# stateset_apply_checkout_coupon

Applies a coupon code to a checkout session. Validates the coupon and applies any applicable discounts.

Agent View of the PolicyLayer registry record for `stateset_apply_checkout_coupon`. HTML page: https://policylayer.com/tools/stateset-mcp-server/stateset-apply-checkout-coupon

## Facts

- Tool: `stateset_apply_checkout_coupon`
- Server: Stateset (`stateset/stateset-mcp-server`) — https://policylayer.com/tools/stateset-mcp-server.md
- Homepage: https://github.com/stateset/stateset-mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "stateset_apply_checkout_coupon",
    "arguments": {}
  }
}
```

## Why stateset_apply_checkout_coupon is rated Medium

This tool modifies checkout state by applying a coupon/discount, which changes the cart or order data reversibly. While it affects pricing and financial outcomes, it does not directly move money or commit financial obligations—it only modifies transaction data before payment. This is a Write operation (modifies data reversibly) rather than Financial (which requires actual money movement).

From the tool's own definition: "Applies a coupon code to a checkout session. Validates the coupon and applies any applicable discounts."

## Use case

AI agents use stateset_apply_checkout_coupon to create or update resources in Stateset, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Stateset environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Stateset:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "stateset_apply_checkout_coupon": {
      "limits": [
        {
          "counter": "stateset_apply_checkout_coupon_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Stateset (237)

- `stateset_cancel_asn` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-cancel-asn.md
- `stateset_cancel_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-cancel-order.md
- `stateset_cancel_purchase_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-cancel-purchase-order.md
- `stateset_cancel_work_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-cancel-work-order.md
- `stateset_clear_cache` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-clear-cache.md
- `stateset_clear_cart` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-clear-cart.md
- `stateset_delete_asn` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-asn.md
- `stateset_delete_bill_of_materials` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-bill-of-materials.md
- `stateset_delete_cart` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-cart.md
- `stateset_delete_cash_sale` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-cash-sale.md
- `stateset_delete_customer` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-customer.md
- `stateset_delete_fulfillment_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-fulfillment-order.md
- `stateset_delete_inventory` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-inventory.md
- `stateset_delete_invoice` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-invoice.md
- `stateset_delete_item_receipt` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-item-receipt.md
- `stateset_delete_manufacturer_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-manufacturer-order.md
- `stateset_delete_notification` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-notification.md
- `stateset_delete_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-order.md
- `stateset_delete_payment` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-payment.md
- `stateset_delete_product` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-product.md
- `stateset_delete_product_variant` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-product-variant.md
- `stateset_delete_purchase_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-purchase-order.md
- `stateset_delete_rma` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-rma.md
- `stateset_delete_robot_serial` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-robot-serial.md
- `stateset_delete_sales_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-sales-order.md
- `stateset_delete_shipment` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-shipment.md
- `stateset_delete_supplier` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-supplier.md
- `stateset_delete_user` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-user.md
- `stateset_delete_warranty` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-warranty.md
- `stateset_delete_work_order` — Destructive — https://policylayer.com/tools/stateset-mcp-server/stateset-delete-work-order.md
- …and 207 more: https://policylayer.com/tools/stateset-mcp-server.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=stateset-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/stateset-mcp-server