Since everything can fit into the “agent with utility function” model given a sufficiently crumpled utility function, I guess I’d define “is an agent” as “goal-directed planning is useful for explaining a large enough part of its behavior.” This includes humans while discluding bacteria. (Hmm unless, like me, one knows so little about bacteria that it’s better to just model them as weak agents. Puzzling.)
Since everything can fit into the “agent with utility function” model given a sufficiently crumpled utility function, I guess I’d define “is an agent” as “goal-directed planning is useful for explaining a large enough part of its behavior.” This includes humans while discluding bacteria. (Hmm unless, like me, one knows so little about bacteria that it’s better to just model them as weak agents. Puzzling.)