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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

Deferred tool references are passed to message normalization

Under the hood
Useful2 Signal2
Tools

When tools are deferred, stripped tool references are rewritten more consistently in messages.

What

When a request defers some tools, the list of tools kept and the references stripped out are now handed to the message normalizer, so stripped references are rewritten consistently.

Evidence

strippedToolReferenceKeys

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 →