debit_gift_card · Shopify Graphql MCP: Risk & Policy

WHAT IT DOES

What debit_gift_card does on Shopify Graphql

AI agents use debit_gift_card to commit financial operations through Shopify Graphql — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why debit_gift_card needs a policy

This tool moves financial value by debiting (deducting) a monetary balance from a gift card, which constitutes a financial transaction. Misuse could result in unauthorized depletion of customer gift card balances, making it high severity.

From the tool's definition Debit (deduct) from a gift card. Creates a debit transaction that decreases the gift card balance.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

debit_gift_card Approval-gated

Any call to debit_gift_card is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "debit_gift_card": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Shopify Graphql, so you can run agents against it safely.

FAQ

Questions about debit_gift_card

What does the debit_gift_card tool do? +

Debit (deduct) from a gift card. Creates a debit transaction that decreases the gift card balance. It is categorised as a Financial tool in the Shopify Graphql MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on debit_gift_card? +

Register the Shopify Graphql MCP server in PolicyLayer and add a rule for debit_gift_card: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Shopify Graphql. Nothing to install.

What risk level is debit_gift_card? +

debit_gift_card is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit debit_gift_card? +

Yes. Add a rate_limit block to the debit_gift_card rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block debit_gift_card completely? +

Set action: deny in the PolicyLayer policy for debit_gift_card. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides debit_gift_card? +

debit_gift_card is provided by the Shopify Graphql MCP server (uvu-store/shopify-graphql-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.