Walmart bets on AI agent rails while Amazon builds walls

Walmart opened its Agent Gateway to AI shoppers this week. Amazon is blocking them. That's not just two companies making different product calls — it's a fork in the road for every retailer, and the direction you pick now may determine whether you own your customer relationship in five years or rent access to it from whoever built the agent they're using.

On Wednesday, Walmart President and CEO John Furner announced the Agent Gateway at the Masters of Scale Summit in San Francisco. As TechCrunch reported, the Agent Gateway is an MCP server — built on the Model Context Protocol, originally created by Anthropic — that lets approved AI agents connect to Walmart and Sam's Club, search inventory, and complete purchases on behalf of shoppers. Integrations with ChatGPT, Gemini, and Meta's Muse are already in place. No Walmart+ membership required.

The privacy architecture is worth noting. Walmart says agents can't touch a customer's payment information or broader shopping history. Instead, the Gateway helps an agent find a shopper's usual items — their preferred brand of milk, their go-to sourdough — without handing over the full purchase record. Agents that don't comply with Walmart's terms get blocked. The terms are blunt: agents must not take actions beyond what the shopper intends.

Agent Profiles, rolling out next month, let customers authorize each agent separately within their Walmart account, view agent purchases apart from their own, and set spending controls — The Verge gives the example of a cap like $100. By default, every agent purchase requires explicit approval. Customers can delete an agent's profile at any time.

Amazon, meanwhile, has gone the other way. According to The Verge, Amazon blocked Perplexity's shopping agent and Meta's Muse from making purchases on its platform. Travel and booking sites have done the same, according to TechCrunch. The instinct is understandable: if an AI agent is picking the product, your carefully optimized product page, your sponsored listings, your cross-sell carousel — none of it matters anymore. The agent decides. Why build a funnel if someone else's software walks around it?

The wrong question is 'will agents actually buy things?'

They already are. The more important question is: when an agent completes a purchase, whose infrastructure did it run on? Walmart's answer is: ours. By building the Gateway, Walmart becomes the authenticated, trusted intermediary between the agent and the transaction. It sets the terms. It controls what data the agent sees. It decides which agents get approved. That's not just a feature — that's a toll road.

Amazon's block-everything approach protects today's conversion funnel. Walmart's open-gateway approach bets that the funnel is already dying, and that the retailer who controls the agent rails collects a cut of every transaction that flows through them, regardless of which AI the shopper is using. Owning the rails is worth more than protecting a UI that agents will route around anyway.

The fair counterargument: Walmart is taking a real risk. Opening your platform to agents means accepting that brand loyalty, impulse purchases, and discovery — the things that make retail margins — get filtered through an algorithm you don't control. An agent optimizing for price and past preference is not going to be upsold on the premium version. Amazon may be right that protecting the experience is worth the friction of blocking agents now, while the behavior is still nascent.

Honest answer: maybe. But Amazon blocked Perplexity and Meta's Muse specifically — two agents with real user bases. That's not a wait-and-see posture, that's a wall. And walls have a habit of becoming permanent policy long after the threat they were built to stop has found a different door.

What this means for your business

If you sell through Amazon, this is a signal worth taking seriously. Your product listings are already competing on a platform that's actively hostile to the agents your customers may be using to shop. That's a distribution risk, not just a feature gap. Ask your e-commerce lead this week: what share of our traffic do we think is already agent-assisted, and what happens to our conversion if those agents get blocked or redirected?

If you run your own e-commerce, the Walmart model is the clearest blueprint available right now for how to receive AI agents without losing control of your customer data or your returns process. The Agent Profile structure — separate authorization, spending limits, approval by default — is a framework any operator could adapt. The question is whether your platform can support MCP connections, and if not, when that changes.

And if you're a brand that sells on both platforms: you now have a split reality. On Walmart, an agent can find your product and buy it. On Amazon, it can't — at least not through the agents Amazon has blocked. That asymmetry will show up in your channel mix data before most people realize what caused it.

Watch for two things in the next 90 days. First, whether other major retailers follow Walmart's lead or Amazon's — if a third or fourth large platform builds an MCP gateway, the open-agent model becomes the default and Amazon's wall looks increasingly like a liability. Second, watch agent adoption numbers. Walmart's bet only pays off if a meaningful share of shoppers actually delegate purchases to agents. If adoption stays thin, Amazon's caution looks smart and Walmart's infrastructure spend looks early. My read: the adoption curve on agentic shopping is steeper than most retailers are modeling for, and Walmart just got a head start on the only part of it that's hard to copy quickly — the trust infrastructure.