Agent SDK reference - Python changedagent-sdk/python
Nearest release: v2.1.318, published an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 3 Nov 2026 23:05 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 3 Nov 2026 23:07 UTC.
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21572157 None # Timeout in seconds. When omitted, the per-event default applies:
21582158 # 600 for most events, 30 for UserPromptSubmit
21592159 )
2160 on_failure: Literal["continue", "block"] | None = (
2161 None # "block" blocks the action when a callback fails
2162 )
21602163```
2164
2165To decide what `on_failure` covers, see [Block the action when a callback fails](https://code.claude.com/docs/en/agent-sdk/hooks.md#block-the-action-when-a-callback-fails).
21612166
21622167### `HookInput`
21632168
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