This paper presents an account of how children's sense of agency is produced in machinic assemblages. The ethnographic data used in this study originated in one elementary school classroom. By utilising children's own expressions of their agency and by examining the machinic assemblages in which these expressions were produced, we demonstrate that school policies are not merely a background for schools' mundane practices. Rather, when combined with other elements in a school setting, policies have heterogeneous consequences for children's sense of agency.