create_catalog_item_variable · ServiceNow MCP Server MCP

WHAT IT DOES

What create_catalog_item_variable does on ServiceNow MCP Server

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

WHY IT NEEDS A POLICY

Why create_catalog_item_variable needs a policy

This tool creates new catalog form fields, which modifies the structure of service catalog items but does not delete data, execute code, or move money. The change is reversible (fields can be deleted or modified later).

From the tool's definition Tool name 'create_catalog_item_variable' and description 'Create a new variable (form field) for a catalog item' indicate data creation/modification. This adds a new form field to a service catalog item, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_catalog_item_variable Rate-limited

create_catalog_item_variable 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_catalog_item_variable": {
      "limits": [
        {
          "counter": "create_catalog_item_variable_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about create_catalog_item_variable

What does the create_catalog_item_variable tool do? +

Create a new variable (form field) for a catalog item. It is categorised as a Write tool in the ServiceNow MCP Server 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_catalog_item_variable? +

Register the ServiceNow MCP Server MCP server in PolicyLayer and add a rule for create_catalog_item_variable: 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 ServiceNow MCP Server. Nothing to install.

What risk level is create_catalog_item_variable? +

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

Can I rate-limit create_catalog_item_variable? +

Yes. Add a rate_limit block to the create_catalog_item_variable 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_catalog_item_variable completely? +

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

create_catalog_item_variable is provided by the ServiceNow MCP Server MCP server (shameerampcome/servicenow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.