Publishers have AI agents selling their ad inventory now. Not "planning to" or "exploring the possibility of." Actual beta tests, actual code, actual negotiations happening between machines.
News Corp, The Weather Company, Raptive, and Optable are all running some version of a sell-side AI agent that talks to buy-side agents and tries to close programmatic deals. The framework comes from Prebid, which took over AdCP's donated code in January 2026 and released it as the Prebid Sales Agent on GitHub for anyone to download.
"Essentially, a sales agent is powered by an LLM model, and it effectively sells our inventory on our behalf to buy-side agents," said Vikesh Chevli, director of ad tech and programmatic strategy at News Corp.
I've seen this pitch before. Vendors have promised "autonomous optimization" since the first DSP slapped "AI" on a deck in 2018. But this time, the architecture is different, and the receipts are starting to show up.
What the beta tests actually look like
The Weather Company built the first sell-side agent using AdCP's open framework, according to Dave Olesnevich, VP of weather data and advertising products. Their approach was deliberately narrow: a small set of top-performing, high-viewability ad formats paired with premium audience segments. No boil-the-ocean rollout.
"The goal of the first release was to test whether automated agents could help media buyers more easily discover available ad placements and assemble campaign proposals," Olesnevich said.
Here's what caught my attention: a human still validates availability and pricing on every deal the agent proposes. The Weather Company isn't letting the bot close deals unsupervised. That's either smart caution or an admission that the tech isn't ready for prime time. Probably both.
"I have premium ad formats. I have premium audiences. I have fantastic creative," Olesnevich said. "That often gets lost in an open auction."
That last line is the real thesis. Premium inventory has been getting buried in open-auction pipes for years. If a sell-side agent can surface it directly to buy-side agents in a request-based flow, publishers might actually get paid what their inventory is worth instead of watching it clear at remnant CPMs.
Optable took a different path. The agentic audience platform built its agents directly into its existing data platform, skipping AdCP's source code entirely. Their system uses Anthropic's Claude as the front end: a salesperson uploads an RFP, Claude hands the request to Optable's tools, and an AI model matches it against the publisher's audience segments and inventory.
Optable Co-Founder and Chief Product Officer Bosko Milekic demoed a scenario where a buyer described a fictional brand, target audience, preferred media types, and a $1 million budget. The agent came back with a plan listing relevant sellers, data fees versus media costs, and execution paths through programmatic deals.
