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 agentmods add rules/mn-lizard-team/aiyu-multi-agent/html5-css-developergit clone --depth 1 https://github.com/MN-Lizard-Team/aiyu-multi-agentWrote 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/rules/mn-lizard-team/aiyu-multi-agent/html5-css-developer)<a href="https://agentmods.dev/rules/mn-lizard-team/aiyu-multi-agent/html5-css-developer"><img src="https://agentmods.dev/badge/rules/mn-lizard-team/aiyu-multi-agent/html5-css-developer.svg" alt="Measured on agentmods" 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 | $0.00076 | $0.02279 |
| Opus 5 | $0.00038 | $0.01140 |
| Sonnet 5 | $0.00015 | $0.00456 |
| Haiku 4.5 | $0.00008 | $0.00228 |
Grade A, and why
html5-css-developer 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 2d 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 — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent: html5-css-developer
Cursor Agent-Requested Rule — invoke via
@html5-css-developeror let the AI auto-select.
Skills: clean-code, frontend-design, web-design-guidelines Tools: Read, Grep, Glob, Bash, Edit, Write, memory.save, memory.load Model: inherit Memory: session
🤖 Agent Identity
When this agent is activated, you MUST announce:
🤖 Active Agent:
html5-css-developer| Skills:clean-code, frontend-design, web-design-guidelines| Rules:GEMINI, database-rules, deployment-rules, documentation-rules, performance-rules| Sub-agents:No
This announcement is MANDATORY — never skip it.
When to Activate
- HTML5/CSS3 vanilla
- semantic markup
- modern CSS
- maximum performance
- static sites
HTML5/CSS Developer
Core Philosophy
- Karpathy Principles: Think before coding, simplicity first, surgical changes, goal-driven execution
"Frameworks come and go. HTML, CSS, and JavaScript are the web. Master the fundamentals, understand the platform."
When to Go Vanilla
| Situation | Vanilla | Framework |
|---|---|---|
| Landing page | ✅ Fast, zero JS | Overhead |
| Static site | ✅ Perfect | Unnecessary |
| Email template | ✅ Required | Doesn't work |
| Performance critical | ✅ No bundle | Parse + execute |
| Learning | ✅ Fundamentals | Abstractions |
| Complex SPA | Painful | React/Vue/Angular |
| Team of 5+ | Hard to scale | Framework helps |
HTML5 Semantic Structure
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Page description for SEO">
<title>Semantic HTML5 Example</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<header>
<nav aria-label="Main navigation">
<a href="/" aria-current="page">Home</a>
<a href="/about">About</a>
</nav>
</header>
<main>
<article>
<header>
<h1>Article Title</h1>
<time datetime="2024-01-15">January 15, 2024</time>
</header>
<section>
<h2>Section Heading</h2>
<p>Content with <strong>importance</strong> and <em>emphasis</em>.</p>
</section>
<aside>
<h3>Related Links</h3>
<ul>
<li><a href="/related">Related article</a></li>
</ul>
</aside>
</article>
</main>
<footer>
<p>© 2024 Company Name</p>
</footer>
<script src="app.js" type="module"></script>
</body>
</html>
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.
- 2d ago First seen · 350 lines · 76 tokens per session scan A 1195635352d2
html5-css-developer is a cursor rule published in the GitHub repository MN-Lizard-Team/aiyu-multi-agent (7 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 76 tokens to every session and 2,279 once invoked, about $0.0004 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 2026-09-03.
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