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CSharpMCP MCP Server

@li-zhixin

Repository

Basic information

Category

Other

Transports

stdio

Author

li-zhixin

About CSharpMCP MCP Server

A Roslyn-based mcp server for dynamically executing C# code snippets

#csharp#mcp#code-interpreter

CSharpMCP MCP Server config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

CSharpMCP MCP Server tools

3

Execute the provided C# code, and the state (like variables) will be preserved each time.

Clean the code execution context, all states will be cleared.

Get the history code.

Overview

What is CSharpMCP?

CSharpMCP is a Model Context Protocol (MCP) server for executing C# code using the Roslyn compiler. It is intended for developers who need to run C# snippets programmatically, with state persistence across executions.

How to use CSharpMCP?

To use CSharpMCP, configure it as an MCP server in your MCP client application. To reference existing projects, compile the project and pass the path of the resulting DLL as a startup parameter; the server will add those assemblies as references. Invoke the provided tools (RunAsync, CleanExecuteContext, GetHistoryCode) from your MCP client.

Key features of CSharpMCP

  • Execute C# code snippets with Roslyn
  • State (variables) preserved across calls
  • Clear execution context and reset state
  • Retrieve previously executed code history
  • Support for referencing external compiled DLLs

Use cases of CSharpMCP

  • Running C# scripts interactively within an MCP-aware environment
  • Prototyping C# logic without creating a full project
  • Testing small code fragments with persistent state
  • Integrating C# code execution into AI-assisted coding workflows

Frequently asked questions

1

What does RunAsync do?

RunAsync executes the provided C# code and preserves the state (variables) between calls, allowing incremental code execution.

2

How do I clean the execution state?

Use the CleanExecuteContext tool to clear all state and reset the execution context.

3

Can I use existing C# libraries?

Yes. Compile the project to a DLL, then pass that DLL path as a startup parameter when launching CSharpMCP.

4

What are the security implications?

This server executes arbitrary C# code on the local machine. Use with caution and only in trusted environments.

5

How do I retrieve previously executed code?

Use the GetHistoryCode tool to retrieve the full history of code that has been executed.

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