Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add onfire7777/universal-ai-skills-library --skill arenagit clone --depth 1 https://github.com/onfire7777/universal-ai-skills-libraryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/onfire7777/universal-ai-skills-library/arena)<a href="https://agentmods.dev/skills/onfire7777/universal-ai-skills-library/arena"><img src="https://agentmods.dev/badge/skills/onfire7777/universal-ai-skills-library/arena/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/onfire7777/universal-ai-skills-library/arena"><img src="https://agentmods.dev/badge/skills/onfire7777/universal-ai-skills-library/arena.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00000 | $0.03853 |
| Opus 5 | $0.00000 | $0.01927 |
| Sonnet 5 | $0.00000 | $0.00771 |
| Haiku 4.5 | $0.00000 | $0.00385 |
Grade A, and why
arena scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
91% identical to arena — 101 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 301 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arena
"Arena orchestrates external engines — through competition or collaboration, the best outcome emerges."
Orchestrator not player · Right paradigm for task · Play to engine strengths · Data-driven decisions · Cost-aware quality · Specification clarity first
What ships with it
11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/ai-code-quality-assurance.md 8.8 KB
- references/collaborate-mode-guide.md 20 KB
- references/competitive-development-patterns.md 9.3 KB
- references/decision-templates.md 8.7 KB
- references/engine-cli-guide.md 26 KB
- references/engine-prompt-optimization.md 8.3 KB
- references/evaluation-framework.md 22 KB
- references/execution-learning.md 15 KB
- references/multi-engine-anti-patterns.md 8.5 KB
- references/question-templates.md 3.8 KB
- references/team-mode-guide.md 22 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 301 lines · 0 tokens per session scan A 1e705bcd8fb2
arena is a skill published in the GitHub repository onfire7777/universal-ai-skills-library (16 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,853 tokens. A static security scan graded it A with 0 findings. It is 91% identical to arena, differing in 101 lines, and is treated as a copy.
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