Look up the current user's organization info and ALL delivery addresses on Meican. Call this once per user to discover their suggested_default_address (= most recently used pickup point); store the returned unique_id on the user's profile and pass it as address_unique_id to meican_place_order.

List meal sessions ('餐次', e.g. 午餐, 晚餐) available for a given date. Each tab has a tab_unique_id and a target_time (the order deadline as 'YYYY-MM-DD HH:MM') which you pass verbatim to subsequent tools. Use this FIRST when the user wants to order or view orders for a day. If existing_order is non-null for a tab, the user has already ordered from it — surface that instead of placing a duplicate.

List restaurants serving in one meal session. Returns each restaurant's unique_id and name. Get the args from meican_list_meal_tabs.

Show one restaurant's full menu for a meal session. Returns dishes grouped by section. You need dish_id values from here to place an order.

List the current user's existing Meican orders for a date plus any unpaid items. Call this BEFORE meican_place_order to avoid duplicates.

Show full status of one order by its uniqueId, including pickup location, current pay status, and dishes. Use after placing an order to confirm it succeeded (expect status_info='NEW_ORDER', pay_status='SUCCESS').

Place a meal order. DESTRUCTIVE: this may charge the user or consume an organization subsidy. ALWAYS confirm dish names, counts, total price, target time, and pickup address with the user BEFORE calling this. Set dry_run: true first to inspect the payload without submitting.

Cancel a meal order. DESTRUCTIVE: this removes the order. ALWAYS confirm with the user before calling.