Mismatched ARTF Envelopes Silently Mislead Auction Agents Despite Clean Parsing

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The IAB Tech Lab's Agentic Real Time Framework (ARTF) places a containerized agent alongside ad exchange components, using a structured envelope that specifies the auction lifecycle stage and the relevant OpenRTB object. A common production error occurs when a bid_response from a prior auction hop is left on an envelope labeled LIFECYCLE_PUBLISHER_BID_REQUEST, a stage at which no DSP should have yet responded. Although gRPC accepts the malformed bytes without error, the agent receives a distorted view of its position in the auction, potentially acting on data that does not belong at that stage. The open-source linter RTBlint flags this as artf.lifecycle.payload_unexpected and catches the inverse case — a response-stage envelope missing a bid_response — as artf.lifecycle.payload_mismatch, which can block bid-shading logic. Both issues typically stem from teams reusing a single JSON blob across auction hops without stripping stage-inappropriate fields before forwarding.

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