AspectM, a UML-based aspect-oriented modeling (AOM) language, provides not only basic modeling constructs but also an extension mechanism called metamodel access protocol (MMAP) that allows a modeler to extend the AspectM metamodel. MMAP enables a modeler to construct domain-specific AOM languages at relatively low cost. In this paper, we show the overview of an AspectM support tool consisting of a reflective model editor and a verifying model weaver.