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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 v2.1.238

Idle spare sessions clear their marker once they get work

Under the hood
Useful1 Signal3
Sessions

A pre-warmed spare session now clears its spare marker once real work arrives.

What

A session started as a spare now clears its spare flag in its process file when it becomes busy, and a poll clears it when a session state file appears in the session directory.

Details
  • Only sessions marked as born spare are affected.
  • The process-file writer now returns whether the write succeeded instead of discarding the result, and logs [concurrentSessions] updatePidFile failed: when it does not.
Evidence

[concurrentSessions] updatePidFile failed:

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

See this entry in the whole of v2.1.238 →