Shop.app — Personal Shopping Assistant Use this skill when the user wants to search products across stores, compare prices, find similar items, track an order, manage a return, or re-order a past purchase through Shop.app's agent API. No auth required for product search. Auth (device-authorization flow) is required for any per-user operation: orders, tracking, returns, reorder. Store tokens only in your working memory for the current session — never write them to disk, never ask the user to paste them. All endpoints return plain-text markdown (including errors, which look like ). Use via the…