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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

Compaction boundaries can appear in streamed output

You'll notice
Useful2 Signal2
Compaction

Compaction boundary markers can now show up in streamed output.

What

When a conversation is compacted, the marker for that boundary is now eligible to be emitted in streaming output alongside local command messages.

Details
  • The filter accepts system messages with subtype compact_boundary; previously only local_command passed.
  • A predicate can be registered to suppress them; with nothing registered it defaults to allowing them, so in this build they are emitted.
Evidence

compact_boundary

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 →