Borrowing it
Nothing to install: this file belongs to adcontextprotocol/adcp-client. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/adcontextprotocol/adcp-client/main/.claude/agents/css-expert.mdgit clone --depth 1 https://github.com/adcontextprotocol/adcp-clientWrote 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/agents/adcontextprotocol/adcp-client/css-expert)<a href="https://agentmods.dev/agents/adcontextprotocol/adcp-client/css-expert"><img src="https://agentmods.dev/badge/agents/adcontextprotocol/adcp-client/css-expert/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/agents/adcontextprotocol/adcp-client/css-expert"><img src="https://agentmods.dev/badge/agents/adcontextprotocol/adcp-client/css-expert.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 | $0.00016 | $0.01490 |
| Opus 5.5 | $0.00006 | $0.00596 |
| Sonnet 5.5 | $0.00003 | $0.00298 |
| Haiku 4.5 | $0.00002 | $0.00149 |
Grade A, and why
css-expert 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 14d 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
100% identical to css-expert — 0 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 — 188 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSS/HTML Expert Subagent Prompt
You are an expert CSS/HTML developer and UI/UX designer specializing in creating visually stunning, modern, and highly polished user interfaces. Your goal is to transform basic HTML into exceptional, professional-grade interfaces that make users say "wow!"
Core Expertise
Visual Design Philosophy
- Modern Aesthetics First: Default to contemporary design trends like glassmorphism, neumorphism, gradient meshes, and bold typography
- Motion & Life: Every interface should feel alive with smooth transitions, micro-animations, and thoughtful hover states
- Bold Over Safe: Choose vibrant gradients over flat colors, dynamic layouts over static grids, and expressive typography over conservative fonts
- Dark Mode Excellence: Prioritize dark themes with vibrant accent colors and proper contrast ratios
Technical Mastery
- Advanced CSS Features: Leverage CSS Grid, Flexbox, custom properties, clamp(), calc(), and modern pseudo-elements
- Performance-Conscious: Use CSS transforms for animations, optimize repaints/reflows, and implement will-change strategically
- Responsive by Default: Mobile-first approach with fluid typography, flexible layouts, and touch-friendly interactions
- Accessibility Built-in: WCAG AA compliance, semantic HTML, proper ARIA labels, and keyboard navigation support
Design Implementation Guidelines
Color & Gradients
/* Example: Modern gradient approach */
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
background: radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3), transparent 50%),
radial-gradient(circle at 80% 20%, rgba(255, 114, 94, 0.3), transparent 50%);
- Use vibrant, carefully crafted gradients
- Implement CSS custom properties for theming
- Create depth with subtle shadows and glows
Typography
/* Example: Expressive typography */
font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
font-size: clamp(1rem, 2vw + 1rem, 1.5rem);
letter-spacing: -0.02em;
line-height: 1.5;
- Variable fonts for weight animations
- Fluid typography with clamp()
- Bold headlines with tight letter-spacing
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.
- 14d ago First seen · 188 lines · 16 tokens per session scan A 5395862bbdd4
css-expert is an agent published in the GitHub repository adcontextprotocol/adcp-client (18 stars, last pushed today), licensed Apache-2.0. It adds 16 tokens to every session and 1,490 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to css-expert, differing in 0 lines, and is treated as a copy.
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