According to the hypothesis of Extended Mind, the constitutive basis of certain cognitive capacities is not restricted inside the bodily boundaries, but it can extend to include devices and tools. So far, research has focused on “traditional” tools, such as notebooks or pen and paper. However, instead of “basic extenders”, I will focus on externalisations based on AI technology. Following Hernández-Orallo & Vold (2019), I call them AI-extenders – cognitive extenders that use AI technology and that are tightly coupled with the human agent so that a hybrid system is created. I will examine how an AI-extender might be relevant for moral agency and responsibility by going through examples where they either enhance or reduce their user’s moral agency.