You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.317,
ImprovementsSection of the release
What
The SDK lets other programs run Claude Code and read its messages. When a requested model is refused and the session uses a different one, the warning message now includes an optional model_restriction object with:
requested_model: the model that was asked for
effective_model: the model actually used
at: when it happened, one of start, switch or resume
Why
A program built on the SDK can show its own wording for a model restriction instead of picking the details out of the warning text.
