Worked on the SagerNet/gvisor repository to enhance the command-line interface by improving the user experience around root directory configuration. Updated the --root flag help message to display its default value and the relevant environment variable, making configuration more transparent for users. Refactored the codebase to introduce constants for DEFAULT_ROOT and XDG_RUNTIME_DIR, which improved code readability and maintainability. Focused on configuration management and command-line interface design using Go, the changes aimed to reduce configuration errors and streamline deployment processes. No bugs were fixed during this period, with efforts concentrated on delivering this targeted feature and refining the configuration workflow.