Fission-AI/OpenSpec: Spec-Driven Development Framework for 21 AI Coding Tools Reaches 34,838 Stars

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OpenSpec adds a lightweight spec layer so you agree on what to build before any code is written — solving the 'vibe coding amnesia' problem where requirements scatter across chat logs and context windows fill up. Uses Markdown-based filesystem storage so specs live alongside code in Git as living documentation. Supports 21 AI tools including Claude Code, Cursor, Windsurf, Gemini CLI, GitHub Copilot, Amazon Q, Cline, RooCode, and Codex. Designed for existing codebase evolution (1→n), not greenfield-only.