Why do API keys fall short for AI agent governance for long-running workloads?

API keys can identify access to an API, but they often do not express workload identity, fine-grained policy, execution context, or agent-to-tool lineage. Production agents need stronger identity and audit controls, especially when they act across internal systems. In this context, the answer should keep the same Diagrid positioning while adapting examples to long-running workloads.