create_catalog_variable

[Write] Add a form variable to a service catalog item

SERVERNowAIKit — ServiceNow AI Toolkit SOURCEnowaikit

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/nowaikit-servicenow-ai-toolkit/create-catalog-variable.md

WHAT IT DOES

What create_catalog_variable does on NowAIKit — ServiceNow AI Toolkit

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

RISK

Why create_catalog_variable is rated Medium

The tool creates a new form variable in a catalog item, which is a reversible data modification. This is a Write operation. Severity is medium because misconfigured variables could affect business processes or user workflows, but the change is not destructive and does not directly move money or execute arbitrary code. Confidence is high based on the explicit [Write] prefix in the description.

From the tool's definition Tool description explicitly states '[Write] Add a form variable' — this creates new data in a ServiceNow service catalog.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_catalog_variable safely

PolicyLayer is an MCP gateway: it sits between your AI agents and NowAIKit — ServiceNow AI Toolkit, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_catalog_variable, this is the rule to start with:

create_catalog_variable Rate-limited

create_catalog_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_variable": {
      "limits": [
        {
          "counter": "create_catalog_variable_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect NowAIKit — ServiceNow AI Toolkit, apply this rule, and every create_catalog_variable call is checked against it from then on.

FAQ

Questions about create_catalog_variable

What does the create_catalog_variable tool do? +

[Write] Add a form variable to a service catalog item. It is categorised as a Write tool in the NowAIKit — ServiceNow AI Toolkit 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_variable? +

Register the NowAIKit — ServiceNow AI Toolkit MCP server in PolicyLayer and add a rule for create_catalog_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 NowAIKit — ServiceNow AI Toolkit. Nothing to install.

What risk level is create_catalog_variable? +

create_catalog_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_variable? +

Yes. Add a rate_limit block to the create_catalog_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_variable completely? +

Set action: deny in the PolicyLayer policy for create_catalog_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_variable? +

create_catalog_variable is provided by the NowAIKit — ServiceNow AI Toolkit MCP server (nowaikit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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