MCP Server Integration

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Posted on by CU13052300-0

Created a custom connector to link my mcp server to the copilot agent as an action and keep getting an error, I tried multiple yaml files as below. Been struggling to get this to work for days now. Please help

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yaml file

swagger: '2.0'
info:
title: MCP Utility Server
description: >
Provides tools for multiplication, temperature conversion, and weather info
via MCP server.
version: '1.0'
host: s1mcpserver.azurewebsites.net
basePath: /
schemes:
- https
definitions:
QueryResponse:
type: object
properties:
jsonrpc:
type: string
id:
type: string
method:
type: string
params:
type: object
result:
type: object
error:
type: object
paths:
/sse:
get:
summary: MCP Server SSE Session
parameters:
- in: query
name: sessionId
type: string
required: false
produces:
- application/json
responses:
'200':
description: SSE connection established
schema:
$ref: '#/definitions/QueryResponse'
'201':
description: Session created, waiting for tool invocation
operationId: MCPServerSSE
tags:
- Agentic
- McpSse
securityDefinitions: {}
security: []

Categories:

Model context protocol

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jamiem Microsoft Employee on at

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Hi @CU13052300-0 - the MCP Community should be able to help you with this: aka.ms/mcsmcpcommunity

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zankard Microsoft Employee on at

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Hi @CU13052300-0 -

Please ensure your endpoint returned in the open SSE connection call is a fully qualified URL.

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 [microsoft.com]

You can find more resources and context in our Model Context Protocol community forum - feel free to check it out! aka.ms/mcsmcpcommunity

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CU13052300-0 10 on at

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How do I add the fully qualified url....

https://s1mcpserver.azurewebsites.net/sse

event: endpoint data: /message?sessionId=RgSacpbNA89ndf-_EjRjFA .net core 9 Progam.cs using McpServer.Tools; using ModelContextProtocol; using ModelContextProtocol.Server; var builder = WebApplication.CreateBuilder(args); // Add MCP server services builder.Services.AddMcpServer() .WithTools<MultiplicationTool>() .WithTools<TemperatureConverterTool>() .WithTools<WeatherTools>(); // Add CORS for SSE support in browsers builder.Services.AddCors(options => { options.AddDefaultPolicy(policy => { policy.AllowAnyOrigin() .AllowAnyHeader() .AllowAnyMethod(); }); }); var app = builder.Build(); // Configure the HTTP request pipeline if (app.Environment.IsDevelopment()) { app.UseDeveloperExceptionPage(); } // Enable CORS app.UseCors(); // Map MCP endpoints app.MapMcp(); // Add a simple home page app.MapGet("/", () => "MCP Server on Azure App Service - Ready for use with SSE"); app.Run();

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