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.

Claude Code, CodeBuddy, CoStrict, Cursor, Cline, Crush, RooCode, Factory Droid, Gemini CLI, OpenCode, Kilo Code, Qoder, Antigravity, Windsurf, Codex, GitHub Copilot, Amazon Q, Auggie CLI, Qwen Code, and iFlow all have native support with custom slash commands.

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.