Who's the agent?
I strongly disagree that having agency requires responsibility or consciousness. In my understanding of agency, something has agency just because it is a part of the system and the “cause and effect” explanation of agency supports this. An object has agency if it produces an effect. Everything in a system has an effect on the system and this is why just being present gives an object agency.
Requiring conciousness or responsibility is extremely limiting and as Flora was saying in class creates a hierarchy which puts humans and other "living" things as top agents.