fix: #3055 surface model refusals during run resolution#3057
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This was referenced May 1, 2026
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This pull request resolves #3055 by making model refusals a first-class run error instead of letting structured-output runs retry until
MaxTurnsExceeded.It adds
ModelRefusalError, detectsResponseOutputRefusalduring final-output resolution, and supportserror_handlers["model_refusal"]so applications can return a controlled fallback final output. It also threads refusal handling through streaming and non-streaming runs, updates tests for default refusal exits and handler fallbacks, and documents the new error handler key indocs/running_agents.md.Behavior note: model refusals now default to
ModelRefusalErrorrather than becoming an empty plain-text output or an unproductive structured-output retry loop.