But "teammate" is a stretch. The failure mode is different from a human -- a person will tell you "I don't know how to do this," an agent will confidently do it

But "teammate" is a stretch. The failure mode is different from a human -- a person will tell you "I don't know how to do this," an agent will confidently do it wrong and you won't notice until something breaks in production. The supervision cost doesn't go away, it just changes shape.