While AI agents and AI identities represent a fundamentally new category of digital identity, the core principles of identity security remain consistent. The differences—and they are critical—lie in the nuanced ways these principles must be applied. Understanding and addressing these nuances is essential for building resilience into the lifecycle of AI identities. This chapter explains how proven identity governance fundamentals can and should be adapted to effectively manage the unique lifecycle challenges posed by AI agents, ensuring long-term security, reliability, and operational stability.