Specification-Driven Development: How to Stop Vibe Coding and Actually Ship Production-Ready AI-Generated Code

You've seen the demos. An engineer types "build me a SaaS dashboard" into an AI coding agent, and in three minutes, a fully styled React app appears with auth, a database, and a payment flow. The crowd applauds. The tweet goes viral. Then you try the same thing on your actual project — the one with 200 files, a custom auth layer, three external API integrations, and a monorepo structure — and the agent confidently rewrites your database schema, deletes a critical middleware, and introduces four security vulnerabilities before you can hit Ctrl+C. This is the vibe coding gap. The distance between "works in a demo" and "works in production" isn't a tooling problem. It's a methodology problem. And the methodology that closes this gap has a name: Specification-Driven Development (SDD). SDD isn't about writing more documentation. It's about giving AI agents exactly the constraints they need to operate reliably — through spec files, test-first loops, and a four-phase workflow that replaces "g