The Stoics already had two words for this

The Stoics split the mind into faculties, and two of them map onto a distinction agentic systems engineering has been quietly rediscovering under new names. Prohairesis is the faculty of choice, the deliberate response to circumstances you did not choose and cannot control. Hegemonikon is the governing faculty, the part that coordinates everything else without performing any of it directly.

An AI agent acting on a task is doing something close to prohairesis: given inputs it did not choose, it deliberates and responds. The oversight layer sitting above it, the human, or the process, that can review, pause, or override that response before it takes effect, is doing something close to hegemonikon: it governs the faculty that acts without acting itself.

This is not a claim that the Stoics anticipated AI governance. They did not, and pretending otherwise would cheapen both the philosophy and the argument. What is genuinely old is the structural shape: a faculty that acts and a faculty that governs and can override are not two competing designs for the same job. They are two different jobs, and conflating them, giving the acting faculty the authority to also be its own oversight, is exactly the design mistake human-on-the-loop governance exists to prevent.

The names changed. Prohairesis became "agent." Hegemonikon became "governance layer," "human-on-the-loop," "the escalation path." The distinction underneath them did not need inventing. It needed noticing.