The Agentic Commerce Stack — Ahnaf Prio, Best Buy

Add a second unit of the same item to your cart and, to you, nothing much happened. To the merchant that is a second line item on the same SKU. Ahnaf Prio's argument is that agentic shopping breaks on exactly these unglamorous distinctions, which is why roughly 45% of sessions on the major assistants already touch shopping while the first wave of agents mostly failed at it. Those took screenshots, read the DOM and filled forms, and they were slow and brittle. From the merchant side an agent driving a browser trips every fraud alarm there is, so it often died at the payment step. What replaced it is a pile of acronyms he untangles one at a time: MCP for tool access, A2A so a customer agent and a merchant agent can talk, then two competing commerce primitives in ACP from OpenAI and UCP from Google, and AP2 for payment mandates that carry an authorizing party, a spend ceiling and a revocation URL. He runs the whole loop live through Ginny, his orange tabby recast as a bakery agent on Cerebras at 3,000 tokens per second, with an inspector showing every call and checkout state transition. Merchants push a product feed instead of answering catalog searches, because m merchants times n products does not scale. He also tries to haggle a discount code out of his own cat, which sets up the real lesson. Chipotle's agent got used to answer programming questions. Write evals for behavior, protocol compliance and latency, or play whack a mole in production. Speaker info: - https://linkedin.com/in/ahnafy - https://github.com/ahnafyy Timestamps: 0:00 - Figuring out what agentic commerce means at Best Buy 1:28 - Shopping is 45% of agent sessions 3:08 - Why screenshot and DOM agents failed 4:56 - Why merchants needed ACP and UCP 6:11 - The acronym map: MCP, A2A, ACP, UCP, AP2 8:18 - Product feeds instead of catalog search 10:01 - Payments today, and what AP2 adds 10:50 - Demo: Ginny the bakery agent 13:30 - AP2 tokens, and the same flow under ACP 16:28 - Evals, Chipotle, and whack a mole 19:08 - The template, eval starters and catalog sync