Packrift

Use when the user names a category by keyword (e.g. 'kraft tape', 'bubble mailer', 'starter kit') with no dimensions. For dimension-based fit, prefer find_packaging_for_item. Returns products with price, stock, URL.

Use after find_packaging_for_item or search_products to pull full detail for a handle: all variants, SKUs, dimensions, weight, stock. Input: handle. Call before building a cart to map qty to the right variant.

Use to confirm live unit price and line total for variants about to go in a cart. Inputs: variant_ids (numeric), quantity. Returns unit_price, currency, available_quantity, line_total. Never cached.

Use to confirm a SKU is in stock before recommending it or building a cart. Input: variant_ids (numeric). Returns available count and in_stock boolean per variant. Live, never cached.

Use when the user has an item's L/W/D and needs the right box or mailer (also: box-vs-mailer, Uline-by-size). Inputs: L/W/D in, weight lb, use_case (mailer|box|fragile|apparel|ecommerce). Returns 5 SKUs ranked by fit with price, stock, URL.

Use when the user asks shipping cost to a ZIP for a chosen cart. Inputs: destination_postal_code, country (US|CA), items[{variant_id, qty}]. Returns carrier rate options with price and currency.

Final step: hand the user off to checkout. Inputs: items[{variant_id, qty}], optional discount_code. Returns a packrift.com/cart/... permalink with ?ref=mcp attribution and optional &discount=<code>.