- In short
- Structural enforcement builds a high-stakes guardrail into the output contract itself rather than relying only on a prose instruction. A guardrail stated only as prose (for example, "never promise a refund") is probabilistic, not guaranteed; a structural version makes the constraint part of the schema or a required field the model cannot populate with a forbidden claim, backed by downstream validation. An underspecified guardrail is worse than no guardrail because it creates the appearance of a control without the substance.
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