This is a comprehensive C# reference that covers modern language features from C# 11 and 12, including primary constructors, collection expressions, and pattern matching. It's densely packed with actual code examples for async/await patterns, LINQ queries, and enterprise development scenarios. The examples are production-ready, showing things like ValueTask optimization, IAsyncEnumerable streaming, and proper cancellation token handling. If you're working on .NET 8+ projects and want Claude to write idiomatic modern C#, this gives it the context to use recent language features instead of falling back to older patterns. The code snippets are realistic enough that you could probably copy-paste them directly into a project.
npx skills add https://github.com/personamanagmentlayer/pcl --skill csharp-expert