How do I install the Unocss skill?

Run npx skillmds@latest add antfu/unocss in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Unocss skill do?

Configure and use UnoCSS, an instant atomic CSS engine with presets, rules, shortcuts, and integrations for Vite and Nuxt. It is listed under Web & Frontend, CSS & Styling, Frontend Frameworks on SkillMD.

Is Unocss safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Unocss?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Unocss free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Unocss?

Anthony Fu (@antfu) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Unocss by antfu — Agent Skill

Name: Unocss
Rating: 4.2 (5 reviews)
Author: Anthony Fu

File contents

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 66.x, generated at 2026-01-28.

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

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

---name: unocssdescription: Configure and use UnoCSS, an instant atomic CSS engine with presets, rules, shortcuts, and integrations for Vite and Nuxt.---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 66.x, generated at 2026-01-28.## Core| Topic | Description | Reference ||-------|-------------|-----------|| Configuration | Config file setup and all configuration options | [core-config](references/core-config.md) || Rules | Static and dynamic rules for generating CSS utilities | [core-rules](references/core-rules.md) || Shortcuts | Combine multiple rules into single shorthands | [core-shortcuts](references/core-shortcuts.md) || Theme | Theming system for colors, breakpoints, and design tokens | [core-theme](references/core-theme.md) || Variants | Apply variations like hover:, dark:, responsive to rules | [core-variants](references/core-variants.md) || Extracting | How UnoCSS extracts utilities from source code | [core-extracting](references/core-extracting.md) || Safelist & Blocklist | Force include or exclude specific utilities | [core-safelist](references/core-safelist.md) || Layers & Preflights | CSS layer ordering and raw CSS injection | [core-layers](references/core-layers.md) |## Presets### Main Presets| Topic | Description | Reference ||-------|-------------|-----------|| Preset Wind3 | Tailwind CSS v3 / Windi CSS compatible preset (most common) | [preset-wind3](references/preset-wind3.md) || Preset Wind4 | Tailwind CSS v4 compatible preset with modern CSS features | [preset-wind4](references/preset-wind4.md) || Preset Mini | Minimal preset with essential utilities for custom builds | [preset-mini](references/preset-mini.md) |### Feature Presets| Topic | Description | Reference ||-------|-------------|-----------|| Preset Icons | Pure CSS icons using Iconify with any icon set | [preset-icons](references/preset-icons.md) || Preset Attributify | Group utilities in HTML attributes instead of class | [preset-attributify](references/preset-attributify.md) || Preset Typography | Prose classes for typographic defaults | [preset-typography](references/preset-typography.md) || Preset Web Fonts | Easy Google Fonts and other web fonts integration | [preset-web-fonts](references/preset-web-fonts.md) || Preset Tagify | Use utilities as HTML tag names | [preset-tagify](references/preset-tagify.md) || Preset Rem to Px | Convert rem units to px for utilities | [preset-rem-to-px](references/preset-rem-to-px.md) |## Transformers| Topic | Description | Reference ||-------|-------------|-----------|| Variant Group | Shorthand for grouping utilities with common prefixes | [transformer-variant-group](references/transformer-variant-group.md) || Directives | CSS directives: @apply, @screen, theme(), icon() | [transformer-directives](references/transformer-directives.md) || Compile Class | Compile multiple classes into one hashed class | [transformer-compile-class](references/transformer-compile-class.md) || Attributify JSX | Support valueless attributify in JSX/TSX | [transformer-attributify-jsx](references/transformer-attributify-jsx.md) |## Integrations| Topic | Description | Reference ||-------|-------------|-----------|| Vite Integration | Setting up UnoCSS with Vite and framework-specific tips | [integrations-vite](references/integrations-vite.md) || Nuxt Integration | UnoCSS module for Nuxt applications | [integrations-nuxt](references/integrations-nuxt.md) |

Frequently asked questions

Unocss