cc-sdd
Turn approved specs into long-running autonomous implementation. A minimal, adaptable SDD harness with Agent Skills for Claude Code, Codex, Cursor, Copilot, Windsurf, OpenCode, Gemini CLI, and Antigravity.
cc-sdd is an agent skill package that adds spec-driven development capabilities to AI coding assistants through 17 installable skills. It transforms approved specifications into autonomous implementation using a structured workflow: discovery, requirements gathering, design documentation, task breakdown, and long-running autonomous coding with test-driven development. The package works across eight major AI coding platforms including Claude Code, Codex, Cursor, GitHub Copilot, and Windsurf, providing each with the same skill set for boundary-based development at team scale.
Key Features
Use Cases
- 01Adding a new feature to an existing codebase with spec-driven discovery and implementation
- 02Building a product-sized feature like photo albums with upload, tagging, and sharing from initial idea to tested code
- 03Breaking down large initiatives into multiple coordinated specs with dependency tracking
- 04Extending legacy systems by discovering gaps and generating boundary-respecting implementation tasks
- 05Parallel development at team scale using explicit contracts between system components
- 06Implementing changes autonomously with per-task TDD, feature flags, and independent code review
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cc-sdd — FAQ
What is cc-sdd?+
cc-sdd is an npm package that installs 17 agent skills into AI coding assistants, enabling spec-driven development workflows from discovery through autonomous implementation. It treats specs as contracts between system parts and uses boundary-first design to enable parallel development.
How do I install cc-sdd agent skills?+
Run npx cc-sdd@latest in your project directory to install Claude Code skills by default, or add flags like --codex-skills, --cursor-skills, or --copilot-skills to target other agents. The installer adds skill files to your project that the AI agent loads on demand.
Which AI coding agents work with cc-sdd?+
cc-sdd supports Claude Code, Codex, Cursor IDE, GitHub Copilot, Windsurf IDE, OpenCode, Gemini CLI, and Antigravity. Claude Code and Codex are stable; the others are in beta with identical features but less real-world usage.
Do I need API keys or external dependencies?+
No external dependencies or additional API keys are required. cc-sdd spawns subagents through each platform's native primitives and all processing happens within your AI coding agent.
Is cc-sdd free to use?+
Yes, cc-sdd is open source under the MIT License and free to use. You only need access to one of the supported AI coding agents.
What does the kiro-impl skill do?+
The kiro-impl skill runs long-running autonomous implementation, processing one task per iteration with a fresh implementer using TDD behind feature flags, an independent reviewer, and auto-debug that investigates root causes when the implementer is blocked or review fails twice.
How do I install cc-sdd?+
Open the source repository on GitHub and follow its README. cc-sdd is a skill — MCP Agents Market links you directly to the official repo.
Is cc-sdd free?+
cc-sdd is an open-source project hosted on GitHub. Check the repository for its license and any usage requirements.