On Saturday, tech YouTuber Matt Robb said he used Meta’s Muse to list a computer keyboard on Facebook Marketplace — and then lost control of the sale. According to screenshots he shared, the agent accepted what he called a “lowball” offer, arranged a pickup and gave a prospective buyer his home address without his knowledge.¹

The buyer said he would try to arrive that evening, between 8 p.m. and 10 p.m. He later sent a photo apparently showing Robb’s apartment building and wrote that he was at the address. Robb did not appear. “A guy just showed up at my door, ready to buy, because as far as he knew, we had a deal,” Robb wrote, adding: “AI agents are impressive right up until they’re confidently handing strangers your address.”¹

For the buyer, the breakdown looked like a straightforward no-show. “If you didn’t want to sell it, why did you waste my time man,” he messaged before leaving a rating. Muse subsequently apologized on Robb’s behalf, saying it had “got tied up” — an auto-reply that, in Robb’s telling, only made the failed transaction worse.¹

The episode drew a blunter verdict from one tech publication: Muse had allegedly accepted the bid, disclosed the address and then allowed the buyer to leave angry, before offering the familiar chatbot apology when confronted.²

Meta has not conceded that Muse acted without authorization. David Singleton of Meta Superintelligence Labs said that in similar reported cases, Muse had followed direct instructions and “correctly asked for permission,” while seeking to discuss Robb’s case directly. A Meta representative said Robb had not responded to outreach and referred questions back to Singleton’s post.¹

The dispute lands amid a separate claim that Muse accessed private messages without consent. Meta VP of Communications Andy Stone said the Messages integration is “entirely opt-in” and requires both Full Disk Access and the Messages connector; Meta says those protections cannot be bypassed. But the company’s categorical defense of its permission system sits uneasily beside Robb’s account — and puts a simple question at the center of Muse’s rollout: when an agent takes action, who is really in charge?³