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 brsbl/moss-skills --skill moss-htmlgit clone --depth 1 https://github.com/brsbl/moss-skillsWrote 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/brsbl/moss-skills/moss-html)<a href="https://agentmods.dev/skills/brsbl/moss-skills/moss-html"><img src="https://agentmods.dev/badge/skills/brsbl/moss-skills/moss-html.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00032 | $0.00864 |
| Opus 5 | $0.00016 | $0.00432 |
| Sonnet 5 | $0.00006 | $0.00173 |
| Haiku 4.5 | $0.00003 | $0.00086 |
Grade A, and why
moss-html 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 8d 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 — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Moss HTML
Use moss-html only for a genuine interactive design artifact or browser behavior that native Moss nodes cannot represent. Do not rebuild native tabs, tables, callouts, checklists, charts, comments, or review workflow. Keep requirements and review instructions in native Markdown.
Complete Shell
```moss-html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="moss-html-version" content="v1">
<style>
* { box-sizing: border-box; }
:root {
color-scheme: light;
--artifact-surface: rgb(253 250 246);
--artifact-ink: rgb(72 67 60);
--artifact-line: rgb(215 211 201);
--artifact-accent: rgb(57 112 77);
}
body {
width: 1200px;
min-height: 900px;
margin: 0;
background: var(--artifact-surface);
color: var(--artifact-ink);
font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.artifact { min-height: 900px; padding: 32px; }
</style>
</head>
<body>
<main class="artifact"><!-- interactive artifact --></main>
</body>
</html>
```
Use a plain moss-html fence line; dimensions belong in the document CSS, not the fence.
Runtime Contract
- The preview runs from an isolated data URL.
- Inline CSS and JavaScript are supported. Initialize behavior with
DOMContentLoaded. localStorage,sessionStorage, cookies, same-origin fetches, parent/window APIs, and Moss internals are unavailable or unreliable.- Note view shows a static screenshot before activating the live iframe. Make the initial state useful without JavaScript or network access.
- Set
widthandheightormin-height; otherwise Moss uses 1200x900. - Multiple jobs belong in separate focused fences.
- A visible button, tab, checkbox, filter, menu, or form control must work and use native semantics.
Images And Dependencies
Workspace-relative asset paths do not resolve inside the HTML data URL. For a small required image, embed a self-contained data URL such as src="data:image/png;base64,..."; keep payload size reasonable. Remote images, fonts, scripts, and fetches may fail and must not be required for the first frame or core interaction.
What ships with it
1 file 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.
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.
- 8d ago First seen · 89 lines · 32 tokens per session scan A 188745f6f6c6
moss-html is a skill published in the GitHub repository brsbl/moss-skills (11 stars, last pushed 14d ago), licensed MIT. It adds 32 tokens to every session and 864 once invoked, about $0.0002 per session on Opus 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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