create_ui_action · ServiceNow- MCP: Risk & Policy

WHAT IT DOES

What create_ui_action does on ServiceNow-MCP

AI agents use create_ui_action 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_ui_action needs a policy

This tool creates new UI elements (buttons/links) on ServiceNow forms, which is a reversible modification of configuration data. While it enables scripting and could potentially be abused to inject malicious actions or circumvent controls, the primary action is Write—adding/creating UI components.

From the tool's definition Tool name is 'create_ui_action' and description states it 'Create[s] a new UI Action (button or link) on a form'. The requirement 'SCRIPTING_ENABLED=true' indicates this modifies form UI and enables script execution capabilities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_ui_action Rate-limited

create_ui_action 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_ui_action": {
      "limits": [
        {
          "counter": "create_ui_action_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_ui_action

What does the create_ui_action tool do? +

Create a new UI Action (button or link) on a form (requires SCRIPTING_ENABLED=true). 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_ui_action? +

Register the ServiceNow- MCP server in PolicyLayer and add a rule for create_ui_action: 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_ui_action? +

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

Can I rate-limit create_ui_action? +

Yes. Add a rate_limit block to the create_ui_action 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_ui_action completely? +

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

create_ui_action 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.