credit_gift_card · Shopify Graphql MCP: Risk & Policy

WHAT IT DOES

What credit_gift_card does on Shopify Graphql

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

WHY IT NEEDS A POLICY

Why credit_gift_card needs a policy

This tool modifies financial balances by adding credit to a gift card, which is a Write operation that increases store liability. While it involves money/value, it doesn't directly move funds or commit financial obligations externally — it adjusts an internal store credit balance. However, misuse could allow unauthorized credit to be issued at scale, making the blast radius high.

From the tool's definition Add credit to a gift card. Creates a credit transaction that increases the gift card balance.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

credit_gift_card Rate-limited

credit_gift_card stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

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 credit_gift_card

What does the credit_gift_card tool do? +

Add credit to a gift card. Creates a credit transaction that increases the gift card balance. It is categorised as a Write tool in the Shopify Graphql MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on credit_gift_card? +

Register the Shopify Graphql MCP server in PolicyLayer and add a rule for credit_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 credit_gift_card? +

credit_gift_card is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit credit_gift_card? +

Yes. Add a rate_limit block to the credit_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 credit_gift_card completely? +

Set action: deny in the PolicyLayer policy for credit_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 credit_gift_card? +

credit_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.