Files
codex/codex-rs/app-server-protocol/schema/json/v2/HookStartedNotification.json
Abhinav c6e7d564c3 Discover hooks bundled with plugins (#19705)
## Why

Plugins can bundle lifecycle hooks, but Codex previously only discovered
hooks from user, project, and managed config layers. This adds the
plugin discovery and runtime plumbing needed for plugin-bundled hooks
while keeping execution behind the `plugin_hooks` feature flag.

## What

- Discovers plugin hook sources from each plugin's default
`hooks/hooks.json`.
- Supports `plugin.json` manifest `hooks` entries as either relative
paths or inline hook objects.
- Plumbs discovered plugin hook sources through plugin loading into the
hook runtime when `plugin_hooks` is enabled.
- Marks plugin-originated hook runs as `HookSource::Plugin`.
- Injects `PLUGIN_ROOT` and `CLAUDE_PLUGIN_ROOT` into plugin hook
command environments.
- Updates generated schemas and hook source metadata for the plugin hook
source.

## Stack

1. This PR - openai/codex#19705
2. openai/codex#19778
3. openai/codex#19840
4. openai/codex#19882

## Reviewer Notes

- Core logic is in `codex-rs/core-plugins/src/loader.rs` and
`codex-rs/hooks/src/engine/discovery.rs`
- Moved existing / adding new tests to
`codex-rs/core-plugins/src/loader_tests.rs` hence the large diff there
- Otherwise mostly plumbing and minor schema updates

### Core Changes

The `codex-rs/core` changes are limited to wiring plugin hook support
into existing core flows:

- `core/src/session/session.rs` conditionally pulls effective plugin
hook sources and plugin hook load warnings from `PluginsManager` when
`plugin_hooks` is enabled, then passes them into `HooksConfig`.
- `core/src/hook_runtime.rs` adds the `plugin` metric tag for
`HookSource::Plugin`.
- `core/config.schema.json` picks up the new `plugin_hooks` feature
flag, and `core/src/plugins/manager_tests.rs` updates fixtures for the
added plugin hook fields.

---------

Co-authored-by: Codex <noreply@openai.com>
2026-04-28 14:17:18 -07:00

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{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"AbsolutePathBuf": {
"description": "A path that is guaranteed to be absolute and normalized (though it is not guaranteed to be canonicalized or exist on the filesystem).\n\nIMPORTANT: When deserializing an `AbsolutePathBuf`, a base path must be set using [AbsolutePathBufGuard::new]. If no base path is set, the deserialization will fail unless the path being deserialized is already absolute.",
"type": "string"
},
"HookEventName": {
"enum": [
"preToolUse",
"permissionRequest",
"postToolUse",
"sessionStart",
"userPromptSubmit",
"stop"
],
"type": "string"
},
"HookExecutionMode": {
"enum": [
"sync",
"async"
],
"type": "string"
},
"HookHandlerType": {
"enum": [
"command",
"prompt",
"agent"
],
"type": "string"
},
"HookOutputEntry": {
"properties": {
"kind": {
"$ref": "#/definitions/HookOutputEntryKind"
},
"text": {
"type": "string"
}
},
"required": [
"kind",
"text"
],
"type": "object"
},
"HookOutputEntryKind": {
"enum": [
"warning",
"stop",
"feedback",
"context",
"error"
],
"type": "string"
},
"HookRunStatus": {
"enum": [
"running",
"completed",
"failed",
"blocked",
"stopped"
],
"type": "string"
},
"HookRunSummary": {
"properties": {
"completedAt": {
"format": "int64",
"type": [
"integer",
"null"
]
},
"displayOrder": {
"format": "int64",
"type": "integer"
},
"durationMs": {
"format": "int64",
"type": [
"integer",
"null"
]
},
"entries": {
"items": {
"$ref": "#/definitions/HookOutputEntry"
},
"type": "array"
},
"eventName": {
"$ref": "#/definitions/HookEventName"
},
"executionMode": {
"$ref": "#/definitions/HookExecutionMode"
},
"handlerType": {
"$ref": "#/definitions/HookHandlerType"
},
"id": {
"type": "string"
},
"scope": {
"$ref": "#/definitions/HookScope"
},
"source": {
"allOf": [
{
"$ref": "#/definitions/HookSource"
}
],
"default": "unknown"
},
"sourcePath": {
"$ref": "#/definitions/AbsolutePathBuf"
},
"startedAt": {
"format": "int64",
"type": "integer"
},
"status": {
"$ref": "#/definitions/HookRunStatus"
},
"statusMessage": {
"type": [
"string",
"null"
]
}
},
"required": [
"displayOrder",
"entries",
"eventName",
"executionMode",
"handlerType",
"id",
"scope",
"sourcePath",
"startedAt",
"status"
],
"type": "object"
},
"HookScope": {
"enum": [
"thread",
"turn"
],
"type": "string"
},
"HookSource": {
"enum": [
"system",
"user",
"project",
"mdm",
"sessionFlags",
"plugin",
"legacyManagedConfigFile",
"legacyManagedConfigMdm",
"unknown"
],
"type": "string"
}
},
"properties": {
"run": {
"$ref": "#/definitions/HookRunSummary"
},
"threadId": {
"type": "string"
},
"turnId": {
"type": [
"string",
"null"
]
}
},
"required": [
"run",
"threadId"
],
"title": "HookStartedNotification",
"type": "object"
}