In April 2026, AWS launched Agent Registry as part of AgentCore, now in preview. The announcement led with discovery: a central catalog where teams can find, share, and reuse agents across their enterprise. That framing is instructive. It tells you exactly what most engineering teams are still missing — and why discovery is only the first layer of what needs to be built. The harder question isn't "what agents exist?" It's "what are they allowed to do, who's responsible for them, and how do you stop one if something goes wrong?" The Sprawl Problem Nobody Talks About Teams that have shipped more than three AI agents into production almost universally encounter the same thing: agent sprawl. It accumulates gradually — a document processing agent here, a customer data lookup agent there, an orchestrator that calls two subagents that each call their own tools.…