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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 v2.1.224

Compact summaries are flagged as synthetic in SDK output

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Useful3 Signal2
SDK Output

Compaction summaries are flagged synthetic in SDK and stream-json output so you can filter them.

stream-json
What

Messages produced by compaction are now marked synthetic in SDK and stream-json output, so consumers can filter them out alongside meta and transcript-only messages.

Details
  • The serialiser now calls a shared helper instead of computing the flag inline from meta and transcript-only checks.
  • A local-command result that trims to an empty string after its stdout and stderr wrappers are stripped now returns nothing instead of emitting an empty assistant message.
Evidence

isCompactSummary

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 v2.1.224 →