1. A content discovery module to retrieve content in an automated fashion at a computing device, comprising executable instructions embodied in one or more non-transitory machine-readable media, configured to cause a computing system comprising one or more computing devices to: access a contextual user model, the contextual user model comprising: gaze-tracking data comprising one or more real-time sensor inputs indicative of user gaze in relation to on-screen locations of a display of the computing device; and semantic descriptions of user interface elements displayed at the on-screen locations corresponding to the gaze-tracking data, the semantic descriptions comprising information about the user interface elements; generate an inference relating to a user-specific current interaction context based on the contextual user model; formulate a search query including one or more aspects of the user-specific current interaction context; execute the search query across one or more software applications; and present one or more results of the search query at the computing device.