Return the Mercadona shopping playbook: how to present products (ALWAYS as a photo-grid artifact), fill and review the real cart, use 'my regulars', and reorder past shops. Call this once at the start of any Mercadona task — before searching or adding to the cart — and follow it.

Check whether the Mercadona session is valid and how long the token lasts.

Open a browser window to sign in to Mercadona. The user logs in (and handles any 2FA/SCA); the session is then saved so all other tools work. Call this when not signed in, or when a tool reports the session expired.

Find a product and its id (needed before add_to_cart), scoped to the user's delivery area. Use a short term; prefer the house brand 'Hacendado' unless asked otherwise. Returns matches with ids and prices.

Get details for a single product by id.

Show the current real shopping cart (items, quantities, total).

Products you usually buy. kind='precision' = most bought; kind='recall' = also bought.

List past orders (date, total, status, item count). Page is 1-based.

List the products in a past order (without adding anything). Defaults to the most recent order if order_id is omitted.

Available delivery slots. Uses your first address if address_id is omitted.

Add a product to the real cart by id (get the id from search_products or get_my_regulars first). If already present, increases the quantity. Returns the updated cart with its total.

Set the exact quantity of a product in the cart. Quantity 0 removes it. Returns the updated cart.

Remove a product from the cart entirely. Returns the updated cart.

Add all items from a past order to the cart in one step (a 'buy again'). Defaults to the most recent order. Skips items no longer available and reports them. Returns the updated cart.