Include header in the mcp call request

[quyendo00]

Currently, I am using fastapi-mcp to use my FastAPI app as an mcp server
one of my endpoint requires "request-user-id" in the header

does anyone know how to include a customized header in the mcp call request

[boyangsvl]

@pwwpche do you know if we expose http headers in the MCP toolset?

[pwwpche]

The MCP interfaces in ADK leverages the standard MCP interfaces from MCP SDK.

To add a request header, simply do

await MCPToolset.from_server(
      connection_params=SseServerParams(
          # TODO: IMPORTANT! Change the path below to your remote MCP Server path
          url="https://your-mcp-server-url.com/sse",
          headers={'request-user-id': 'your-id'},
      ),
      async_exit_stack=common_exit_stack
  )

[skyqqcloud]

I'm running into a similar issue. I'm using FastAPI + agent+MCP, in my case, the MCP server requires passing a user-specific accessToken for data permission checks. Since different users have different accessTokens, I need to pass them dynamically with each request.

However, the method mentioned above seems to only allow setting the token during initialization, which doesn't work for my case. Is there a way to pass the token dynamically per request?

[joaquinperaza]

Facing same issues with OpenAPIToolSet

[ekirkland]

I am facing the same issue. Currently I've worked around it by implementing a toolset that delegates to a newly created MCPToolset each time get_tools is called, but this is not a very good solution.

Similar to this, I have a use case where I may want a unique URL per-request as well (i.e. tenant.someservice.com) so that would be nice to override each time. The delegate solution for this use case isn't quite as bad as the per-user header though.