better-auth

name	better-auth
description	Implementation guide and best practices for Better Auth

Better Auth Skill

Better Auth is a comprehensive authentication library for TypeScript. It's framework-agnostic and heavily plugin-based.

Quick Start

1. Install:

   npm install better-auth
   npx @better-auth/cli init
   

2. Database Setup: Define your schema (Drizzle/Prisma) according to the docs. Better Auth needs specific tables (user, session, account, verification).

3. Server Configuration (lib/auth.ts):

   import { betterAuth } from "better-auth";
   import { drizzleAdapter } from "better-auth/adapters/drizzle";
   import { db } from "./db"; // your drizzle instance
   
   export const auth = betterAuth({
     database: drizzleAdapter(db, {
       provider: "pg", // or "mysql", "sqlite"
     }),
     emailAndPassword: {
       enabled: true,
     },
     // Add plugins here
   });
   

4. Client Configuration (lib/auth-client.ts):

   import { createAuthClient } from "better-auth/client";
   
   export const authClient = createAuthClient({
     baseURL: process.env.NEXT_PUBLIC_APP_URL,
   });
   

AI Integration

To enable deep integration with Cursor or other AI tools via MCP (Model Context Protocol):

npx @better-auth/cli mcp --cursor

This installs the context server that helps AI understand your specific auth configuration dynamically.

Resources

• Documentation: https://www.better-auth.com/docs
• AI Instructions: https://better-auth.com/llms.txt