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What you can do with Arena Skill

A free Claude Code skill that runs 100 sub-agents of the same model on one task, pairs their solutions in a judged bracket, and returns the single survivor.

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Jakeschincariol/arena-skill on GitHub

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What do you want to do?

4 use cases

  • Get a stronger answer after Claude keeps missing

    Run /arena on a task Claude keeps getting wrong and receive one attacked, judged survivor.

    View prompt
    Install the arena skill from https://github.com/Jakeschincariol/arena-skill by copying skills/arena into ~/.claude/skills/, then run /arena --quick on <task>. Expected output: one surviving solution, the attacks it survived, its card and the round count. Verify that every sub-agent wrote only inside .arena/ before you apply any change to the project.

  • Stress-test a fix for a flaky test

    Let 32 competitors attack and defend a proposed fix before you commit to it.

    View prompt
    Use the arena skill from https://github.com/Jakeschincariol/arena-skill to run /arena --agents 32 on the flaky test in <test file>. Expected output: the winning fix, the attacks it survived and the round count. Verify the result by running the project's own test suite before you apply the change.

  • Price a 100-agent run before you spend tokens

    Print the rounds, calls and waves for any agent count before the tournament starts.

    View prompt
    Using the repo at https://github.com/Jakeschincariol/arena-skill, run python3 skills/arena/bracket.py plan --agents <N> and report the rounds, sub-agent calls and waves. Expected output: the bracket table that the command prints. Verify that the command writes no files before you start a real run.

  • Change the rubric and strategy cards for your team

    Edit the five judging criteria and the strategy list, then run the arena with your rules.

    View prompt
    In the repo https://github.com/Jakeschincariol/arena-skill, edit skills/arena/rubric.md to reweight the five criteria as <your weights>, then run python3 -m unittest discover -s tests -v. Expected output: a passing test run. Verify that the weights in rubric.md still add up to the total the bracket expects before you run the arena.

How to use Arena Skill

  1. Check you have what it needs: Claude Code, because the skill spawns sub-agents with the Agent tool; Python 3.8 or newer; git, to clone the repo (or copy the folder by hand).
  2. Open Jakeschincariol/arena-skill on GitHub and read the README and license.
  3. Clone the repo with git clone https://github.com/Jakeschincariol/arena-skill.git
  4. Copy the skill with cp -r arena-skill/skills/arena ~/.claude/skills/
  5. In Claude Code, run /arena --quick <your task> using the task you want solved (inferred, check the README)
  6. Read the surviving solution and the attacks it survived before you use it

These steps come from our top use case, Get a stronger answer after Claude keeps missing, which also has a copy-paste agent prompt.

Arena Skill alternatives · Best AI repos for Software and DevOps

About this repo

Requirements

  • Claude Code, because the skill spawns sub-agents with the Agent tool
  • Python 3.8 or newer
  • git, to clone the repo (or copy the folder by hand)
  • Tokens to pay for the sub-agent calls, which the README says is the main cost
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Questions about Arena Skill

What is Arena Skill?

A free Claude Code skill that runs 100 sub-agents of the same model on one task, pairs their solutions in a judged bracket, and returns the single survivor. It is an open-source project on GitHub: https://github.com/Jakeschincariol/arena-skill.

Who is Arena Skill for?

Claude Code users who keep getting weak answers and want a stronger one, with a cost they can plan for before spending tokens.

What can I do with Arena Skill?

4 use cases so far, for example: Get a stronger answer after Claude keeps missing; Stress-test a fix for a flaky test; Price a 100-agent run before you spend tokens. Each has steps and a copy-paste agent prompt.

What do I need to run Arena Skill?

Claude Code, because the skill spawns sub-agents with the Agent tool; Python 3.8 or newer; git, to clone the repo (or copy the folder by hand); Tokens to pay for the sub-agent calls, which the README says is the main cost.

What are alternatives to Arena Skill?

Other hot AI repos in Software and DevOps: Harness2, iFixAi, Orca, Diagram Design, AI Memory.

Is Arena Skill safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.