Subagent lifecycle
Hooks for when subagents are spawned and when they complete — observe delegation, aggregate results, enforce policies
Lifecycle Hooks Hooks & Lifecycle
Supported
Partial
No
Unknown
Cline CLI Current · Jun 2026 
Codex CLI Current · Jun 2026 
GitHub Copilot CLI Current · Jun 2026 
2.1.147 - 2.1.197
3.0.10 - 3.0.34
0.133.0 - 0.142.4
1.0.52 - 1.0.66
3.7 - 3.9
2.1.30 - 2.1.146
3.0.0 - 3.0.9
0.95.0 - 0.132.0
0.0.401 - 1.0.51
2.5 - 3.2
2.1.16 - 2.1.29
—
0.89.0 - 0.94.0
0.0.389 - 0.0.400
2.4
2.0.43 - 2.1.15
—
0.59.0 - 0.88.0
0.0.374 - 0.0.388
2.0
1.0.41 - 2.0.42
—
0.2.0 - 0.58.0
—
1.2 - 2.0
0.2.31 - 1.0.40
—
—
—
0.45 - 1.0
Supported by 4 of 5 agents.
HoverTap any cell for version details.
Agent event mapping
Sub-capabilities
- Subagent start: observe or veto when a parent agent delegates to a child
- Subagent stop: receive results, enforce quality gates on delegated work
- Claude Code: also has TeammateIdle for multi-agent workflows
- Cursor: subagentStart is blocking (can veto); subagentStop includes summary, duration, modified_files