About URL schemes in Shortcuts
You can use URL schemes in Shortcuts. A URL scheme is the part of a link that specifies the type of application your device uses to open a URL. Many apps support URL schemes: FaceTime uses URL schemes to place calls when a URL starting with facetime:// is opened, just like Safari handles URLs starting with http://.
Shortcut’s URL scheme, shortcuts://, launches the Shortcuts app from a link to perform a task, such as importing or running a shortcut. These links can be useful in many different contexts, such as on the web, or when using Shortcuts with other apps that support opening URLs, such as Launcher or Launch Center Pro.
You can also open URLs using schemes inside of your shortcuts provided by other apps. To do so, use the Open URL or Open X-Callback URL action.