caldav-mcp: Skill for Claude Code

Ultracite

Zero-config linting and formatting for JS/TS projects. Supports three linter backends: Oxlint + Oxfmt (recommended), Biome, and ESLint + Prettier + Stylelint.

Detecting Ultracite

Check if ultracite is in package.json dependencies or devDependencies. Detect the active linter by looking for (searching upward from the current directory):

• biome.json / biome.jsonc → Biome
• eslint.config.* (.mjs, .js, .cjs, .ts, .mts, .cts) → ESLint (with Prettier for formatting)
• oxlint.config.ts, oxlint.config.mts or .oxlintrc.json → Oxlint (with oxfmt.config.ts or oxfmt.config.mts for formatting; init writes the .mts form in a package that isn't an ES module)

CLI Commands

# Check for issues (read-only)
bunx ultracite check

# Auto-fix issues
bunx ultracite fix

# Diagnose setup problems
bunx ultracite doctor

# Initialize in a new project
bunx ultracite init

Replace bunx with npx, pnpm exec, or yarn depending on the package manager, so the project's installed Ultracite runs (pnpm dlx and yarn dlx download the latest release instead, and Yarn 1 has no dlx). Only init in a project without Ultracite needs a download runner such as pnpm dlx.

check and fix accept optional file paths: bunx ultracite check src/index.ts. Unknown options are passed through to the underlying linter (e.g. bunx ultracite check --max-warnings 0).

Initialization

bunx ultracite init runs an interactive setup. For non-interactive (CI) use, pass flags:

bunx ultracite init \
  --pm bun \
  --linter biome \
  --editors universal \
  --agents claude copilot \
  --frameworks react next \
  --integrations husky lint-staged \
  --yes

Flags:

• --pm — npm | yarn | pnpm | bun | deno | nub | aube
• --linter — oxlint (recommended) | biome | eslint
• --editors — universal (writes .vscode/settings.json for every VS Code-based editor) | vscode | cursor | devin | codebuddy | antigravity | bob | kiro | trae | void | zed
• --agents — every choice writes the rules to AGENTS.md. universal writes only that; claude, gemini, aider and replit also add the import, settings or copy that agent needs to read them; IDs like codex, copilot, cline, amp and cursor-cli (40 agents supported) need nothing more
• --frameworks — react | next | solid | vue | svelte | qwik | remix | tanstack | angular | astro | nestjs | jest | vitest | cypress | storybook
• --integrations — husky | lefthook | lint-staged | pre-commit
• --hooks — Enable auto-fix hooks: claude | codex | copilot | cursor | devin | codebuddy | deepagents | grok
• --js-plugins — Opt-in Oxlint JS plugins: @shadcn/lint | anti-slop | eslint-plugin-github | eslint-plugin-jsdoc | eslint-plugin-sonarjs | eslint-plugin-tsdoc | oxlint-plugin-react-doctor
• --type-aware — Enable type-aware linting (ESLint and Biome: extend their type-aware preset; Oxlint: installs oxlint-tsgolint and sets typeAware), and turn on strictNullChecks in tsconfig files
• --install-skill — Install the reusable Ultracite skill after setup
• --skip-install — Skip dependency installation
• --yes, -y — Take the defaults without prompting (automatic when CI=true or there's no terminal); defaults to oxlint when --linter is omitted
• --quiet — Only print warnings and errors