Hook timeout hangs tool call

“When a hook exceeds its timeout, Claude Code kills the hook's process tree, but the tool call does not proceed until the hook's stdout pipe reaches EOF.”

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/2821/file
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Hook timeout leaves tool call hung by orphaned process. On Windows, an orphaned grandchild still holds the hook's inherited stdout pipe, so it never reaches EOF and the session sits "busy" mid-turn.

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Where: Command hooks
Versions: 2.1.280 to 2.1.281
Platforms: Windows
How bad: Breaks a normal workflow.

Part of: Killed commands leave orphaned processes5 bugs

Orphaned processes after task stop8 people
Orphaned git.exe processes pile up5 people
Worktree isolation refused2 people
Stopping background Bash task leaves child process running, output file grows2 people

Original reports2, newest first

Sep 24, 2026[Windows] Hook timeout doesn't release the tool call while an orphaned descendant still holds the hook's stdout#96945
Sep 23, 2026[Windows] Hook timeout kills only the Git Bash launcher; an orphaned grandchild keeps the stdout pipe open and the session hangs mid-turn indefinitely#96476