Open-source spec-driven framework that helps developers plan complex features in lightweight Markdown documents used as durable context for AI coding agents.
OpenSpec is a lightweight, configurable framework for creating and managing software specifications that keep teams and AI coding agents aligned as work evolves. The workflow covers exploring the codebase, drafting proposals and specs, implementing tasks from the spec, verifying alignment, and archiving completed changes via slash commands. With 66.9k GitHub stars and over 265,000 monthly developers, it is compatible with Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode, and 30+ other AI coding assistants. Install via npm with a single command. OpenSpec is a product of OpenSpec.
For people
For agents