I would call it obedience, and it's not the same as friendliness.
The difference, in a repeated prisoner dilemma: Friendliness is cooperating on the first move, and then conditionally. Obedience is always cooperating.
Agreeableness is a Big Five personality trait so a lot of the formal research into personalities uses it as one of the dimensions.
Agreeableness is a Big Five personality trait so a lot of the formal research into personalities uses it as one of the dimensions.