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Once OAuth is configured, all tool callbacks receive authenticated user information via the context parameter. This enables you to build personalized, user-aware tools and implement access control patterns. The authenticated user information is available in the context.auth property: 
server.tool({
  name: 'create-document',
  schema: z.object({
    title: z.string(),
    content: z.string()
  }),
  cb: async ({ title, content }, context) => {
    // Access authenticated user
    const user = context.auth
    
    // User info available:
    console.log('User ID:', user.userId)         // Unique user identifier
    console.log('Email:', user.email)            // User email
    console.log('Name:', user.name)              // Display name
    console.log('Roles:', user.roles)            // User roles
    console.log('Permissions:', user.permissions) // Permissions
    
    // Create document with user context
    const doc = await db.documents.create({
      title,
      content,
      createdBy: user.userId,
      createdByName: user.name
    })
    
    return text(`Document created by ${user.name}`)
  }
})

​
User Info Type

The context.auth object contains the following fields: 
interface UserInfo {
  userId: string              // Unique user identifier (from 'sub' claim)
  email?: string              // User email
  name?: string               // Full name
  username?: string           // Username
  nickname?: string           // Nickname or display name
  picture?: string            // Profile picture URL
  roles?: string[]            // User roles
  permissions?: string[]      // User permissions
  scopes?: string[]           // OAuth scopes granted
  
  // Provider-specific fields
  [key: string]: any          // Additional claims from provider
}

​
Standard Fields

​
userId (required)

The unique identifier for the user, extracted from the JWT sub claim. Always present and guaranteed to be unique. 
const userId = context.auth.userId // "auth0|507f1f77bcf86cd799439011"

​
email

The user’s email address. Available when the email scope is granted. 
const email = context.auth.email // "user@example.com"

​
name

The user’s full name or display name. 
const name = context.auth.name // "John Doe"

​
username

The user’s username, if different from email. 
const username = context.auth.username // "johndoe"

​
picture

URL to the user’s profile picture. 
const picture = context.auth.picture // "https://avatar.example.com/user.jpg"

​
Authorization Fields

​
roles

Array of role names assigned to the user. Used for role-based access control (RBAC). 
const roles = context.auth.roles // ["editor", "reviewer"]

// Check if user has admin role
if (context.auth.roles?.includes('admin')) {
  // Allow admin action
}

​
permissions

Array of specific permissions granted to the user. More granular than roles. 
const permissions = context.auth.permissions 
// ["documents:read", "documents:write", "users:read"]

// Check for specific permission
if (context.auth.permissions?.includes('documents:delete')) {
  // Allow document deletion
}

​
scopes

OAuth scopes granted during authentication. 
const scopes = context.auth.scopes // ["openid", "profile", "email"]

// Check if user granted email scope
if (context.auth.scopes?.includes('email')) {
  // Access email information
}

​
Extracting Custom Claims

If you need to extract custom claims differently, use the getUserInfo function in your OAuth configuration: 
import { MCPServer, oauthAuth0Provider } from 'mcp-use/server'

const server = new MCPServer({
  oauth: oauthAuth0Provider({
    domain: 'your-tenant.auth0.com',
    audience: 'https://your-api.example.com',
    
    // Custom user info extraction
    getUserInfo: (payload) => {
      return {
        userId: payload.sub,
        email: payload.email,
        name: payload.name,
        // Extract custom claims
        organizationId: payload['https://myapp.com/org_id'],
        roles: payload['https://myapp.com/roles'] || [],
        permissions: payload.permissions || [],
        // Include all other claims
        ...payload
      }
    }
  })
})

​
Next Steps