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.
git clone --depth 1 https://github.com/0xfurai/claude-code-subagentsWrote 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/0xfurai/claude-code-subagents/css-expert)<a href="https://agentmods.dev/agents/0xfurai/claude-code-subagents/css-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/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/0xfurai/claude-code-subagents/css-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/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 | $0.00051 | $0.00445 |
| Opus 5.5 | $0.00020 | $0.00178 |
| Sonnet 5.5 | $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 1mo 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.
- 1mo 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 (1,017 stars, last pushed 1y ago), licensed MIT. It adds 51 tokens to every session and 445 once invoked, about $0.0002 per session on Opus 5.5. 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.
Other agents, from other repositories
vibe-change-worker
The one persistent implementation writer for a vibe session. Keeps the same context, worktree and branch while planning, implementing all frontend/backend/prototype/component work, fixing reviewed issues, repairing existing tests its change broke and listing the missing tests for engineering at handoff; it writes…
ui-developer
Use this agent when you need to implement or fix UI components based on design references or designer feedback. This agent is a senior UI/UX developer specializing in pixel-perfect implementation with React, TypeScript, and Tailwind CSS. Trigger this agent in these scenarios:\n\n \nContext: Designer has reviewed…
ui-color-reviewer
Color-system review — OKLCH usage, tinted neutrals, contrast, palette construction, theme selection (dark/light), status colors, accessibility. Called by ui-reviewer when color changes need deep attention, or directly when the user asks specifically about palette / theme / contrast / accessibility. Dispatch when: a…
html-build
Build agent — generates lecturevN.html from slidedeck.md and designspec.md, integrates images. Use when: designspec.md is locked (Gate 3 approved) and HTML slide file needs to be produced.
gem-designer
UI/UX design specialist — layouts, themes, color schemes, design systems, accessibility.
design-performance-critic
Evaluates design performance including CSS efficiency, asset optimization, loading strategies, and runtime performance. Use this agent to ensure generated designs are fast and efficient. Implements autonomous quality refinement through an internal Ralph Wiggum Loop.