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 Jignesh-Ponamwar/skills-mcp --skill web-artifacts-buildergit clone --depth 1 https://github.com/Jignesh-Ponamwar/skills-mcpWrote 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/jignesh-ponamwar/skills-mcp/web-artifacts-builder)<a href="https://agentmods.dev/skills/jignesh-ponamwar/skills-mcp/web-artifacts-builder"><img src="https://agentmods.dev/badge/skills/jignesh-ponamwar/skills-mcp/web-artifacts-builder/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/jignesh-ponamwar/skills-mcp/web-artifacts-builder"><img src="https://agentmods.dev/badge/skills/jignesh-ponamwar/skills-mcp/web-artifacts-builder.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 | $0.00103 | $0.02826 |
| Opus 5 | $0.00051 | $0.01413 |
| Sonnet 5 | $0.00021 | $0.00565 |
| Haiku 4.5 | $0.00010 | $0.00283 |
Grade A, and why
web-artifacts-builder 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 10d 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 — 332 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Artifacts Builder Skill
Two Approaches
| Approach | When to Use | Complexity |
|---|---|---|
| Pure HTML/CSS/JS | Simple interactions, no framework needed | Low |
| React + Tailwind (CDN) | Rich UI, components, state management | Medium |
| React + Vite + Bundle | Production app, many dependencies | High |
Approach A: Self-Contained HTML (No Build Step)
Best for: calculators, visualizations, simple tools, games.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Budget Calculator</title>
<style>
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: 'Inter', system-ui, sans-serif;
background: #0f172a;
color: #e2e8f0;
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
padding: 2rem;
}
.card {
background: #1e293b;
border: 1px solid #334155;
border-radius: 1rem;
padding: 2rem;
width: 100%;
max-width: 480px;
}
h1 {
font-size: 1.5rem;
font-weight: 700;
margin-bottom: 1.5rem;
color: #f8fafc;
}
.field {
margin-bottom: 1rem;
}
label {
display: block;
font-size: 0.875rem;
color: #94a3b8;
margin-bottom: 0.4rem;
}
input {
width: 100%;
padding: 0.6rem 0.8rem;
background: #0f172a;
border: 1px solid #475569;
border-radius: 0.5rem;
color: #f8fafc;
font-size: 1rem;
outline: none;
transition: border-color 0.2s;
}
input:focus { border-color: #6366f1; }
button {
width: 100%;
padding: 0.75rem;
background: #6366f1;
color: white;
border: none;
border-radius: 0.5rem;
font-size: 1rem;
font-weight: 600;
cursor: pointer;
margin-top: 1rem;
transition: background 0.2s;
}
button:hover { background: #4f46e5; }
.result {
margin-top: 1.5rem;
padding: 1rem;
background: #0f172a;
border-radius: 0.5rem;
border-left: 4px solid #6366f1;
display: none;
}
.result.show { display: block; }
.result-label { color: #94a3b8; font-size: 0.875rem; }
.result-value { color: #f8fafc; font-size: 1.5rem; font-weight: 700; }
</style>
</head>
<body>
<div class="card">
<h1>💰 Budget Calculator</h1>
<div class="field">
<label>Monthly Income ($)</label>
<input type="number" id="income" placeholder="5000">
</div>
<div class="field">
<label>Monthly Expenses ($)</label>
<input type="number" id="expenses" placeholder="3500">
</div>
<button onclick="calculate()">Calculate Savings</button>
<div class="result" id="result">
<div class="result-label">Monthly Savings</div>
<div class="result-value" id="savings-value"></div>
<div class="result-label" style="margin-top: 0.5rem" id="savings-pct"></div>
</div>
</div>
<script>
function calculate() {
const income = parseFloat(document.getElementById('income').value) || 0
const expenses = parseFloat(document.getElementById('expenses').value) || 0
const savings = income - expenses
const pct = income > 0 ? ((savings / income) * 100).toFixed(1) : 0
const result = document.getElementById('result')
document.getElementById('savings-value').textContent = `$${savings.toLocaleString()}`
document.getElementById('savings-pct').textContent = `${pct}% of income`
result.classList.add('show')
}
</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.
- 10d ago First seen · 332 lines · 103 tokens per session scan A f6a4bec7e177
web-artifacts-builder is a skill published in the GitHub repository Jignesh-Ponamwar/skills-mcp (7 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 103 tokens to every session and 2,826 once invoked, about $0.0005 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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