1. A server computer, comprising: a processing unit; and memory coupled to the processing unit; the server computer configured to perform operations for updating language understanding classifier models, the operations comprising: receiving from at least one computing device of a plurality of computing devices communicatively coupled to the server computer, a first user selection of at least one of the following: at least one intent of a plurality of available intents and/or at least one slot for the at least one intent, wherein: the at least one intent is associated with at least one action used to perform at least one function of a category of functions for a domain; the at least one slot indicating a value used for performing the at least one action; and the first user selection associated with a digital voice input received at the at least one computing device; and upon receiving from at least another computing device of the plurality of computing devices, a plurality of subsequent user selections that are identical to the first user selection and a plurality of subsequent digital voice inputs corresponding to the plurality of subsequent user selections, wherein the plurality of subsequent digital voice inputs are substantially similar to the digital voice input: generating a labeled data set by pairing the digital voice input with the first user selection; selecting a language understanding classifier from a plurality of available language understanding classifiers associated with one or more agent definitions, the selecting based at least on the at least one intent; and updating the selected language understanding classifier based on the generated labeled data set.