Magisk is a suite of open-source tools for customizing Android devices, providing systemless root access (MagiskSU), a module framework, boot image patching (MagiskBoot), init process hijacking (MagiskInit), SELinux policy modification (MagiskPolicy), and Zygisk (code injection into the Zygote process). The system is composed of a native daemon (magiskd) written in Rust and C++ that communicates with an Android management app (Magisk Manager) via Unix sockets. The app is built with Kotlin and Jetpack Compose (modern UI) alongside a legacy XML/DataBinding variant, and includes a stub APK mechanism for hiding the app from detection. Key entry points include the native binaries (magisk, magiskinit, magiskboot, magiskpolicy, resetprop, su) and the Android app's MainActivity and SuRequestActivity. The build system is Gradle with custom plugins, orchestrating compilation of Rust, C++, and Kotlin components. Data flows involve the app fetching module updates from GitHub repositories, downloading and installing modules, managing superuser policies stored in a SQLite database (magisk.db), and logging su requests. The daemon handles root requests, module mounting, denylist enforcement, and Zygisk module loading. External dependencies include the Android SDK, NDK, Rust toolchain, and libraries such as Retrofit, OkHttp, Room, Moshi, Wire, and libsu. The codebase demonstrates high craftsmanship with elegant architecture, reusable components (e.g., a standalone CLI argument parsing proc-macro, a full terminal emulator, a download engine), and non-obvious engineering solutions for low-level system manipulation. However, it carries maintenance risks due to its multi-language complexity, reliance on Android internals, and dual UI codebase.