snow_create_ui_page

Create custom UI Page with Jelly/HTML template and processing script

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-ui-page.md

WHAT IT DOES

What snow_create_ui_page does on Serac

AI agents use snow_create_ui_page 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_ui_page is rated Medium

This tool creates custom UI pages in ServiceNow with Jelly/HTML templates and processing scripts. This is a Write operation (create) that modifies the ServiceNow instance by adding new UI components. Severity is high because malicious UI pages could execute arbitrary code, perform XSS attacks, or redirect users, but the tool itself is reversible (pages can be deleted).

From the tool's definition Tool name 'snow_create_ui_page' and description 'Create custom UI Page with Jelly/HTML template and processing script' explicitly indicates creation of new UI artifacts with code templates.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs snow_create_ui_page 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_ui_page, this is the rule to start with:

snow_create_ui_page Rate-limited

snow_create_ui_page 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_ui_page": {
      "limits": [
        {
          "counter": "snow_create_ui_page_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_ui_page call is checked against it from then on.

FAQ

Questions about snow_create_ui_page

What does the snow_create_ui_page tool do? +

Create custom UI Page with Jelly/HTML template and processing script. 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_ui_page? +

Register the Serac MCP server in PolicyLayer and add a rule for snow_create_ui_page: 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_ui_page? +

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

Can I rate-limit snow_create_ui_page? +

Yes. Add a rate_limit block to the snow_create_ui_page 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_ui_page completely? +

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

snow_create_ui_page 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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