cc-sdd transforms approved specifications into long-running autonomous implementation using a minimal SDD harness. It installs as Agent Skills across Claude Code, Codex, Cursor, Copilot, Windsurf, OpenCode, Gemini CLI, and Kiro, providing discovery, requirements, design, and task management capabilities. Each implementation task runs with TDD (RED → GREEN), an independent reviewer, and an auto-debug pass that investigates root causes in clean context. The system propagates learnings between tasks via Implementation Notes in tasks.md.