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 skills/cosmicstack-labs/mercury-agent-skills/tailwind-cssnpx skills add cosmicstack-labs/mercury-agent-skills --skill tailwind-cssgit clone --depth 1 https://github.com/cosmicstack-labs/mercury-agent-skillsWrote 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/cosmicstack-labs/mercury-agent-skills/tailwind-css)<a href="https://agentmods.dev/skills/cosmicstack-labs/mercury-agent-skills/tailwind-css"><img src="https://agentmods.dev/badge/skills/cosmicstack-labs/mercury-agent-skills/tailwind-css.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 | $0.00020 | $0.02006 |
| Opus 5 | $0.00010 | $0.01003 |
| Sonnet 5 | $0.00004 | $0.00401 |
| Haiku 4.5 | $0.00002 | $0.00201 |
Grade A, and why
tailwind-css 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 — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tailwind CSS
Build beautiful, responsive interfaces efficiently with utility-first CSS.
Core Principles
1. Utility-First, Component-Last
Start with utilities, extract to components only when repetition demands it. Premature abstraction creates indirection without benefit.
2. Design in the Browser
Tailwind lets you iterate visually without context-switching to CSS files. Experiment, settle on a design, then clean up.
3. Consistency Through Constraints
Use the design system (colors, spacing, typography) via Tailwind's config. Custom values are escape hatches, not the default.
4. Responsive by Default
Design mobile-first. Add responsive prefixes (md:, lg:) to adjust for larger screens, not the other way around.
Tailwind Mastery Scorecard
| Skill | Beginner | Proficient | Expert |
|---|---|---|---|
| Utility usage | Writes long class strings | Groups with @apply or cn() |
Creates composable patterns |
| Config | Uses default theme | Extends theme with brand tokens | Creates plugins for custom utilities |
| Responsive | Copy-paste breakpoints | Mobile-first, strategic overrides | Container queries, dynamic breakpoints |
| Dark mode | Manual classes | dark: prefix consistently |
Automatic with class strategy |
| Performance | Not considered | PurgeCSS configured | JIT, optimized builds |
| Reusability | Rewrites same patterns | Uses @apply or component classes |
Headless + utility composition |
Target: Proficient for production projects.
Actionable Guidance
Class Organization
Recommended order (use Prettier plugin prettier-plugin-tailwindcss):
Layout → Flex/Grid → Spacing → Sizing → Typography → Visual → Interactive → States
<!-- Before (random order) -->
<div class="text-lg p-4 flex bg-white shadow-md rounded-lg mt-4 items-center">
<!-- After (organized) -->
<div class="flex items-center mt-4 p-4 rounded-lg bg-white shadow-md text-lg">
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 · 233 lines · 20 tokens per session scan A 875e3562bdc9
tailwind-css is a skill published in the GitHub repository cosmicstack-labs/mercury-agent-skills (471 stars, last pushed 11d ago), licensed MIT. It adds 20 tokens to every session and 2,006 once invoked, about $0.0001 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.
Other skills, from other repositories
playground
Creates interactive HTML playgrounds — self-contained single-file explorers that let users configure something visually through controls, see a live preview, and copy out a prompt. Use when the user asks to make a playground, explorer, or interactive tool for a topic.
frontend-design
Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults.
fixing-motion-performance
Audit and fix animation performance issues including layout thrashing, compositor properties, scroll-linked motion, and blur effects. Use when animations stutter, transitions jank, or reviewing CSS/JS animation performance.
baseline-ui
Quickly deslop UI code by fixing spacing, hierarchy, typography, and small layout issues. Use when the interface needs a fast cleanup or polish pass.
frontend-design
创建具有高设计品质、可交付生产的前端界面。当用户要求构建 Web 组件、页面、海报或应用（如官网、落地页、仪表盘、React/Vue 组件、HTML/CSS 布局，或对任意 Web UI 进行样式/美化）时使用本技能。产出有创意、打磨到位且避免「AI 通用审美」的代码与界面设计。.
antfu-design
Use this when building interfaces with UnoCSS in any framework (React, Vue, Svelte, Solid, or plain HTML), from dense devtools panels to landing pages. Read core-design-read first to set the direction, then apply the token system plus the polish and anti-slop rules.