Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Background TasksArea: what it touches
New FeaturesKind: in v2.1.248,
New FeaturesSection of the release
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.
