snow_create_catalog_client_script

Creates client scripts for catalog items to add custom JavaScript behavior to forms.

SERVERSerac SOURCEserac-labs/serac

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/serac/snow-create-catalog-client-script.md

WHAT IT DOES

What snow_create_catalog_client_script does on Serac

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

RISK

Why snow_create_catalog_client_script is rated Medium

This tool creates new client-side scripts in ServiceNow, which is a reversible write operation. However, the severity is high because maliciously injected client scripts could compromise form data handling, intercept user input, exfiltrate sensitive information, or manipulate catalog submissions in ways that could affect business processes or user trust.

From the tool's definition Tool name includes 'create' and description states 'Creates client scripts for catalog items to add custom JavaScript behavior to forms.' This creates new code artifacts (client scripts) that modify form behavior.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs snow_create_catalog_client_script safely

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

snow_create_catalog_client_script Rate-limited

snow_create_catalog_client_script 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": {
    "snow_create_catalog_client_script": {
      "limits": [
        {
          "counter": "snow_create_catalog_client_script_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 Serac, apply this rule, and every snow_create_catalog_client_script call is checked against it from then on.

FAQ

Questions about snow_create_catalog_client_script

What does the snow_create_catalog_client_script tool do? +

Creates client scripts for catalog items to add custom JavaScript behavior to forms. It is categorised as a Write tool in the Serac MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on snow_create_catalog_client_script? +

Register the Serac MCP server in PolicyLayer and add a rule for snow_create_catalog_client_script: 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 Serac. Nothing to install.

What risk level is snow_create_catalog_client_script? +

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

Can I rate-limit snow_create_catalog_client_script? +

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

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

snow_create_catalog_client_script is provided by the Serac MCP server (serac-labs/serac). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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