Arena
Make 100 versions of Claude fight to the death over one task.
Install
npx skills add Jakeschincariol/arena-skill --skill arena -g -a claude-code -y- Repository
- Jakeschincariol/arena-skill1.2k
- Category
- AI and agents
- Updated
- 1mo ago
- License
- MIT
- Context cost
- Mediumabout 3,000 tokens
- Runs scripts
- Yes, review before use
What it does
Make 100 versions of Claude fight to the death over one task. Spins up N sub-agents (default 100, --quick for 16), gives every one the exact same task plus a different strategy card (reasoning mode, workflow, strategy), then runs a single-elimination bracket: they attack each other's solutions, defend and revise, and a judge scores every match on a written rubric until one solution survives. Use when the user is not satisfied with an answer, calls it a bad answer, says try again or do better, says "arena", or asks to make them compete.
arena
For when Claude keeps giving a bad answer. Instead of asking again and again, this runs a tournament: N sub-agents get the exact same task, each attacks it with a different reasoning mode, workflow and strategy, and then they attack each other in a bracket until one solution is left. You are the orchestrator. You never compete and you never judge.
What the user typed after /arena: $ARGUMENTS
If that is blank, or still reads like a placeholder, nothing was passed: take the task from the conversation.
The tool
Every piece of bookkeeping goes through bracket.py in this skill's folder:
python3 "${CLAUDE_SKILL_DIR}/bracket.py" <command>
Below, ARENA means exactly that command. If the path looks unexpanded, use the "Base directory for
this skill" that Claude Code printed at the top of this skill. The state lives in
.arena/<run>/arena.json in the current directory, and every command after init finds it through
.arena/LATEST.
Step 1: size it, and get a yes if nobody asked for it
Read the flags out of the request. Everything that is not a flag is the task.
| flag | meaning |
|---|---|
--agents N | N competitors. Default 100. |
--quick | 16 competitors. The everyday setting. |
--seed S | Fixes the cards and the pairings. Default: random, and recorded. |
--wave W | Sub-agents per wave. Default 10. Only raise it if the user raised Claude Code's limit. |
No task text at all means: the task is the user's most recent request in this conversation, and your last answer to it is the baseline to beat.
Run ARENA plan --agents N (or --quick). It prints the rounds, the sub-agent calls and the waves.
