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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 v2.1.221

Stop-details refusal categories documented as an open set

Under the hood
Useful1 Signal0
Elsewhere

Docs now say refusal categories are an open list, so generated code stops assuming only two.

What

The "Stop details" quick reference no longer presents category: "cyber"|"bio"|null as the complete set of values.

Details
  • category is now described as an open set with additional examples, so generated code should not exhaustively switch on two values.
Evidence

an open set, e.g. "cyber", "bio", "reasoning_extraction", "frontier_llm", or null``

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 v2.1.221 →