unocss
UnoCSS instant atomic CSS engine, superset of Tailwind CSS. Use when configuring UnoCSS, writing utility rules, shortcuts, or working with presets like Wind, Icons, Attributify.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/antfu/skills --skill unocss- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads unocss automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
UnoCSS is an instant atomic CSS engine designed to be flexible and extensible. The core is un-opinionated - all CSS utilities are provided via presets. It's a superset of Tailwind CSS, so you can reuse your Tailwind knowledge for basic syntax usage.
Important: Before writing UnoCSS code, agents should check for uno.config.* or unocss.config.* files in the project root to understand what presets, rules, and shortcuts are available. If the project setup is unclear, avoid using attributify mode and other advanced features - stick to basic class usage.
The skill is based on UnoCSS v66.10.5, generated at 2026-09-25.
Core
| Topic | Description | Reference |
|---|---|---|
| Configuration | Config file setup and all configuration options | core-config |
| Rules | Static and dynamic rules for generating CSS utilities | core-rules |
| Shortcuts | Combine multiple rules into single shorthands | core-shortcuts |
| Theme | Theming system for colors, breakpoints, and design tokens | core-theme |
| Variants | Apply variations like hover:, dark:, responsive to rules | core-variants |
| Extracting | How UnoCSS extracts utilities from source code | core-extracting |
| Safelist & Blocklist | Force include or exclude specific utilities | core-safelist |
| Layers & Preflights | CSS layer ordering and raw CSS injection | core-layers |
| Processors | Transform generated CSS layers (incl. Lightning CSS) | core-processors |
Presets
Main Presets
| Topic | Description | Reference |
|---|---|---|
| Preset Wind3 | Tailwind CSS v3 / Windi CSS compatible preset (most common) | preset-wind3 |
| Preset Wind4 | Tailwind CSS v4 compatible preset with modern CSS features | preset-wind4 |
| Preset Mini | Minimal preset with essential utilities for custom builds | preset-mini |
Feature Presets
| Topic | Description | Reference |
|---|---|---|
| Preset Icons | Pure CSS icons using Iconify with any icon set | preset-icons |
| Preset Attributify | Group utilities in HTML attributes instead of class | preset-attributify |
| Preset Typography | Prose classes for typographic defaults | preset-typography |
| Preset Web Fonts | Easy Google Fonts and other web fonts integration | preset-web-fonts |
| Preset Tagify | Use utilities as HTML tag names | preset-tagify |
| Preset Rem to Px | Convert rem units to px for utilities | preset-rem-to-px |
Transformers
| Topic | Description | Reference |
|---|---|---|
| Variant Group | Shorthand for grouping utilities with common prefixes | transformer-variant-group |
| Directives | CSS directives: @apply, @screen, theme(), icon() | transformer-directives |
| Compile Class | Compile multiple classes into one hashed class | transformer-compile-class |
| Attributify JSX | Support valueless attributify in JSX/TSX | transformer-attributify-jsx |
Integrations
| Topic | Description | Reference |
|---|---|---|
| Vite Integration | Setting up UnoCSS with Vite and framework-specific tips | integrations-vite |
| Nuxt Integration | UnoCSS module for Nuxt applications | integrations-nuxt |
FAQ
What does the unocss skill do?
UnoCSS instant atomic CSS engine, superset of Tailwind CSS. Use when configuring UnoCSS, writing utility rules, shortcuts, or working with presets like Wind, Icons, Attributify.
How do I install unocss?
Run npx skills add https://github.com/antfu/skills --skill unocss in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/unocss/ (personal) or .claude/skills/unocss/ (project).
Which AI agents can use unocss?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is unocss safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains unocss?
It is published by antfu in antfu/skills. It has 16,070 recorded installs.
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