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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 v2.1.251 ·

Clear message when resuming a session that is still running

Resuming a session that is still running now offers to attach, stop or fork it.

You'll notice New Features
JSON All of v2.1.251
You'll noticeTier: how much it should matter to you
4Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SessionsArea: what it touches
New FeaturesKind: in v2.1.251,
What probably matters to youSection of the release
What

Trying to resume or fork a session that is currently running as a background session now explains the situation and gives the options: attach to it, stop it, or fork a copy. Previously this surfaced as a generic error.

Details
  • Triggered whenever the target session is detected as an active background job. Available to everyone, no flag.
Evidence

That session is still running as a background session

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

See this entry in the whole of v2.1.251 →

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