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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

Remote transcript upload detects rewritten history and skips suppressed sessions

You'll notice
Useful3 Signal2
Sessions

Remote transcript uploads track message ids, so compaction no longer loses or duplicates work.

What

Uploading a session transcript to the remote side no longer decides what is new by comparing a stored index against the message count, which could miss or duplicate work after a compaction. It now anchors on message ids and tracks which it has already seen, logging when it detects that history was rewritten.

Details
  • Messages are counted as seen without being uploaded once the session binding has detached.
  • Uploads of compaction pairs are skipped entirely for sessions carrying history-backfill suppression, with a log line saying so.
Evidence

[persist-remote] Skipping compact-pair upload: session carries history-backfill suppression

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 →