phil-scott-78/dotnet-lens-mcp

dotnet-lens-mcp

A Model Context Protocol (MCP) server that brings Roslyn-powered code intelligence to your AI assistant.

What does it do?

This MCP server lets AI assistants understand C# code deeply by providing semantic analysis tools:

• Type resolution - Hover over any variable or expression to see its actual type
• Find definitions - Jump to where symbols are defined, just like F12 in VS
• Find references - See everywhere a symbol is used across your solution
• Explore APIs - Get IntelliSense-style member listings at any code position
• Navigate inheritance - Find implementations, derived types, and base classes
• Check build errors - Get real compiler diagnostics for your code

Getting Started

From NuGet (Recommended)

Install with Claude Code

claude mcp add dotnet-lens dnx -- "dotnet-lens-mcp@0.1.0-beta" "--yes"

Manual Configuration

Configure your AI assistant to use the published package:

{
  "servers": {
    "dotnet-lens": {
      "type": "stdio",
      "command": "dnx",
      "args": ["dotnet-lens-mcp", "--version", "0.1.0-beta", "--yes"]
    }
  }
}

From Source

For development or testing:

{
  "servers": {
    "dotnet-lens": {
      "type": "stdio",
      "command": "dotnet",
      "args": ["run", "--project", "/path/to/DotnetLensMcp"]
    }
  }
}

Usage

Once configured, your AI assistant gains these capabilities:

1. First, initialize the workspace - The AI will scan for .sln or .csproj files
2. Then use any analysis tools - Get type info, find references, check for errors, etc.

Example prompts:

• "Find all places where this method is called"
• "Show me what methods I can call on this object"
• "What classes implement this interface?"

Requirements

• .NET 9.0 or later
• A C# project or solution to analyze

Feedback & Issues

Found a bug? Not surprised! Please open an issue on our GitHub repository.