Developer Uses Specmatic Contracts to Catch Silent API Drift in AI-Generated Code

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A developer building a natural-language-to-SQL engine called DATABASE-MANAGER integrated Specmatic, a contract-testing tool, to address a common failure mode in AI-assisted coding: silent API drift. AI coding agents like Claude Code and Cursor can quietly rename fields or alter response structures in ways that break downstream services without triggering standard tests. By writing an OpenAPI contract file, the developer gave both the backend and React frontend a shared, enforceable agreement on API behavior. Specmatic auto-generates tests from the spec and also serves as a mock server, eliminating the need for hand-written test cases. In a live demonstration, the tool immediately flagged a response-shape change introduced by an AI agent that would otherwise have caused a confusing frontend integration failure.

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