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+---
+name: better-auth
+description: Implement authentication and authorization with Better Auth - a framework-agnostic TypeScript authentication framework. Features include email/password authentication with verification, OAuth providers (Google, GitHub, Discord, etc.), two-factor authentication (TOTP, SMS), passkeys/WebAuthn support, session management, role-based access control (RBAC), rate limiting, and database adapters. Use when adding authentication to applications, implementing OAuth flows, setting up 2FA/MFA, managing user sessions, configuring authorization rules, or building secure authentication systems for web applications.
+license: MIT
+version: 2.0.0
+---
+
+# Better Auth Skill
+
+Better Auth is comprehensive, framework-agnostic authentication/authorization framework for TypeScript with built-in email/password, social OAuth, and powerful plugin ecosystem for advanced features.
+
+## When to Use
+
+- Implementing auth in TypeScript/JavaScript applications
+- Adding email/password or social OAuth authentication
+- Setting up 2FA, passkeys, magic links, advanced auth features
+- Building multi-tenant apps with organization support
+- Managing sessions and user lifecycle
+- Working with any framework (Next.js, Nuxt, SvelteKit, Remix, Astro, Hono, Express, etc.)
+
+## Quick Start
+
+### Installation
+
+```bash
+npm install better-auth
+# or pnpm/yarn/bun add better-auth
+```
+
+### Environment Setup
+
+Create `.env`:
+```env
+BETTER_AUTH_SECRET=<generated-secret-32-chars-min>
+BETTER_AUTH_URL=http://localhost:3000
+```
+
+### Basic Server Setup
+
+Create `auth.ts` (root, lib/, utils/, or under src/app/server/):
+
+```ts
+import { betterAuth } from "better-auth";
+
+export const auth = betterAuth({
+  database: {
+    // See references/database-integration.md
+  },
+  emailAndPassword: {
+    enabled: true,
+    autoSignIn: true
+  },
+  socialProviders: {
+    github: {
+      clientId: process.env.GITHUB_CLIENT_ID!,
+      clientSecret: process.env.GITHUB_CLIENT_SECRET!,
+    }
+  }
+});
+```
+
+### Database Schema
+
+```bash
+npx @better-auth/cli generate  # Generate schema/migrations
+npx @better-auth/cli migrate   # Apply migrations (Kysely only)
+```
+
+### Mount API Handler
+
+**Next.js App Router:**
+```ts
+// app/api/auth/[...all]/route.ts
+import { auth } from "@/lib/auth";
+import { toNextJsHandler } from "better-auth/next-js";
+
+export const { POST, GET } = toNextJsHandler(auth);
+```
+
+**Other frameworks:** See references/email-password-auth.md#framework-setup
+
+### Client Setup
+
+Create `auth-client.ts`:
+
+```ts
+import { createAuthClient } from "better-auth/client";
+
+export const authClient = createAuthClient({
+  baseURL: process.env.NEXT_PUBLIC_BETTER_AUTH_URL || "http://localhost:3000"
+});
+```
+
+### Basic Usage
+
+```ts
+// Sign up
+await authClient.signUp.email({
+  email: "user@example.com",
+  password: "secure123",
+  name: "John Doe"
+});
+
+// Sign in
+await authClient.signIn.email({
+  email: "user@example.com",
+  password: "secure123"
+});
+
+// OAuth
+await authClient.signIn.social({ provider: "github" });
+
+// Session
+const { data: session } = authClient.useSession(); // React/Vue/Svelte
+const { data: session } = await authClient.getSession(); // Vanilla JS
+```
+
+## Feature Selection Matrix
+
+| Feature | Plugin Required | Use Case | Reference |
+|---------|----------------|----------|-----------|
+| Email/Password | No (built-in) | Basic auth | [email-password-auth.md](./references/email-password-auth.md) |
+| OAuth (GitHub, Google, etc.) | No (built-in) | Social login | [oauth-providers.md](./references/oauth-providers.md) |
+| Email Verification | No (built-in) | Verify email addresses | [email-password-auth.md](./references/email-password-auth.md#email-verification) |
+| Password Reset | No (built-in) | Forgot password flow | [email-password-auth.md](./references/email-password-auth.md#password-reset) |
+| Two-Factor Auth (2FA/TOTP) | Yes (`twoFactor`) | Enhanced security | [advanced-features.md](./references/advanced-features.md#two-factor-authentication) |
+| Passkeys/WebAuthn | Yes (`passkey`) | Passwordless auth | [advanced-features.md](./references/advanced-features.md#passkeys-webauthn) |
+| Magic Link | Yes (`magicLink`) | Email-based login | [advanced-features.md](./references/advanced-features.md#magic-link) |
+| Username Auth | Yes (`username`) | Username login | [email-password-auth.md](./references/email-password-auth.md#username-authentication) |
+| Organizations/Multi-tenant | Yes (`organization`) | Team/org features | [advanced-features.md](./references/advanced-features.md#organizations) |
+| Rate Limiting | No (built-in) | Prevent abuse | [advanced-features.md](./references/advanced-features.md#rate-limiting) |
+| Session Management | No (built-in) | User sessions | [advanced-features.md](./references/advanced-features.md#session-management) |
+
+## Auth Method Selection Guide
+
+**Choose Email/Password when:**
+- Building standard web app with traditional auth
+- Need full control over user credentials
+- Targeting users who prefer email-based accounts
+
+**Choose OAuth when:**
+- Want quick signup with minimal friction
+- Users already have social accounts
+- Need access to social profile data
+
+**Choose Passkeys when:**
+- Want passwordless experience
+- Targeting modern browsers/devices
+- Security is top priority
+
+**Choose Magic Link when:**
+- Want passwordless without WebAuthn complexity
+- Targeting email-first users
+- Need temporary access links
+
+**Combine Multiple Methods when:**
+- Want flexibility for different user preferences
+- Building enterprise apps with various auth requirements
+- Need progressive enhancement (start simple, add more options)
+
+## Core Architecture
+
+Better Auth uses client-server architecture:
+1. **Server** (`better-auth`): Handles auth logic, database ops, API routes
+2. **Client** (`better-auth/client`): Provides hooks/methods for frontend
+3. **Plugins**: Extend both server/client functionality
+
+## Implementation Checklist
+
+- [ ] Install `better-auth` package
+- [ ] Set environment variables (SECRET, URL)
+- [ ] Create auth server instance with database config
+- [ ] Run schema migration (`npx @better-auth/cli generate`)
+- [ ] Mount API handler in framework
+- [ ] Create client instance
+- [ ] Implement sign-up/sign-in UI
+- [ ] Add session management to components
+- [ ] Set up protected routes/middleware
+- [ ] Add plugins as needed (regenerate schema after)
+- [ ] Test complete auth flow
+- [ ] Configure email sending (verification/reset)
+- [ ] Enable rate limiting for production
+- [ ] Set up error handling
+
+## Reference Documentation
+
+### Core Authentication
+- [Email/Password Authentication](./references/email-password-auth.md) - Email/password setup, verification, password reset, username auth
+- [OAuth Providers](./references/oauth-providers.md) - Social login setup, provider configuration, token management
+- [Database Integration](./references/database-integration.md) - Database adapters, schema setup, migrations
+
+### Advanced Features
+- [Advanced Features](./references/advanced-features.md) - 2FA/MFA, passkeys, magic links, organizations, rate limiting, session management
+
+## Scripts
+
+- `scripts/better_auth_init.py` - Initialize Better Auth configuration with interactive setup
+
+## Resources
+
+- Docs: https://www.better-auth.com/docs
+- GitHub: https://github.com/better-auth/better-auth
+- Plugins: https://www.better-auth.com/docs/plugins
+- Examples: https://www.better-auth.com/docs/examples