Worked on enhancing the dotnet/command-line-api repository by delivering a feature that expands the extensibility of the CLI library. Focused on API development and software design using C#, the work involved modifying the access modifiers of non-generic Option and Argument constructors from private protected to protected. This technical approach enabled subclassing of core CLI components, allowing downstream users to implement advanced customization and plugin-style extensions without altering existing behavior. The changes were carefully scoped to preserve maintainability while unlocking new usage scenarios, supporting future enhancements and more flexible instantiation patterns for command-line parsing within the .NET ecosystem.