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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.233 14 Aug 2026

SDK hosts can opt into the todo tools

Not switched on

Useful2 Signal3

SDK

Apps embedding Claude Code can now switch todo tools on through a launch option.

An SDK launch option for todo tools, off unless the host sets it, with no user-facing setting.

What

Applications embedding Claude Code can now switch the todo tools on through a new launch option, mirroring the existing opt-in for search tools. Off unless the host sets it; there is no user-facing setting.

Details

The value is part of the cache key for the memoised tool list, so flipping it re-derives which tools are available rather than serving a stale list.

Evidence

replaceTodoToolsOptIn

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.233 →