The Nnd tool is an alternative text user interface (TUI) debugger designed to improve user experience compared to traditional debuggers like GDB and LLDB. It emphasizes efficiency in operations that are not instantaneous, ensuring these tasks such as loading debug information and searching for functions are multi-threaded, asynchronous, cancellable, and feature progress bars for better user feedback. The concept of integrating progress indicators is noted as a desirable feature that should be more widespread in debugging tools.