Copilot Studio MCP Client is incompatible with Servers using python SDK

(6) Share

Report

Posted on by FW-24061242-0

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.

Categories:

Model context protocol

I have the same question (0)

All responses (14)

Answers (0)

zankard Moderator on at

Like (0)

Report

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.

Was this reply helpful? Yes No
CU25060137-1 4 on at

Like (1)

Report

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.

Was this reply helpful? Yes No
GO-20061201-0 on at

Like (1)

Report

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)

https://github.com/swatDong/mcp-sample-vsc-debug

Was this reply helpful? Yes No
CU24061549-1 4 on at

Like (1)

Report

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.

Was this reply helpful? Yes No
FW-24061242-0 26 on at

Like (0)

Report

@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.

Was this reply helpful? Yes No
FW-24061242-0 26 on at

Like (0)

Report

https://www.loom.com/share/a38bbc37964047c2a1231c1c1efd377b

Was this reply helpful? Yes No
FW-24061242-0 26 on at

Like (0)

Report

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.

Was this reply helpful? Yes No
FW-24061242-0 26 on at

Like (0)

Report

@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.

Was this reply helpful? Yes No
Suggested answer

FW-24061242-0 26 on at

Like (0)

Report

See this MCP python issue:

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

I will publish a workaround there.

Was this reply helpful? Yes No
chrisburns 2 on at

Like (0)

Report

@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.

EDIT:

I got it working.... For anyone else stumbling on this post and needing a fix at Copilot Studio level, here is the proxy code i used to get it to work. (The reason i struggled was i kept assuming the response was pure JSON. it wasn't it is SSE Events.

https://github.com/EgoManiac/CopilotStudioMCPFix/blob/main/README.md

Was this reply helpful? Yes No