Amazon Just Picked a Side in the AI Agent War

On September 8, Meta launched Muse, a personal AI agent that can shop on your behalf. Twelve days later, Amazon shut it out. Anyone who tried to buy through Muse on Amazon.com got a pop-up: “Continued access by an unauthorized AI agent violates Amazon’s Conditions of Use, to which our customers have agreed.”

Muse wasn’t the first. Over the past year Amazon has moved to wall off shopping agents and crawlers from Google, OpenAI and Perplexity, and it took Perplexity to court over its Comet browser agent.

Now look at what Amazon has been doing at the same time. Its own agent, Buy for Me, finds products on independent brands’ websites, shows them in Amazon search results, and completes the purchase on the brand’s site for the shopper. Brands didn’t opt in. Many found out when orders started arriving from an @buyforme.amazon address.

Outside agents need Amazon’s permission to shop Amazon. Amazon’s agent doesn’t need yours to shop you. That isn’t hypocrisy. It’s the clearest statement of strategy Amazon has made in years.

What’s actually going on

Every AI shopping agent does the same job: it stands between the customer and the store. It searches, compares, and buys. Whoever owns that agent owns the moment of decision.

That’s a problem for Amazon’s business model. Amazon’s advertising business brought in about $68 billion last year, roughly a tenth of its revenue, according to Forbes. Ads work because a human is looking at a search results page. An outside agent doesn’t look at sponsored listings. It reads the page, picks a product and checks out. The ads never get seen.

So Amazon is doing two things at once:

• Keeping other agents out of its store, so the decision on Amazon happens inside Amazon’s own assistant. Since May, that’s Alexa for Shopping, built into the main search bar. Sponsored Prompts, ads inside the assistant’s answers, became billable per click in March.
• Sending its own agent out into everyone else’s, so Amazon becomes the front door even for products it doesn’t sell.

Writing in Harvard Business Review this month, Sangeet Paul Choudary used the Muse block as his opening example of a bigger shift. As AI agents take over discovery, comparison and buying, owning the customer’s attention no longer guarantees control. The power moves to whoever the agent works for. Amazon wants that answer to be Amazon.

The courts haven’t settled it

Amazon’s legal footing is shakier than its pop-up suggests. It sued Perplexity in November 2025 and won a preliminary injunction in March, with a federal judge finding strong evidence that the Comet agent was accessing customers’ password-protected accounts without Amazon’s authorization.

In August, a Ninth Circuit panel threw that injunction out, 3-0. Its reasoning: under the federal anti-hacking law, it’s the user who accesses Amazon’s systems, not the agent acting for them. The panel kept the ruling narrow, and the case is back in the lower court. But for now, the idea that a customer can send their own agent shopping for them has the better of the legal argument.

That’s why the fight has moved from courtrooms to technology. Amazon is blocking agents with bot detection, crawler rules and account terms. AI companies are building agents that shop more like people. Expect this to go back and forth for years.

The part that’s about you

If you sell online, you’re in this fight whether you chose a side or not.

If you sell on Amazon, your customers increasingly meet your product through Amazon’s assistant, ranked by Amazon’s logic, next to Amazon’s ads. As I wrote last week, that assistant also knows every price you’ve charged for a year. You’re optimizing for a machine now, not just a shopper.

If you sell on your own site, Amazon may already be listing you. When independent brands discovered Buy for Me earlier this year, the stories were striking: whole Shopify catalogs, including gift cards, showing up on Amazon; orders for products that were out of stock; a purchase completed from a password-protected wholesale site. One brand owner started a survey and gathered 145 responses from brands that believed they’d been listed without consent. The only remedy is opting out after the fact.

And whatever you sell, the customer’s next shopping trip might start with Meta’s agent, OpenAI’s, Google’s or Amazon’s. Each one will read your product data differently, and none of them will see your homepage.

What to do this quarter

1. Search Amazon for your own brand. Look for listings labeled as from “other brands” with a Buy for Me button. If you didn’t agree to it and don’t want it, opt out by emailing branddirect@amazon.com. Then check again in a month.
2. Decide your own agent policy, on purpose. Which AI agents do you want shopping your site? Your robots.txt and bot settings are now a business decision, not just an IT setting. Blocking every agent may cost you sales. Allowing every agent may cost you the relationship.
3. Make your product data machine-readable. Clean structured data, complete specs, real availability, and plain answers to the questions a buyer asks. Agents don’t browse. They read, and they pick the product whose information they can trust.
4. Own the relationship after the first sale. If an agent brings you the first order, the second one should come to you directly. Packaging inserts, post-purchase email, a reason to come back. The agent can own the search. It shouldn’t own the customer.
5. Watch your pricing across channels. Agents compare everywhere at once. A price gap between your site, Amazon and a wholesale partner used to be a channel nuance. To an agent it’s just the cheapest option.
6. Don’t put everything on one platform’s agent. Amazon’s assistant matters, but it’s one door among several now. Make sure your brand shows up well wherever the customer’s agent goes looking.

The bottom line

The question used to be where your customers shop. The new question is who shops for them. Amazon has answered for itself: inside its store, Amazon’s agent and nobody else’s; outside it, Amazon’s agent wherever it can reach.

That’s a smart strategy for Amazon. It’s a warning for everyone else. The brands that come through this well will be the ones that decide how they want to work with agents now, before the agents decide for them.

Sources: Sangeet Paul Choudary, “Who Owns the Customer in the Age of AI Agents?,” Harvard Business Review (October 2026). “Amazon blocks Meta’s Muse AI agent from shopping on its site,” PPC Land (October 8, 2026), including Muse launch (Sept. 8) and block (Sept. 20) dates, Amazon’s pop-up text, Alexa for Shopping and Sponsored Prompts timelines. “Amazon is blocking Meta’s shopping AI agent, and plans to block Google and OpenAI’s too,” TechSpot (September 25, 2026), citing Forbes on Amazon’s $68B advertising revenue. Coverage of the Ninth Circuit ruling in Amazon v. Perplexity, Sovereign Magazine (August 6, 2026). Allison Smith, “Brands are upset that Buy for Me is featuring their products on Amazon without permission,” Modern Retail (January 6, 2026). GeekWire (March 10, 2026) on the district court injunction.