The focus of this paper are actions in which agents employ instruments in order to achieve desired outcomes. I explore the ontological structure of such actions and the semantic features of the sentences by means of which we refer to these actions. The logical framework for this philosophical enterprise is the theory of the so-called stit operator: ...see to it that .... I modify the original formulation in such a way that we could represent those events in which agents see to things with the help of physical objects. As a result, I obtain a formal theory of the operator of instrumental stit: . . . see to it that ...with the help of .... Keywords. logic of agency