This repository contains a CLI tool for interacting with SoloKeys Solo 2 security keys. The application enables users to list connected devices, interact with various onboard applications (Admin, FIDO2, NDEF, OATH, PIV, Provision, QA), update firmware, and switch between regular and bootloader modes. The architecture features a clean separation of concerns with distinct layers for CLI parsing, library functionality, transport abstraction (CTAP/PCSC), device management, and application-specific implementations. The code demonstrates solid Rust engineering practices with proper error handling, user experience considerations, and adherence to security best practices.