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ProtoClinical

First seen 2026-08-17 · Last seen 2026-08-17 · Source: webmcp.com

Answer 4 · Act 6 · Transact 0 · Score: Not yet scored

Tool inspector

update_cart

act imperative

Add products to the cart, update line item quantities, or remove items. Batch EVERY change for one request into a SINGLE call — line_items accepts up to 10 entries; do NOT call update_cart once per item. Do NOT retry a call that already returned a result: adds are cumulative, so repeating a call adds duplicate items. Use line_items[].item.id with a ProductVariant GID when the exact variant is known. Use line_items[].id from get_cart to update or remove an existing line, passing the ABSOLUTE target quantity (not a delta; quantity 0 removes the line). Use handle or query only when adding the selected or first available variant.

Page: /

Input schema

Property	Type	Required	Description
`cart`	object	yes	—

Raw JSON schema

{
  "type": "object",
  "required": [
    "cart"
  ],
  "properties": {
    "cart": {
      "type": "object",
      "required": [
        "line_items"
      ],
      "properties": {
        "line_items": {
          "type": "array",
          "description": "Items to add or update (1-10).",
          "items": {
            "type": "object",
            "properties": {
              "id": {
                "type": "string",
                "description": "Existing cart line id from get_cart. Use to update or remove an existing line. Omit when adding new items."
              },
              "item": {
                "type": "object",
                "description": "The merchandise to add.",
                "properties": {
                  "id": {
                    "type": "string",
                    "description": "ProductVariant GID from get_product variants[].id, e.g. \"gid://shopify/ProductVariant/123\"."
                  }
                }
              },
              "handle": {
                "type": "string",
                "description": "Product handle. Adds the selected or first available variant; call get_product first if the user requested specific options."
              },
              "query": {
                "type": "string",
                "description": "Search query to find and add the selected or first available variant. For specific variants, call search_catalog/get_product first and pass item.id."
              },
              "quantity": {
                "type": "integer",
                "description": "Quantity. Defaults to 1 for adds and updates. Set to 0 with an existing line id to remove it.",
                "default": 1
              }
            }
          }
        }
      }
    }
  }
}