The FIPA Methodology Technical Committee has proposed a method engineering approach for multi-agent systems development. This approach consists on defining method fragments from agent-oriented software engineering methodologies. Developers combine fragments to define a customized development process. In this line of research, the contribution of this paper is a set of method fragments that are assisted by model transformations, in order to allow engineers to better develop multi-agent systems in an automated way. This set of method fragments is grounded on the experience the development process of two multi-agent systems. This paper presents the formalization of the fragments and an example of the automation of a fragment with a model transformation.