cart_add_discount_code

What cart_add_discount_code does on MCP Dynamics 365 Commerce Server

AI agents use cart_add_discount_code to create or update resources in MCP Dynamics 365 Commerce Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Dynamics 365 Commerce Server environment.

Why cart_add_discount_code is rated Medium

This tool creates or modifies cart data (applying discounts) without permanently deleting data. It is reversible—discount codes can be removed. While it affects financial calculations (discount amounts), the tool itself does not transfer money or create binding financial obligations; it merely applies pricing adjustments within a cart context. Therefore, it is categorized as Write rather than Financial.

From the tool's definition Tool name 'cart_add_discount_code' and description 'Add discount code' indicate the tool modifies cart state by adding a discount code, which is a reversible write operation that affects order totals and pricing.

The rule that runs cart_add_discount_code safely

PolicyLayer is an MCP gateway: it sits between your AI agents and MCP Dynamics 365 Commerce Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For cart_add_discount_code, this is the rule to start with:

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cart_add_discount_code": {
      "limits": [
        {
          "counter": "cart_add_discount_code_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

Questions about cart_add_discount_code