HandMirrorMcp

What it is

A .NET inspection server that answers API questions from the assemblies themselves. It reads public types, members and XML documentation out of a DLL or a NuGet package, so an agent can check a signature before writing the call that would not have compiled.

What you get

• Assembly reading down to the member — inspect_assembly for every public type with its attributes and XML docs, list_namespaces for the shape, get_type_info for one type
• NuGet exploration without leaving the session: search_nuget_packages, get_nuget_package_info, get_nuget_package_versions, inspect_nuget_package, inspect_nuget_package_type
• Supply-chain and packaging checks — get_nuget_vulnerabilities for known advisories, inspect_nupkg_contents and extract_nupkg_file for what is actually inside the package, list_nuget_sources and clear_nuget_cache for the local feed
• Native interop laid out explicitly: inspect_native_dependencies finds DllImport, LibraryImport and COM types in an assembly
• Project-level diagnosis — analyze_csproj, analyze_solution, analyze_config_file, analyze_packages_config, analyze_file_based_app, and explain_build_error for compiler errors
• get_system_info and get_dotnet_info report the OS, hardware and the .NET installations actually present

Requirements

The .NET 8.0 SDK or later, and nothing else — no account, no key, and no network beyond the NuGet feeds you already use. Published on NuGet as HandMirrorMcp; from source it is git clone, dotnet build, and a client entry that runs dotnet with --project pointed at the HandMirrorMcp directory, or the built executable directly. Assembly inspection runs on Mono.Cecil and package operations on NuGet.Protocol.

Setup effort

Build from source — git clone https://github.com/rkttu/HandMirrorMcp.git

Tools you get

22 tools named in the project's documentation. search_nuget_types, find_package_by_type, inspect_nuget_native_libs and inspect_nuget_native_exports appear in a test playbook but are not tools.

Requires

• .NET 8.0 SDK
• MCP-compatible client (e.g., Claude Desktop, VS Code with Copilot)

Where it runs

Both documented clients run the server on your machine.