Agent SDK reference - Python changedagent-sdk/python
Nearest release: v2.1.299, published 20 hours 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 13 Oct 2026 04:17 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 13 Oct 2026 04:37 UTC.
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31343134**Tool name:** `TodoWrite`
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31363136<Note>
3137 The following tools are available by default only on Claude 3.x models, Opus 4 through 4.7, Sonnet 4 through 4.6, and Haiku 4.5. On every other model, including model IDs Claude Code doesn't recognize, they aren't available unless you opt in:
3137 The following tools are available by default only on Claude Opus 4.7, Claude Sonnet 4.6, Claude Haiku 4.5, and earlier models. On every other model, including model IDs Claude Code doesn't recognize, they aren't available unless you opt in:
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31393139 * `TodoWrite`
31403140 * `TaskCreate`
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