How AI Agents Shop, Work, and Transact: The MCP–UCP Architecture Breakdown

The protocol layer of agentic AI is being built right now - here’s what every developer needs to understand Beneath the visible surface of the AI agent boom, a quieter infrastructure story is being written. MCP from Anthropic and UCP from a Google-Shopify partnership are independently solving different layers of the same problem: how does an AI agent interact reliably and safely with external systems? And specifically, how does it spend money? Model Context Protocol gives any language model a standardized handshake with any external tool.