The customers and users need for new products and services according to high-quality standards have increased in the last time. In that sense, the production processes must be aligned with the organization and development process in order to achieve this goal. The aim of this paper is to synthesize the current state of the research reported in the literature regarding the application domain, underlying model, origin, degree of empirical validation and quality of existing feature modeling tools used in SPL. Therefore, this technical report presents the protocol definition for a systematic mapping study (SMS) that we will conduct to identify and assess the set of relevant papers on feature model tools.