During February 2026, Lee Culver enhanced diagnostic tooling across the dotnet/diagnostics, dotnet/runtime, and perfview repositories, focusing on cross-platform reliability and maintainability. He enabled tests to run on macOS and Linux, improving coverage and robustness. Using C#, C++, and Python, Lee introduced memory analysis features such as object count sorting in DumpHeap and improved error handling for IL stubs. He addressed debugger stack dump reliability and extended symbol server support for ELF binaries. In dotnet/runtime, he prevented diagnostic tool crashes through targeted null checks, while in perfview, he refined module name display, resulting in cleaner, more accurate diagnostics output.