VOICE ACTION BIASING SYSTEM

Methods, systems, and apparatus for determining that a software application installed on a user device is compatible with a new voice action, wherein the new voice action is specified by an application developer of the software application. A user utterance for a new voice action is received in a voice action system that is separate from and communicatively coupled to a user device, the user device having an application installed which is associated with trigger terms for performing voice actions. The voice action system determines multiple candidate transcriptions of the user utterance, and determines whether any of the multiple candidate transcriptions contains one or more of the trigger terms. The voice action system is biased based on the determination, such that the voice action system favors one of the multiple candidate transcriptions that is associated with the new voice action. Upon the voice action system receiving the user utterance from the user device, the voice action system sends an action trigger to the user device, the action trigger causing the application to perform the new voice action.