Résumé : This paper demonstrates how agency emerges as teaching team members of three SSH MOOCs reflexively discuss the affordances and limitations offered by edX. Special attention goes to the entanglement of forums with(in) their courses. The authors approach the edX platform as a discursive material knot, a dispositif that can be partially configured by teaching team members. The interviewees interpretively articulate institutional pressures, technological characteristics of edX, perceived learner behavior behaviors, and pedagogic theories and preferences constitutive of their MOOCs. The authors identify six forms of agency: catalyst, surveillance-based; expertise-oriented; socializing; guiding; and humanizing. They argue and demonstrate that agency emerges as the result of complex and interpretive articulations of material and discursive elements.