Agent SDK reference - Python changedagent-sdk/python
Nearest release: v2.1.291, published under an hour after 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 6 Oct 2026 03:21 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 6 Oct 2026 03:37 UTC.
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20692069Parameters:
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2071* `input`: Strongly-typed hook input with discriminated unions based on `hook_event_name` (see [`HookInput`](#hookinput))
2071* `input`: Strongly typed hook input with discriminated unions based on `hook_event_name` (see [`HookInput`](#hookinput))
20722072* `tool_use_id`: Optional tool use identifier (for tool-related hooks)
20732073* `context`: Hook context with additional information
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