You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
ImprovementsKind: in v2.1.274,
ImprovementsSection of the release
What
When Claude Code tries to spawn a subagent as a pane-based teammate (a teammate running in its own terminal pane), it now checks whether the requested agent type was registered at runtime by a plugin. If so, it refuses and throws an error instead of trying to open a pane, telling you to spawn that agent with a different tool or to use an in-process teammate instead.
Why
This prevents a broken or unsupported launch attempt for plugin-registered agent types in pane mode, and points you toward the alternatives that do work: another spawning tool or in-process teammates.
