Claude Productivity Plugin
Keeps a task list and a memory of your colleagues, projects and jargon for Claude
by Anthropic
Arena
by Jake SchincariolSkillGet organised
Runs many Claude sub-agents on the same task and keeps the answer that survives a bracket
The problem it solves
You've asked Claude for the same headline four times and every version still feels flat.
For Claude Code usersPeople with one answer that matters
- Before
- You ask again and again, and each retry comes at the problem from the same angle as the last.
- After
- Many sub-agents with different strategies attack and revise each other's answers, and one survivor comes back with the attacks it beat.
- Stars
- ★ 1.1k
- License
- MIT
- Cost
- Usage-based
- Level
- Intermediate
- Contents
- Includes scripts
Overview
Arena is a Claude Code skill by Jake Schincariol for when you are unhappy with an answer. It writes your task to a file and gives it word for word to 100 sub-agents (16 with --quick), each with a different reasoning strategy. They pair off to attack, defend and revise each other's work while a judge scores every match on a written rubric. You get the one solution left, the attacks it survived and, if you started from a rejected answer, a blind comparison with it.
Instead of asking again, it makes competing answers critique each other, and it tells you plainly if your original answer scored higher.
Try these first
Start with the first one: it is a small task you can check easily.
- /arena --quick write a headline for [your page]First try · 91 model calls
- /arena --agents 32 plan my launch week, I have [hours] a day187 model calls
- That's a bad answer. Make them compete.asks before running
- How big would a 100-agent arena be? Show the plan without starting it.read-only
Example prompts written by Agent Flows Hub.
What you get
From the creator's documentation.
| Output | What it is | Reads |
|---|---|---|
| Strategy cards | Each sub-agent gets its own mix of 15 reasoning modes, 12 workflows and 12 strategies | Your Claude plan |
| Attack and defend | Paired sub-agents attack each other's answers, then concede or rebut and revise | Your Claude plan |
| Judged bracket | A judge scores each match on a five-part rubric you can read and edit | Your Claude plan |
| Blind final check | Compares the winner with the answer you rejected, without knowing which is which | Your Claude plan |
| Winner report | The surviving answer, the attacks it survived, its card and the number of rounds | Your computer |
| Hands-off files | Works only inside an .arena folder; changes to your project come back for you to apply | Your computer |
Good to know
Get a better version of an answer you didn't like, such as a headline or a launch plan. The skill turns the request into a standalone task file, runs a bracket of sub-agents on it and returns the surviving answer with the attacks it beat.
Limits
- A full 100-agent run makes 595 sub-agent calls in waves of 10, so it takes a while and uses many tokens; --quick runs 16 agents and 91 calls.
- Every sub-agent writes a file in an .arena folder, so the default permission mode asks once per file. The README suggests accept-edits mode for the run.
Notes by Agent Flows Hub (original project name: arena), written from the creator's documentation, not from running it ourselves. arena SKILL.md · The Arena skill README
Stuck setting it up?
Tell us what happened. We take a look first; if it needs paid work, you get an estimate before anything starts.
More to get organised
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