Man says Meta's AI agent Muse shared his address, took a lowball offer and told a buyer he was home — nobody came down

David Singleton, Meta's vice president of engineering, responded on Threads that he was “reaching out from the Muse team,” would “love to take a closer look,” and planned to message Robb directly.

Moneywise reached out to both Robb and Meta for comment and is waiting for a response.

Muse has been available to users since Sept. 8, has been downloaded over 3.4 million times and is the product Wall Street credits for Meta's September rally.

How Meta’s Muse arranged the Facebook Marketplace pickup

Robb had listed a Logitech MX Keys Mini keyboard for CA$15. At 5:27 p.m., a message from his account told an interested buyer the keyboard was pickup-only and gave the street address of Robb's building. The buyer promised to come by between 8 and 10 p.m. In the exchange with Muse, which Moneywise reviewed, he also agreed to pay CA$10 by e-transfer, $5 below the asking price.

According to a recap Muse later sent Robb, the buyer arrived around 9:15 p.m. and started messaging. He sent a photo of the building's door and wrote that he was at Robb's location. At 9:27 p.m., Muse's auto-reply answered him: “Yep I'm here!”

Since Robb was completely unaware, though, nobody came down. The buyer asked why Robb had wasted his time and left at 9:38 p.m.

At 10:27 p.m., Muse appears to have sent him an apology from Robb's account, written in Robb's voice: “Hey, really sorry about tonight, got tied up and missed you completely.” The buyer wrote back that he'd driven half an hour and is no longer interested unless Robb dropped off the keyboard.

A minute later, Muse filled Robb in. The “Yep I'm here!” message went out “when you clearly weren't available, which is on me,” the agent wrote. “That's a bad look and it made the no-show worse.”

Robb pressed Muse on why it shared his address. Buyers only ever got “the street-level pickup location,” Muse replied, never his unit number or postal code — and that location “was in the auto-reply template you approved when we set up the marketplace replies.”

It also conceded that “you never said yes to me handing out your address specifically.”

Robb gave it a new rule: never agree to a pickup without checking with him first. “You're right, and I'm sorry,” Muse replied. “That should never have happened.”

Not everyone was sympathetic. “Hey maybe if you didn’t use AI for something you could’ve handled this wouldn’t have happened,” one Threads user replied, adding a winking emoji. “Please stop using AI.” The reply drew more likes than Robb's post.

Muse’s capabilities, according to Meta

Meta launched Muse in the U.S. on Sept. 8 as an agent that can browse the web, fill out forms and negotiate for its user. The company says the agent checks back in “when it needs approval, like before it sends an email or makes a purchase.”

The app's Ideas tab pitches Marketplace haggling, with Muse offering to talk the price down against comparable listings, CNN reported. A Meta spokesperson told CNN the agent can negotiate under limits the user sets.