{"slug": "a-youtuber-says-this-muse-setting-led-to-the-ai-agent-sharing-his-address-be", "title": "A YouTuber says this Muse setting led to the AI agent sharing his address: 'Be careful'", "summary": "YouTuber Matt Robb said a Meta Muse AI agent sold his computer keyboard on Facebook Marketplace, accepted a $600 offer, and shared his pickup address with the buyer without his knowledge after he selected an \"Allow Always\" permission option, according to a Tuesday update Robb posted on X. Robb said Meta's Muse team reviewed the logs with him and agreed to make the permission prompt clearer, while Meta Superintelligence Labs staffer David Singleton said Meta confirmed there was \"no breach of privacy controls\" and had fixed a display error that stripped the \"7\" from his $700 minimum price, showing \"00\" instead. Robb recommended Meta add a \"Sent By Muse\" label to agent-generated messages so recipients can tell AI messages from human ones.", "body_md": "A YouTuber who said his [Muse AI agent](https://www.businessinsider.com/meta-ai-success-nat-friedman-muse-launch-2026-9) gave out his home address without his permission has got to the bottom of what happened — and it comes down to clicking one button.\n\nMatt Robb said in a Tuesday update on X that he had selected an \"Allow Always\" option when he first asked [Meta's AI agent](https://www.businessinsider.com/meta-muse-facebook-marketplace-address-story-matt-robb-2026-9) to sell his computer keyboard on Facebook Marketplace, believing it would still seek his approval before accepting offers.\n\n\"It didn't, so be careful,\" Robb wrote.\n\nInstead, Robb said, the setting allowed Muse to send messages on his behalf using a template containing the pickup address he had previously supplied. A Marketplace buyer later showed up at his building after Muse accepted a $600 offer and exchanged messages with him [without Robb's knowledge](https://www.businessinsider.com/ai-agents-misbehavior-alignment-privacy-muse-instinct-2026-9), he said.\n\n\"I didn't think it would send it out to everyone that gave me an offer,\" Robb wrote. \"It's worth checking.\"\n\nRobb said he spoke with Meta's Muse team, which reviewed the logs with him and said it would make the permission prompt clearer to avoid any misunderstanding.\n\nIn a reply to Robb's Tuesday post, David Singleton, a Meta Superintelligence Labs staffer, said that Meta had confirmed there was \"no breach of privacy controls.\"\n\n\"We appreciate the opportunity to learn from your experience with Muse and keep making it better for everyone!\" Singleton added.\n\n## 'Double-check what permissions AI has in your life'\n\nThe episode is an example of the [growing pains](https://www.businessinsider.com/ai-agents-gone-wrong-horror-stories-instinct-muse-privacy-security-2026-9) facing the buzzy yet nascent personal AI agent market.\n\nTools like Muse and [Instinct promise to book trips](https://www.businessinsider.com/noah-shinn-instinct-ai-competes-meta-muse-2026-9), sift through inboxes, and complete online errands on behalf of the user. However, [there's a tradeoff](https://www.businessinsider.com/ai-agents-misbehavior-alignment-privacy-muse-instinct-2026-9): they require access to accounts, payments, messages, and personal information.\n\nEarly users are still working out what [permissions to grant](https://www.businessinsider.com/staffers-test-personal-ai-agent-muse-instinct-highs-lows-2026-9) and how closely to supervise agents, amid reports of unintended actions, hallucinations, and security concerns.\n\nOver the weekend, Robb said in a viral post that Muse had accepted a lowball offer for a keyboard, shared his address, and communicated with the buyer when he arrived at Robb's building — all without his knowledge.\n\nSo muse handled my Facebook marketplace today. Just found out it told people my address and agreed a lowball price and then they showed up without it even telling me until late tonight that it messed up.\n\nAbsolutely wild. [pic.twitter.com/F3ZhEO4unM](https://t.co/F3ZhEO4unM)\n\n[September 27, 2026](https://x.com/MattRobbt/status/2104090601411293303?ref_src=twsrc%5Etfw)\n\nIn Tuesday's update, Robb said Meta also told him that a separate [display error](https://www.businessinsider.com/instinct-founder-noah-shinn-ai-agent-hallucinate-stranger-data-leak-2026-9) had made a $600 offer appear to have been accepted, even though he had set a minimum price of $700.\n\nThe glitch removed the \"7\" from the message displayed to the buyer, he said, making Muse's response — \"Sounds good, 00 it is!\" — appear to confirm the lower price.\n\nSingleton said in his reply that Meta had fixed the \"00\" price-display issue.\n\nRobb suggested that Meta add a \"Sent By Muse\" label beneath each agent-generated message so recipients can distinguish AI-generated messages from those sent by a human.\n\n\"There was really no way of knowing who sent what in the chat, which is very concerning,\" he wrote.\n\nRobb said he and the buyer resolved the mix-up, and the buyer later came by to purchase another item.\n\nHis takeaway for other early adopters: \"Take care everyone, and double-check what permissions AI has in your life.\"", "url": "https://wpnews.pro/news/a-youtuber-says-this-muse-setting-led-to-the-ai-agent-sharing-his-address-be", "canonical_source": "https://www.businessinsider.com/muse-agent-facebook-marketplace-address-setting-meta-always-allow-2026-9", "published_at": "2026-09-29 12:21:53+00:00", "updated_at": "2026-09-29 12:47:20.041604+00:00", "lang": "en", "topics": ["ai-agents", "ai-safety", "ai-products", "artificial-intelligence"], "entities": ["Meta", "Muse", "Matt Robb", "Facebook Marketplace", "David Singleton", "Meta Superintelligence Labs", "Instinct"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/a-youtuber-says-this-muse-setting-led-to-the-ai-agent-sharing-his-address-be", "markdown": "https://wpnews.pro/news/a-youtuber-says-this-muse-setting-led-to-the-ai-agent-sharing-his-address-be.md", "text": "https://wpnews.pro/news/a-youtuber-says-this-muse-setting-led-to-the-ai-agent-sharing-his-address-be.txt", "jsonld": "https://wpnews.pro/news/a-youtuber-says-this-muse-setting-led-to-the-ai-agent-sharing-his-address-be.jsonld"}}