Roslyn Mcp

io.github.darylmcd/roslyn-mcp · v5.0.1

Local-first MCP server for semantic C# analysis & refactoring via Roslyn & MSBuildWorkspace.

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add roslyn-mcp -e ROSLYNMCP_SANCTIONED_ROOTS=<ROSLYNMCP_SANCTIONED_ROOTS> -- dnx Darylmcd.RoslynMcp --yes

claude_desktop_config.json

{
  "mcpServers": {
    "roslyn-mcp": {
      "command": "dnx",
      "args": [
        "Darylmcd.RoslynMcp",
        "--yes"
      ],
      "env": {
        "ROSLYNMCP_SANCTIONED_ROOTS": "<ROSLYNMCP_SANCTIONED_ROOTS>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "roslyn-mcp": {
      "command": "dnx",
      "args": [
        "Darylmcd.RoslynMcp",
        "--yes"
      ],
      "env": {
        "ROSLYNMCP_SANCTIONED_ROOTS": "<ROSLYNMCP_SANCTIONED_ROOTS>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "roslyn-mcp": {
      "type": "stdio",
      "command": "dnx",
      "args": [
        "Darylmcd.RoslynMcp",
        "--yes"
      ],
      "env": {
        "ROSLYNMCP_SANCTIONED_ROOTS": "<ROSLYNMCP_SANCTIONED_ROOTS>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`ROSLYNMCP_SANCTIONED_ROOTS` Optional	Server-owned filesystem boundary for path validation and solution discovery. Path-separator-delimited (';' on Windows, ':' on macOS/Linux). '.' scopes the server to its working directory. An empty value fails closed: every path-taking tool rejects its input.

Details

Package	`[email protected]` (NUGET, stdio)
First published	7 Nov 2026
Last updated	7 Nov 2026
Registry name	`io.github.darylmcd/roslyn-mcp`

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Live status

Local install

Installed and run on your own machine, so there is no public endpoint to check.

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