CSharpMCP MCP Server

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