Abstract Proposal: As enterprise cloud infrastructure transitions from chatbots to agentic AI, the security perimeter has to change. And the architectural shift moves the focus from text filtering to system boundary governance. In this session, we will walk through a conceptual AI interaction chain to show how inputs and system instructions move from the orchestrator down to tool boundaries where data crosses into execution zones. The delivery focuses upon core architecture concepts including multi-agent topologies, boundary containment, privilege isolation, and auditing strategies to help enterprises deploy agentic AI safely.