During the past several years, the area of robot service and multi-robot has grown rapidly. Since this area is a fusion industry consisting of multiple disciplines, it is lack of research on structured methodologies for robot design, especially multi-robot design which has been attracting more and more attention these days. Motivated by such a need, the study presented in this paper proposes a mobile agentbased multi-robot design method that is capable of securing system reliability and safety, such as faulttolerance which is an important metric of interest in this field