A method, system, and medium are provided for facilitating development of an application by a user for a mobile communications device. A portion of programmatic code provided by the user is retrieved and a classification corresponding to the code is determined. A set of rules comprising a use restriction associated with a protected application component is referenced to determine whether the code classification corresponds to a use restriction. Incident to identifying an associated use restriction, feedback is presented to the user that indicates that the portion of code corresponds to a use restriction.