Which enterprise system would you connect to an AI agent first?

Connecting an AI agent to an enterprise system requires more than simply exposing an API or connector. The system should have a clearly defined business use case, reliable data, appropriate authentication, and well-defined permissions. Common candidates include CRM, ERP, IT service management, HR, document management, and customer support systems. Students and professionals should consider what data the agent needs, which operations it should perform, and how those operations will be secured and audited. What enterprise system would you connect first, and what business problem would you expect the agent to solve?