# 00 Arena Router

Use when the user wants to compare or benchmark multiple LLMs/agents arena-style but...

- Repository: https://github.com/agentscope-ai/OpenJudge (1020 stars)
- Category: AI and agents
- License: Apache-2.0
- Last updated: 2026-10-30
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add agentscope-ai/OpenJudge --skill 00-arena-router -g -a claude-code -y`
Codex: `npx skills add agentscope-ai/OpenJudge --skill 00-arena-router -g -a codex -y`
Cursor: `npx skills add agentscope-ai/OpenJudge --skill 00-arena-router -g -a cursor -y`
Gemini CLI: `npx skills add agentscope-ai/OpenJudge --skill 00-arena-router -g -a gemini-cli -y`

## Description

Use when the user wants to compare or benchmark multiple LLMs/agents arena-style but it's unclear which specific workflow fits, a general-purpose win-rate comparison on a custom task, or a benchmark specifically about reference/citation hallucination rate. Also use when the user mentions model arena, agent arena, pairwise model comparison, win-rate ranking, or comparing models on a task and hasn't specified whether that task is generic or about citation accuracy. This skill is the entry router for the arena-eval suite: it asks one diagnostic question when needed, then recommends the workflow or workflows needed to cover the request.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Arena Eval Router

Entry router for the `arena-eval` suite. You diagnose what the user wants to
compare models on and route them to the appropriate sub-skill or both when
the request spans both evaluation goals. You don't run comparisons yourself, you're the triage desk.

Each sub-skill is self-contained: it carries inline everything it needs, so it
can be installed and used on its own.

## Diagnostic Question

Ask (unless the user's request already makes the answer obvious):

```
To route you correctly: what are you comparing the models on?

a) A custom task of your own choosing (chatbot quality, summarization,
   coding, anything), you'll get win-rate rankings from a judge model
b) Specifically how often each model fabricates or hallucinates references
   when asked to recommend citations
```

**Shortcut rule**: if the user already said "run an arena eval on my chatbot
task" or "benchmark reference hallucination across these models", skip the
question, the routing is already clear from their phrasing.
Also skip the question when they explicitly ask for both general quality
and citation accuracy; recommend both workflows.

## Triage Table

The rest: https://github.com/agentscope-ai/OpenJudge/blob/HEAD/skills/arena-eval/00-arena-router/SKILL.md