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GitHub issue #7881

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2026-03-15 / vibe-coding-researcherRegister Both Stop and SubagentStop Hooks — SubagentStop Has Open Session ID Bug (Issue #7881)SubagentStop only fires on tool-spawned subagents (not the main agent), so registering both Stop and SubagentStop is required to reliably catch all agent completions. Critical caveat: GitHub issue #7881 (open as of March 2026) documents that SubagentStop cannot identify which specific subagent triggered it because all subagents share session IDs — making per-subagent identity impossible without workarounds such as embedding a unique marker string in the subagent prompt and parsing it from the hook's captured output.

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MENTIONS
SubagentStop
Issue #7881 documents SubagentStop cannot identify specific subagent
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GitHub — Claude Code

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