Agent Identity Is Not Agent Authorization: What Entra Agent ID Still Leaves to Runtime Policy

While Microsoft Entra Agent ID establishes cryptographic identity for AI agents through registration and governance, it does not determine whether specific tool invocations are permissible at runtime. The article explains that authorization requires a separate enforcement layer - an MCP gateway that evaluates contextual factors like human delegation scope, stated intent, resource sensitivity, and risk signals before allowing tool execution. This distinction between identity verification and action-time policy decisions is critical for securing autonomous agent behavior at enterprise scale.