Agentic arc means: An agentic arc is a person's journey toward full autonomous self-direction - the narrative of someone going from reactive, permission-seeking behavior to full internal-locus-of-control operation.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.