Gives Claude direct visibility into .NET solution architecture through four core tools: visualize for project dependency graphs, erd for database schema diagrams from DbContext or ModelSnapshot files, classdiagram for inheritance and dependency trees, and stats for solution health metrics like project counts and dependency hotspots. All outputs use Mermaid.js, so Claude can render diagrams inline or save them to markdown. Useful when you're documenting a complex solution, onboarding onto an unfamiliar codebase, or need to explain architecture decisions without manually tracing through project references. Built as a .NET global tool, so it runs wherever dotnet is installed and works with both legacy .sln and modern .slnx formats.