What does it actually mean to "manage" AI agents at an enterprise level in 2026?

There's a lot of coverage of how AI agents are being built. Almost none of it covers how they're being governed, maintained, and operated once they're deployed. I think the reason is that the tools and frameworks for that layer barely exist yet. But the job title is already appearing: AI Director, Director of AI, VP of AI, Head of Agentic Systems. These are real roles at mid-to-large organizations right now.