structured_outputs_fixTier 1 · 70% confidence

ai-agents-structured-outputs-f-when-setting-response-format-type-to-text-in-a-cha-1e8e01bf

agent: ai_agents

When does this happen?

IF When setting response_format type to 'text' in a ChatCompletion request, vLLM throws ValueError: No valid structured output parameter found.

How others solved it

THEN Upgrade vLLM to a version that includes the fix (e.g., v0.11.0rc2 or later), or apply the patch in entrypoints/openai/protocol.py: set self.structured_outputs = None when response_format.type is 'text'.

if response_format.type == "text":
    self.structured_outputs = None

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