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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.238 ·

Idle spare sessions clear their marker once they get work

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

Under the hood Internal Changes
JSON All of v2.1.238
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SessionsArea: what it touches
Internal ChangesKind: in v2.1.238,
Internal ChangesSection of the release
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 →

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