Build a Spec-First AI Workflow That Prevents Hallucination Drift

What We're Building By the end of this tutorial, you'll have a spec-first AI development workflow that forces your AI coding assistant through a structured pipeline — specify, validate, plan, execute, verify — before it touches a single line of your code. Let me show you a pattern I use in every project now. It's changed how I work with AI pair programming, and it'll save you from a problem that's quietly costing developers hours of rework every week: hallucination drift . Hallucination drift is the compounding divergence between what you intended and what the AI builds when given unbounded freedom. It's not one bad generation. It's five prompts deep when you realize the AI has been solving a problem you never asked for. We'll set up the architectural pattern, walk through a concrete implementation using MCP (Model Context Protocol), and give you a working foundation you can adapt to your own projects. Prerequisites Before we start, make sure you have: Go 1.21+ installed ( download her