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Dev Guide: How to Define Use Cases and Tool Contracts Before Building an AI Agent

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A developer tutorial series is documenting the process of building a support-ticket AI agent from scratch, without relying on any existing framework. Part 2 focuses on the first two steps: defining a bounded use case and writing formal tool contracts before any code is written. The use case pins down a single input format, a limited set of output states, exactly five tools, and a target resolution rate above 85%. Five tool contracts are specified with structured failure modes, idempotency handling, and explicit gating flags for actions like issuing refunds or sending emails that require human approval. Mock data with realistic commerce schemas is used so that swapping in a real backend later requires only a data-layer change, not a redesign of the tool contracts.

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Dev Guide: How to Define Use Cases and Tool Contracts Before Building an AI Agent · ShortSingh