Tool Contract

A tool contract is the schema a tool exposes to a model — its parameter names, types, required fields, and whatever enums or patterns constrain them. A loose contract lets a model fill an ambiguous field with a plausible-looking guess instead of a real value; a tight one, validated server-side, is what actually stops a hallucinated argument from reaching execution. It's the one piece of documentation a model reads before every call, so it has to carry everything a new hire would otherwise ask about in person.

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