DotNetDevMCP

Installation

You need the .NET 10 SDK (dotnet --version shows 10.x). Your own solution can target older frameworks; the SDK only has to be able to build it.

DotNetDevMCP runs through dotnet dnx, which downloads the package from NuGet on first use and runs it. Nothing to install by hand. The examples use "command": "dotnet" with dnx as the first argument: it works on every OS and in clients that start servers without a shell (a bare dnx command can fail there on Windows, where dnx is a .cmd script).

Claude Code

claude mcp add dotnetdevmcp -- dotnet dnx DotNetDevMCP --yes

Load a solution at startup, so the first question is fast:

claude mcp add dotnetdevmcp -- dotnet dnx DotNetDevMCP --yes -- --load-solution /path/to/MyApp.sln

VS Code (GitHub Copilot)

.vscode/mcp.json in your repository:

{
  "servers": {
    "dotnetdevmcp": {
      "type": "stdio",
      "command": "dotnet",
      "args": ["dnx", "DotNetDevMCP", "--yes"]
    }
  }
}

The NuGet page has an MCP Server tab with a ready-made version of this that asks for a solution path.

Visual Studio

.mcp.json next to your solution (or %USERPROFILE%\.mcp.json for every solution), same content as VS Code above.

Cursor, Claude Desktop and other clients

These use the mcpServers form. Cursor: .cursor/mcp.json or ~/.cursor/mcp.json. Claude Desktop: Settings → Developer → Edit config.

{
  "mcpServers": {
    "dotnetdevmcp": {
      "command": "dotnet",
      "args": ["dnx", "DotNetDevMCP", "--yes", "--", "--load-solution", "C:/src/MyApp/MyApp.sln"]
    }
  }
}

Everything after -- goes to DotNetDevMCP itself; see Configuration.

Permanent install instead of dnx

dotnet tool install -g DotNetDevMCP

Then use dotnetdevmcp as the command, with no dnx arguments. Update with dotnet tool update -g DotNetDevMCP.

Pin a version

dnx DotNetDevMCP uses the latest version. For a team setup, pin it: DotNetDevMCP@0.3.1.

Check it works

Ask your agent: “Which DotNetDevMCP tools do you have?” It should list 37 tools, such as SharpTool_LoadSolution, SharpTool_FindReferences and dotnet_test_affected. If not, see Troubleshooting.

Next: Tutorial.

This site is open source. Improve this page.