create_uib_component · ServiceNow- MCP: Risk & Policy

WHAT IT DOES

What create_uib_component does on ServiceNow-MCP

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

WHY IT NEEDS A POLICY

Why create_uib_component needs a policy

This tool creates a new UI Builder component/macroponent in ServiceNow. Creation is a Write operation (reversible in principle). However, the [Scripting] tag indicates it may involve deploying custom code/scripts as part of the component, which elevates severity since malicious or buggy scripts embedded in UI components could affect all users interacting with those components.

From the tool's definition "Create a custom UI Builder component (macroponent)" and "[Scripting]" tag

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_uib_component Rate-limited

create_uib_component 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_uib_component": {
      "limits": [
        {
          "counter": "create_uib_component_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 ServiceNow-MCP, so you can run agents against it safely.

FAQ

Questions about create_uib_component

What does the create_uib_component tool do? +

Create a custom UI Builder component (macroponent). [Scripting]. It is categorised as a Write tool in the ServiceNow-MCP 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_uib_component? +

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

What risk level is create_uib_component? +

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

Can I rate-limit create_uib_component? +

Yes. Add a rate_limit block to the create_uib_component 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_uib_component completely? +

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

create_uib_component is provided by the ServiceNow- MCP server (tedorigawa001/servicenow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.