Executable Contracts as Guardrails for AI-Generated Code

Short summary

Demonstrates using Specmatic executable contracts as guardrails for AI-generated code from tools like Claude Code and Cursor. The author integrated OpenAPI specs into a natural-language-to-SQL engine, enabling automatic contract testing that catches silent API shape changes made by AI agents. The spec becomes both the test suite and a mock server for frontend development.

• •Specmatic auto-generates contract tests from OpenAPI specs to catch AI code drift
• •AI agents silently renaming fields or changing response shapes is a major integration risk
• •Same contract serves as test suite for backend and stub for frontend development

Generated with AI, which can make mistakes.