OpenSpec – Spec-Driven Development for AI Coding Assistants

OpenSpec is a lightweight, spec-driven framework for coding agents and CLIs. It's universal, open source, and requires no API keys or MCP (Model Context Protocol) to function.

OpenSpec provides a standardized specification format that coding agents can understand and execute. It defines tasks, tools, and workflows in a way that's consistent across different AI platforms and tools.

No! OpenSpec is designed to work without API keys. It's a completely local, open-source solution that doesn't depend on external services or authentication.

Cursor, Claude Code, Codex, Github Copilot, opencode, Windsurf, Kilo Code have native support with custom slash commands. Many more tools like Gemini CLI, Amp, Roo Code, Auggie CLI, and Qwen Code are coming soon.

Yes! OpenSpec is completely open source. You can view the source code, contribute, and even fork it for your own needs. Check out our GitHub repository to get started.

Install OpenSpec globally with npm: npm install -g @fission-ai/openspec@latest. Then check your tool's documentation for OpenSpec-specific commands or start using it with supported coding agents.