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nuxt-better-auth/skill.md

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+---
+name: nuxt-better-auth
+description: Use when implementing auth in Nuxt apps with @onmax/nuxt-better-auth - provides useUserSession composable, server auth helpers, route protection, and Better Auth plugins integration.
+license: MIT
+---
+
+# Nuxt Better Auth
+
+Authentication module for Nuxt 4+ built on [Better Auth](https://www.better-auth.com/). Provides composables, server utilities, and route protection.
+
+> **Alpha Status**: This module is currently in alpha (v0.0.2-alpha.14) and not recommended for production use. APIs may change.
+
+## When to Use
+
+- Installing/configuring `@onmax/nuxt-better-auth`
+- Implementing login/signup/signout flows
+- Protecting routes (client and server)
+- Accessing user session in API routes
+- Integrating Better Auth plugins (admin, passkey, 2FA)
+- Setting up database with NuxtHub
+- Using clientOnly mode for external auth backends
+
+**For Nuxt patterns:** use `nuxt` skill
+**For NuxtHub database:** use `nuxthub` skill
+
+## Available Guidance
+
+| File                                                                 | Topics                                                                 |
+| -------------------------------------------------------------------- | ---------------------------------------------------------------------- |
+| **[references/installation.md](references/installation.md)**         | Module setup, env vars, config files                                   |
+| **[references/client-auth.md](references/client-auth.md)**           | useUserSession, signIn/signUp/signOut, BetterAuthState, safe redirects |
+| **[references/server-auth.md](references/server-auth.md)**           | serverAuth, getUserSession, requireUserSession                         |
+| **[references/route-protection.md](references/route-protection.md)** | routeRules, definePageMeta, middleware                                 |
+| **[references/plugins.md](references/plugins.md)**                   | Better Auth plugins (admin, passkey, 2FA)                              |
+| **[references/database.md](references/database.md)**                 | NuxtHub integration, Drizzle schema, custom tables with FKs            |
+| **[references/client-only.md](references/client-only.md)**           | External auth backend, clientOnly mode, CORS                           |
+| **[references/types.md](references/types.md)**                       | AuthUser, AuthSession, type augmentation                               |
+
+## Usage Pattern
+
+**Load based on context:**
+
+- Installing module? → [references/installation.md](references/installation.md)
+- Login/signup forms? → [references/client-auth.md](references/client-auth.md)
+- API route protection? → [references/server-auth.md](references/server-auth.md)
+- Route rules/page meta? → [references/route-protection.md](references/route-protection.md)
+- Using plugins? → [references/plugins.md](references/plugins.md)
+- Database setup? → [references/database.md](references/database.md)
+- External auth backend? → [references/client-only.md](references/client-only.md)
+- TypeScript types? → [references/types.md](references/types.md)
+
+**DO NOT read all files at once.** Load based on context.
+
+## Key Concepts
+
+| Concept                | Description                                                     |
+| ---------------------- | --------------------------------------------------------------- |
+| `useUserSession()`     | Client composable - user, session, loggedIn, signIn/Out methods |
+| `requireUserSession()` | Server helper - throws 401/403 if not authenticated             |
+| `auth` route mode      | `'user'`, `'guest'`, `{ user: {...} }`, or `false`              |
+| `serverAuth()`         | Get Better Auth instance in server routes                       |
+
+## Quick Reference
+
+```ts
+// Client: useUserSession()
+const { user, loggedIn, signIn, signOut } = useUserSession()
+await signIn.email({ email, password }, { onSuccess: () => navigateTo('/') })
+```
+
+```ts
+// Server: requireUserSession()
+const { user } = await requireUserSession(event, { user: { role: 'admin' } })
+```
+
+```ts
+// nuxt.config.ts: Route protection
+routeRules: {
+  '/admin/**': { auth: { user: { role: 'admin' } } },
+  '/login': { auth: 'guest' },
+  '/app/**': { auth: 'user' }
+}
+```
+
+## Resources
+
+- [Module Docs](https://github.com/onmax/nuxt-better-auth)
+- [Better Auth Docs](https://www.better-auth.com/)
+
+---
+
+_Token efficiency: Main skill ~300 tokens, each sub-file ~800-1200 tokens_