For the last twenty years, cybersecurity has been built around the edge: the belief that threats come from the outside, and that firewalls, WAFs, and API gateways can inspect and control what enters the environment. That model worked when applications were centralized, traffic was predictable, and most interactions followed a clear pattern: a user in a browser talking to an app inside a data center. Today, AI systems don’t just generate responses — they take action. Agents trigger workflows, call APIs, update records, fan out across services, and interact autonomously with internal systems and third-party SaaS. That shift moves the risk inside the API ecosystem, where perimeter-based tools have limited visibility. Legacy perimeter tools were designed for a world with simple assumptions:

1. Users sit at the “edge”
2. Apps sit inside a defensible perimeter
3. Traffic is predictable
4. Lateral movement is limited and observable

Full analysis : Why Agentic AI Moves the Cyber Security Risk Inside Your APIs.