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5 Undocumented Rules for Gemini Structured Output, Measured in Production

We run a document extraction pipeline on Gemini with a native responseSchema attached, not a "please reply with JSON" instruction in the prompt text.

  • Order required properties as per required array, then optional properties
  • Measure order effect on gemini-3-flash-preview model, adjust if needed
  • Enum value count limit exists, exceeded schemas rejected in production

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