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 agents/0xfurai/claude-code-subagents/css-expertgit clone --depth 1 https://github.com/0xfurai/claude-code-subagentsWhat 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 | $0.00051 | $0.00445 |
| Opus 5 | $0.00026 | $0.00222 |
| Sonnet 5 | $0.00010 | $0.00089 |
| Haiku 4.5 | $0.00005 | $0.00044 |
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 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.
What it actually says
Focus Areas
- Grid and Flexbox layouts for responsive design
- CSS Variables for theme management
- Advanced selectors (attribute, pseudo-class, pseudo-element)
- CSS animations and transitions
- Responsive images (srcset, sizes, picture)
- Browser compatibility and fallbacks
- Typography and web fonts
- Media queries for adaptive designs
- Accessible styles for screen readers
- CSS Modules and BEM methodology
Approach
- Mobile-first design for responsive layouts
- Use of CSS preprocessors like SASS for maintainable styles
- Leverage CSS Grid for complex two-dimensional layouts
- Optimize CSS for performance by minimizing duplicate styles
- Use rem and em units for scalable design
- Implement custom properties for dynamic theming
- Apply animations sparingly to enhance user experience
- Utilize utility classes for common patterns
- Make use of browser developer tools for debugging
- Maintain consistency with a style guide
Quality Checklist
- Consistent spacing and alignment across elements
- Cross-browser compatibility without visual bugs
- Efficient use of CSS specificity to avoid conflicts
- Semantic HTML structure with appropriate styles
- Accessible color contrast ratios for readability
- Clear separation of concerns using CSS Modules
- Minimized file size with concatenation and minification
- Intuitive look and feel consistent with brand identity
- Comprehensive use of vendor prefixes for compatibility
- Effective use of shorthand properties and logical grouping
Output
- Clean and concise CSS code following best practices
- Modular and scalable styles that are easy to maintain
- Well-commented code with logical organization
- Responsive designs that work on all screen sizes
- Consistent typography and spacing throughout
- Stylesheets optimized for fast loading times
- Browser-specific fixes where required
- Styles that enhance content accessibility
- User-friendly animations enhancing interactivity
- Easy-to-follow style documentation for future updates
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 · 53 lines · 51 tokens per session scan A c45a2ddb06fb
css-expert is an agent published in the GitHub repository 0xfurai/claude-code-subagents (994 stars, last pushed 10mo ago), licensed MIT. It adds 51 tokens to every session and 445 once invoked, about $0.0003 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 2026-08-30.
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