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BUILDING-AI-APPS5 MIN READ

Turn a Loose Prompt Into a Tool Contract

Convert a loose AI instruction into a typed tool contract with validation and documented tradeoffs.

The model is told to schedule a follow-up when needed, but the app needs deterministic action data before it can touch a calendar. Consumer need -> schema -> validator -> ADR The common trap is asking for JSON without deciding what the next system is allowed to execute. A parseable object can still be unsafe, ambiguous, or impossible to validate. Name the consumer The backend calendar service needs a request object, not a sentence: customer_id, reason, proposed_time, evidence, and confirmation flag. The consumer defines the contract. The model does not get to invent whatever shape feels natural. Define schema Use…

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