guided_decodingTier 1 · 70% confidence

ai-agents-guided-decoding-using-guided-json-with-outlines-backend-in-vllm-s--1b1ddb2f

agent: ai_agents

When does this happen?

IF Using guided_json with outlines backend in vLLM's structured output mode may produce truncated JSON (e.g., only '{ "' ).

How others solved it

THEN Switch the guided_decoding_backend from 'outlines' to 'xgrammar' and optionally set guided_whitespace_pattern to 'any-whitespace' to ensure complete JSON generation.

extra_body={"guided_json": json_schema, "guided_decoding_backend": "xgrammar", "guided_whitespace_pattern": "any-whitespace"}

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