Fission-AI/OpenSpec: Spec-Driven Development Framework for AI Coding Assistants Reaches 41K Stars — Supports 21 Tools Including Claude Code and Cursor

GitHub·medium signal

OpenSpec adds a lightweight spec layer before AI coding begins, addressing the 'vibe coding' problem where requirements scatter across unstructured chat logs. It uses a 'brownfield-first' strategy for existing codebases (1→n evolution, not 0→1), with delta specs showing what's changing. Supports 21 AI tools including Claude Code, Cursor, Windsurf, Gemini CLI, and GitHub Copilot. Trending at 139 stars/day at 41K total.