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Security · Backend / AGENT SKILL
clerk-auth
0
Implement Clerk authentication, middleware, organizations, webhooks, user synchronization, and sign-in flows.
Expert patterns for Clerk auth implementation, middleware, organizations, webhooks, and user sync Use when: adding authentication, clerk auth, user authentication, sign in, sign up.
Understand the trade-offs.
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The full skill.
Original instructions from the publisher’s SKILL.md
# Clerk Authentication ## Patterns ### Next.js App Router Setup Complete Clerk setup for Next.js 14/15 App Router. Includes ClerkProvider, environment variables, and basic sign-in/sign-up components. Key components: - ClerkProvider: Wraps app for auth context - <SignIn />, <SignUp />: Pre-built auth forms - <UserButton />: User menu with session management ### Middleware Route Protection Protect routes using clerkMiddleware and createRouteMatcher. Best practices: - Single middleware.ts file at project root - Use createRouteMatcher for route groups - auth.protect() for explicit protection - Centralize all auth logic in middleware ### Server Component Authentication Access auth state in Server Components using auth() and currentUser(). Key functions: - auth(): Returns userId, sessionId, orgId, claims - currentUser(): Returns full User object - Both require clerkMiddleware to be configured ## ⚠️ Sharp Edges | Issue | Severity | Solution | |-------|----------|----------| | Issue | critical | See docs | | Issue | high | See docs | | Issue | high | See docs | | Issue | high | See docs | | Issue | medium | See docs | | Issue | medium | See docs | | Issue | medium | See docs | | Issue | medium | See docs |