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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 v2.1.219

Compaction hook plumbing reworked

Under the hood
Useful2 Signal0
Compaction

Automatic compaction passes more context when rebuilding attachments and handles failures on a dedicated path.

What

The reactive-compaction path passes more context into attachment building and handles failures through a dedicated path.

Details
  • The attachment builder is now called with the message list and an agent-context descriptor in addition to its previous arguments.
  • Errors go through a dedicated handler rather than a generic catch that logged and returned empty attachments.
Evidence

reactive_compact

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 v2.1.219 →