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 dravensoft-dev/arena --skill designgit clone --depth 1 https://github.com/dravensoft-dev/arenaWrote 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/dravensoft-dev/arena/design)<a href="https://agentmods.dev/skills/dravensoft-dev/arena/design"><img src="https://agentmods.dev/badge/skills/dravensoft-dev/arena/design/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/dravensoft-dev/arena/design"><img src="https://agentmods.dev/badge/skills/dravensoft-dev/arena/design.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 | $0.00110 | $0.05084 |
| Opus 5.5 | $0.00044 | $0.02034 |
| Sonnet 5.5 | $0.00022 | $0.01017 |
| Haiku 4.5 | $0.00011 | $0.00508 |
Grade A, and why
design 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arena
Arena is Dravensoft's design language: a token layer, React and Angular component libraries built on that layer, and a shared Tailwind layer. Arena's identity is warm black under bone text, with crimson as the voice and gold as distinction.
Arena is a product-application library. Arena ships tables, forms, navigation, dialogs,
charts, cards and the states around them, which is the furniture of an application somebody works
in. A
media or a consumer product is a different register. A photo wall, a feed of posts, a document
editor or a game map is markup you write yourself. The skin travels either way, because a style
plugin's answers hold whatever the product is. When that is your product, or one screen of
it, read references/media-register.md. That page is what Arena
hands you instead of a component: the pattern your markup binds, the parts the package already
ships for it, and the one rule that bends.
This file routes. Read only what your task needs. The rules below bind the code you write. The table under them routes. Read the rules once per project rather than once per screen.
Which job is this?
Building something with Arena, meaning a screen, a prototype, a skin or an integration: stay
here and follow the table below. On a project you have not walked yet, start at
references/cold-start.md instead. That page's first question is
whether the project already carries Arena. A project that does gets a short walk, which reads the config
and the style plugin already there. A project that does not gets the only page that asks what this
product looks like before anything answers.
Changing Arena itself, meaning adding a component, moving a token, or editing a contract or a
gate: read AGENTS.md instead.
That file is the root of the other branch and this file is not. The path is relative to a clone.
A published copy of this file points that link at the repository, because that branch belongs
to the repository and reaches nothing a package or this site carries.
What ships with it
29 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/artifact.md 5.7 KB
- references/bundlers/angular.md 3.6 KB
- references/bundlers/bun-esbuild.md 7.0 KB
- references/bundlers/index.md 7.1 KB
- references/bundlers/next.md 4.1 KB
- references/bundlers/parcel.md 4.9 KB
- references/bundlers/rollup.md 11 KB
- references/bundlers/webpack.md 8.4 KB
- references/cli.md 23 KB
- references/cold-start.md 21 KB
- references/config.md 13 KB
- references/contracts.md 8.1 KB
- references/environments.md 13 KB
- references/exports.md 53 KB
- references/install.md 14 KB
- references/locale.md 17 KB
- references/mcp.md 7.7 KB
- references/media-register.md 12 KB
- references/page.md 11 KB
- references/seo.md 10 KB
- references/shell.md 10 KB
- references/stack.md 13 KB
- references/style-kernel.md 20 KB
- references/style.md 14 KB
- references/stylesheets.md 11 KB
- references/surface.md 11 KB
- references/theme.md 20 KB
- references/tokens.md 9.2 KB
- references/versioning.md 4.0 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.
- 4d ago Changed · +12 lines b47c19126eff
- 20d ago Changed · +5 lines 3c9d3ba03d9e
- 1mo ago Changed 1c9cd2d356f6
- 1mo ago Changed · +17 lines b84616dc9a03
- 1mo ago Changed e9425f058c3b
- 1mo ago First seen · 200 lines · 110 tokens per session scan A 245b9da3f6bb
design is a skill published in the GitHub repository dravensoft-dev/arena (2 stars, last pushed 4d ago), licensed MIT. It adds 110 tokens to every session and 5,084 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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