Browser-based purchasing automation is moving closer to checkout, but AI still does not buy on its own. Yet reliability, consent, and flow design still determine whether real transactions can reach completion. The change expands assistance, not independent buying, so value depends on controlled use. What Shopify’s WebMCP checkout update actually enables The core shift is not that AI suddenly becomes the buyer. For readers tracking Shopify WebMCP checkout agents, the key change is scope, not magic.