# Arena

> Spawn parallel candidate implementations for the same task, cross-judge, and graft the best parts into the winning base. Use when exploring competing designs or critical artifacts.

- Skill: `theonlyfusioncube/arena` (Agent Skill)
- Install (CLI): `npx skillmds@latest add theonlyfusioncube/arena`
- Raw SKILL.md: https://api.skillmd.com/api/skills/theonlyfusioncube/arena/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: TheOnlyFusionCube (https://skillmd.com/u/theonlyfusioncube)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/theonlyfusioncube/arena

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# Arena

Fan out N parallel attempts at the same task, score them against concrete criteria, pick a base, and graft the best ideas from the others.

1. Frame: Define the artifact contract, 3-6 concrete rubric criteria, and isolated candidate output paths.
2. Fan out: Run parallel candidate attempts on isolated workers (via `delegate` when supported, or labeled sequential passes). Require a concrete artifact and short rationale from each.
3. Cross-judge: Score each candidate against the rubric criteria, compare trade-offs, and recommend the strongest base.
4. Pick a base: Select the implementation that is cleanest, easiest to maintain, and safest under domain invariants.
5. Graft: Port the best independent ideas or edge-case handling from losing candidates into the base by hand.
6. Verify: Validate the synthesized result against the full test and verification suite.