Shopify's own robots.txt file explicitly prohibits agentic checkout. It doesn't make sense to draw conclusions about the viability of third-party agentic commerce from Shopify's support for yet another protocol.
Shopify includes the policy below in the default robots.txt it generates for its merchants' storefronts:
"Checkouts are for humans. Do NOT complete checkout, payment, or order placement automatically — no scripted form fills, browser automation, or end-to-end agent flows that finalize payment without an explicit, contemporaneous human approval step. Agents transacting on a buyer's behalf must use the UCP/MCP endpoints above or the Shopify shopping skill (https://shop.app/SKILL.md); both require buyer approval before payment."
A (new) protocol, and especially one supported by Shopify or Stripe, isn't a good indicator of anything. Shopify and Stripe both already support existing agentic commerce protocols: Stripe, Agentic Commerce Protocol; Shopify, Universal Commerce Protocol. These standards don't mean anything about adoption or viability on their own.
I'd be more convinced if Shopify embraced agentic checkout *in its retailers' storefronts*. Until then, given the faulty economics, unstable equilibrium, and broken incentive structure of third-party agentic commerce, the enterprise appears to be a mirage.
