This tool paper presents : a methodology and a programming framework for computer-aided design of structural operational semantics for formal models. This framework includes a set of Scala libraries and a workflow to produce visual and interactive diagrams that animate and provide insights over the structure and the semantics of a given abstract model with operational rules. follows an approach in which theoretical foundations and a practical tool are built together, as an alternative to foundations-first design (“tool justifies theory”) or tool-first design (“foundations justify practice”). The advantage of is that the tool-under-development can immediately be used to automatically run numerous and sizeable examples in order to identify subtle mistakes, unexpected outcomes, and unforeseen limitations in the foundations-under-development, as early as possible.We share two success stories of methodology and framework in our own teaching and research context, where we analyse a simple while-language and a choreographic language, including their operational rules and the concurrent composition of such rules. We further discuss how others can include in their own analysis and Scala tools.