What is Spec-Driven Development?
TL;DR
A 2026 development paradigm where engineers hand a detailed spec to AI coding agents that implement, test, and refactor.
Spec-Driven Development: Definition & Explanation
Spec-Driven Development (SDD) is a 2026 trend in which engineers write a detailed natural-language specification (spec.md) covering functional requirements, non-functional requirements, API design, data models, error handling, and test criteria, then hand it to an AI coding agent (Claude Code, Devin, Cursor, Cline, Aider, etc.) that performs code generation, test creation, and refactoring autonomously. Frameworks like GitHub Spec Kit, Anthropic's official patterns, and AWS Kiro promote the approach. Whereas Vibe Coding builds incrementally through interactive dialogue, SDD locks in a detailed spec up front and lets the agent produce a complete implementation in one pass. Benefits: requirements discipline is restored, multiple agents and teams can develop in parallel, the spec doubles as living design documentation, and AI runaway (infinite loops, scope creep) is curbed. SDD pairs especially well with Claude Code 4.7 and the Gemini 3 coding agents, and is becoming the standard practice for enterprise development.