We present in this paper the COSTO toolbox that supports the Kmelia abstract component model. First, an overview of the COSTO toolbox is given. Then the abstract component model Kmelia is presented. One main feature of the toolbox is the connection with existing tools in order to perform the analysis of specification properties. We present this approach for the dynamic aspect analysis; an example of the connection with the CADP toolbox to check Kmelia service behavioural compatibility is used as an illustration.