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# What `SubagentStart` runs once when Codex creates a thread-spawned subagent, before that child sends its first model request. Thread-spawned subagents use `SubagentStart` instead of the normal root-agent `SessionStart` hook. Configured handlers match on the subagent `agent_type`, using the same value passed to `spawn_agent`. When no agent type is specified, Codex uses the default agent type. Hook input includes the normal session-start fields plus: - `agent_id`: the child thread id. - `agent_type`: the resolved subagent type. `SubagentStart` may return `hookSpecificOutput.additionalContext`. That context is added to the child conversation before the first model request. # Lifecycle Scope Only thread-spawned subagents run `SubagentStart`. Internal/system subagents such as Review, Compact, MemoryConsolidation, and Other do not run normal `SessionStart` hooks and do not run `SubagentStart`. This avoids exposing synthetic matcher labels for internal implementation paths. Also the `SessionStart` hook no longer fires for subagents, this matches behavior with other coding agents' implementation # Stack 1. This PR: add `SubagentStart`. 2. #22873: add `SubagentStop`. 3. #22882: add subagent identity to normal hook inputs.
64 lines
1.3 KiB
JSON
Generated
64 lines
1.3 KiB
JSON
Generated
{
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"$schema": "http://json-schema.org/draft-07/schema#",
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"additionalProperties": false,
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"definitions": {
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"HookEventNameWire": {
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"enum": [
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"PreToolUse",
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"PermissionRequest",
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"PostToolUse",
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"PreCompact",
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"PostCompact",
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"SessionStart",
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"UserPromptSubmit",
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"SubagentStart",
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"Stop"
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],
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"type": "string"
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},
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"SessionStartHookSpecificOutputWire": {
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"additionalProperties": false,
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"properties": {
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"additionalContext": {
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"default": null,
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"type": "string"
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},
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"hookEventName": {
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"$ref": "#/definitions/HookEventNameWire"
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}
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},
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"required": [
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"hookEventName"
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],
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"type": "object"
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}
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},
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"properties": {
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"continue": {
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"default": true,
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"type": "boolean"
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},
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"hookSpecificOutput": {
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"allOf": [
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{
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"$ref": "#/definitions/SessionStartHookSpecificOutputWire"
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}
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],
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"default": null
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},
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"systemMessage": {
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"default": null,
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"type": "string"
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}
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},
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"title": "subagent-start.command.output",
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"type": "object"
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} |