hooks diff — Spybara

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9- Run a custom validation check when a conversation turn stops, enforcing standards9- Run a custom validation check when a conversation turn stops, enforcing standards

10- Customize prompting when in a certain directory10- Customize prompting when in a certain directory

11 11

~~12Hooks are behind a feature flag in `config.toml`:~~12Hooks are enabled by default. If you need to turn them off in `config.toml`,

13set:

13 14

14```toml15```toml

15[features]16[features]

~~16codex_hooks = true~~17hooks = false

17```18```

18 19

20Use `hooks` as the canonical feature key. `codex_hooks` still works as a

21deprecated alias.

23Admins can force hooks off the same way in `requirements.toml` with

24`[features].hooks = false`.

19Runtime behavior to keep in mind:26Runtime behavior to keep in mind:

20 27

21- Matching hooks from multiple files all run.28- Matching hooks from multiple files all run.

22- Multiple matching command hooks for the same event are launched concurrently,29- Multiple matching command hooks for the same event are launched concurrently,

23 so one hook cannot prevent another matching hook from starting.30 so one hook cannot prevent another matching hook from starting.

31- Non-managed command hooks must be reviewed and trusted before they run.

24- `PreToolUse`, `PermissionRequest`, `PostToolUse`, `UserPromptSubmit`, and32- `PreToolUse`, `PermissionRequest`, `PostToolUse`, `UserPromptSubmit`, and

25 `Stop` run at turn scope.33 `Stop` run at turn scope.

26 34

31- `hooks.json`39- `hooks.json`

32- inline `[hooks]` tables inside `config.toml`40- inline `[hooks]` tables inside `config.toml`

33 41

42Installed plugins can also bundle lifecycle config through their plugin

43manifest or a default `hooks/hooks.json` file. See [Build

44plugins](https://developers.openai.com/codex/plugins/build#bundled-mcp-servers-and-lifecycle-config) for the

45plugin packaging rules.

34In practice, the four most useful locations are:47In practice, the four most useful locations are:

35 48

36- `~/.codex/hooks.json`49- `~/.codex/hooks.json`

39- `<repo>/.codex/config.toml`52- `<repo>/.codex/config.toml`

40 53

41If more than one hook source exists, Codex loads all matching hooks.54If more than one hook source exists, Codex loads all matching hooks.

~~42Higher-precedence config layers do not replace lower-precedence hooks.~~55Higher-precedence config layers don't replace lower-precedence hooks.

43If a single layer contains both `hooks.json` and inline `[hooks]`, Codex56If a single layer contains both `hooks.json` and inline `[hooks]`, Codex

44merges them and warns at startup. Prefer one representation per layer.57merges them and warns at startup. Prefer one representation per layer.

45 58

59Plugin hooks are off by default in this release. If

60`[features].plugin_hooks = true`, Codex can also discover hooks bundled with

61enabled plugins. Otherwise, enabled plugins won't run bundled hooks.

46Project-local hooks load only when the project `.codex/` layer is trusted. In63Project-local hooks load only when the project `.codex/` layer is trusted. In

47untrusted projects, Codex still loads user and system hooks from their own64untrusted projects, Codex still loads user and system hooks from their own

48active config layers.65active config layers.

49 66

67## Review and manage hooks

69Codex lists configured hooks before deciding which ones can run. Use `/hooks`

70in the CLI to inspect hook sources, review new or changed hooks, trust hooks, or

71disable individual non-managed hooks. If hooks need review at startup, Codex

72prints a warning that tells you to open `/hooks`.

74Managed hooks from system, MDM, cloud, or `requirements.toml` sources are marked

75as managed, trusted by policy, and can't be disabled from the user hook browser.

50## Config shape77## Config shape

51 78

52Hooks are organized in three levels:79Hooks are organized in three levels:

136- `timeout` is in seconds.163- `timeout` is in seconds.

137- If `timeout` is omitted, Codex uses `600` seconds.164- If `timeout` is omitted, Codex uses `600` seconds.

138- `statusMessage` is optional.165- `statusMessage` is optional.

166- `async` is parsed, but async command hooks aren't supported yet. Codex skips

167 handlers with `async: true`.

168- Only `type: "command"` handlers run today. `prompt` and `agent` handlers are

169 parsed but skipped.

139- Commands run with the session `cwd` as their working directory.170- Commands run with the session `cwd` as their working directory.

140- For repo-local hooks, prefer resolving from the git root instead of using a171- For repo-local hooks, prefer resolving from the git root instead of using a

141 relative path such as `.codex/hooks/...`. Codex may be started from a172 relative path such as `.codex/hooks/...`. Codex may be started from a

144Equivalent inline TOML in `config.toml`:175Equivalent inline TOML in `config.toml`:

145 176

146```toml177```toml

147[features]

148codex_hooks = true

~~149~~

150[[hooks.PreToolUse]]178[[hooks.PreToolUse]]

151matcher = "^Bash$"179matcher = "^Bash$"

152 180

171Enterprise-managed requirements can also define hooks inline under `[hooks]`.199Enterprise-managed requirements can also define hooks inline under `[hooks]`.

172This is useful when admins want to enforce the hook configuration while200This is useful when admins want to enforce the hook configuration while

173delivering the actual scripts through MDM or another device-management system.201delivering the actual scripts through MDM or another device-management system.

202To enforce managed hooks even for users who disabled hooks locally, pin

203`[features].hooks = true` in `requirements.toml` alongside `[hooks]`.

174 204

175```toml205```toml

176[features]206[features]

177codex_hooks = true207hooks = true

178 208

179[hooks]209[hooks]

180managed_dir = "/enterprise/hooks"210managed_dir = "/enterprise/hooks"

194 224

195- `managed_dir` is used on macOS and Linux.225- `managed_dir` is used on macOS and Linux.

196- `windows_managed_dir` is used on Windows.226- `windows_managed_dir` is used on Windows.

197- Codex does not distribute the scripts in `managed_dir`; your enterprise227- Codex doesn't distribute the scripts in `managed_dir`; your enterprise

198 tooling must install and update them separately.228 tooling must install and update them separately.

199- Managed hook commands should use absolute script paths under the configured229- Managed hook commands should use absolute script paths under the configured

200 managed directory.230 managed directory.

201 231

232## Plugin-bundled hooks

233

234Plugin-bundled hooks are opt-in for this release. When

235`[features].plugin_hooks = true` and a plugin is enabled, Codex can load

236lifecycle hooks from that plugin alongside user, project, and managed hooks.

237

238```toml

239[features]

240plugin_hooks = true

241```

242

243By default, Codex looks for `hooks/hooks.json` inside the plugin root. A plugin

244manifest can override that default with a `hooks` entry in

245`.codex-plugin/plugin.json`. The manifest entry can be a `./`-prefixed path, an

246array of `./`-prefixed paths, an inline hooks object, or an array of inline

247hooks objects.

248

249```json

250{

251 "name": "repo-policy",

252 "hooks": "./hooks/hooks.json"

253}

254```

255

256Manifest hook paths are resolved relative to the plugin root and must stay

257inside that root. If a manifest defines `hooks`, Codex uses those manifest

258entries instead of the default `hooks/hooks.json`.

259

260Plugin hook commands receive these environment variables:

261

262- `PLUGIN_ROOT` is a Codex-specific extension that points to the installed

263 plugin root.

264- `PLUGIN_DATA` is a Codex-specific extension that points to the plugin's

265 writable data directory.

266- Codex also sets `CLAUDE_PLUGIN_ROOT` and `CLAUDE_PLUGIN_DATA` for

267 compatibility with existing plugin hooks.

268

269Plugin hooks use the same event schema as other hooks. They are non-managed

270hooks, so they require trust review before they run.

271

202## Matcher patterns272## Matcher patterns

203 273

204The `matcher` field is a regex string that filters when hooks fire. Use `"*"`,274The `matcher` field is a regex string that filters when hooks fire. Use `"*"`,

208Only some current Codex events honor `matcher`:278Only some current Codex events honor `matcher`:

209 279

211| --- | --- | --- |281| ------------------- | ---------------------- | ------------------------------------------------------------ |

218 288

219\*For `apply_patch`, matchers can also use `Edit` or `Write`.289\*For `apply_patch`, `matcher` values can also use `Edit` or `Write`.

220 290

221Examples:291Examples:

222 292

234These are the shared fields you will usually use:304These are the shared fields you will usually use:

235 305

237| --- | --- | --- |307| ----------------- | ---------------- | ------------------------------------------- |

240| `cwd` | `string` | Working directory for the session |310| `cwd` | `string` | Working directory for the session |

313

314Turn-scoped hooks list `turn_id` as a Codex-specific extension in their

315event-specific tables.

316

317`SessionStart`, `PreToolUse`, `PermissionRequest`, `PostToolUse`,

318`UserPromptSubmit`, and `Stop` also include `permission_mode`, which describes

319the current permission mode as `default`, `acceptEdits`, `plan`, `dontAsk`, or

320`bypassPermissions`.

243 321

244Turn-scoped hooks list `turn_id` in their event-specific tables.322`transcript_path` points to a conversation transcript for convenience, but the

323transcript format is not a stable interface for hooks and may change over time.

245 324

246If you need the full wire format, see [Schemas](#schemas).325If you need the full wire format, see [Schemas](#schemas).

247 326

283Fields in addition to [Common input fields](#common-input-fields):362Fields in addition to [Common input fields](#common-input-fields):

284 363

286| --- | --- | --- |365| -------- | -------- | -------------------------------------------------------- |

288 367

289Plain text on `stdout` is added as extra developer context.368Plain text on `stdout` is added as extra developer context.

290 369

305### PreToolUse384### PreToolUse

306 385

307`PreToolUse` can intercept Bash, file edits performed through `apply_patch`,386`PreToolUse` can intercept Bash, file edits performed through `apply_patch`,

308and MCP tool calls. It is still a guardrail rather than a complete enforcement387and MCP tool calls. It's still a guardrail rather than a complete enforcement

309boundary because Codex can often perform equivalent work through another388boundary because Codex can often perform equivalent work through another

310supported tool path.389supported tool path.

311 390

315 `WebSearch` or other non-shell, non-MCP tool calls.394 `WebSearch` or other non-shell, non-MCP tool calls.

316 395

317`matcher` is applied to `tool_name` and matcher aliases. For file edits through396`matcher` is applied to `tool_name` and matcher aliases. For file edits through

318`apply_patch`, matchers can use `apply_patch`, `Edit`, or `Write`; hook input397`apply_patch`, `matcher` values can use `apply_patch`, `Edit`, or `Write`; hook input

319still reports `tool_name: "apply_patch"`.398still reports `tool_name: "apply_patch"`.

320 399

321Fields in addition to [Common input fields](#common-input-fields):400Fields in addition to [Common input fields](#common-input-fields):

322 401

324| --- | --- | --- |403| ------------- | ------------ | ---------------------------------------------------------------------------------------------------------- |

329 408

330Plain text on `stdout` is ignored.409Plain text on `stdout` is ignored.

331 410

332JSON on `stdout` can use `systemMessage` and can block a Bash command with this411JSON on `stdout` can use `systemMessage`. To deny a supported tool call, return

333hook-specific shape:412this hook-specific shape:

334 413

335```json414```json

336{415{

353 432

354You can also use exit code `2` and write the blocking reason to `stderr`.433You can also use exit code `2` and write the blocking reason to `stderr`.

355 434

356`permissionDecision: "allow"` and `"ask"`, legacy `decision: "approve"`,435To add model-visible context without blocking, return

357`updatedInput`, `additionalContext`, `continue: false`, `stopReason`, and436`hookSpecificOutput.additionalContext`:

358`suppressOutput` are parsed but not supported yet, so they fail open.437

438```json

439{

440 "hookSpecificOutput": {

441 "hookEventName": "PreToolUse",

442 "additionalContext": "The pending command touches generated files."

443 }

444}

445```

446

447`permissionDecision: "ask"`, legacy `decision: "approve"`, `updatedInput`,

448`continue: false`, `stopReason`, and `suppressOutput` are parsed but not

449supported yet, so they fail open.

359 450

360### PermissionRequest451### PermissionRequest

361 452

371Fields in addition to [Common input fields](#common-input-fields):462Fields in addition to [Common input fields](#common-input-fields):

372 463

374| --- | --- | --- |465| ------------------------ | ---------------- | --------------------------------------------------------------------------------------------------------- |

379 470

380Plain text on `stdout` is ignored.471Plain text on `stdout` is ignored.

381 472

473Some tool inputs may include a human-readable description, but don't rely on a

474`tool_input.description` field for every tool.

475

382To approve the request, return:476To approve the request, return:

383 477

384```json478```json

427 `WebSearch` or other non-shell, non-MCP tool calls.521 `WebSearch` or other non-shell, non-MCP tool calls.

428 522

429`matcher` is applied to `tool_name` and matcher aliases. For file edits through523`matcher` is applied to `tool_name` and matcher aliases. For file edits through

430`apply_patch`, matchers can use `apply_patch`, `Edit`, or `Write`; hook input524`apply_patch`, `matcher` values can use `apply_patch`, `Edit`, or `Write`; hook input

431still reports `tool_name: "apply_patch"`.525still reports `tool_name: "apply_patch"`.

432 526

433Fields in addition to [Common input fields](#common-input-fields):527Fields in addition to [Common input fields](#common-input-fields):

434 528

436| --- | --- | --- |530| --------------- | ------------ | ---------------------------------------------------------------------------------------------------------- |

442 536

443Plain text on `stdout` is ignored.537Plain text on `stdout` is ignored.

477Fields in addition to [Common input fields](#common-input-fields):571Fields in addition to [Common input fields](#common-input-fields):

478 572

480| --- | --- | --- |574| --------- | -------- | ---------------------------------------------- |

483 577

515Fields in addition to [Common input fields](#common-input-fields):609Fields in addition to [Common input fields](#common-input-fields):

516 610

518| --- | --- | --- |612| ------------------------ | ---------------- | ------------------------------------------------- |

522 616

523`Stop` expects JSON on `stdout` when it exits `0`. Plain text output is invalid617`Stop` expects JSON on `stdout` when it exits `0`. Plain text output is invalid

524for this event.618for this event.

544 638

545## Schemas639## Schemas

546 640

641The linked `main` branch schemas may include hook fields that are not in the

642 current release. Use this page as the release behavior reference.

643

547If you need the exact current wire format, see the generated schemas in the644If you need the exact current wire format, see the generated schemas in the

548[Codex GitHub repository](https://github.com/openai/codex/tree/main/codex-rs/hooks/schema/generated).645[Codex GitHub repository](https://github.com/openai/codex/tree/main/codex-rs/hooks/schema/generated).

hooks.md Codex Docs, 2026-04-25 06:37 UTC → 2026-05-18 22:01 UTC