AI Engineer World's Fair 2026 — unofficial import demo

Agents are already handling product discovery, cart building, and checkout — no human clicking required. But what's the protocol stack actually making this work? This talk maps the real infrastructure: MCP for tool access, A2A for agent coordination, the ACP spec (backed by OpenAI) and the UCP spec (backed by Google) — two competing approaches to standardizing the full agentic commerce lifecycle — and AP2 for agentic payments. We'll cover what each does, how they compose, and where they're still forming. Then we'll see it live — a working demo with a protocol inspector showing every tool call, task transition, and checkout event in real time. You'll leave with a clear mental model of the agentic commerce landscape and a reference implementation you can use.