MacosUseSDK is a Swift library and collection of command-line tools for macOS accessibility automation. It enables traversing application accessibility trees to inspect UI elements, simulating user input (mouse/keyboard), opening applications, and providing visual feedback for debugging. The architecture centers around a core library with specialized modules for traversal, input simulation, visual feedback, and action orchestration, with six CLI tools exposing different subsets of functionality. Primary use cases include UI testing, accessibility verification, and automated interaction with macOS applications.