Trust between the participants of a group action is a presupposition of smooth coordination. We study whether robots could participate in joint action, and whether there is conceptual space for robots to figure as trustworthy cooperators in light of various philosophical trust accounts. We discuss different notions of joint action and group action and locate robots into the scale of such notions of varying strength. We suggest that when we use trust notions of normative strength in the context of AI or robotics, the normative component of such talk boils down to talk of responsible robotics or AI on the human side, the reliance, while reliability or predictability component of such trust notion applies to machines and algorithms as well.