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Copilot Studio - Model Context Protocol
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Copilot Studio MCP Client is incompatible with Servers using python SDK

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Posted on by FW-24061242-0 12
I have observed that servers making use of the official python sdk are not working with MS Copilot Studio. 

After a lot of digging we have found the exact reason for this problem. Python servers send back the following payload on an initialize request: 
{
  "jsonrpc":"2.0",
  "id":1,
  "result":{
     "protocolVersion":"2024-11-05",
      "capabilities":{"experimental":{},"tools":{"listChanged":false}},
      "serverInfo":{"name":"mcp-streamable-http-demo","version":"1.9.5.dev14+d0443a1"}}
}
 
In node, the following payload is sent:
 
{"result":{"protocolVersion":"2024-11-05","capabilities":{"logging":{},"tools":{"listChanged":true},"prompts":{"listChanged":true},"completions":{},"res
ources":{"listChanged":true}},"serverInfo":{"name":"simple-streamable-http-
server","version":"1.0.0"}},"jsonrpc":"2.0","id":"1"}

As you can see the type of the "id" field is integer in python, and string in node.

An integer id seems to cause the Copilot Studio Client to crash, and the follow up requests after this exchange simply don't come.

The Microsoft MCP client should support integer id's as well, since this is also part of the official spec. 
  • chrisburns Profile Picture
    chrisburns 2 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK
    @zankard - I don't think the issue is that copilot studio doesn't support it, i think it is to do with the fact that copilot studio sends the ID out in string format, but the SDK responds in a integer. It should be solveable with @CU24061549-1 's idea.. But can i hell as get the custom code to accept the modified return response. (it is almost like MCP does not want to see a manipulated return).

    This is the proxy code (i have tried to boil it down to absolute basics) - I cannot get it to work - @CU24061549-1 I would love to see how you got it to work.
     
    public class Script : ScriptBase
    {
        public override async Task<HttpResponseMessage> ExecuteAsync()
        {
            // Check if the operation ID matches what is specified in the OpenAPI definition of the connector
            //if (this.Context.OperationId == "InvokeMCP")
            //{
                    // Use the context to forward/send an HTTP request
                HttpResponseMessage response = await this.Context.SendAsync(this.Context.Request, this.CancellationToken).ConfigureAwait(continueOnCapturedContext: false);
     
                // Do the transformation if the response was successful, otherwise return error responses as-is
                if (response.IsSuccessStatusCode)
                {  
                
                    var responseString = await response.Content.ReadAsStringAsync().ConfigureAwait(continueOnCapturedContext: false);
                    
                    // Example case: response string is some JSON object
                    var result = JObject.Parse(responseString);
                    
                    // Example transformation: convert the "id" field from a number to a string
                    // Ensure the "id" field exists and is a number before transforming
                    //if (!result.ContainsKey("id") || result["id"] == null || !(result["id"] is JValue) || ((JValue)result["id"]).Type != JTokenType.Integer)
                    //{
                        // If the "id" field is not present or not a number, return an error response
                     //   HttpResponseMessage errorResponse = new HttpResponseMessage(HttpStatusCode.BadRequest);
                     //   errorResponse.Content = CreateJsonContent("The 'id' field is missing or not a number.");
                     //   return errorResponse;
                    //}
                    // Convert the "id" field to a string
                    var num = (JValue)result["id"];
                    result["id"] = num.ToString();
     
                    
                    response = new HttpResponseMessage(HttpStatusCode.OK);
                    response.Content = CreateJsonContent(result.ToString());
                    
                    }
                return response;
            //}
     
            // Handle an invalid operation ID
            //HttpResponseMessage responsefail = new HttpResponseMessage(HttpStatusCode.BadRequest);
            //responsefail.Content = CreateJsonContent($"Unknown operation ID '{this.Context.OperationId}'");
            //return responsefail;
        }
     
       
    }
  • Suggested answer
    FW-24061242-0 Profile Picture
    FW-24061242-0 12 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    See this MCP python issue:

    https://github.com/modelcontextprotocol/python-sdk/issues/961

    I will publish a workaround there.
  • FW-24061242-0 Profile Picture
    FW-24061242-0 12 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    @zankard if i understand the protocol correctly, i guess the type of the response id has to match the one that is requested ( MS Copilot Studio has a string as request id ).

    So it might be that the Python SDK is itself not compliant there, and the issue is not on your side. 
  • FW-24061242-0 Profile Picture
    FW-24061242-0 12 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    This is our swagger file, it's unmodified apart from the host, and taken from your tutorial 

    swagger: '2.0'
    info:
      title: MCP Server Python
      description: >-
        This MCP Server will work with Streamable HTTP and is meant to work with
        Microsoft Copilot Studio Python
      version: 1.0.0
    host: sm1cnpjm-8100.euw.devtunnels.ms
    basePath: /mcp
    schemes:
      - https
    consumes: []
    produces: []
    paths:
      /:
        post:
          summary: MCP Server Streamable HTTP
          x-ms-agentic-protocol: mcp-streamable-1.0
          operationId: InvokeServer
          responses: {}
    definitions: {}
    parameters: {}
    responses: {}
    securityDefinitions: {}
    security: []
    tags: []

    I tried to start a conversation with the broken agent tool in the conversation with id 1e9861f2-12a0-4fd9-93e4-33e468297794, maybe it helps.
  • FW-24061242-0 Profile Picture
    FW-24061242-0 12 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
  • FW-24061242-0 Profile Picture
    FW-24061242-0 12 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    @GO-20061201-0 the example you referenced uses SSE and i can't find a workaround there for this issue. Did you get Copilot Studio to work with python via streamable-http?

    @zankard i don't think it does. I recorded a demonstration here, i think it's pretty evident that the type of the "ID" field is the issue. Can you have a look? I will also attach reproduction steps to the post.
  • CU24061549-1 Profile Picture
    CU24061549-1 2 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    I had the same issue. I've been able to fix this by modifying the response from int to string through the proxy code available in the connector from powerapp.
  • GO-20061201-0 Profile Picture
    GO-20061201-0 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    I experienced the same thing. I'll watch this space to see the solution. In the meantime, I found this repo that demonstrates an alternative technique. Hope it helps! (Sadly, it doesn't work with streamable http)
     
  • CU25060137-1 Profile Picture
    CU25060137-1 2 on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    i am getting the issue with no tools being listed but the mcp server works in claude and vscode. i added it using the github dev streamable-http connector config. the mcp server is in python.
  • zankard Profile Picture
    zankard Moderator on at
    Copilot Studio MCP Client is incompatible with Servers using python SDK and not spec compliant
    Hi @FW-24061242-0 - sorry to hear you are encountering some issues. Copilot studio does support integer IDs as well. Can you please share the conversation ID, and if possible your swagger file? This will help us further investigate and help with troubleshooting. 

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