# update_coupon

Update an existing coupon

Agent View of the PolicyLayer registry record for `update_coupon`. HTML page: https://policylayer.com/tools/ghl/update-coupon

## Facts

- Tool: `update_coupon`
- Server: Ghl (`ghl-mcp-server`) — https://policylayer.com/tools/ghl.md
- Install: `npx -y ghl-mcp-server`
- Homepage: git+https://github.com/mastanley13/ghl-mcp.git
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 12 (8 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `id` | string | yes | Coupon ID |
| `code` | string | yes | Coupon code |
| `name` | string | yes | Coupon name |
| `altId` | string | yes | Location ID |
| `altType` | string | yes | Alt Type |
| `endDate` | string | no | End date in YYYY-MM-DDTHH:mm:ssZ format |
| `startDate` | string | yes | Start date in YYYY-MM-DDTHH:mm:ssZ format |
| `productIds` | array | no | Product IDs that the coupon applies to |
| `usageLimit` | number | no | Maximum number of times coupon can be used |
| `discountType` | string | yes | Type of discount |
| `discountValue` | number | yes | Discount value |
| `limitPerCustomer` | boolean | no | Whether to limit coupon to once per customer |

Parameters from the server's own tool schema.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "update_coupon",
    "arguments": {
      "id": "<id>",
      "code": "<code>",
      "name": "<name>",
      "altId": "<altId>",
      "altType": "<altType>",
      "startDate": "<startDate>",
      "discountType": "<discountType>",
      "discountValue": 0
    }
  }
}
```

## Why update_coupon is rated Medium

This tool creates or modifies data (a coupon record) in a reversible way. It is not a Read operation (no retrieval only), not Destructive (the coupon is not deleted, only updated), not Execute (no arbitrary code execution), and not Financial (no money movement, though coupons have business value).

From the tool's own definition: "Tool name is 'update_coupon' and description states 'Update an existing coupon', which modifies existing data in a reversible manner without deleting or destroying it."

Risk signals: Accepts freeform code/query input (code) · High parameter count (17 properties)

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Ghl (252)

- `bulk_delete_social_posts` — Destructive — https://policylayer.com/tools/ghl/bulk-delete-social-posts.md
- `cancel_scheduled_email` — Destructive — https://policylayer.com/tools/ghl/cancel-scheduled-email.md
- `cancel_scheduled_message` — Destructive — https://policylayer.com/tools/ghl/cancel-scheduled-message.md
- `delete_appointment` — Destructive — https://policylayer.com/tools/ghl/delete-appointment.md
- `delete_appointment_note` — Destructive — https://policylayer.com/tools/ghl/delete-appointment-note.md
- `delete_calendar` — Destructive — https://policylayer.com/tools/ghl/delete-calendar.md
- `delete_calendar_group` — Destructive — https://policylayer.com/tools/ghl/delete-calendar-group.md
- `delete_calendar_notification` — Destructive — https://policylayer.com/tools/ghl/delete-calendar-notification.md
- `delete_calendar_resource_equipment` — Destructive — https://policylayer.com/tools/ghl/delete-calendar-resource-equipment.md
- `delete_calendar_resource_room` — Destructive — https://policylayer.com/tools/ghl/delete-calendar-resource-room.md
- `delete_contact` — Destructive — https://policylayer.com/tools/ghl/delete-contact.md
- `delete_contact_note` — Destructive — https://policylayer.com/tools/ghl/delete-contact-note.md
- `delete_contact_task` — Destructive — https://policylayer.com/tools/ghl/delete-contact-task.md
- `delete_conversation` — Destructive — https://policylayer.com/tools/ghl/delete-conversation.md
- `delete_coupon` — Destructive — https://policylayer.com/tools/ghl/delete-coupon.md
- `delete_custom_provider_integration` — Destructive — https://policylayer.com/tools/ghl/delete-custom-provider-integration.md
- `delete_email_template` — Destructive — https://policylayer.com/tools/ghl/delete-email-template.md
- `delete_invoice_template` — Destructive — https://policylayer.com/tools/ghl/delete-invoice-template.md
- `delete_location` — Destructive — https://policylayer.com/tools/ghl/delete-location.md
- `delete_location_custom_field` — Destructive — https://policylayer.com/tools/ghl/delete-location-custom-field.md
- `delete_location_custom_value` — Destructive — https://policylayer.com/tools/ghl/delete-location-custom-value.md
- `delete_location_tag` — Destructive — https://policylayer.com/tools/ghl/delete-location-tag.md
- `delete_location_template` — Destructive — https://policylayer.com/tools/ghl/delete-location-template.md
- `delete_media_file` — Destructive — https://policylayer.com/tools/ghl/delete-media-file.md
- `delete_object_record` — Destructive — https://policylayer.com/tools/ghl/delete-object-record.md
- `delete_opportunity` — Destructive — https://policylayer.com/tools/ghl/delete-opportunity.md
- `delete_social_account` — Destructive — https://policylayer.com/tools/ghl/delete-social-account.md
- `delete_social_post` — Destructive — https://policylayer.com/tools/ghl/delete-social-post.md
- `ghl_delete_association` — Destructive — https://policylayer.com/tools/ghl/ghl-delete-association.md
- `ghl_delete_custom_field` — Destructive — https://policylayer.com/tools/ghl/ghl-delete-custom-field.md
- …and 222 more: https://policylayer.com/tools/ghl.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`

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