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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 v2.1.225

Compaction payloads clamped alongside preserved event ids

You'll notice
Useful3 Signal0
Compaction

Compaction now trims the saved conversation payload to match the preserved message list, avoiding mismatches.

What

When preserved event ids exceed the cap, the compaction payload itself is now trimmed to match, rather than only the id list.

Details
  • The internal event writer rewrites compactMetadata.preservedMessages.uuids to the last N and adjusts the preserved segment.
  • Whether that rewrite happened is reported as payloadClamped on the existing tengu_ccr_preserved_event_ids_clamped event.
Evidence

tengu_ccr_preserved_event_ids_clamped

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 v2.1.225 →