continuing-cyan•3mo ago

MCP server user authentication

How do I add a user token to MCP server tool call when voice agent makes a call to my own mcp server?

7 Replies

To add a user token to your MCP server tool call, you can configure the tool/server with custom headers, such as:

{
  "server": {
    "url": "https://your-mcp-server.com/endpoint",
    "headers": {
      "Authorization": "Bearer your-user-token"
    }
  }
}

{
  "server": {
    "url": "https://your-mcp-server.com/endpoint",
    "headers": {
      "Authorization": "Bearer your-user-token"
    }
  }
}

This will include the user token in each request from the voice agent to your MCP server. For more details, see the server authentication documentation. Quick question:
Do you need to set a different user token for each call (per user/session), or is a static token sufficient for your use case? Sources: - Server Authentication - Custom Tools

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

continuing-cyanOP•3mo ago

@Duckie different user token for each call per user session

Vapi Support Bot•3mo ago

To set a different user token for each call/session, configure the Authorization header at the tool call level in your MCP tool configuration. This allows you to pass a unique token per request:

{
  "server": {
    "url": "https://your-mcp-server.com/endpoint",
    "headers": {
      "Authorization": "Bearer <user-session-token>"
    }
  }
}

{
  "server": {
    "url": "https://your-mcp-server.com/endpoint",
    "headers": {
      "Authorization": "Bearer <user-session-token>"
    }
  }
}

For more details, see the server authentication documentation. Clarifying question:
Are you looking to set the user token dynamically via API/backend code, or do you need to configure this manually in the dashboard for each call? Sources: - Server Authentication - Custom Tools

Sahil•3mo ago

checking if this is resolved/solved for you?

continuing-cyanOP•3mo ago

nope can't pass in unique token per session on header with liquidJS

Sahil•3mo ago

I see that you have two tickets open with the same request. I will close this one and respond to you on the other ticket.

continuing-cyanOP•3mo ago

sure

MCP server user authentication

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