Spec-Driven Development: The Complete Guide to the AI Coding Method
AI made code cheap to produce and easy to get wrong. Agents write plausible code that drifts from what you meant, invents APIs, and decays as projects grow — because nobody told them precisely what to build. Spec-Driven Development is the industry's answer: write a structured, versioned specification first, and let the agent implement against it. This is the complete, tool-agnostic reference.Not a thin overview — the full method: 40 pages, thirteen chapters, three real-world walkthroughs, an FAQ, a glossary, and a one-page quick reference.What you'll learn The four-phase loop — Specify, Plan, Tasks, Implement — with the review gates that keep intent intact What belongs in a spec, and how to write requirements agents actually follow EARS: the five requirement patterns born in aerospace that make specs unambiguous and testable The three levels of rigor — spec-first, spec-anchored, spec-as-source — and how to choose honestly The Constitution: standing principles that every phase consults, written once The honest tool map: GitHub Spec Kit, AWS Kiro, OpenSpec, Tessl, BMAD and more Right-sizing the ceremony — full rigor for features, a fast lane for one-line changes How SDD compares to TDD and plan mode, and how to adopt it on a team without drowning in process Who it's forAnyone who uses an AI coding agent and has felt the gap between what they asked for and what they got. You don't need any specific tool — SDD is a methodology, and this is a deliberately tool-agnostic treatment of it.What's inside40-page PDF, professionally formatted · three worked walkthroughs (full-rigor feature, fast-lane fix, brownfield adoption) · copy-ready spec, plan and task examples · FAQ, glossary and a quick-reference card built to live open beside you.New to the method? Grab the free Spec-Driven Development Cheat Sheet first, then come back for the complete reference.Part of the PromptMaster series on getting the most from AI coding tools — alongside the AGENTS.md, CLAUDE.md and SKILL.md guides.
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