Better Auth MCP Server

A modern Model Context Protocol (MCP) server for the Better Auth authentication framework.
This server provides developer-friendly tools, searchable documentation, ready-to-use integrations, and configuration generators for authentication providers, database adapters, and plugins.

---

✨ Highlights

• 📚 Full Documentation Access – categorized, searchable, and framework-specific examples
• 🔐 Authentication Providers – Email/Password, Google, GitHub, Apple, Microsoft, Facebook, and more
• 🗄️ Database Adapters – PostgreSQL, MySQL, SQLite, MongoDB, Prisma, Drizzle
• 🔧 Plugins & Extensions – OTP, Magic Link, 2FA, Passkey, Organization Management, API Tokens
• ⚙️ Smart Tools – Config generation, validation, migration guides, and framework integration
• 🔒 Security Built-in – CSRF protection, secure cookies, rate limiting, WebAuthn/Passkeys, 2FA

---

🚀 Quick Start

Install via Smithery (Recommended)

npx -y @smithery/cli install @dabhivijay2478/auth --client claude

Manual Setup

git clone <repository-url>
cd better-auth-mcp-server
npm install
npm run build

Update claude_desktop_config.json:

{
  "mcpServers": {
    "better-auth": {
      "command": "node",
      "args": ["path/to/dist/index.js"],
      "env": {
        "NODE_ENV": "production"
      }
    }
  }
}

---

🛠️ Core Tools

Documentation

• list_better_auth_features – List all available features and plugins
• get_feature_details – Get details for a specific feature or plugin
• search_better_auth – Search Better Auth documentation

Integrations

• get_integration_guide – Framework-specific setup (Next.js, Nuxt, Remix, SvelteKit, Expo, etc.)
• get_auth_examples – Code snippets and usage examples

Advanced Context

• target_llms_context – Access Better Auth LLMs.txt for comprehensive context

---

📦 Usage Examples

1. Generate a Complete Auth Config

const setup = await generate_auth_config({
  providers: ["email-password", "google", "github"],
  adapter: "postgresql",
  plugins: ["magic-link", "two-factor"],
  framework: "nextjs"
});

console.log(setup.serverConfig);

2. Get Provider Config

const google = await get_auth_provider_config({ provider_name: "google" });
console.log(google.setupSteps);

3. Validate Config

const validation = await validate_auth_setup({
  config: "your auth.ts config here",
  framework: "nextjs"
});
console.log(validation);

---

🔐 Security Features

• CSRF Protection – Safe request handling
• Session Security – Rotation, expiration, validation
• Passkeys & WebAuthn – FIDO2 support
• Two-Factor Auth – TOTP, backup codes
• Rate Limiting – Prevent abuse
• Password Security – Strong hashing and validation

---

🏗️ Architecture

• Language: TypeScript (ES2022 target)
• Validation: Zod schemas
• Protocol: Model Context Protocol (MCP)
• Code Generation: Production-ready configs and migration scripts
• Error Handling: Detailed and recoverable

---

🤝 Contributing

1. Clone repo
2. Install dependencies: npm install
3. Build: npm run build
4. Update src/index.ts with new features

When Better Auth adds features:

• Extend AUTH_PROVIDERS, DATABASE_ADAPTERS, PLUGINS
• Add documentation mappings
• Write tool handlers
• Test thoroughly

---

📄 License

MIT License – see LICENSE file

---

🔗 Resources

• Better Auth Docs
• Smithery Package
• MCP Protocol
• TypeScript Docs

---