create_price_rule · Shopify Graphql MCP: Risk & Policy

WHAT IT DOES

What create_price_rule does on Shopify Graphql

AI agents use create_price_rule 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 create_price_rule needs a policy

This tool creates a new price rule (discount configuration) which modifies store data reversibly. While price rules affect financial transactions (discounts), the tool itself does not move money or commit financial obligations—it merely configures discount logic. The action is reversible (price rules can be deleted or modified).

From the tool's definition Tool name 'create_price_rule' and description 'Create a new price rule for automatic discounts' indicate creation of a new discount configuration object in Shopify.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_price_rule Rate-limited

create_price_rule 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": {
    "create_price_rule": {
      "limits": [
        {
          "counter": "create_price_rule_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 create_price_rule

What does the create_price_rule tool do? +

Create a new price rule for automatic discounts. 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 create_price_rule? +

Register the Shopify Graphql MCP server in PolicyLayer and add a rule for create_price_rule: 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 create_price_rule? +

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

Can I rate-limit create_price_rule? +

Yes. Add a rate_limit block to the create_price_rule 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 create_price_rule completely? +

Set action: deny in the PolicyLayer policy for create_price_rule. 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 create_price_rule? +

create_price_rule 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.