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[Responses] Return 400 for unsupported forced tool_choice on Harmony #8

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[Responses] Return 400 for unsupported forced tool_choice on Harmony #8

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5 changes: 3 additions & 2 deletions vllm/entrypoints/openai/responses/serving.py
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Original file line number Diff line number Diff line change
Expand Up @@ -792,9 +792,10 @@ def _make_request_with_harmony(
):
has_unsupported_tool_choice = request.tool_choice not in ("auto", "none")
if has_unsupported_tool_choice and not is_required_function_call:
raise NotImplementedError(
raise VLLMValidationError(
"Only 'auto', 'none', or 'required' (with function tools) "
"tool_choice is supported in response API with Harmony"
"tool_choice is supported in response API with Harmony",
parameter="tool_choice",
)

arrival_time = time.time()
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