread by id without resuming it; set `includeTurns` to return full turn history. Returned `thread` objects include runtime `status`.220- `thread/read` - read a stored thread by id without resuming it; set `includeTurns` to return full turn history. Returned `thread` objects include runtime `status`.

205- `thread/list` - page through stored thread logs; supports cursor-based pagination plus `modelProviders`, `sourceKinds`, `archived`, and `cwd` filters. Returned `thread` objects include runtime `status`.221- `thread/list` - page through stored thread logs; supports cursor-based pagination plus `modelProviders`, `sourceKinds`, `archived`, `cwd`, and `searchTerm` filters. Returned `thread` objects include runtime `status`.

222- `thread/turns/list` - page through a stored thread's turn history without resuming it.

206- `thread/loaded/list` - list the thread ids currently loaded in memory.223- `thread/loaded/list` - list the thread ids currently loaded in memory.

224- `thread/name/set` - set or update a thread's user-facing name for a loaded thread or a persisted rollout; emits `thread/name/updated`.

225- `thread/metadata/update` - patch SQLite-backed stored thread metadata; currently supports persisted `gitInfo`.

207- `thread/archive` - move a thread's log file into the archived directory; returns `{}` on success and emits `thread/archived`.226- `thread/archive` - move a thread's log file into the archived directory; returns `{}` on success and emits `thread/archived`.

208- `thread/unsubscribe` - unsubscribe this connection from thread turn/item events. If this was the last subscriber, the server unloads the thread and emits `thread/closed`.227- `thread/unsubscribe` - unsubscribe this connection from thread turn/item events. If this was the last subscriber, the server unloads the thread after a no-subscriber inactivity grace period and emits `thread/closed`.

209- `thread/unarchive` - restore an archived thread rollout back into the active sessions directory; returns the restored `thread` and emits `thread/unarchived`.228- `thread/unarchive` - restore an archived thread rollout back into the active sessions directory; returns the restored `thread` and emits `thread/unarchived`.

210- `thread/status/changed` - notification emitted when a loaded thread's runtime `status` changes.229- `thread/status/changed` - notification emitted when a loaded thread's runtime `status` changes.

211- `thread/compact/start` - trigger conversation history compaction for a thread; returns `{}` immediately while progress streams via `turn/*` and `item/*` notifications.230- `thread/compact/start` - trigger conversation history compaction for a thread; returns `{}` immediately while progress streams via `turn/*` and `item/*` notifications.

231- `thread/shellCommand` - run a user-initiated shell command against a thread. This runs outside the sandbox with full access and doesn't inherit the thread sandbox policy.

232- `thread/backgroundTerminals/clean` - stop all running background terminals for a thread (experimental; requires `capabilities.experimentalApi`).

212- `thread/rollback` - drop the last N turns from the in-memory context and persist a rollback marker; returns the updated `thread`.233- `thread/rollback` - drop the last N turns from the in-memory context and persist a rollback marker; returns the updated `thread`.

213- `turn/start` - add user input to a thread and begin Codex generation; responds with the initial `turn` and streams events. For `collaborationMode`, `settings.developer_instructions: null` means "use built-in instructions for the selected mode."234- `turn/start` - add user input to a thread and begin Codex generation; responds with the initial `turn` and streams events. For `collaborationMode`, `settings.developer_instructions: null` means "use built-in instructions for the selected mode."

235- `thread/inject_items` - append raw Responses API items to a loaded thread's model-visible history without starting a user turn.

214- `turn/steer` - append user input to the active in-flight turn for a thread; returns the accepted `turnId`.236- `turn/steer` - append user input to the active in-flight turn for a thread; returns the accepted `turnId`.

215- `turn/interrupt` - request cancellation of an in-flight turn; success is `{}` and the turn ends with `status: "interrupted"`.237- `turn/interrupt` - request cancellation of an in-flight turn; success is `{}` and the turn ends with `status: "interrupted"`.

216- `review/start` - kick off the Codex reviewer for a thread; emits `enteredReviewMode` and `exitedReviewMode` items.238- `review/start` - kick off the Codex reviewer for a thread; emits `enteredReviewMode` and `exitedReviewMode` items.

217- `command/exec` - run a single command under the server sandbox without starting a thread/turn.239- `command/exec` - run a single command under the server sandbox without starting a thread/turn.

240- `command/exec/write` - write `stdin` bytes to a running `command/exec` session or close `stdin`.

241- `command/exec/resize` - resize a running PTY-backed `command/exec` session.

242- `command/exec/terminate` - stop a running `command/exec` session.

243- `command/exec/outputDelta` (notify) - emitted for base64-encoded stdout/stderr chunks from a streaming `command/exec` session.

218- `model/list` - list available models (set `includeHidden: true` to include entries with `hidden: true`) with effort options, optional `upgrade`, and `inputModalities`.244- `model/list` - list available models (set `includeHidden: true` to include entries with `hidden: true`) with effort options, optional `upgrade`, and `inputModalities`.

219- `experimentalFeature/list` - list feature flags with lifecycle stage metadata and cursor pagination.245- `experimentalFeature/list` - list feature flags with lifecycle stage metadata and cursor pagination.

246- `experimentalFeature/enablement/set` - patch in-memory runtime enablement for supported feature keys such as `apps` and `plugins`.

220- `collaborationMode/list` - list collaboration mode presets (experimental, no pagination).247- `collaborationMode/list` - list collaboration mode presets (experimental, no pagination).

221- `skills/list` - list skills for one or more `cwd` values (supports `forceReload` and optional `perCwdExtraUserRoots`).248- `skills/list` - list skills for one or more `cwd` values (supports `forceReload` and optional `perCwdExtraUserRoots`).

249- `skills/changed` (notify) - emitted when watched local skill files change.

250- `marketplace/add` - add a remote plugin marketplace and persist it into the user's marketplace config.

251- `plugin/list` - list discovered plugin marketplaces and plugin state, including install/auth policy metadata, marketplace load errors, featured plugin ids, and local, Git, or remote plugin source metadata.

252- `plugin/read` - read one plugin by marketplace path or remote marketplace name and plugin name, including bundled skills, apps, and MCP server names when those details are available.

253- `plugin/install` - install a plugin from a marketplace path or remote marketplace name.

254- `plugin/uninstall` - uninstall an installed plugin.

222- `app/list` - list available apps (connectors) with pagination plus accessibility/enabled metadata.255- `app/list` - list available apps (connectors) with pagination plus accessibility/enabled metadata.

223- `skills/config/write` - enable or disable skills by path.256- `skills/config/write` - enable or disable skills by path.

224- `mcpServer/oauth/login` - start an OAuth login for a configured MCP server; returns an authorization URL and emits `mcpServer/oauthLogin/completed` on completion.257- `mcpServer/oauth/login` - start an OAuth login for a configured MCP server; returns an authorization URL and emits `mcpServer/oauthLogin/completed` on completion.

225- `tool/requestUserInput` - prompt the user with 1-3 short questions for a tool call (experimental); questions can set `isOther` for a free-form option.258- `tool/requestUserInput` - prompt the user with 1-3 short questions for a tool call (experimental); questions can set `isOther` for a free-form option.

226- `config/mcpServer/reload` - reload MCP server configuration from disk and queue a refresh for loaded threads.259- `config/mcpServer/reload` - reload MCP server configuration from disk and queue a refresh for loaded threads.

227- `mcpServerStatus/list` - list MCP servers, tools, resources, and auth status (cursor + limit pagination).260- `mcpServerStatus/list` - list MCP servers, tools, resources, and auth status (cursor + limit pagination). Use `detail: "full"` for full data or `detail: "toolsAndAuthOnly"` to omit resources.

261- `mcpServer/resource/read` - read a single MCP resource through an initialized MCP server.

262- `mcpServer/tool/call` - call a tool on a thread's configured MCP server.

263- `mcpServer/startupStatus/updated` (notify) - emitted when a configured MCP server's startup status changes for a loaded thread.

228- `windowsSandbox/setupStart` - start Windows sandbox setup for `elevated` or `unelevated` mode; returns quickly and later emits `windowsSandbox/setupCompleted`.264- `windowsSandbox/setupStart` - start Windows sandbox setup for `elevated` or `unelevated` mode; returns quickly and later emits `windowsSandbox/setupCompleted`.

229- `feedback/upload` - submit a feedback report (classification + optional reason/logs + conversation id, plus optional `extraLogFiles` attachments).265- `feedback/upload` - submit a feedback report (classification + optional reason/logs + conversation id, plus optional `extraLogFiles` attachments).

230- `config/read` - fetch the effective configuration on disk after resolving configuration layering.266- `config/read` - fetch the effective configuration on disk after resolving configuration layering.

231- `externalAgentConfig/detect` - detect migratable external-agent artifacts with `includeHome` and optional `cwds`; each detected item includes `cwd` (`null` for home).267- `externalAgentConfig/detect` - detect external-agent artifacts that can be migrated with `includeHome` and optional `cwds`; each detected item includes `cwd` (`null` for home).

232- `externalAgentConfig/import` - apply selected external-agent migration items by passing explicit `migrationItems` with `cwd` (`null` for home).268- `externalAgentConfig/import` - apply selected external-agent migration items by passing explicit `migrationItems` with `cwd` (`null` for home); plugin imports emit `externalAgentConfig/import/completed`.

233- `config/value/write` - write a single configuration key/value to the user's `config.toml` on disk.269- `config/value/write` - write a single configuration key/value to the user's `config.toml` on disk.

234- `config/batchWrite` - apply configuration edits atomically to the user's `config.toml` on disk.270- `config/batchWrite` - apply configuration edits atomically to the user's `config.toml` on disk.

235- `configRequirements/read` - fetch requirements from `requirements.toml` and/or MDM, including allow-lists, pinned `featureRequirements`, and residency/network requirements (or `null` if you haven't set any up).271- `configRequirements/read` - fetch requirements from `requirements.toml` and/or MDM, including allow-lists, pinned `featureRequirements`, and residency/network requirements (or `null` if you haven't set any up).

272- `fs/readFile`, `fs/writeFile`, `fs/createDirectory`, `fs/getMetadata`, `fs/readDirectory`, `fs/remove`, `fs/copy`, `fs/watch`, `fs/unwatch`, and `fs/changed` (notify) - operate on absolute filesystem paths through the app-server v2 filesystem API.

273 

274Plugin summaries include a `source` union. Local plugins return

275`{ "type": "local", "path": ... }`, Git-backed marketplace entries return

276`{ "type": "git", "url": ..., "path": ..., "refName": ..., "sha": ... }`,

277and remote catalog entries return `{ "type": "remote" }`. For remote-only

278catalog entries, `PluginMarketplaceEntry.path` can be `null`; pass

279`remoteMarketplaceName` instead of `marketplacePath` when reading or installing

280those plugins.

236 281 

237## Models282## Models

238 283 

301## Threads346## Threads

302 347 

303- `thread/read` reads a stored thread without subscribing to it; set `includeTurns` to include turns.348- `thread/read` reads a stored thread without subscribing to it; set `includeTurns` to include turns.

304- `thread/list` supports cursor pagination plus `modelProviders`, `sourceKinds`, `archived`, and `cwd` filtering.349- `thread/turns/list` pages through a stored thread's turn history without resuming it.

350- `thread/list` supports cursor pagination plus `modelProviders`, `sourceKinds`, `archived`, `cwd`, and `searchTerm` filtering.

305- `thread/loaded/list` returns the thread IDs currently in memory.351- `thread/loaded/list` returns the thread IDs currently in memory.

306- `thread/archive` moves the thread's persisted JSONL log into the archived directory.352- `thread/archive` moves the thread's persisted JSONL log into the archived directory.

307- `thread/unsubscribe` unsubscribes the current connection from a loaded thread and can trigger `thread/closed`.353- `thread/metadata/update` patches stored thread metadata, currently including persisted `gitInfo`.

354- `thread/unsubscribe` unsubscribes the current connection from a loaded thread and can trigger `thread/closed` after an inactivity grace period.

308- `thread/unarchive` restores an archived thread rollout back into the active sessions directory.355- `thread/unarchive` restores an archived thread rollout back into the active sessions directory.

309- `thread/compact/start` triggers compaction and returns `{}` immediately.356- `thread/compact/start` triggers compaction and returns `{}` immediately.

310- `thread/rollback` drops the last N turns from the in-memory context and records a rollback marker in the thread's persisted JSONL log.357- `thread/rollback` drops the last N turns from the in-memory context and records a rollback marker in the thread's persisted JSONL log.

358- `thread/inject_items` appends raw Responses API items to a loaded thread's model-visible history without starting a user turn.

311 359 

312### Start or resume a thread360### Start or resume a thread

313 361 

315 363 

316```json364```json

317{ "method": "thread/start", "id": 10, "params": {365{ "method": "thread/start", "id": 10, "params": {

318 "model": "gpt-5.1-codex",366 "model": "gpt-5.4",

319 "cwd": "/Users/me/project",367 "cwd": "/Users/me/project",

320 "approvalPolicy": "never",368 "approvalPolicy": "never",

321 "sandbox": "workspaceWrite",369 "sandbox": "workspaceWrite",

378 426 

379Unlike `thread/resume`, `thread/read` doesn't load the thread into memory or emit `thread/started`.427Unlike `thread/resume`, `thread/read` doesn't load the thread into memory or emit `thread/started`.

380 428 

429### List thread turns

430 

431Use `thread/turns/list` to page a stored thread's turn history without resuming it. Results default to newest-first so clients can fetch older turns with `nextCursor`. The response also includes `backwardsCursor`; pass it as `cursor` with `sortDirection: "asc"` to fetch turns newer than the first item from the earlier page.

432 

433```json

434{ "method": "thread/turns/list", "id": 20, "params": {

435 "threadId": "thr_123",

436 "limit": 50,

437 "sortDirection": "desc"

438} }

439{ "id": 20, "result": {

440 "data": [],

441 "nextCursor": "older-turns-cursor-or-null",

442 "backwardsCursor": "newer-turns-cursor-or-null"

443} }

444```

445 

381### List threads (with pagination & filters)446### List threads (with pagination & filters)

382 447 

383`thread/list` lets you render a history UI. Results default to newest-first by `createdAt`. Filters apply before pagination. Pass any combination of:448`thread/list` lets you render a history UI. Results default to newest-first by `createdAt`. Filters apply before pagination. Pass any combination of:

389- `sourceKinds` - restrict results to specific thread sources. When omitted or `[]`, the server defaults to interactive sources only: `cli` and `vscode`.454- `sourceKinds` - restrict results to specific thread sources. When omitted or `[]`, the server defaults to interactive sources only: `cli` and `vscode`.

390- `archived` - when `true`, list archived threads only. When `false` or omitted, list non-archived threads (default).455- `archived` - when `true`, list archived threads only. When `false` or omitted, list non-archived threads (default).

391- `cwd` - restrict results to threads whose session current working directory exactly matches this path.456- `cwd` - restrict results to threads whose session current working directory exactly matches this path.

457- `searchTerm` - search stored thread summaries and metadata before pagination.

392 458 

393`sourceKinds` accepts the following values:459`sourceKinds` accepts the following values:

394 460 

422 488 

423When `nextCursor` is `null`, you have reached the final page.489When `nextCursor` is `null`, you have reached the final page.

424 490 

491### Update stored thread metadata

492 

493Use `thread/metadata/update` to patch stored thread metadata without resuming the thread. Today this supports persisted `gitInfo`; omitted fields are left unchanged, and explicit `null` clears a stored value.

494 

495```json

496{ "method": "thread/metadata/update", "id": 21, "params": {

497 "threadId": "thr_123",

498 "gitInfo": { "branch": "feature/sidebar-pr" }

499} }

500{ "id": 21, "result": {

501 "thread": {

502 "id": "thr_123",

503 "gitInfo": { "sha": null, "branch": "feature/sidebar-pr", "originUrl": null }

504 }

505} }

506```

507 

425### Track thread status changes508### Track thread status changes

426 509 

427`thread/status/changed` is emitted whenever a loaded thread's runtime status changes. The payload includes `threadId` and the new `status`.510`thread/status/changed` is emitted whenever a loaded thread's runtime status changes. The payload includes `threadId` and the new `status`.

450`thread/unsubscribe` removes the current connection's subscription to a thread. The response status is one of:533`thread/unsubscribe` removes the current connection's subscription to a thread. The response status is one of:

451 534 

452- `unsubscribed` when the connection was subscribed and is now removed.535- `unsubscribed` when the connection was subscribed and is now removed.

453- `notSubscribed` when the connection was not subscribed to that thread.536- `notSubscribed` when the connection wasn't subscribed to that thread.

454- `notLoaded` when the thread is not loaded.537- `notLoaded` when the thread isn't loaded.

455 538 

456If this was the last subscriber, the server unloads the thread and emits a `thread/status/changed` transition to `notLoaded` plus `thread/closed`.539If this was the last subscriber, the server keeps the thread loaded until it has no subscribers and no thread activity for 30 minutes. When the grace period expires, app-server unloads the thread and emits a `thread/status/changed` transition to `notLoaded` plus `thread/closed`.

457 540 

458```json541```json

459{ "method": "thread/unsubscribe", "id": 22, "params": { "threadId": "thr_123" } }542{ "method": "thread/unsubscribe", "id": 22, "params": { "threadId": "thr_123" } }

460{ "id": 22, "result": { "status": "unsubscribed" } }543{ "id": 22, "result": { "status": "unsubscribed" } }

544```

545 

546If the thread later expires:

547 

548```json

461{ "method": "thread/status/changed", "params": {549{ "method": "thread/status/changed", "params": {

462 "threadId": "thr_123",550 "threadId": "thr_123",

463 "status": { "type": "notLoaded" }551 "status": { "type": "notLoaded" }

498{ "id": 25, "result": {} }586{ "id": 25, "result": {} }

499```587```

500 588 

589### Run a thread shell command

590 

591Use `thread/shellCommand` for user-initiated shell commands that belong to a thread. The request returns immediately with `{}` while progress streams through standard `turn/*` and `item/*` notifications.

592 

593This API runs outside the sandbox with full access and doesn't inherit the thread sandbox policy. Clients should expose it only for explicit user-initiated commands.

594 

595If the thread already has an active turn, the command runs as an auxiliary action on that turn and its formatted output is injected into the turn's message stream. If the thread is idle, app-server starts a standalone turn for the shell command.

596 

597```json

598{ "method": "thread/shellCommand", "id": 26, "params": { "threadId": "thr_b", "command": "git status --short" } }

599{ "id": 26, "result": {} }

600```

601 

602### Clean background terminals

603 

604Use `thread/backgroundTerminals/clean` to stop all running background terminals associated with a thread. This method is experimental and requires `capabilities.experimentalApi = true`.

605 

606```json

607{ "method": "thread/backgroundTerminals/clean", "id": 27, "params": { "threadId": "thr_b" } }

608{ "id": 27, "result": {} }

609```

610 

501### Roll back recent turns611### Roll back recent turns

502 612 

503Use `thread/rollback` to remove the last `numTurns` entries from the in-memory context and persist a rollback marker in the rollout log. The returned `thread` includes `turns` populated after the rollback.613Use `thread/rollback` to remove the last `numTurns` entries from the in-memory context and persist a rollback marker in the rollout log. The returned `thread` includes `turns` populated after the rollback.

504 614 

505```json615```json

506{ "method": "thread/rollback", "id": 26, "params": { "threadId": "thr_b", "numTurns": 1 } }616{ "method": "thread/rollback", "id": 28, "params": { "threadId": "thr_b", "numTurns": 1 } }

507{ "id": 26, "result": { "thread": { "id": "thr_b", "name": "Bug bash notes", "ephemeral": false } } }617{ "id": 28, "result": { "thread": { "id": "thr_b", "name": "Bug bash notes", "ephemeral": false } } }

508```618```

509 619 

510## Turns620## Turns

570 "writableRoots": ["/Users/me/project"],680 "writableRoots": ["/Users/me/project"],

571 "networkAccess": true681 "networkAccess": true

572 },682 },

573 "model": "gpt-5.1-codex",683 "model": "gpt-5.4",

574 "effort": "medium",684 "effort": "medium",

575 "summary": "concise",685 "summary": "concise",

576 "personality": "friendly",686 "personality": "friendly",

584{ "id": 30, "result": { "turn": { "id": "turn_456", "status": "inProgress", "items": [], "error": null } } }694{ "id": 30, "result": { "turn": { "id": "turn_456", "status": "inProgress", "items": [], "error": null } } }

585```695```

586 696 

697### Inject items into a thread

698 

699Use `thread/inject_items` to append prebuilt Responses API items to a loaded thread's prompt history without starting a user turn. These items are persisted to the rollout and included in subsequent model requests.

700 

701```json

702{ "method": "thread/inject_items", "id": 31, "params": {

703 "threadId": "thr_123",

704 "items": [

705 {

706 "type": "message",

707 "role": "assistant",

708 "content": [{ "type": "output_text", "text": "Previously computed context." }]

709 }

710 ]

711} }

712{ "id": 31, "result": {} }

713```

714 

587### Steer an active turn715### Steer an active turn

588 716 

589Use `turn/steer` to append more user input to the active in-flight turn.717Use `turn/steer` to append more user input to the active in-flight turn.

713- The server rejects empty `command` arrays.841- The server rejects empty `command` arrays.

714- `sandboxPolicy` accepts the same shape used by `turn/start` (for example, `dangerFullAccess`, `readOnly`, `workspaceWrite`, `externalSandbox`).842- `sandboxPolicy` accepts the same shape used by `turn/start` (for example, `dangerFullAccess`, `readOnly`, `workspaceWrite`, `externalSandbox`).

715- When omitted, `timeoutMs` falls back to the server default.843- When omitted, `timeoutMs` falls back to the server default.

844- Set `tty: true` for PTY-backed sessions, and use `processId` when you plan to follow up with `command/exec/write`, `command/exec/resize`, or `command/exec/terminate`.

845- Set `streamStdoutStderr: true` to receive `command/exec/outputDelta` notifications while the command is running.

716 846 

717### Read admin requirements (`configRequirements/read`)847### Read admin requirements (`configRequirements/read`)

718 848 

763- `elevated` - run the elevated Windows sandbox setup path.893- `elevated` - run the elevated Windows sandbox setup path.

764- `unelevated` - run the legacy setup/preflight path.894- `unelevated` - run the legacy setup/preflight path.

765 895 

896## Filesystem

897 

898The v2 filesystem APIs operate on absolute paths. Use `fs/watch` when a client needs to invalidate UI state after a file or directory changes.

899 

900```json

901{ "method": "fs/watch", "id": 54, "params": {

902 "watchId": "0195ec6b-1d6f-7c2e-8c7a-56f2c4a8b9d1",

903 "path": "/Users/me/project/.git/HEAD"

904} }

905{ "id": 54, "result": { "path": "/Users/me/project/.git/HEAD" } }

906{ "method": "fs/changed", "params": {

907 "watchId": "0195ec6b-1d6f-7c2e-8c7a-56f2c4a8b9d1",

908 "changedPaths": ["/Users/me/project/.git/HEAD"]

909} }

910{ "method": "fs/unwatch", "id": 55, "params": {

911 "watchId": "0195ec6b-1d6f-7c2e-8c7a-56f2c4a8b9d1"

912} }

913{ "id": 55, "result": {} }

914```

915 

916Watching a file emits `fs/changed` for that file path, including updates delivered by replace or rename operations.

917 

766## Events918## Events

767 919 

768Event notifications are the server-initiated stream for thread lifecycles, turn lifecycles, and the items within them. After you start or resume a thread, keep reading the active transport stream for `thread/started`, `thread/archived`, `thread/unarchived`, `thread/closed`, `thread/status/changed`, `turn/*`, `item/*`, and `serverRequest/resolved` notifications.920Event notifications are the server-initiated stream for thread lifecycles, turn lifecycles, and the items within them. After you start or resume a thread, keep reading the active transport stream for `thread/started`, `thread/archived`, `thread/unarchived`, `thread/closed`, `thread/status/changed`, `turn/*`, `item/*`, and `serverRequest/resolved` notifications.

773 925 

774- Exact-match only: `item/agentMessage/delta` suppresses only that method.926- Exact-match only: `item/agentMessage/delta` suppresses only that method.

775- Unknown method names are ignored.927- Unknown method names are ignored.

776- Applies to both legacy (`codex/event/*`) and v2 (`thread/*`, `turn/*`, `item/*`, etc.) notifications.928- Applies to the current `thread/*`, `turn/*`, `item/*`, and related v2 notifications.

777- Doesn't apply to requests, responses, or errors.929- Doesn't apply to requests, responses, or errors.

778 930 

779### Fuzzy file search events (experimental)931### Fuzzy file search events (experimental)

983} }1135} }

984```1136```

985 1137 

1138The server also emits `skills/changed` notifications when watched local skill files change. Treat this as an invalidation signal and rerun `skills/list` with your current params when needed.

1139 

986To enable or disable a skill by path:1140To enable or disable a skill by path:

987 1141 

988```json1142```json

1149 1303 

1150### Detect and import external agent config1304### Detect and import external agent config

1151 1305 

1152Use `externalAgentConfig/detect` to discover migratable external-agent artifacts, then pass the selected entries to `externalAgentConfig/import`.1306Use `externalAgentConfig/detect` to discover external-agent artifacts that can be migrated, then pass the selected entries to `externalAgentConfig/import`.

1153 1307 

1154Detection example:1308Detection example:

1155 1309 

1189{ "id": 64, "result": {} }1343{ "id": 64, "result": {} }

1190```1344```

1191 1345 

1192Supported `itemType` values are `AGENTS_MD`, `CONFIG`, `SKILLS`, and `MCP_SERVER_CONFIG`. Detection returns only items that still have work to do. For example, AGENTS migration is skipped when `AGENTS.md` already exists and is non-empty, and skill imports do not overwrite existing skill directories.1346When a request includes plugin imports, the server emits `externalAgentConfig/import/completed` after the import finishes. This notification may arrive immediately after the response or after background remote imports complete.

1347 

1348Supported `itemType` values are `AGENTS_MD`, `CONFIG`, `SKILLS`, `PLUGINS`,

1349and `MCP_SERVER_CONFIG`. For `PLUGINS` items, `details.plugins` lists each

1350`marketplaceName` and the `pluginNames` Codex can try to migrate. Detection

1351returns only items that still have work to do. For example, Codex skips AGENTS

1352migration when `AGENTS.md` already exists and is non-empty, and skill imports

1353don't overwrite existing skill directories.

1354 

1355When detecting plugins from `.claude/settings.json`, Codex reads configured

1356marketplace sources from `extraKnownMarketplaces`. If `enabledPlugins` contains

1357plugins from `claude-plugins-official` but the marketplace source is missing,

1358Codex infers `anthropics/claude-plugins-official` as the source.

1193 1359 

1194## Auth endpoints1360## Auth endpoints

1195 1361 

1196The JSON-RPC auth/account surface exposes request/response methods plus server-initiated notifications (no `id`). Use these to determine auth state, start or cancel logins, logout, and inspect ChatGPT rate limits.1362The JSON-RPC auth/account surface exposes request/response methods plus server-initiated notifications (no `id`). Use these to determine auth state, start or cancel logins, logout, inspect ChatGPT rate limits, and notify workspace owners about depleted credits or usage limits.

1197 1363 

1198### Authentication modes1364### Authentication modes

1199 1365 

1200Codex supports three authentication modes. `account/updated.authMode` shows the active mode, and `account/read` also reports it.1366Codex supports these authentication modes. `account/updated.authMode` shows the active mode and includes the current ChatGPT `planType` when available. `account/read` also reports account and plan details.

1201 1367 

1202- **API key (`apikey`)** - the caller supplies an OpenAI API key and Codex stores it for API requests.1368- **API key (`apikey`)** - the caller supplies an OpenAI API key with `type: "apiKey"`, and Codex stores it for API requests.

1203- **ChatGPT managed (`chatgpt`)** - Codex owns the ChatGPT OAuth flow, persists tokens, and refreshes them automatically.1369- **ChatGPT managed (`chatgpt`)** - Codex owns the ChatGPT OAuth flow, persists tokens, and refreshes them automatically. Start with `type: "chatgpt"` for the browser flow or `type: "chatgptDeviceCode"` for the device-code flow.

1204- **ChatGPT external tokens (`chatgptAuthTokens`)** - a host app supplies `idToken` and `accessToken` directly. Codex stores these tokens in memory, and the host app must refresh them when asked.1370- **ChatGPT external tokens (`chatgptAuthTokens`)** - experimental and intended for host apps that already own the user's ChatGPT auth lifecycle. The host app supplies an `accessToken`, `chatgptAccountId`, and optional `chatgptPlanType` directly, and must refresh the token when asked.

1205 1371 

1206### API overview1372### API overview

1207 1373 

1208- `account/read` - fetch current account info; optionally refresh tokens.1374- `account/read` - fetch current account info; optionally refresh tokens.

1209- `account/login/start` - begin login (`apiKey`, `chatgpt`, or `chatgptAuthTokens`).1375- `account/login/start` - begin login (`apiKey`, `chatgpt`, `chatgptDeviceCode`, or experimental `chatgptAuthTokens`).

1210- `account/login/completed` (notify) - emitted when a login attempt finishes (success or error).1376- `account/login/completed` (notify) - emitted when a login attempt finishes (success or error).

1211- `account/login/cancel` - cancel a pending ChatGPT login by `loginId`.1377- `account/login/cancel` - cancel a pending managed ChatGPT login by `loginId`.

1212- `account/logout` - sign out; triggers `account/updated`.1378- `account/logout` - sign out; triggers `account/updated`.

1213- `account/updated` (notify) - emitted whenever auth mode changes (`authMode`: `apikey`, `chatgpt`, `chatgptAuthTokens`, or `null`).1379- `account/updated` (notify) - emitted whenever auth mode changes (`authMode`: `apikey`, `chatgpt`, `chatgptAuthTokens`, or `null`) and includes `planType` when available.

1214- `account/chatgptAuthTokens/refresh` (server request) - request fresh externally managed ChatGPT tokens after an authorization error.1380- `account/chatgptAuthTokens/refresh` (server request) - request fresh externally managed ChatGPT tokens after an authorization error.

1215- `account/rateLimits/read` - fetch ChatGPT rate limits.1381- `account/rateLimits/read` - fetch ChatGPT rate limits.

1216- `account/rateLimits/updated` (notify) - emitted whenever a user's ChatGPT rate limits change.1382- `account/rateLimits/updated` (notify) - emitted whenever a user's ChatGPT rate limits change.

1383- `account/sendAddCreditsNudgeEmail` - ask ChatGPT to email a workspace owner about depleted credits or a reached usage limit.

1217- `mcpServer/oauthLogin/completed` (notify) - emitted after a `mcpServer/oauth/login` flow finishes; payload includes `{ name, success, error? }`.1384- `mcpServer/oauthLogin/completed` (notify) - emitted after a `mcpServer/oauth/login` flow finishes; payload includes `{ name, success, error? }`.

1385- `mcpServer/startupStatus/updated` (notify) - emitted when a configured MCP server's startup status changes for a loaded thread; payload includes `{ name, status, error }`.

1218 1386 

1219### 1) Check auth state1387### 1) Check auth state

1220 1388 

1286 ```1454 ```

1287 1455 

1288 ```json1456 ```json

1289 { "method": "account/updated", "params": { "authMode": "apikey" } }1457 {

1458 "method": "account/updated",

1459 "params": { "authMode": "apikey", "planType": null }

1460 }

1290 ```1461 ```

1291 1462 

1292### 3) Log in with ChatGPT (browser flow)1463### 3) Log in with ChatGPT (browser flow)

1318 ```1489 ```

1319 1490 

1320 ```json1491 ```json

1321 { "method": "account/updated", "params": { "authMode": "chatgpt" } }1492 {

1493 "method": "account/updated",

1494 "params": { "authMode": "chatgpt", "planType": "plus" }

1495 }

1496 ```

1497 

1498### 3b) Log in with ChatGPT (device-code flow)

1499 

1500Use this flow when your client owns the sign-in ceremony or when a browser callback is brittle.

1501 

15021. Start:

1503 

1504 ```json

1505 {

1506 "method": "account/login/start",

1507 "id": 4,

1508 "params": { "type": "chatgptDeviceCode" }

1509 }

1510 ```

1511 

1512 ```json

1513 {

1514 "id": 4,

1515 "result": {

1516 "type": "chatgptDeviceCode",

1517 "loginId": "<uuid>",

1518 "verificationUrl": "https://auth.openai.com/codex/device",

1519 "userCode": "ABCD-1234"

1520 }

1521 }

1522 ```

15232. Show `verificationUrl` and `userCode` to the user; the frontend owns the UX.

15243. Wait for notifications:

1525 

1526 ```json

1527 {

1528 "method": "account/login/completed",

1529 "params": { "loginId": "<uuid>", "success": true, "error": null }

1530 }

1531 ```

1532 

1533 ```json

1534 {

1535 "method": "account/updated",

1536 "params": { "authMode": "chatgpt", "planType": "plus" }

1537 }

1322 ```1538 ```

1323 1539 

1324### 3b) Log in with externally managed ChatGPT tokens (`chatgptAuthTokens`)1540### 3c) Log in with externally managed ChatGPT tokens (`chatgptAuthTokens`)

1325 1541 

1326Use this mode when a host application owns the user’s ChatGPT auth lifecycle and supplies tokens directly.1542Use this experimental mode only when a host application owns the user's ChatGPT auth lifecycle and supplies tokens directly. Clients must set `capabilities.experimentalApi = true` during `initialize` before using this login type.

1327 1543 

13281. Send:15441. Send:

1329 1545 

1333 "id": 7,1549 "id": 7,

1334 "params": {1550 "params": {

1335 "type": "chatgptAuthTokens",1551 "type": "chatgptAuthTokens",

1336 "idToken": "<jwt>",1552 "accessToken": "<jwt>",

1337 "accessToken": "<jwt>"1553 "chatgptAccountId": "org-123",

1554 "chatgptPlanType": "business"

1338 }1555 }

1339 }1556 }

1340 ```1557 ```

1355 ```json1572 ```json

1356 {1573 {

1357 "method": "account/updated",1574 "method": "account/updated",

1358 "params": { "authMode": "chatgptAuthTokens" }1575 "params": { "authMode": "chatgptAuthTokens", "planType": "business" }

1359 }1576 }

1360 ```1577 ```

1361 1578 

1367 "id": 8,1584 "id": 8,

1368 "params": { "reason": "unauthorized", "previousAccountId": "org-123" }1585 "params": { "reason": "unauthorized", "previousAccountId": "org-123" }

1369}1586}

1370{ "id": 8, "result": { "idToken": "<jwt>", "accessToken": "<jwt>" } }1587{ "id": 8, "result": { "accessToken": "<jwt>", "chatgptAccountId": "org-123", "chatgptPlanType": "business" } }

1371```1588```

1372 1589 

1373The server retries the original request after a successful refresh response. Requests time out after about 10 seconds.1590The server retries the original request after a successful refresh response. Requests time out after about 10 seconds.

1384```json1601```json

1385{ "method": "account/logout", "id": 5 }1602{ "method": "account/logout", "id": 5 }

1386{ "id": 5, "result": {} }1603{ "id": 5, "result": {} }

1387{ "method": "account/updated", "params": { "authMode": null } }1604{ "method": "account/updated", "params": { "authMode": null, "planType": null } }

1388```1605```

1389 1606 

1390### 6) Rate limits (ChatGPT)1607### 6) Rate limits (ChatGPT)

1396 "limitId": "codex",1613 "limitId": "codex",

1397 "limitName": null,1614 "limitName": null,

1398 "primary": { "usedPercent": 25, "windowDurationMins": 15, "resetsAt": 1730947200 },1615 "primary": { "usedPercent": 25, "windowDurationMins": 15, "resetsAt": 1730947200 },

1399 "secondary": null1616 "secondary": null,

1617 "rateLimitReachedType": null

1400 },1618 },

1401 "rateLimitsByLimitId": {1619 "rateLimitsByLimitId": {

1402 "codex": {1620 "codex": {

1403 "limitId": "codex",1621 "limitId": "codex",

1404 "limitName": null,1622 "limitName": null,

1405 "primary": { "usedPercent": 25, "windowDurationMins": 15, "resetsAt": 1730947200 },1623 "primary": { "usedPercent": 25, "windowDurationMins": 15, "resetsAt": 1730947200 },

1406 "secondary": null1624 "secondary": null,

1625 "rateLimitReachedType": null

1407 },1626 },

1408 "codex_other": {1627 "codex_other": {

1409 "limitId": "codex_other",1628 "limitId": "codex_other",

1410 "limitName": "codex_other",1629 "limitName": "codex_other",

1411 "primary": { "usedPercent": 42, "windowDurationMins": 60, "resetsAt": 1730950800 },1630 "primary": { "usedPercent": 42, "windowDurationMins": 60, "resetsAt": 1730950800 },

1412 "secondary": null1631 "secondary": null,

1632 "rateLimitReachedType": null

1413 }1633 }

1414 }1634 }

1415} }1635} }

1430- `usedPercent` is current usage within the quota window.1650- `usedPercent` is current usage within the quota window.

1431- `windowDurationMins` is the quota window length.1651- `windowDurationMins` is the quota window length.

1432- `resetsAt` is a Unix timestamp (seconds) for the next reset.1652- `resetsAt` is a Unix timestamp (seconds) for the next reset.

1653- `planType` is included when the backend returns the ChatGPT plan associated with a bucket.

1654- `credits` is included when the backend returns remaining workspace credit details.

1655- `rateLimitReachedType` identifies the backend-classified limit state when one has been reached.

1656 

1657### 7) Notify a workspace owner about a limit

1658 

1659Use `account/sendAddCreditsNudgeEmail` to ask ChatGPT to email a workspace owner when credits are depleted or a usage limit has been reached.

1660 

1661```json

1662{ "method": "account/sendAddCreditsNudgeEmail", "id": 7, "params": { "creditType": "credits" } }

1663{ "id": 7, "result": { "status": "sent" } }

1664```

1665 

1666Use `creditType: "credits"` when workspace credits are depleted, or `creditType: "usage_limit"` when the workspace usage limit has been reached. If the owner was already notified recently, the response status is `cooldown_active`.