What changed
Amazon blocked Meta's Muse agent from shopping on Amazon.com starting September 20. Amazon says Meta never told it Muse would access the store, the agent does not identify itself while browsing, and it appears to capture and store customer login credentials. Meta says Muse cannot see passwords or payment details; credentials sit in secure storage the agent uses without viewing them. Muse launched September 8 and hit the top of the U.S. App Store within 12 days.
What you can do with it now
If you want an agent to shop or book for you, ask it which sites it can access and how it handles logins before you connect accounts. Most agents work through APIs or browser automation. API access is cleaner but limited to sites that allow it. Browser automation works everywhere but looks like you browsing, which means the agent can do anything you can. Test it on a low-stakes purchase first: a book, office supplies, something you can return if the agent picks wrong. Watch what it adds to cart and what it actually buys.
What to keep in your own hands
Don't connect payment accounts to any agent until you verify how it stores credentials and whether you can revoke access without changing your password everywhere. Check if the agent asks for approval before completing purchases or if it buys on its own once you say yes to one item. Know which sites the agent can access and which it cannot — if a site blocks it, the agent may stop working mid-task. Never let an agent browse your bank, payroll, or accounting software without knowing exactly what it logs and where that log lives after.