How to call an MCP request from inside a tool method

[AezanPathan]

Pre-submission Checklist

• I have checked that this question would not be more appropriate as an issue in a specific repository
• I have searched existing discussions and documentation for answers

Question Category

• Protocol Specification
• SDK Usage
• Server Implementation
• General Implementation
• Documentation
• Other

Your Question

Hi, I’m new to MCP and AI development, and I’m stuck on one thing.

I have created a tool with [McpServerTool], but inside that tool method I want to call the AI agent directly and get the response back into the same method.

I tried using RequestContext.SendMessageAsync but I can’t figure out the correct way to both send the request and capture the response message.

Basically:

From inside my tool, I want to send a message to the MCP agent.

Then I want to get the response and use it inside the tool method (e.g. save it to a file).

If anyone can share the proper way to do this (or point me to a reference/example), it would help a lot 🙏.

Thanks!

[PederHP]

You can take a look at the Elicitation use in the samples folder. This is how you can request extra information from the user during a tool call.

[AezanPathan]

Thanks your hint helped me check the samples again and I got it working.
For anyone else stuck, this worked for me:

var samplingResponse = await thisServer.AsSamplingChatClient()
    .GetResponseAsync(prompt, options, cancellationToken);

Now I can call the agent inside the tool and use the response directly.