AI agents capable of autonomous transactions raise a traceability issue: a user can ask an agent to find an item without buying it, but the agent still places the order, leaving no evidence chain linking the action to the original instruction. The AI AGENT Act bill, introduced in the U.S. Senate on July 21, 2026 by Senator Mark Warner, seeks to define custodial user agents and require real-time record-keeping, but does not mandate a verifiable evidence chain across the different systems involved. A functional verification system would require five elements: a verifiable binding among the user account, the agent and the task; task-specific limits; verifiable linkage across the transaction; a check before each action; and tamper-evident records. Google’s AP2 protocol meets some of these requirements but does not determine who bears the loss or specify how long evidence must be retained.
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