Amazon (NASDAQ: AMZN) has shut down Meta’s (NASDAQ: META) recently launched Muse personal AI agent from completing purchases on Amazon.com, drawing a sharp line in the emerging contest over who controls agentic shopping. The restriction took effect Sunday night, September 20, 2026.
Users who asked Muse to browse or buy on the retailer’s site began seeing a pop-up stating that continued access by an unauthorized AI agent violates Amazon’s Conditions of Use.
The move followed an unsuccessful request that Meta simply exclude Amazon from the Muse shopping experience.
Muse debuted on September 8 as a general-purpose agent meant to handle multi-step work rather than answer isolated questions.
It can connect to email, calendars, payments, and shopping sites, either through public APIs or by operating a browser the way a person would.
Meta has said the agent cannot see passwords or payment details; credentials sit in isolated storage and Muse must seek user approval before completing sensitive steps such as checkout.
Early testers used it to compare products and place orders, and the free app quickly rose to the top of US app-store charts.
Amazon’s objections center on process and disclosure.
The company says Meta never informed it that Muse would visit the store and never obtained permission.
Amazon also contends the agent does not identify itself while browsing and appears to capture and retain customer credentials.
In Amazon’s view, that combination lets an undisclosed third party move through account pages, order history, and checkout flows without the merchant’s knowledge.
A spokesperson argued that any third-party service offering to buy from another business should operate openly and honor the merchant’s choice to participate or not—the same expectation that applies to food-delivery platforms and online travel agencies.
“Agentic third-party applications such as Muse have the same obligations,” the company said, adding that it had asked Meta to remove Amazon from the product.
The clash is notable because the two firms remain commercial partners in other areas.
Amazon listings can already be purchased inside Facebook and Instagram, and Meta recently signed a large deal to run agentic workloads on Amazon’s cloud chips.
At the same time, Amazon has spent a year trying to keep rival agents off its catalog, previously targeting tools from Perplexity, Google, and OpenAI.
The retailer also fields its own shopping assistants, including Buy for Me, which it says identifies itself and allows brands to opt out.
Amazon’s advertising business, which depends on shoppers lingering on its pages, adds another incentive to keep the customer relationship inside its own walls.
The dispute highlights a larger tension in agentic commerce.
Consumers may want a single assistant that can shop anywhere; large retailers want to decide which software can act inside customer accounts and how that software presents itself.
Amazon is relying on its terms of service rather than hacking claims, an approach left open after a recent appellate ruling in a related case against Perplexity.
Meta had not issued a public response at the time the block appeared.Whether the two companies negotiate a structured integration, or whether other merchants follow Amazon’s lead, will help determine how freely personal AI agents can move money across the open web.