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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 v2.1.248

Tool references are filtered per call, not per tool name

You'll notice
Useful3 Signal2
Tools

Retracting a tool mid-conversation no longer wipes earlier valid calls to it.

What

When a tool is retracted partway through a conversation, references to it are now filtered by the specific call they belong to rather than by tool name alone, so earlier valid calls to a still-known tool are left intact.

Evidence

Filtering out tool_reference for unavailable tool:

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →