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How to change the rubric and strategy cards for your team with Arena Skill

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

Who it is forA team lead who wants judges to weigh criteria the way their work does, such as more weight on robustness or on specificity.

The problemThe default rubric and strategy cards suit general tasks but may not match how a team judges a good answer.

The outcomeA customised rubric.md and strategies.json that the arena uses in its next run.

What you need first

  • 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

Steps

  1. Clone the repo and open skills/arena/rubric.md
  2. Change the five criteria and their weights to match your team
  3. Edit skills/arena/strategies.json to add or remove reasoning modes, workflows and strategies
  4. Run python3 -m unittest discover -s tests -v to check the dealer and bracket still pass
  5. Run /arena --quick <task> in Claude Code and confirm the judges use your rubric (inferred, check the README)

Prompt for your agent

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.

Caveat. The README says the rubric and strategies are there to edit, but it does not say whether the tests check the weights, so verify the totals yourself.

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