AI agentic systems face a critical 'last mile' identity problem: while user identity is known at the front end, it gets lost by the time requests reach legacy backend systems that rely on shared API keys or static credentials. This breaks Zero Trust principles, loses context and delegation information, and opens the door to rogue agents chaining tools without authorization. The proposed solutions include implementing ABAC/PBAC policies on backend systems, introducing a vault as an abstraction layer to validate identity, context, and delegation while issuing short-lived credentials, and collecting telemetry to continuously refine and restrict permissions.
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