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Welcome to the Copilot Studio Model Context Protocol community

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Posted on by zankard Moderator

Welcome to the Copilot Studio Model Context Protocol community. This forum is dedicated to all things related to MCP Support in Copilot Studio where you can connect with fellow users, share insights, and explore innovative ways to leverage this capability.

Want to know more about our public preview announcement? Check it out here: https://aka.ms/mcsmcp

Ask questions, share your stories, and dive into the conversation. Feel free to share any feedback, suggestions, or issues you're facing – we're here to help and eager to hear from you!

Thank you for being part of our community. We look forward to your contributions!"

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MN-22041403-0 2 on at

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Welcome to the Copilot Studio Model Context Protocol community

Hi zankard.

Thank you for replying.

I would need some clarifications about some of the comments you made:

1- I take it Copilot Studio isn't quite ready to handle incoming SSE streams ?

2- Assuming the answer to (1) is 'yes' , what endpoints should be exposed in the YAML file ?(see attached the YAML file I constructed for my custom M365 connector)

3- The MCP client , in theory, should receive an incoming SSE stream , keep the session alive and redirect to the correct endpoint that the MCP server exposes.

If I now need to expose each endpoint , we are really missing on the entire idea here ?

4- My MCP Server is actually a deployed(remote) Azure Function that has multiple MCP triggers , it is 'Anonymous' so it accepts inbound traffic and when tested via my local .NET app ( that uses Semantic Kernel to instantiate the MCP client )- it works well!

5- When I try to access the endpoint https://<function_app_name>./runtime/webhooks/mcp/sse?code='<function_key>' I get the stream:

event: endpoint data: message?azmcpcs=3RotbC1KjRJxvzoEECbWKG1olHa4xKibcikCv5Hn7YGo_EEKm6wNUJfP3BAwF8XOZu-zFD7byZtIaZx0CWjUfOcdjiq6Lny8YiimnX13t7qCZxPNTAH-UTr33nIPhm8Md6b5j5VaoqQ2LtPD-ziRkWea9-7wfMDzNVDevuKc9jPhq96Zvg&code=2umPz1y8qGq3MA02qWhj3IKswsiV5QY8XwKr4DPQNDMHAzFuAjZ_Yw== data: {"jsonrpc":"2.0","id":"c722d09d-e000-42ca-bc15-c5b2275567d1-1","method":"ping"} data: {"jsonrpc":"2.0","id":"c722d09d-e000-42ca-bc15-c5b2275567d1-2","method":"ping"}

6- You say Copilot Studio needs to have a fully qualified URL , so I wrapped it with APIM and created inbound and outbound policies to generate the following :

event: endpoint data: https://apim-erpure.azure-api.net/mcp/runtime/webhooks/mcp/message?azmcpcs=l_xZI2d2poXQ5LSlbI-lDhMMW5m3nPhRiFKsnU9LOR4md4S9QqgZyj7IA66ajWlqJA6Z6D4dlXljNc8zIumdCUL0tHjLdX8Fj-QozjQKX6sh_QtrRboXVYvvtFmADZnCiBo7MZm7ogoXPsTPolVS3ZJmM19B3ef2e9quK3sb9MEBS6nYAQ&code=bXwTHRHdZT33v1aEAsDjcVaP4VK_gpYiaOCZIsrfdIxGAzFu4TAPTA==

However , nothing works when I try to setup the connector and plug it in to Copilot Studio- everything either freezes or the connector could not be added(I can click on it for hours and nothing happens).

I think we need to jump into a session in order to debug this and see what needs to be done to resolve this.

Much have been said on the MCP capabilities but the only clients I have seen so far that are able to consume it properly are either Claude desktop or VS Code.

Hopefully we can get it solved

Thanks !

mcp_apim.yaml
zankard Moderator on at

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Welcome to the Copilot Studio Model Context Protocol community

Hi @CU08042207-0 -

Thanks for reaching out! Please make sure you that your endpoint returned in the open SSE connection call is a fully qualified URL. See https://aka.ms/mcsmcpdocs for the latest information on Known Issues.

For example:

By default, most standard SDK configurations return something like this:

event: endpoint

data: /message

But, Copilot Studio requires a fully qualified URI:

event: endpoint
data: https://microsoft.com/mcp/message

We are actively working to remove this limitation, as well as support for the Streamable Transport, to simplify this communication pattern.

Let us know if this helps resolve your issue!
CU08042207-0 2 on at

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Welcome to the Copilot Studio Model Context Protocol community

Hello,

First off, this is a fantastic and much-needed initiative—kudos to the team!

That said, I may be misunderstanding how the MCP feature in Copilot Studio is intended to work, or perhaps it's not functioning as expected in my case.

I’ve successfully created and deployed an MCP server as an Azure Function, complete with MCP tool endpoints. Everything works flawlessly when I test it via the MCP Inspector tool.

However, when I create a custom connector using the OpenAPI YAML (which could benefit from further clarification), and then try to use it as an action in Copilot Studio, the entire flow seems to freeze—nothing gets triggered or invoked.

I’ve gone through the checklist: validated IAM roles, adjusted CORS settings, and ensured the function app is running—but still no luck.

My expectation is that once the MCP connector is loaded into Copilot Studio, and the Azure Function is live, it should be able to invoke the appropriate MCP tool as needed.

Could I please get some guidance on this?

Thanks so much!

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