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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 knows which sessions are open in another window

Under the hood
Useful2 Signal1
Background Tasks

The background-session list tracks which sessions another window is already sitting in.

What

The background-session list now tracks, for each job, whether some other Claude Code window is currently sitting in that session, and uses it to block opening it.

Details
  • The live-session poll builds a second map of interactive sessions belonging to other processes (kind interactive, a different process id, no parked job), stored as terminalHolders and read through terminalHolderOf(job).
  • Skipped for peer and remote backends.
  • No flag; always on.
Evidence

terminalHolders

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 →