Triggering of user interface notifications can be managed for a plurality of computer applications via a digital assistant, which can include a notification triggering engine. The managing can include selecting a time to trigger a user interface notification from a computer application of the plurality of computer applications. The selecting can use the data representing a current contextual user interface activity computer state. The current contextual user interface activity state can be a state other than a state of the digital assistant, the triggering engine, or a state of the computer application. The technique can further include, in response to the selecting of the time, triggering the notification in the computer system at the selected time via the digital assistant. Further, the technique can include responding to the triggering of the notification by presenting the notification on a user interface device in the computer system.