Walmart just made a pretty big move toward the future of AI shopping, and I think there are some important implications for retail media that brands and agencies need to be paying attention to.

In this episode, I’m resharing and unpacking Doug Chavez’s analysis of Walmart’s new operating rules for AI shopping agents, including why he believes the shelf is becoming an API, how agentic commerce could fundamentally change brand choice and repeat purchases, and what this means for retail media monetization, measurement, and product data. I also share a few additional thoughts on Walmart’s Agent Gateway, the advertising opportunities already emerging for machines, and why Amazon is taking a very different approach to AI-powered shopping.

Are we looking at the next major evolution of retail media? And are brands actually prepared for a world where machines, rather than humans, are making more of the shopping decisions?

This episode is sponsored by GrowthLoop

Timeline

[00:00] – Introducing Doug Chavez’s perspective on AI shopping agents and why AI assistants might actually consolidate the shopping journey.

[01:36] – Walmart’s new AI agent operating rules explained: agent profiles, the Agent Gateway, and the terms governing agent shopping.

[02:45] – Five implications of agentic commerce for brands: intent, repeat purchases, retail media monetization, measurement, and trust.

[05:19] – Why agentic commerce is no longer a future experiment and what brands need to do to prepare their product data, content, and media plans.

[07:17] – My take on Walmart’s Agent Gateway, Sparky, and the emerging possibility of advertising formats designed for AI agents.

[10:03] – Walmart versus Amazon: why their competing philosophies on third-party AI shopping agents could reshape retail media.

Links & Resources

• This piece by Doug Chavez originally ran on the Mars United Commerce blog on October 27, 2026, and is republished with permission.
• Doug’s piece from August actually set this concept up, well before Walmart’s announcement: The Shelf Is Becoming an API
• Follow Doug Chavez, Global EVP, Mars United Commerce/Publicis Commerce, on LinkedIn
• Walmart just published its operating rules for AI agents shopping on a customer’s behalf.
• Walmart’s Agent Gateway is still a beta for companies and developers.
• Walmart says outside agents connect through Sparky, its own shopping assistant. 
• Sparky has been running ads — sponsored prompts — since earlier this year. 
• Read my related articles:
  • Amazon is playing agentic commerce chicken. Other retailers should not.
  • Agentic Shopping Poses an Existential Threat to Retail Media, Part 1 and Part 2 
• I’m sharing comedy skits on Instagram about retail media! Follow along: @retailmediabreakfastclub
• Subscribe to Retail Media Breakfast Club’s daily newsletter
• Follow Kiri Masters on LinkedIn