You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
SessionsArea: what it touches
ImprovementsKind: in v2.1.323,
ImprovementsSection of the release
What
A background session keeps working while you do something else. Before moving a session to the background, Claude Code now checks that the service it relies on is available. If the check fails, it refuses with "Couldn't start a background session". The exit dialog reports the refusal.
Pressing the left arrow to open the agents view is blocked in the same way, with a message that begins "Cannot open agents". Before, nothing was checked in advance, and a problem showed up only as a failed start.
Why
You can now be refused when you try to background a session, and the message tells you why.
