Google posts direct download links to adb and fastboot tools for faster sideloading, flashing
The pre-requisite step in any guide to sideloading an OTA or flashing a factory image is installing the Android Device Bridge. Previously, the official way to get adb or fastboot was by downloading the entire set of Android Studio development tools. Google (spotted via Android Police) now conveniently provides a direct way to just download the platform-tools.