Clerk

---
name: clerk
description: Clerk authentication router. Use when user asks about Clerk CLI operations,
  adding authentication, setting up Clerk, custom sign-in flows, Swift or native iOS
  auth, native Android auth, Next.js patterns, React patterns, Vue patterns, Nuxt
  patterns, Astro patterns, TanStack Start patterns, Expo patterns, React Router
  patterns, Chrome Extension patterns, organizations, billing, subscriptions, payments,
  pricing, plans, seat-based pricing, feature entitlements, syncing users, testing,
  impersonating a user, or testing webhooks locally.
  Automatically routes to the specific skill based on their task.
license: MIT
metadata:
  version: 2.0.0
---

# Clerk Skills Router

## Version Detection

Check `package.json` to determine the Clerk SDK version. This determines which patterns to use:

| Package | Core 2 (LTS until Jan 2027) | Current |
|---------|----------------------------|---------|
| `@clerk/nextjs` | v5–v6 | v7+ |
| `@clerk/react` or `@clerk/clerk-react` | v5–v6 | v7+ |
| `@clerk/expo` or `@clerk/clerk-expo` | v1–v2 | v3+ |
| `@clerk/react-router` | v1–v2 | v3+ |
| `@clerk/tanstack-react-start` | < v0.26.0 | v0.26.0+ |

**Default to current** if the version is unclear or the project is new. Core 2 packages use `@clerk/clerk-react` and `@clerk/clerk-expo` (with `clerk-` prefix); current packages use `@clerk/react` and `@clerk/expo`.

All skills are written for the current SDK. When something differs in Core 2, it's noted inline with `> **Core 2 ONLY (skip if current SDK):**` callouts. The exception is `clerk-custom-ui`, which has separate `core-2/` and `core-3/` directories for custom flow hooks since those APIs are entirely different between versions.

---

## By Task

**Adding Clerk to your project** → Use `clerk-setup`
- Framework detection and quickstart
- Environment setup, API keys, temporary dev keys via `clerk init`
- Migration from other auth providers

**Operating Clerk from the CLI** → Use `clerk-cli`
- Auth, linking, `doctor`, and environment pulls
- User, org, session, app, and instance management
- Impersonating a user (`clerk impersonate`) and local webhook testing (`clerk webhooks listen`)
- Feature toggles (`clerk enable orgs`, `clerk enable billing`)
- Backend, Platform, and Frontend API calls through `clerk api`
- Deploy handoff and deploy status verification

**Custom sign-in/sign-up UI** → Use `clerk-custom-ui`
- Custom authentication flows with `useSignIn` / `useSignUp` hooks
- Appearance and styling (themes, colors, layout)
- `<Show>` component for conditional rendering

**Advanced Next.js patterns** → Use `clerk-nextjs-patterns`
- Server vs Client auth APIs
- Middleware strategies
- Server Actions, caching
- API route protection

**React patterns** → Use `clerk-react-patterns`
- Hooks (`useAuth`, `useUser`, `useClerk`)
- Protected routes, auth guards
- Router integration

**React Router patterns** → Use `clerk-react-router-patterns`
- Loaders & actions with auth
- Route protection
- SSR auth

**Vue patterns** → Use `clerk-vue-patterns`
- Composables (`useAuth`, `useUser`, `useClerk`)
- Vue Router guards
- Pinia auth store integration

**Nuxt patterns** → Use `clerk-nuxt-patterns`
- Server middleware auth
- SSR auth with composables
- Server API routes

**Astro patterns** → Use `clerk-astro-patterns`
- SSR auth pages
- Island components with React
- Middleware & API routes

**TanStack Start patterns** → Use `clerk-tanstack-patterns`
- Server functions with auth
- Route protection via loaders
- Vinxi server integration

**Expo / React Native auth** → Use `clerk-expo`
- Prebuilt native components (AuthView, UserButton)
- Custom flows: email, password, SMS/phone OTP, MFA
- OAuth/SSO and native Google/Apple sign-in
- Expo Router protected routes, token storage, push notifications

**Chrome Extension patterns** → Use `clerk-chrome-extension-patterns`
- Background scripts auth
- Popup auth flows
- Content scripts with sync host

**B2B / Organizations** → Use `clerk-orgs`
- Multi-tenant apps
- Organization slugs in URLs
- Roles, permissions, RBAC
- Member management

**Billing & Subscriptions** → Use `clerk-billing`
- `<PricingTable />` component
- Plan and feature gating with `has()`
- Seat-based B2B billing with organizations
- Subscription lifecycle webhooks
- Free trials, invoicing

**Webhooks** → Use `clerk-webhooks`
- Real-time events
- Data syncing
- Notifications & integrations

**E2E Testing** → Use `clerk-testing`
- Playwright/Cypress setup
- Auth flow testing
- Test utilities

**Swift / native iOS auth** → Use `clerk-swift`
- Native iOS Swift and SwiftUI projects
- ClerkKit and ClerkKitUI implementation guidance
- Source-driven patterns from `clerk-ios`

**Android / native mobile auth** → Use `clerk-android`
- Native Android Kotlin and Jetpack Compose projects
- `clerk-android-api` and `clerk-android-ui` implementation guidance
- Source-driven patterns from `clerk-android`
- Do not use for Expo or React Native projects

**Backend REST API** → Use `clerk-backend-api`
- Browse API tags and endpoints
- Inspect endpoint schemas
- Execute API requests with scope enforcement

## Quick Navigation

If you know your task, you can directly access:
- `/clerk-setup` - Framework setup
- `/clerk-cli` - CLI operations and Clerk resource management
- `/clerk-custom-ui` - Custom flows & appearance
- `/clerk-nextjs-patterns` - Next.js patterns
- `/clerk-react-patterns` - React patterns
- `/clerk-react-router-patterns` - React Router patterns
- `/clerk-vue-patterns` - Vue patterns
- `/clerk-nuxt-patterns` - Nuxt patterns
- `/clerk-astro-patterns` - Astro patterns
- `/clerk-tanstack-patterns` - TanStack Start patterns
- `/clerk-expo` - Expo / React Native
- `/clerk-chrome-extension-patterns` - Chrome Extension patterns
- `/clerk-orgs` - Organizations
- `/clerk-billing` - Billing & subscriptions
- `/clerk-webhooks` - Webhooks
- `/clerk-testing` - Testing
- `/clerk-swift` - Swift/native iOS
- `/clerk-android` - Native Android
- `/clerk-backend-api` - Backend REST API

Or describe what you need and I'll recommend the right one.