Better Auth

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MCP Server for Authentication Management

Enterprise-grade authentication solution providing:

• 🔐 Secure credential management with AES-256 encryption
• ⚙️ Multi-protocol auth (OAuth2, SAML, LDAP)
• 🛡️ Real-time threat detection and prevention

Features

Core Tools

• analyze_project - Analyze project structure for auth setup recommendations
• setup_better_auth - Configure auth providers with project ID and API key
• analyze_current_auth - Detect existing auth.js/next-auth implementations
• generate_migration_plan - Create step-by-step migration path

Testing & Security

• test_auth_flows - Validate login/register/reset/2fa flows
• test_security - Run OWASP-aligned security checks
• analyze_logs - Review auth system logs for issues
• monitor_auth_flows - Real-time authentication monitoring

Available Resources

• better-auth://config - Current Better-Auth configuration settings
• better-auth://logs - Authentication system logs

Development

Clone and install:

git clone https://github.com/better-auth-mcp-server/better-auth-mcp-server.git
cd better-auth-mcp-server
npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Configuration

Environment Variables

# Required
BETTER_AUTH_PROJECT_ID=your-project-id
BETTER_AUTH_API_KEY=your-api-key

# Optional
BETTER_AUTH_ENV=development|staging|production
LOG_LEVEL=info|debug|error

Security Best Practices

1. API Key Management

   • Store API keys in environment variables
   • Rotate keys regularly
   • Use different keys per environment

2. Access Control

   • Implement rate limiting
   • Configure IP allowlists
   • Use principle of least privilege

3. Monitoring

   • Enable audit logging
   • Monitor auth failures
   • Set up alerts for suspicious activity

Installation

Installing via Smithery

To install Better Auth MCP Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @nahmanmate/better-auth-mcp-server --client claude

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "better-auth-mcp-server": {
      "command": "node",
      "args": ["/path/to/better-auth-mcp-server/build/index.js"],
      "disabled": false,
      "alwaysAllow": []
    }
  }
}

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

Usage Examples

Project Setup

// Initialize Better-Auth in your project
await mcp.useTool('setup_better_auth', {
  projectPath: './my-next-app',
  config: {
    projectId: process.env.BETTER_AUTH_PROJECT_ID,
    apiKey: process.env.BETTER_AUTH_API_KEY
  }
});

// Test core authentication flows
await mcp.useTool('test_auth_flows', {
  flows: ['login', 'register', '2fa']
});

Migration from Auth.js/NextAuth

// Analyze current auth implementation
await mcp.useTool('analyze_current_auth', {
  projectPath: './my-next-app'
});

// Generate migration steps
await mcp.useTool('generate_migration_plan', {
  projectPath: './my-next-app',
  currentAuthType: 'next-auth'
});