update_metaobject_definition · Shopify Graphql MCP

WHAT IT DOES

What update_metaobject_definition does on Shopify Graphql

AI agents use update_metaobject_definition 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 update_metaobject_definition needs a policy

This tool modifies existing metaobject definitions, which are reversible changes (definitions can be updated again or reverted). However, the severity is elevated to 'high' because updating metaobject definitions can have significant blast radius—changes to schema definitions could affect data validation, storage, and retrieval across multiple dependent resources and integrations in a Shopify store.

From the tool's definition Tool name is 'update_metaobject_definition' with description 'Update an existing metaobject definition'. The verb 'update' indicates modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_metaobject_definition Rate-limited

update_metaobject_definition 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": {
    "update_metaobject_definition": {
      "limits": [
        {
          "counter": "update_metaobject_definition_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 update_metaobject_definition

What does the update_metaobject_definition tool do? +

Update an existing metaobject definition. 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 update_metaobject_definition? +

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

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

Can I rate-limit update_metaobject_definition? +

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

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

update_metaobject_definition 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.