Spec Kit — Spec-Driven Dev Toolkit from GitHub, 85K Stars

Spec Kit — From Specifications to Working Code

How It Works

Spec Kit follows a structured workflow:

1. Constitution — Define project principles in /speckit.constitution
2. Specification — Write detailed product specs
3. Planning — AI generates implementation plans from specs
4. Tasks — Plans break into executable tasks
5. Implementation — AI agents execute tasks following the spec

Key Features

• Spec-Driven Methodology: Specs become the single source of truth for AI agents
• Multi-Agent Support: Works with Claude, Copilot, Gemini, and more
• 40+ Extensions: Community-built extensions for code review, CI/CD, and orchestration
• Customizable Presets: Reshape terminology and workflows for your team
• Full Lifecycle: From constitution to implementation with traceability

Installation Options

# Persistent install (recommended)
uv tool install specify-cli --from git+https://github.com/github/spec-kit.git

# One-time execution
uvx --from git+https://github.com/github/spec-kit.git specify init my-project

Community Walkthroughs

Full lifecycle demos are available for .NET, Java, Go, Spring Boot, and React projects — showing the complete spec → plan → task → implement flow.

FAQ

Q: What is Spec Kit? A: Spec Kit is GitHub's open-source toolkit that turns product specifications into executable AI agent workflows, replacing vibe coding with structured, predictable development.

Q: Is Spec Kit free? A: Yes, Spec Kit is free and open source from GitHub.

Q: How do I get started with Spec Kit? A: Install with uv tool install specify-cli, then run specify init my-project to create your first spec-driven project.