9 pages for subagentstart.

How the agent loop works Claude Code CLI · in the page agent-sdk/agent-loop …inishes | Validate the result, save session state | | `SubagentStart` / `SubagentStop` | When a subagent spawns or completes | Track and aggregate parallel task results | | `PreCompact… Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …| | `SubagentStart` | Yes | Yes | Subagent initialization… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …compaction "Notification", # Called for notification events "SubagentStart", # Called when a subagent starts "PermissionRequest", # Called when a permission decision is needed ] ``` <N… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …| "SessionStart" | "SessionEnd" | "Stop" | "StopFailure" | "SubagentStart" | "SubagentStop" | "PreCompact" | "PostCompact" | "PermissionRequest" | "PermissionDenied" | "Setup"… Claude Code changelog Claude Code CLI · in the page changelog …e command applies to the lead * Fixed `SessionStart`, `Setup`, and `SubagentStart` hooks silently hiding stderr when exiting with code 2 — the error is now shown in the transcript * Fixed `claude… Hooks reference Claude Code CLI · in the page hooks …e, PermissionRequest, PostToolUse, PostToolUseFailure, PostToolBatch, SubagentStart/Stop, TaskCreated, TaskCompleted), and Stop or StopFailure, followed by TeammateIdle, PreCompact, PostCompact, and S… Automate actions with hooks Claude Code CLI · in the page hooks-guide …| | `SubagentStart` | When a subagent is spawned… Plugins reference Claude Code CLI · in the page plugins-reference …| | `SubagentStart` | When a subagent is spawned… Create custom subagents Claude Code CLI · in the page sub-agents …dentifier using lowercase letters and hyphens. [Hooks](/docs/en/hooks#subagentstart) receive this value as `agent_type`. The filename doesn't have to match. Names can't contain `:`, which is reserved…