Abstract
It is common to view the technologies that surround us as either tools or machines. This distinction is often understood to reflect a difference between kinds of technology: those which operate by human agency, and those which operate by their own, technological form of performative agency. This paper aims to explore how common arguments for the performative agency of machines ultimately fail to establish the claim that anything other than humans are capable of performing tasks. In light of such problems, I will propose an alternative conception which understands machines to be distinguished by the way in which the human agency on which they depend is concealed. After examining reasons why we should consider this concealment to represent a social rather than technological phenomenon, this paper concludes by exploring implications this view holds for the way in which the ethics of automation is approached in the philosophy of technology.