create_client_script
Create a new client script (onLoad, onChange, onSubmit, onCellEdit) (requires SCRIPTING_ENABLED=true)
This record as markdown: /tools/nowaikit-servicenow-ai-toolkit/create-client-script.md
What create_client_script does on NowAIKit — ServiceNow AI Toolkit
AI agents use create_client_script to create or update resources in NowAIKit — ServiceNow AI Toolkit, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your NowAIKit — ServiceNow AI Toolkit environment.
Why create_client_script is rated Medium
This tool creates a new client script in ServiceNow. While it is a Write operation (creating a new record), client scripts execute JavaScript in users' browsers and can have significant security implications — they can exfiltrate data, manipulate UI behavior, or perform unauthorized actions on behalf of users. The severity is high due to the potential for malicious scripts to affect all users who load affected forms.
From the tool's definition 'Create a new client script' — creates a new artifact; requires SCRIPTING_ENABLED=true indicates it involves scripting capabilities
Attacks that exploit this kind of access
The rule that runs create_client_script safely
PolicyLayer is an MCP gateway: it sits between your AI agents and NowAIKit — ServiceNow AI Toolkit, 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 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.
The button opens the PolicyLayer dashboard: create your workspace, connect NowAIKit — ServiceNow AI Toolkit, apply this rule, and every create_client_script call is checked against it from then on.
Questions about create_client_script
Create a new client script (onLoad, onChange, onSubmit, onCellEdit) (requires SCRIPTING_ENABLED=true). It is categorised as a Write tool in the NowAIKit — ServiceNow AI Toolkit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the NowAIKit — ServiceNow AI Toolkit 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 NowAIKit — ServiceNow AI Toolkit. Nothing to install.
create_client_script is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
create_client_script is provided by the NowAIKit — ServiceNow AI Toolkit MCP server (nowaikit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on NowAIKit — ServiceNow AI Toolkit, and thousands of servers like it.
This server
Across the catalogue