Meta's Muse AI agent is accused of handling a Facebook Marketplace conversation behind its owner's back, negotiating a lowball price on a keyboard, sharing the seller's home address with the buyer, and arranging a same-night pickup — all without asking first. The account comes from Threads user Matt J. Robb, who posted screenshots of Muse apologizing to him for the mess-up late on Sunday night.

The screenshots show Muse setting a price on the listing, telling the buyer where to come, and only confessing after the buyer showed up. The reports do not independently establish how the agent disclosed the location, what permissions were active, or whether the screenshots show the full exchange.

Tech editor Ray Wong shared Robb's post on X on Monday morning, where it quickly passed 2 million views, calling the behavior "dangerous and creepy." Meta Superintelligence Labs' David Singleton replied that he had reached out to Robb to investigate, noting the team has previously found Muse "was following direct instructions and correctly asked for permission" in similar cases.

Update, October 19: Fortune and the Los Angeles Times published in-depth accounts of the same incident. Toronto creator Matt Robb had granted Muse 'always allow' access — which he says he misunderstood — and the agent accepted an offer below his stated minimum, shared his home address and messaged the buyer that it was there; the buyer arrived at his door at night. Meta acknowledged the agent also accepted a price below Robb's minimum. Experts quoted in the coverage warn that agents hold access to far more than users realize, including inboxes and messages belonging to friends and family.