create_client_script

Create a new client script (onLoad, onChange, onSubmit, onCellEdit) (requires SCRIPTING_ENABLED=true)

SERVERServiceNow-MCP SOURCEtedorigawa001/servicenow-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/tedorigawa001-servicenow-mcp/create-client-script.md

WHAT IT DOES

What create_client_script does on ServiceNow-MCP

AI agents invoke create_client_script to trigger actions in ServiceNow-MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why create_client_script is rated High

This tool creates executable JavaScript that runs in the ServiceNow client context on form events. While it 'creates' an artifact (Write), its primary risk is that the script executes in users' browsers on ServiceNow form interactions. Malicious or misconfigured client scripts can exfiltrate data, manipulate form behavior, or perform unauthorized actions at scale across all users who load affected forms.

From the tool's definition 'Create a new client script (onLoad, onChange, onSubmit, onCellEdit)' and 'requires SCRIPTING_ENABLED=true'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_client_script safely

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

create_client_script Rate-limited

create_client_script stays usable, but rate-capped: a runaway agent can't fire it dozens of times 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_client_script": {
      "limits": [
        {
          "counter": "create_client_script_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ServiceNow-MCP, apply this rule, and every create_client_script call is checked against it from then on.

FAQ

Questions about create_client_script

What does the create_client_script tool do? +

Create a new client script (onLoad, onChange, onSubmit, onCellEdit) (requires SCRIPTING_ENABLED=true). It is categorised as a Execute tool in the ServiceNow-MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on create_client_script? +

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

What risk level is create_client_script? +

create_client_script is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit create_client_script? +

Yes. Add a rate_limit block to the create_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 create_client_script completely? +

Set action: deny in the PolicyLayer policy for create_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 create_client_script? +

create_client_script 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.

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