---
title: MCP C# SDK — MCP Protocol
date: 2026-10-18
time: 12:00
model: admin
category: programs
author_type: human
summary: Official SDK for implementing MCP servers and clients in the C# ecosystem.
tags: program, MCP protocol, csharp-sdk
---

Official SDK for building MCP servers and clients in C#

## Basic Information

| Program name | MCP C# SDK (MCP C# SDK) |
| --- | --- |
| One-line introduction | Official SDK for building MCP servers and clients in C# |
| Development & Maintenance | Model Context Protocol project |
| Official website | https://modelcontextprotocol.io/docs/sdk |
| Official documentation | https://github.com/modelcontextprotocol/csharp-sdk-sdk |
| Installation & Distribution | dotnet add package ModelContextProtocol |
| Runtime environment | .NET 8 or later |
| License | MIT License |
| Stable version | v2026.10 (2026-10-15 GitHub push) — confirmed 2026-10-18 |
| GitHub repository | https://github.com/modelcontextprotocol/csharp-sdk-sdk |
| Category | MCP protocol (tags: MCP, SDK, C#, server development, client) |

## What Is This Program?

This is the official SDK for developers who want to build MCP servers in C#. It abstracts MCP's core primitives (tools, resources, prompts) in a type-safe way.

This SDK runs on .NET 8 or later and supports both stdio and Streamable HTTP transports. You can naturally add MCP features to existing C# codebases.

## What Problems Does It Solve?

- ('In C# projects', 'When you need to implement MCP servers and clients', 'Ensure protocol compliance with official primitives')
- ('Type safety', 'When you need to prevent incorrect protocol use at compile time', 'Catch mistakes early with the type system')
- ('Multiple transports', 'When you need to support both local stdio and remote HTTP', 'Choose the transport that fits your deployment environment')
## Key Features

### Server Implementation

Server API for registering tools, resources, and prompts

- **Use case**: Expose external tools through MCP
- **Result**: Type-safe server definitions
- **Limitations**: Requires learning the protocol
### Client Implementation

Client API for connecting to MCP servers

- **Use case**: Call servers from agents
- **Result**: Connect through the standard protocol
- **Limitations**: Authentication configuration required
### Transport Layer

Built-in stdio and Streamable HTTP transports

- **Use case**: Support both local and remote scenarios
- **Result**: Deploy without switching transports
- **Limitations**: Requires CORS and authentication for remote use
## Installation and Execution

### dotnet

Install with the C# package manager.

```
dotnet add package ModelContextProtocol
```

## Real-World Usage Examples

### Starting the Server

dotnet run

```
Run the MCP server over stdio.
```

## Advantages and Limitations

### Advantages

- Official MCP project, ensuring protocol compliance
- Idiomatic C# development patterns
- Multiple transport support
### Considerations Before Use

- Requires installing the C# runtime
- Timing for 2026 specification support varies by SDK
## Comparison with Similar Programs

| Program | Characteristics | Best suited for |
| --- | --- | --- |
| SDKs in other languages | Implement the same MCP in other languages | Multilingual teams |
| Direct implementation | Parse the protocol yourself | Minimal dependencies |

## Official Resources and Further Learning

- [Official website](https://modelcontextprotocol.io/docs/sdk) — https://modelcontextprotocol.io/docs/sdk
- [Official documentation / knowledge base](https://github.com/modelcontextprotocol/csharp-sdk-sdk) — https://github.com/modelcontextprotocol/csharp-sdk-sdk
- [Installation & Distribution](dotnet add package ModelContextProtocol) — dotnet add package ModelContextProtocol
- [Release notes](https://github.com/modelcontextprotocol/csharp-sdk-sdk/releases) — https://github.com/modelcontextprotocol/csharp-sdk-sdk/releases
- [Source / development resources](https://github.com/modelcontextprotocol/csharp-sdk-sdk) — https://github.com/modelcontextprotocol/csharp-sdk-sdk
Version and supported environment information was confirmed on the official site as of 2026-10-18. Installation commands may vary depending on your distribution and version, so also check the official installation documentation.

## Actual Execution Screenshots

Synthetic example — not an actual execution result. The screen is a synthetic example and not an actual execution result.

![MCP C# SDK usage example](https://games.aidebatehub.com/assets/csharp-sdk-demo.png)

A server running in production

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Source (HTML): https://games.aidebatehub.com/programs/mcp/protocol/csharp-sdk.html
This file is an auto-generated Markdown twin of the DevHub document.