mitch-b/dotnet-mcp-template

.NET MCP Server Template

• Streamable HTTP transport
• OAuth support for protecting your MCP server
• Docker container build
• Aspire host for local environment

Get Started

Take this template repository and create your repo from it.

1. Rename "McpTemplate" to your app's name using renamer tool. All files, folders, and file contents will be renamed.

   # cd project root
   docker run --rm -it -v "$PWD:/data" ghcr.io/mitch-b/renamer McpTemplate YourMcp
   

What's Inside?

• Tool
• Prompt
• from appsettings configuration
• MCP server

OAuth Configuration

This sample comes configured and tested against using Microsoft Entra ID app registration for authentication and authorization support. Replace any assumptions accordingly.

Entra App Registration

Create a new App Registration in Entra.

• Name: McpTemplate Server
• Platform: Web, redirect uri: http://localhost:5000/callback

Create.

• In Overview blade:
  • Make note of the Application (client) Id - you'll use this later.
  • Make note of the Directory (tenant) Id - you'll use this later.
• In Authentication blade:
  • Ensure that Web platform has our redirect uri (needed if you're using a custom client, like the McpTemplate.Console)
• In Expose an API blade:
  • Set Application ID at the top (will be like api://<guid>)
  • Add a new scope named mcp.tools (or whatever you prefer)

OAuth for McpServer

To enable OAuth protection for your McpServer, add an OAuth section to your appsettings.json (or use user-secrets for sensitive values):

(represented here with demo GUIDs)

"OAuth": {
  "Tenant": "eb4f98a8-4c60-4348-86a0-baea7df39d74",
  "Authority": "https://login.microsoftonline.com/eb4f98a8-4c60-4348-86a0-baea7df39d74/v2.0",

  "Audience": "api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0",
  "Scopes": [ "api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0/mcp.tools" ]
}

dotnet user-secrets set OAuth:Tenant eb4f98a8-4c60-4348-86a0-baea7df39d74
dotnet user-secrets set OAuth:Authority https://login.microsoftonline.com/eb4f98a8-4c60-4348-86a0-baea7df39d74/v2.0

dotnet user-secrets set OAuth:Audience api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0
dotnet user-secrets set OAuth:Scopes:0 api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0/mcp.tools

If you do not set the OAuth section, the McpServer and Console will run in unauthenticated mode for quick local usage.

OAuth for Console (client)

(represented here with demo GUIDs)

"OAuth": {
  "Scopes": [ "api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0/mcp.tools" ],
  "ClientId": "fb35dbf1-6916-4bbf-98ed-74821d8f7ba4",
  "RedirectUri": "http://localhost:5000/callback"
}

dotnet user-secrets set OAuth:Scopes:0 api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0/mcp.tools
dotnet user-secrets set OAuth:ClientId fb35dbf1-6916-4bbf-98ed-74821d8f7ba4
dotnet user-secrets set OAuth:RedirectUri http://localhost:5000/callback

Add these in Visual Studio by right-clicking your project and selecting "Manage User Secrets". This will open a secrets.json file. Add the above secrets in the following format:

{
  "McpTemplateOptions": {
    "Endpoint": "https://{name}.openai.azure.com",
    "ApiKey": "<your_api_key>",
    "Model": "gpt-4o-mini"
  },
  "OAuth": {
    "Tenant": "eb4f98a8-4c60-4348-86a0-baea7df39d74",
    "Authority": "https://login.microsoftonline.com/eb4f98a8-4c60-4348-86a0-baea7df39d74/v2.0",

    "Audience": "api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0",
    "Scopes": [ "api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0/mcp.tools" ],

    "ClientId": "fb35dbf1-6916-4bbf-98ed-74821d8f7ba4",
    "RedirectUri": "http://localhost:5000/callback"
  }
}

Or, you can use the command line to set them:

dotnet user-secrets set McpTemplateOptions:Endpoint https://{name}.openai.azure.com
dotnet user-secrets set McpTemplateOptions:ApiKey <your_api_key>
dotnet user-secrets set McpTemplateOptions:Model gpt-4o-mini

dotnet user-secrets set OAuth:Tenant eb4f98a8-4c60-4348-86a0-baea7df39d74
dotnet user-secrets set OAuth:Authority https://login.microsoftonline.com/eb4f98a8-4c60-4348-86a0-baea7df39d74/v2.0

dotnet user-secrets set OAuth:Audience api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0
dotnet user-secrets set OAuth:Scopes:0 api://d13cafd2-01ac-4692-a1d9-aa5611d7cbe0/mcp.tools

dotnet user-secrets set OAuth:ClientId fb35dbf1-6916-4bbf-98ed-74821d8f7ba4
dotnet user-secrets set OAuth:RedirectUri http://localhost:5000/callback

Docker Image

To build the Docker image, run the following command within the src folder:

docker build \
  -f ./McpTemplate.McpServer/Dockerfile \
  -t mcp-tools:dev \
  .

docker run \
  --rm \
  -p 8080:8080 \
  -e McpTemplateOptions__Endpoint="https://{name}.openai.azure.com" \
  -e McpTemplateOptions__ApiKey="your-api-key" \
  -e McpTemplateOptions__Model="gpt-4o-mini" \
  mcp-tools:dev

Solution Design

• McpTemplate.Application: Core business logic and service registration; extend here for new features/services.
• McpTemplate.Common: Shared models and options; update for cross-project types and configuration.
• McpTemplate.Console: Console app for testing and running chat completions; useful for local development.
• McpTemplate.McpServer: Implements MCP server with tools and prompts; add new tools in Tools/, add new prompts in Prompts/, and configure in Program.cs.

Aspire Components

• McpTemplate.AppHost: Main entrypoint for hosting the application; configures and runs the Aspire Dashboard server for local development.
• McpTemplate.ServiceDefaults: Common service extensions and defaults; use for shared service setup.