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Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 4/5 agents 427 findings $12.75 so far

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 v2.1.42 13 Feb 2026

Session Conflict Resolution

What

Better handling of session 409 conflicts with server-side sync.

Details

Adopts server's lastUuid from headers when conflicts occur
Re-fetches entries to ensure consistency
Logs detailed sync information for debugging

Evidence

Session 409 handler (search for "Session 409: adopting server lastUuid")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.42 →