refund_order

Instructions

Implementation Reference

• src/tools/orders.ts:506-554 (handler)

  The handler function for the 'refund_order' tool. Builds the RefundInput payload (orderId, notify, refundLineItems, shipping, currency, note), calls the REFUND_CREATE_MUTATION GraphQL mutation, checks for user errors, and returns the refund GID and total refunded amount.

    async (args) => {
      const input: Record<string, unknown> = {
        orderId: toGid(args.id, "Order"),
        notify: args.notify,
      };
      if (args.refundLineItems) {
        input.refundLineItems = args.refundLineItems.map((li) => ({
          lineItemId: li.lineItemId,
          quantity: li.quantity,
          restockType: li.restockType,
          locationId: li.locationId,
        }));
      }
      if (args.shipping) input.shipping = args.shipping;
      if (args.currency) input.currency = args.currency;
      if (args.note) input.note = args.note;
  
      const data = await client.graphql<{
        refundCreate: {
          refund: {
            id: string;
            totalRefundedSet: {
              shopMoney: { amount: string; currencyCode: string };
            };
            note?: string | null;
          } | null;
          userErrors: ShopifyUserError[];
        };
      }>(REFUND_CREATE_MUTATION, { input });
      throwIfUserErrors(data.refundCreate.userErrors, "refundCreate");
      const r = data.refundCreate.refund;
      if (!r) {
        return {
          content: [
            { type: "text" as const, text: "refundCreate returned no refund." },
          ],
        };
      }
      const total = `${r.totalRefundedSet.shopMoney.amount} ${r.totalRefundedSet.shopMoney.currencyCode}`;
      return {
        content: [
          {
            type: "text" as const,
            text: `Refunded ${total} on ${args.id} — refund ${r.id}`,
          },
        ],
      };
    },
  );

• src/tools/orders.ts:291-321 (schema)

  The input schema for 'refund_order'. Defines fields: id (order GID/numeric), refundLineItems (array of line items with quantities and restockType), shipping (full refund or specific amount), currency, note, and notify flag.

  const refundOrderSchema = {
    id: z
      .string()
      .describe("Order GID or numeric ID to refund."),
    refundLineItems: z
      .array(refundLineItemSchema)
      .optional()
      .describe(
        "Specific line items to refund with quantities. Omit to do a refund without item-level breakdown (use for shipping-only or adjustment refunds).",
      ),
    shipping: z
      .object({
        fullRefund: z.boolean().optional(),
        amount: z.string().optional().describe("Specific shipping refund amount as decimal string."),
      })
      .optional()
      .describe(
        "Refund part or all of shipping. Pass {fullRefund: true} to refund everything paid in shipping; or {amount: '5.00'} for a specific amount.",
      ),
    currency: z
      .string()
      .optional()
      .describe(
        "ISO currency code. Required for multi-currency stores; defaults to the order's currency otherwise.",
      ),
    note: z.string().optional().describe("Internal note explaining the refund."),
    notify: z
      .boolean()
      .default(false)
      .describe("Email the customer a refund notification."),
  };

• src/tools/orders.ts:276-289 (schema)

  The refundLineItemSchema used within refundOrderSchema. Defines lineItemId, quantity, restockType (NO_RESTOCK, CANCEL, RETURN), and locationId.

  const refundLineItemSchema = z.object({
    lineItemId: z.string().describe("LineItem GID from the order."),
    quantity: z.number().int().min(1).describe("How many of this line item to refund."),
    restockType: z
      .enum(["NO_RESTOCK", "CANCEL", "RETURN"])
      .default("NO_RESTOCK")
      .describe(
        "How to handle inventory: NO_RESTOCK (don't restock), CANCEL (restock as if cancelled), RETURN (restock as a return).",
      ),
    locationId: z
      .string()
      .optional()
      .describe("Location GID to restock to (required when restockType is CANCEL or RETURN)."),
  });

• src/tools/orders.ts:97-108 (helper)

  The REFUND_CREATE_MUTATION GraphQL mutation string. Calls refundCreate(input:) and returns the refund id, totalRefundedSet, note, and userErrors.

  const REFUND_CREATE_MUTATION = /* GraphQL */ `
    mutation RefundCreate($input: RefundInput!) {
      refundCreate(input: $input) {
        refund {
          id
          totalRefundedSet { shopMoney { amount currencyCode } }
          note
        }
        userErrors { field message }
      }
    }
  `;

• src/tools/orders.ts:502-554 (registration)

  Registration of the 'refund_order' tool on the MCP server via server.tool(). Registered inside registerOrderTools() which is called from src/server.ts line 58.

  server.tool(
    "refund_order",
    "Issue a refund against an order — for specific line items (with quantities and optional restock behaviour), for shipping, or both. Returns the new refund's GID and total amount refunded. To refund a full order use cancel_order with refund=true instead (one-step). Use this tool when refunding partially: just one item, just shipping, an adjustment without item breakdown, or a return that needs explicit restock-to-location handling. The `restockType` per line item controls inventory behaviour: NO_RESTOCK (default — the items aren't coming back), CANCEL (restock as if cancelled), RETURN (restock with a return record at the given locationId). Pass `notify: true` to email the customer.",
    refundOrderSchema,
    async (args) => {
      const input: Record<string, unknown> = {
        orderId: toGid(args.id, "Order"),
        notify: args.notify,
      };
      if (args.refundLineItems) {
        input.refundLineItems = args.refundLineItems.map((li) => ({
          lineItemId: li.lineItemId,
          quantity: li.quantity,
          restockType: li.restockType,
          locationId: li.locationId,
        }));
      }
      if (args.shipping) input.shipping = args.shipping;
      if (args.currency) input.currency = args.currency;
      if (args.note) input.note = args.note;
  
      const data = await client.graphql<{
        refundCreate: {
          refund: {
            id: string;
            totalRefundedSet: {
              shopMoney: { amount: string; currencyCode: string };
            };
            note?: string | null;
          } | null;
          userErrors: ShopifyUserError[];
        };
      }>(REFUND_CREATE_MUTATION, { input });
      throwIfUserErrors(data.refundCreate.userErrors, "refundCreate");
      const r = data.refundCreate.refund;
      if (!r) {
        return {
          content: [
            { type: "text" as const, text: "refundCreate returned no refund." },
          ],
        };
      }
      const total = `${r.totalRefundedSet.shopMoney.amount} ${r.totalRefundedSet.shopMoney.currencyCode}`;
      return {
        content: [
          {
            type: "text" as const,
            text: `Refunded ${total} on ${args.id} — refund ${r.id}`,
          },
        ],
      };
    },
  );