MapMcp() is not mapping any andpoints?

[szatixx]

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• I have checked that this question would not be more appropriate as an issue in a specific repository
• I have searched existing discussions and documentation for answers

Question Category

• Protocol Specification
• SDK Usage
• Server Implementation
• General Implementation
• Documentation
• Other

Your Question

I made a test project for SDK version 0.1.0-preview.9 based on the asp.net core sample found in the repository. I think I made everything the same way, but there is no any MCP endpoint present.
If I check the OpenAPI spec the endpoints are missing and also the 'MCP Inspector v0.9.0' tool cant connect.

Is it an SDK bug, or did I made a mistake?

Thanks
Attila

Program.cs:

`using OpenTelemetry.Metrics;
using OpenTelemetry.Trace;
using OpenTelemetry;
using McpServerProof;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddMcpServer()
.WithHttpTransport()
.WithTools();

builder.Services.AddOpenApi();

builder.Services.AddOpenTelemetry()
.WithTracing(b => b.AddSource("")
.AddAspNetCoreInstrumentation()
.AddHttpClientInstrumentation())
.WithMetrics(b => b.AddMeter("")
.AddAspNetCoreInstrumentation()
.AddHttpClientInstrumentation())
.WithLogging()
.UseOtlpExporter();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.MapOpenApi();
}

app.MapMcp();
app.MapGet("/hello", () => "Hello World!");

app.Run();`

ToolClass.cs:
`using ModelContextProtocol.Server;
using System.ComponentModel;

namespace McpServerProof;

[McpServerToolType]
public sealed class ToolClass
{
[McpServerTool,Description("Returns the current date and time.")]
public static string GetDateTime(
IMcpServer thisServer,
[Description("True if the date and time should be UTC, otherwise it will be local time zone.")] bool isUtc,
CancellationToken cancellationToken)
{
return isUtc
? DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ")
: DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss");
}
}`

Project file:
`

net9.0 enable enable

`

[canerunutkan]

I am not sure but you may check launchSettings.json

Also you may take a look samples folder if not.

https://github.com/modelcontextprotocol/csharp-sdk/blob/main/samples/AspNetCoreSseServer/Properties/launchSettings.json

[szatixx]

Thanks, but I was fallowing the liked example.
See my launchSettintgs bellow, but I think problem is somewhere else.

{
"$schema": "https://json.schemastore.org/launchsettings.json",
"profiles": {
"http": {
"commandName": "Project",
"dotnetRunMessages": true,
"launchBrowser": false,
"applicationUrl": "http://localhost:5004",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
}
}
}
}