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fix(anthropic): map refusal and context-window stop reasons #316

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Merged
andreynering merged 1 commit into from
Jul 29, 2026
+26 −1
Merged

fix(anthropic): map refusal and context-window stop reasons #316

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4 changes: 3 additions & 1 deletion providers/anthropic/anthropic.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1268,10 +1268,12 @@ func mapFinishReason(finishReason string) fantasy.FinishReason {
switch finishReason {
case "end_turn", "pause_turn", "stop_sequence":
return fantasy.FinishReasonStop
case "max_tokens":
case "max_tokens", "model_context_window_exceeded":
return fantasy.FinishReasonLength
case "tool_use":
return fantasy.FinishReasonToolCalls
case "refusal":
return fantasy.FinishReasonContentFilter
default:
return fantasy.FinishReasonUnknown
}
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23 changes: 23 additions & 0 deletions providers/anthropic/anthropic_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3237,3 +3237,26 @@ func TestStream_TruncatedWithoutStopReason(t *testing.T) {
require.True(t, providerErr.IsRetryable())
require.ErrorIs(t, providerErr.Cause, io.ErrUnexpectedEOF)
}

func TestMapFinishReason(t *testing.T) {
t.Parallel()

tests := []struct {
reason string
expected fantasy.FinishReason
}{
{"end_turn", fantasy.FinishReasonStop},
{"pause_turn", fantasy.FinishReasonStop},
{"stop_sequence", fantasy.FinishReasonStop},
{"max_tokens", fantasy.FinishReasonLength},
{"model_context_window_exceeded", fantasy.FinishReasonLength},
{"tool_use", fantasy.FinishReasonToolCalls},
{"refusal", fantasy.FinishReasonContentFilter},
{"", fantasy.FinishReasonUnknown},
{"unrecognized_future_reason", fantasy.FinishReasonUnknown},
}

for _, tc := range tests {
require.Equal(t, tc.expected, mapFinishReason(tc.reason), "stop_reason %q", tc.reason)
}
}
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