You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SubagentsArea: what it touches
ImprovementsKind: in v2.1.305,
ImprovementsSection of the release
What
A subagent is a helper agent that Claude starts to handle part of a task and that reports back with a result. When a subagent's model cannot be used, it can switch to a backup model from its fallback model chain.
When that happens, the subagent's result now begins with a warning naming the model it switched to and saying that its earlier model could not be used.
Why
You can now tell when a subagent ran on a different model than the one it started with, instead of the switch going unnoticed.
