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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 ·

Resuming an already-running subagent now fails loudly

Resuming a subagent that is already running now errors instead of starting a duplicate.

You'll notice Improvements
JSON All of v2.1.238
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SubagentsArea: what it touches
ImprovementsKind: in v2.1.238,
ImprovementsSection of the release
What

Asking to resume a subagent that is already running, or already mid-resume, throws instead of quietly starting a second copy. Completion, failure and kill each now publish a settled event, flagging whether messages were left stranded.

Details
  • Failures reading the state a resume needs are classified, so a transient read error surfaces as its own error type rather than a generic failure.
Evidence

is already running or being resumed

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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