cc-sdd 🤖 Agent Open source

What it does

cc-sdd installs a spec-driven development workflow as Agent Skills, turning approved specifications into long-running autonomous implementation. One command sets up an agentic SDLC: discovery, requirements, design, tasks, and then autonomous implementation with per-task independent review. It treats the spec as a contract that makes boundaries between parts of the system explicit, so humans approve at phase gates while the agent carries tasks through. The approach is inspired by Kiro IDE, and existing Kiro specs remain compatible.

What is inside

A set of seventeen skills, identical across every supported agent and loaded on demand. The entry point /kiro-discovery routes new work into extending a spec, implementing directly, creating one spec, or decomposing into several. Spec skills produce EARS-format requirements.md, a design.md with Mermaid diagrams and a File Structure Plan, and a tasks.md with boundary and dependency annotations. /kiro-impl then runs tasks autonomously with test-driven RED to GREEN cycles behind feature flags, an independent reviewer pass, and an auto-debug pass that investigates root causes in a clean context when a task is blocked. /kiro-spec-batch turns a roadmap into multiple specs with cross-spec review. Templates and rules under a settings directory are editable per team.

Works with

Claude Code and Codex (stable), plus Cursor, GitHub Copilot, Windsurf, OpenCode, Gemini CLI, and Google Antigravity (beta). Thirteen document languages are supported.

How to install

npx cc-sdd@latest

Maintenance and safety

MIT licensed and active. The installer writes skills and templates into your project; a --dry-run flag previews changes first. Subagents are spawned through each platform's native mechanism, with no external service dependencies. Autonomous implementation edits code, so review the phase gates.

Who should use it

Teams that want disciplined, spec-first development with autonomous per-task implementation and review, across more than one coding agent.