- In short
- Description is the discipline of telling the model precisely what you want. Applied to prompt design, a well-described prompt states its scope (what is in and out of bounds), its format (the exact output contract), and its constraints (rules that must never be violated), rather than leaving them for the model to infer. Underspecification is any requirement the output must meet that the prompt does not actually state; where the prompt is silent, the model fills the gap with its own assumption, and that assumption can vary across calls.
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