This eBook is a comprehensive guide that explores the evolving landscape of identity and authorization in the context of AI agents. It addresses the challenges organizations face as they transition from traditional identity and access management (IAM) systems designed for human users to those that accommodate the rapid, machine-speed operations of AI agents. The document outlines key concepts such as the new identity frontier, authorization drift, and cross-system trust, emphasizing the need for automated, policy-driven security measures. Recommendations include implementing ephemeral credentials, relationship-based access control, and continuous evaluation of permissions to mitigate risks associated with unauthorized actions. The eBook also discusses the implications of AI agents in cyber-physical environments, highlighting the necessity for end-to-end traceability and real-time policy enforcement. By treating AI agents as distinct identities and unifying identity and authorization decisions, organizations can establish a framework for autonomous trust, ensuring secure and efficient operations in an increasingly automated world.