Files
codex/codex-rs/hooks/schema/generated/subagent-stop.command.input.schema.json
Abhinav eee3e60db3 Add SubagentStop hook (#22873)
# What

<img width="1792" height="1024" alt="image"
src="https://github.com/user-attachments/assets/8f81d232-5813-4994-a61d-e42a05a93a3e"
/>

`SubagentStop` runs when a thread-spawned subagent turn is about to
finish. Thread-spawned subagents use `SubagentStop` instead of the
normal root-agent `Stop` hook.

Configured handlers match on `agent_type`. Hook input includes the
normal stop fields plus:

- `agent_id`: the child thread id.
- `agent_type`: the resolved subagent type.
- `agent_transcript_path`: the child subagent transcript path.
- `transcript_path`: the parent thread transcript path.
- `last_assistant_message`: the final assistant message from the child
turn, when available.
- `stop_hook_active`: `true` when the child is already continuing
because an earlier stop-like hook blocked completion.

`SubagentStop` shares the same completion-control semantics as `Stop`,
scoped to the child turn:

- No decision allows the child turn to finish.
- `decision: "block"` with a non-empty `reason` records that reason as
hook feedback and continues the child with that prompt.
- `continue: false` stops the child turn. If `stopReason` is present,
Codex surfaces it as the stop reason.

# Lifecycle Scope

Only thread-spawned subagents run `SubagentStop`.

Internal/system subagents such as Review, Compact, MemoryConsolidation,
and Other do not run normal `Stop` hooks and do not run `SubagentStop`.
This avoids exposing synthetic matcher labels for internal
implementation paths.

# Stack

1. #22782: add `SubagentStart`.
2. This PR: add `SubagentStop`.
3. #22882: add subagent identity to normal hook inputs.
2026-05-20 14:59:41 -07:00

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Generated

{
"$schema": "http://json-schema.org/draft-07/schema#",
"additionalProperties": false,
"definitions": {
"NullableString": {
"type": [
"string",
"null"
]
}
},
"properties": {
"agent_id": {
"type": "string"
},
"agent_transcript_path": {
"$ref": "#/definitions/NullableString"
},
"agent_type": {
"type": "string"
},
"cwd": {
"type": "string"
},
"hook_event_name": {
"const": "SubagentStop",
"type": "string"
},
"last_assistant_message": {
"$ref": "#/definitions/NullableString"
},
"model": {
"type": "string"
},
"permission_mode": {
"enum": [
"default",
"acceptEdits",
"plan",
"dontAsk",
"bypassPermissions"
],
"type": "string"
},
"session_id": {
"type": "string"
},
"stop_hook_active": {
"type": "boolean"
},
"transcript_path": {
"$ref": "#/definitions/NullableString"
},
"turn_id": {
"description": "Codex extension: expose the active turn id to internal turn-scoped hooks.",
"type": "string"
}
},
"required": [
"agent_id",
"agent_transcript_path",
"agent_type",
"cwd",
"hook_event_name",
"last_assistant_message",
"model",
"permission_mode",
"session_id",
"stop_hook_active",
"transcript_path",
"turn_id"
],
"title": "subagent-stop.command.input",
"type": "object"
}