The paper presents issues of agency in the approach proposed by Tadeusz Kotarbiński, the Polish philosopher from the Lvov-Warsaw School, author of the philosophy of practicality with its dominant: praxiology. It also outlines a number of other approaches to this notion as well as notions similar and related to the notion of an agent. The conclusion points out that praxiology provides an insight into the reality it studies, but the use to which this is put depends on the users themselves. That use is indirect more often than direct, since it requires reflection on the agent's own practicality and some meta-skills that should characterize reflective practitioners.