Implementations relate to generating and/or executing a customized interactive dialog application. The customized interactive dialog application may be generated from a state mapping tool that allows a user to generate custom states and custom transitions between the custom states. A customized configuration description is then generated based on the generated custom states and custom transitions. Further, a default configuration description is identified that includes additional or alternative states and transitions. In executing the customized interactive dialog application, dialog turns are generated based on the states and transition information, with the customized configuration description taking precedence and the default configuration description being utilized for any undefined states and/or transitions. Implementations additionally or alternatively relate to generating and/or executing a custom agent based on generated custom states and custom transitions, and a default configuration description.