AI agents use snow_create_catalog_client_script to create or update resources in Serac — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Serac environment.
This tool creates new client-side scripts in ServiceNow, which is a reversible write operation. However, the severity is high because maliciously injected client scripts could compromise form data handling, intercept user input, exfiltrate sensitive information, or manipulate catalog submissions in ways that could affect business processes or user trust.
From the tool's definition Tool name includes 'create' and description states 'Creates client scripts for catalog items to add custom JavaScript behavior to forms.' This creates new code artifacts (client scripts) that modify form behavior.
Attacks that exploit this kind of access
Creates client scripts for catalog items to add custom JavaScript behavior to forms. It is categorised as a Write tool in the Serac MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Serac MCP server in PolicyLayer and add a rule for snow_create_catalog_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 Serac. Nothing to install.
snow_create_catalog_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 snow_create_catalog_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 snow_create_catalog_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.
snow_create_catalog_client_script is provided by the Serac MCP server (serac-labs/serac). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
snow_create_catalog_client_script is one line of Serac's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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