Ultracite

A unified linting and formatting wrapper that supports Biome, ESLint, or Oxlint under one interface. Ships with 200+ preconfigured rules and framework-specific presets for React, Next.js, Vue, and Svelte, so you skip the setup bikeshedding. The Biome default is genuinely fast (Rust-based, 10-100x faster than ESLint), though you trade ecosystem maturity for speed. Version 7 added multi-provider support and an MCP server for AI editor integration. Best for new TypeScript projects or teams tired of maintaining ESLint configs. If you have deep ESLint plugin dependencies or need advanced CSS linting, the migration effort might not pay off. The interactive doctor command and preset migrations are thoughtful touches.

skills.sh installs: 426
GitHub stars: 248
last updated: Aug 21, 2026

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Install

$ npx -y skills add secondsky/claude-skills --skill ultracite --agent claude-code

Installs into .claude/skills of the current project.

Files

Ultracite Skill

Fast, zero-config linting and formatting for modern JavaScript/TypeScript projects

Overview

Ultracite is a unified linting and formatting solution that supports multiple providers: Biome (default, Rust-based), ESLint+Prettier+Stylelint, and Oxlint+Oxfmt. It provides framework-specific presets and zero-configuration defaults, replacing traditional ESLint+Prettier setups with a faster, simpler alternative. Ultracite operates invisibly in the background, automatically formatting code and applying fixes on every save.

Version 7 Changes: Multi-provider architecture, preset path migration, MCP server support, AI hooks Version 6 Changes: Framework-specific presets introduced (React, Next.js, Vue, Svelte, etc.)