NuGet Cache MCP Server

Features

• Package Discovery: List and search cached NuGet packages
• Type Exploration: List types with wildcard filtering, view type definitions with full member details
• Version Comparison: Compare API changes between package versions with breaking change detection
• XML Documentation: Access XML documentation for methods and types
• Meta-package Detection: Identifies packages that contain only dependencies (no code)

Installation

.NET Tool Using dnx (no install)

Requires .NET 10

{
  "servers": {
    "nuget-cache": {
      "command": "dnx",
      "args": ["Maagaard.NuGetCacheMcp", "--yes"],
      "env": {
        "NUGET_CACHE_PATH": "C:/custom/nuget/cache" //Optional. Default value: ~/.nuget/packages
      }
    }
  }
}

.NET Tool installed locally

Install as a global .NET tool. Requires .NET 10.

dotnet tool install -g Maagaard.NuGetCacheMcp

mcp configuration (e.g. mcp.json):

{
  "servers": {
    "nuget-cache": {
      "command": "nuget-cache-mcp",
      "env": {
        "NUGET_CACHE_PATH": "C:/custom/nuget/cache" //Optional. Default value: ~/.nuget/packages
      }
    }
  }
}

.NET Local executable

Requires .NET 10

Download the latest release from the Releases page:

• NuGetCacheMcp.exe - Windows x64
• NuGetCacheMcp - Linux x64

mcp configuration (e.g. mcp.json):

{
  "servers": {
    "nuget-cache": {
      "command": "C:/path/to/NuGetCacheMcp.exe",
      "env": {
        "NUGET_CACHE_PATH": "C:/custom/nuget/cache" //Optional. Default value: ~/.nuget/packages
      }
    }
  }
}

Docker

If you dont trust this random mcp server (and you probably shouldn't!) you can run it in docker and prevent network access.

Note: When running Docker in WSL with volume mounts to the Windows filesystem, performance may be significantly slower due to cross-filesystem access. The initial traversing of the nuget cache can take minutes. For best performance, consider using the .NET tool or executable directly.

mcp configuration (e.g. mcp.json):

{
  "servers": {
    "nuget-cache": {
      "command": "docker",
      "args": [
        "run", "-i", "--rm",
        "~/.nuget/packages:/nuget-cache",
        "ghcr.io/sorenmaagaard/nugetcachemcp:latest"
      ],
      "env": {
        "NUGET_CACHE_PATH": "/nuget-cache"
      }
    }
  }
}

Using Claude code?

All the following examples above are for mcp.json. For claude code mcp configuration (e.g. ~/.claude.json) the mcp server should be put into the mcpServers section instead of servers e.g.

{
  "mcpServers": {
    "nuget-cache": {
      ...
    }
  }
}

Build from Source

Requires .NET 10 SDK.

git clone https://github.com/SorenMaagaard/NugetCacheMcp.git
cd NugetCacheMcp
dotnet build NuGetCacheMcp.slnx
dotnet publish NugetCacheMcp/NuGetCacheMcp.csproj -c Release -r win-x64 -o ./publish/win-x64

Environment Variables

Variable	Description	Default
NUGET_CACHE_PATH	Path to NuGet packages cache	~/.nuget/packages

Available Tools

list_cached_packages

List packages in the NuGet cache with optional filtering and pagination.

Parameters:

• filter (optional): Filter packages by name pattern
• cursor (optional): Pagination cursor
• pageSize (optional): Number of results per page (default: 50)

get_package_info

Get detailed information about a cached package.

Parameters:

• packageId: The NuGet package ID
• version (optional): Specific version (defaults to latest)

list_types

List public types in a package with filtering options.

Parameters:

• packageId: The NuGet package ID
• version (optional): Package version
• namespaceFilter (optional): Filter by namespace prefix
• typeKind (optional): Filter by type kind (class, interface, enum, struct, delegate)
• filter (optional): Wildcard pattern for type names (*Converter, *Message*, Api.Models.*)

get_type_definition

Get full definition of a type including members, inheritance, and documentation.

Parameters:

• packageId: The NuGet package ID
• typeName: The type name (simple or full name)
• version (optional): Package version

get_method_documentation

Get detailed documentation for a specific method.

Parameters:

• packageId: The NuGet package ID
• typeName: The containing type name
• methodName: The method name
• version (optional): Package version

compare_package_versions

Compare API changes between two versions of a package.

Parameters:

• packageId: The NuGet package ID
• fromVersion: The older version
• toVersion: The newer version

Development

Prerequisites

• .NET 10 SDK
• Docker (optional, for container builds)

Running Tests

dotnet test --project NugetCacheMcp.Tests/NuGetCacheMcp.Tests.csproj

Building Docker Image

docker build -t nugetcachemcp .

Credits

This project was inspired by DimonSmart/NugetMcpServer, which provides similar functionality using NuGet feeds. This implementation focuses on the local NuGet cache for offline and faster access.

License

This project is licensed under the MIT License - see the LICENSE file for details.