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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.
63 lines
1.2 KiB
JSON
Generated
63 lines
1.2 KiB
JSON
Generated
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"transcript_path": {
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"$ref": "#/definitions/NullableString"
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},
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},
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