fix(anthropic): map refusal and context-window stop reasons - #316
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andreynering merged 1 commit intoJul 29, 2026
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The Anthropic API can end a response with stop_reason "refusal" (safety classifier intervention) or "model_context_window_exceeded", but both fell through to FinishReasonUnknown, leaving clients unable to distinguish them from a missing stop reason. Map "refusal" to FinishReasonContentFilter, matching how the OpenAI and Google providers already surface their native content-filter stops, and map "model_context_window_exceeded" to FinishReasonLength alongside "max_tokens". 💘 Generated with Crush Assisted-by: Kimi K3 (max thinking) via Crush <crush@charm.land>
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@taciturnaxolotl : poke for review? |
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One thing that's been annoying me about working with fable-5 in crush is that if you trip over anthropic's content classifier (so fable is refusing to process the API calls), crush will just end the turn with no indication of what's gone wrong.
This is easy to fix, because FinishReasonContentFilter is a thing that fantasy already supports -- it just doesn't understand Anthropic's flavor of the error.
The core fix is a 2-line diff. While we're here it's probably also worth writing a unit test and extending the coverage of FinishReasonLength.