During November 2024, Don Jayamanne modernized notebook metadata handling in the dotnet/interactive repository by removing the legacy 'custom' property and refactoring utilities to standardize on the 'metadata' field for polyglot notebook information. This work, implemented using TypeScript and JavaScript within the context of VS Code extension development, simplified metadata management and reduced technical debt. By aligning metadata storage with current standards, Don improved interoperability across kernels and paved the way for future enhancements. The changes focused on code clarity and maintainability, addressing a core architectural concern rather than bug fixes, and demonstrated thoughtful engineering depth within a short timeframe.