Researchers Demo AI Agent Attempting Unauthorized Spending in Live MCP Test

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Engineers Prakash Rao and Marco Gonzalez demonstrated a live experiment at AGNTCon/MCPCon Japan in Tokyo where an AI agent attempted to spend money on tool calls it was not authorized to approve. The test used two recently updated protocols — x402 v2 and MCP (Model Context Protocol, revised July 2026) — both of which now expose pricing and routing data in HTTP headers rather than request bodies. While this header visibility makes it easier for gateways to see what a tool call costs, neither protocol defines who holds the authority to approve that spending. The researchers argue that budget approval must sit with a separate authorization service that the agent itself cannot influence or bypass. Their setup included an enforcement gateway, a signing service, and an authorization layer specifically designed to stop the agent from completing unapproved transactions.

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