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An ARTF request can be valid JSON and still present a misleading auction state: its lifecycle says LIFECYCLE_PUBLISHER_BID_REQUEST, but it also carries a bid_response from a later point in the auction. The agent may then reason from data that does not belong at the stage the host says it is handling. Aleksander Sekowski, maintainer of RTBlint, describes this as a lifecycle/payload mismatch and reports that the linter flags it; this is RTBlint behavior, not an independently established IAB rule.
Why the lifecycle and payload can disagree
ARTF—the Agentic Real-Time Framework—is an IAB Tech Lab framework for agent services operating within a host platform. A platform can call an extension point, provide an RTBRequest, receive proposed bidstream mutations, and decide whether to apply them. The framework is intended for services such as identity resolution, deal or segmentation activation, and fraud detection. The host remains responsible for supervising the changes.
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The v1.0 request schema includes a required lifecycle, a required bid_request, an optional bid_response, and a tmax budget in milliseconds. Optional means the schema allows the field to be absent; it does not by itself define which lifecycle stages should include it. See the IAB Tech Lab ARTF overview and the ARTF v1.0 specification. The specification was released November 12, 2025; the linked final PDF says its name was updated in March 2026.
What happens when a publisher-stage request carries a response
LIFECYCLE_PUBLISHER_BID_REQUEST identifies a publisher-stage request headed toward buyers. If the envelope also includes a bid_response retained from a later auction hop, the lifecycle describes one point in the flow while the payload suggests another. An agent that trusts both may infer that a buyer has already responded, even though the host intends the agent to act before that response.
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This is a semantic disagreement, not necessarily a parsing or transport failure. The gRPC call can succeed while the agent’s picture of its position in the auction is wrong. A host might intentionally include previous auction context, so the field’s presence is not universally invalid; the important question is whether that context matches the contract for this lifecycle and the agent’s intended work.
What RTBlint reports for the mismatch
Sekowski’s September 18, 2026 article describes two RTBlint rules. These are the maintainer’s account of that validator’s behavior, not official IAB lifecycle requirements or a claim about every ARTF validator.
| Lifecycle and payload condition | RTBlint identifier | Reported significance |
|---|---|---|
Publisher bid-request lifecycle includes bid_response |
artf.lifecycle.payload_unexpected |
Warns that response data may be unexpected at this stage. It is a warning because a private host may deliberately provide prior context. |
DSP response-stage lifecycle omits bid_response |
artf.lifecycle.payload_mismatch |
Flags a missing payload that response-stage mutations may need. For example, a bid-shading path may have no response bid to reference. |
The inverse case matters for the same reason as the publisher-stage case: an agent cannot safely act on an OpenRTB object the host did not provide. Whether either condition is an error for a particular deployment depends on its lifecycle contract and accepted intents.
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A common source of this class of mismatch is reusing a logged, full-auction JSON object as the request fixture for multiple hops. Instead, treat each lifecycle as a distinct input contract.
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- Build one fixture per lifecycle. Do not copy a completed auction envelope into an earlier-stage test without removing objects that belong to later stages.
- Check the lifecycle and OpenRTB objects together. For each fixture, verify the lifecycle value and whether
bid_requestandbid_responseare present. Decide explicitly when prior response context is intentional. - Check the accepted intents. Confirm which intents the host allows at that stage, rather than assuming an intent applies everywhere in the auction.
- Validate mutation targets against the delivered payload. A mutation path must resolve against the objects actually supplied to the agent, not against data from another hop or a fuller log record.
- Run lifecycle-specific validation before applying mutations. Use the relevant validator and inspect its findings as checks against your host contract. RTBlint’s reported rules can help identify these mismatches, but their semantics should not be presented as an IAB mandate.
Keep ARTF’s tmax separate from OpenRTB timeout data
The ARTF envelope’s tmax is the exchange’s time budget, in milliseconds, for receiving mutations, including latency. The v1.0 specification describes it as: “Maximum time in milliseconds the exchange allows for mutations to be received including internet latency to avoid timeout.” It is not interchangeable with a timeout copied from the OpenRTB bid request; they describe different budgets at different layers.
Sekowski also reports that RTBlint warns when the envelope budget exceeds 1000 ms. That threshold is implementation-specific, not established by the IAB specification. The specification supports the millisecond-budget meaning, but the sources do not establish how often this lifecycle/payload mismatch occurs.
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What the framework’s speed claim does—and does not—mean
IAB Tech Lab said ARTF v1.0 was designed to reduce the time for bid requests and responses “up to 80%.” That is a framework design claim, not a measured frequency or impact estimate for stale bid_response fields. It should not be used to quantify this particular mismatch. The overview was last updated February 18, 2026.
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