Power Platform Community Forum Thread Details

Custom connector not able to connect with MCP Server built in C# .NET SDK

I have created an MCP Server in .NET C# SDK and deployed via Visual Studio in Azure. However, while creating the custom connection in Power App Platform, I am not able to test the connection successfully. Kindly help with correct specification for MCP Server custom connector in C# .Net Implementation. It works with MCP Inspector, VSCode GitHub Copilot in Agent mode but just not with Copilot Studio.

This is the swagger that shows up -

```
swagger: '2.0'
info:
  title: MCP Server
  description: >-
    This MCP Server will work with Streamable HTTP and is meant to work with
    Microsoft Copilot Studio
  version: 1.0.0
host: <host>.azurewebsites.net
basePath: /
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: []

```

## Program.cs

```
var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddLogging();

// Register MCP actions
builder.Services.AddScoped<AnalyzeAppInsightsAction>();
builder.Services.AddScoped<TriggerUatDeploymentAction>();

// Add MCP Server with automatic action discovery
builder.Services.AddMcpServer().WithHttpTransport().WithTools<AnalyzeAppInsightsAction>().WithTools<TriggerUatDeploymentAction>();

var app = builder.Build();

// Enable MCP endpoints
app.MapMcp();

app.UseHttpsRedirection();

await app.RunAsync();

```

## Tool/Action -

```
[McpServerToolType]
public class AnalyzeAppInsightsAction
{
[McpServerTool, Description("Analyzes Application Insights.")]
public async Task<JsonElement> AppInsightsLoad(bool input, CancellationToken cancellationToken)
{
  /// code here
}
}

```

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