update_client_script

Update an existing client script (requires SCRIPTING_ENABLED=true)

SERVERServiceNow MCP Server SOURCE@aartiq/servicenow-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/servicenow-mcp-server/update-client-script.md

WHAT IT DOES

What update_client_script does on ServiceNow MCP Server

AI agents invoke update_client_script to trigger actions in ServiceNow MCP Server. 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 update_client_script is rated High

Client scripts contain executable JavaScript that runs in the ServiceNow client context. Updating a client script modifies code that will execute in users' browsers, making this an Execute-category action. Misuse could introduce malicious scripts affecting all users who trigger the script, giving it high severity.

From the tool's definition 'Update an existing client script' and 'requires SCRIPTING_ENABLED=true'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_client_script safely

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

update_client_script Rate-limited

update_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": {
    "update_client_script": {
      "limits": [
        {
          "counter": "update_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 Server, apply this rule, and every update_client_script call is checked against it from then on.

FAQ

Questions about update_client_script

What does the update_client_script tool do? +

Update an existing client script (requires SCRIPTING_ENABLED=true). It is categorised as a Execute tool in the ServiceNow MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on update_client_script? +

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

What risk level is update_client_script? +

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

Can I rate-limit update_client_script? +

Yes. Add a rate_limit block to the update_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 update_client_script completely? +

Set action: deny in the PolicyLayer policy for update_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 update_client_script? +

update_client_script is provided by the ServiceNow MCP Server MCP server (@aartiq/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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