This skill decomposes large tasks into independent units and coordinates parallel execution. It is a PLANNING + COORDINATION tool — it does NOT spawn agents directly. Agents are spawned via Claude Code's built-in /batch command (git worktree-based parallel).
Before writing SPEC.md, the AI conducts an adversarial debate session with the user to challenge assumptions, surface hidden edge cases, and ensure the spec is airtight. SPEC is not just written — it is debated, questioned, and hardened until both AI and user agree it's ready.