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 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/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/cosmicstack-labs/mercury-agent-skills/tailwind-css"><img src="https://agentmods.dev/badge/skills/cosmicstack-labs/mercury-agent-skills/tailwind-css.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 56 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 78 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 5.5 | $0.00008 | $0.00802 |
| Sonnet 5.5 | $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 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.
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.
- 1mo 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 (487 stars, last pushed 2mo ago), licensed MIT. It adds 20 tokens to every session and 2,006 once invoked, about $0.0001 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 2026-09-03.
Other skills, from other repositories
frontend-ui-engineering
Builds production-quality, accessible, responsive user-facing UIs. Use when building or modifying interfaces and pages, creating components, implementing layouts, meeting WCAG accessibility requirements, managing state, or when the output needs to look and feel production-quality rather than AI-generated.
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.
web-design-engineer
Build or redesign polished browser-rendered visual artifacts with HTML/CSS/JavaScript/React: pages, dashboards, prototypes, slide decks, animations, UI mockups, and data visualizations. Use for visual front-end creation, design-system exploration, design critique, or explicit browser acceptance / QA of a web artifact.…
design-artifact
Design principles and creative direction for building HTML artifacts — pages, reports, plans, landing pages, demos, decks, and small tools. Use when creating or restyling any visual HTML deliverable and deciding its palette, type pairing, layout, theming, or overall register, or when the output must not look…
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.