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Specify the fields, types, allowed values, and missing-value behavior before generating output. A date string, a numerical amount, and a list of source identifiers need different validation. Define whether additional fields are accepted and whether an absent value differs from an explicit null. Providers vary in how they enforce structure. Some constrain generation against a supported schema; others rely on prompting and validation afterward. Check the supported schema features and still handle refusals, truncation, timeouts, and malformed responses at the application boundary. Validate meaning after shape. An extracted total should agree with the document and any applicable arithmetic. A cited source identifier must refer to a source actually supplied. A schema cannot ordinarily decide these relationships by type checking alone. Keep the schema version with stored outputs and define compatibility rules before changing it. Downstream systems should reject or explicitly adapt incompatible versions. Avoid silently substituting fabricated defaults when a required piece of evidence is absent.