Content
# MCPServerExample
# MCP C# SDK
[](https://www.nuget.org/packages/ModelContextProtocol/absoluteLatest)
The official C# SDK for the [Model Context Protocol](https://modelcontextprotocol.io/), enabling .NET applications, services, and libraries to implement and interact with MCP clients and servers. Please visit our [API documentation](https://modelcontextprotocol.github.io/csharp-sdk/api/ModelContextProtocol.html) for more details on available functionality.
> [!NOTE]
> This project is in preview; breaking changes can be introduced without prior notice.
## About MCP
The Model Context Protocol (MCP) is an open protocol that standardizes how applications provide context to Large Language Models (LLMs). It enables secure integration between LLMs and various data sources and tools.
For more information about MCP:
- [Official Documentation](https://modelcontextprotocol.io/)
- [Protocol Specification](https://spec.modelcontextprotocol.io/)
- [GitHub Organization](https://github.com/modelcontextprotocol)
## Getting Started (Server)
Here is an example of how to create an MCP server and register all tools from the current application.
It includes a simple echo tool as an example (this is included in the same file here for easy of copy and paste, but it needn't be in the same file...
the employed overload of `WithTools` examines the current assembly for classes with the `McpServerToolType` attribute, and registers all methods with the
`McpTool` attribute as tools.)
```
dotnet add package ModelContextProtocol --prerelease
dotnet add package Microsoft.Extensions.Hosting
```
```csharp
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using ModelContextProtocol.Server;
using System.ComponentModel;
var builder = Host.CreateApplicationBuilder(args);
builder.Logging.AddConsole(consoleLogOptions =>
{
// Configure all logs to go to stderr
consoleLogOptions.LogToStandardErrorThreshold = LogLevel.Trace;
});
builder.Services
.AddMcpServer()
.WithStdioServerTransport()
.WithToolsFromAssembly();
await builder.Build().RunAsync();
[McpServerToolType]
public static class EchoTool
{
[McpServerTool, Description("Echoes the message back to the client.")]
public static string Echo(string message) => $"hello {message}";
}
```
## Visual Studio Code Screenshots
<img width="953" alt="image" src="https://github.com/user-attachments/assets/01425887-2f02-44f1-9ed3-90d5062e97f7" />
<img width="938" alt="image" src="https://github.com/user-attachments/assets/78f3d5e2-5d58-45d9-bbdd-c0518b5171eb" />
MCP Store
