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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 v2.1.248

Fleet view refuses to open a session another terminal is running

You'll notice
Useful3 Signal2
Background Tasks

Fleet view refuses to open a session another terminal already has running.

What

Opening a job from the fleet view now checks whether another terminal already holds that session and shows "Can't open — this session is running in another terminal" instead of attaching. No flag guards it.

Details
  • The roster of live sessions is consulted before attaching; a holder means the open is refused outright rather than respawning.
  • The same message was already used by the peer-backend path; it now covers the local path too.
Evidence

Can't open \u2014 this session is running in another terminal

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →