Use when editing .csproj, .nuspec, Directory.Build.props, Directory.Build.targets, Directory.Packages.props, the Cake build (build.cake, build.ps1, build.sh), or GitHub Actions workflows. Covers central package management, MinVer-driven versioning, the props-vs-targets split, and nuspec/csproj consistency.
Use when writing or modifying C# method bodies, type declarations, or non-trivial logic in NUnit source. Covers NUnit's taste-and-judgment conventions — exception construction, simplification, naming intent, StringComparison, non-null check form, and var usage — that aren't already caught at build time.
Use when modifying hot paths in NUnit — constraint evaluation, equality comparison, value formatting, reflection-based dispatch, collection inspection, or anything that runs once per assertion or per test discovery. Covers allocation patterns, reflection caching, and how the team expects performance claims to be…