Structured Output That Doesn't Break: JSON Schemas, Validation, and Smart Retries
TL;DR Unconstrained LLM responses frequently break downstream software through schema drift, malformed JSON syntax, and invalid property types. Constrained decoding enforces strict JSON schemas at the token level by masking invalid tokens during inference, preventing syntactic corruption. Constrained decoding alone cannot prevent semantic or business-rule violations, requiring a layered…
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