C# MCP SDK

The C# MCP SDK enables developers to build and host Model Context Protocol (MCP) servers using the .NET framework. It is the Tier-1 choice for integrating enterprise-grade .NET services into agentic workflows.

Core Components

• McpServer: The host object that manages the connection and tool registration.
• Resource Templates: Patterns for exposing structured data (e.g., database records) as URI-addressable resources.
• Tool Definitions: Strongly-typed C# methods that the LLM can invoke.

Implementation with ASP.NET Core

The C# SDK is typically hosted within an ASP.NET Core application, allowing it to leverage:

• Dependency Injection: To resolve services like DbContext or ILogger.
• Middleware: For authentication and logging.
• Kestrel: For high-speed transport over JSON-RPC.

Example Pattern

[McpTool("get_vault_stats", "Returns total notes and graph density.")]
public async Task<string> GetVaultStats() 
{
    // Implementation using internal vault scripts
}

References

• mcp-architecture
• aspnet-core-basics
• dotnet-dependency-injection
• ms-semantic-kernel
• microsoft-data-sqlite-agent-patterns
• dotnet-mcp-server-patterns