Marketers establish guardrails as AI agents reshape programmatic buying
Marketers are deploying AI agents to automate campaign creation, optimize ad buys and draft pitch decks. They're also installing strict controls to prevent those same agents from making costly mistakes.
The hesitation stems from real risks. An AI hallucination-a wrong CPM or misinterpreted targeting parameter-could drain a quarter's budget in days, leaving the agency responsible, not the machine. Henry Webster, senior vice president and director of analytics at Kelly Scott Madison Media, said the concern is justified: "Would it blow a quarter's worth of budget in a weekend? All of that's well-founded, so that's a fear."
Webster spoke at Digiday's Programmatic Marketing Summit in May, where marketers discussed how they're moving cautiously. "The process of taking baby steps, testing, putting stringent guardrails and checks on agents that would operate in that way-makes a ton of sense," he said.
How guardrails work in practice
Kelly Scott Madison built an internal agent called "the librarian" that acts as a gatekeeper for brand voice. Other agents request client-specific acronyms and campaign names from it, ensuring precision in context and targeting.
Bayer, a pharmaceutical company, imposed spend caps to prevent bots from over-relying on legacy data partners. This protects budget allocation for testing with new partners. Glenniss Richards, senior director of digital media activation at Bayer, said the company also enforces guardrails around data anonymization before any activations run.
"We do put guardrails from a spending perspective to ensure it doesn't conflict with our decisioning or how we want the campaigns to perform," Richards said.
The transparency problem
Programmatic buying was already opaque. Marketers relied on industry standards, pre-bid measures and content categories to guard against fraud and waste. Generative AI and LLM systems add another layer of obscurity-their decision-making processes aren't easily auditable.
In May, the IAB Tech Lab launched the Programmatic Governance Council to establish workflows and transparency standards. Initial participants include WPP, Disney, Magnite, Yahoo, Amazon Ads and The Trade Desk.
At the summit's town hall sessions, one attendee raised a core concern: "It will reinterpret your intent over time and start to break out of those guardrails because it thinks it knows better based off of an accumulation of data."
Marketers lack visibility into how agents make decisions. Until industry standards emerge, skepticism will persist. Richards summed up the position most agencies are taking: "I want a person overseeing the bot. We do need some guardrails in place to ensure that we are still able to test and learn and scale new opportunities."
Humans remain at the wheel. For now, that's not changing.
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