Hooks reference changedhooks
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Upstream edited this page at 9 Oct 2026 00:30 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 9 Oct 2026 00:37 UTC.
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39713971Async hooks have additional constraints compared to synchronous hooks:
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39733973* Hook output is delivered on the next conversation turn. If the session is idle, the response waits until the next user interaction. Exception: an `asyncRewake` hook that exits with code 2 wakes Claude immediately even when the session is idle.
3974* Each execution creates a separate background process. There is no deduplication across multiple firings of the same async hook.
3974* Each execution creates a separate background process.
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39763976## Security considerations
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