Storefront codebases have a specific way of rotting: not through any one bad decision, but through years of small, individually-reasonable special cases — a promo code exception here, a shipping-rule override there — none of which were ever written down anywhere except the code itself.
Checkout and pricing logic are full tier more often than they look
A new discount-stacking rule or a change to how tax gets calculated across regions looks like "just some conditional logic" and is regularly exactly the kind of change with real financial and data-integrity risk that belongs in full tier. The tier decision's "data model change with real migration risk" criterion catches more storefront work than founders expect, specifically because pricing and inventory changes tend to ripple into places nobody fully mapped out in advance.
Investigate-before-fix matters most where money is involved
A bug that causes incorrect charges, doubled inventory decrements, or a promo applying when it shouldn't is precisely the wrong place for a guessed fix. The Investigate skill's requirement to cite a root cause by file and line, and to verify actual behavior rather than reason from code alone, is worth the extra ten minutes every time the alternative is a guessed patch to logic that touches customer payments.
Analysis-first for the perpetual redesign
Storefronts get redesigned more often than most software, and rarely from a blank slate — there's almost always an existing site, existing conversion data, and existing brand material to work from. design-analysis and art-analysis extracting the current functional and visual system before a redesign spec gets written keeps "redesign the product page" grounded in what the page actually does today, rather than a general impression of it.
Seasonal spikes make approval discipline non-negotiable
Nobody wants an agent quietly revising an approved checkout change three days before a seasonal traffic spike because it noticed something that "could be better." The approval gate holding firm through implementation is exactly the guarantee that matters most when the cost of an unreviewed last-minute change is a broken checkout flow during your highest-traffic week of the year.
E-commerce doesn't need more process for its own sake — it needs the process concentrated exactly where money, inventory, and customer trust intersect, and light everywhere else.