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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 v2.1.227

Headline-only classification skips the model call

You'll notice
Useful2 Signal2
Performance not in their notes

Classification skips the model call when no summary is needed, saving tokens.

CLAUDE_CODE_CLASSIFIER_SUMMARY
What

The classifier now picks the cheap built-in heuristic whenever the requested output does not include a summary or state, before it consults CLAUDE_CODE_CLASSIFIER_SUMMARY. Only surfaces that genuinely need a summary pay for a model-backed call.

Evidence

CLAUDE_CODE_CLASSIFIER_SUMMARY

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 v2.1.227 →