What problem does it solve? A single model pass can under-cover a broad surface or lock in the first design shape it finds. This Skill runs several independent subagents in parallel on one work unit — competing implementations, partitioned coverage, or multi-model review — and reconciles their outputs into one defensible result. ## Core Features & Use Cases - Arena mode: Spawn competing attempts at the same design or implementation brief in isolated worktrees, judge them on a different model family, and graft the strongest ideas into one chosen candidate. - Swarm mode: Partition a broad coverage matrix, race, or exploration into slices, with each worker returning a compact PASS / ISSUES / BLOCKED result aggregated into one report. - Interrogate mode: Send the same diff to several independent reviewers, including a different-lab frontier model, then reconcile findings by root cause with refutation counting as much as extension. - Use Case: Before shipping a high-consequence PR, fan the diff out to three reviewers from different model families, deduplicate their findings by root cause, drop unsupported claims, and return consolidated findings ordered by severity. ## Quick Start Use the fan-out skill to have three independent reviewers, including one from a different model family, review this diff and reconcile their findings.