List update sets on the instance with optional filtering.
AI agents call list_update_sets to retrieve information from Now Sdk Ext without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and lists existing update sets with optional filters, returning data without creating, modifying, executing, or deleting anything. It is a pure read operation with minimal security risk even if misused by an agent, as it only exposes metadata about update sets already present on the ServiceNow instance.
From the tool's definition Tool name 'list_update_sets' and description 'List update sets on the instance with optional filtering' indicate a retrieval operation with no data modification or execution.
Documented attack patterns abuse exactly the kind of access list_update_sets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Now Sdk Ext, and nothing reaches the server without passing your rules. This is the rule we recommend for list_update_sets:
{
"version": "1",
"default": "deny",
"tools": {
"list_update_sets": {}
}
}list_update_sets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List update sets on the instance with optional filtering. It is categorised as a Read tool in the Now Sdk Ext MCP Server, which means it retrieves data without modifying state.
Register the Now Sdk Ext MCP server in PolicyLayer and add a rule for list_update_sets: 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 Now Sdk Ext. Nothing to install.
list_update_sets is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_update_sets 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 list_update_sets. 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.
list_update_sets is provided by the Now Sdk Ext MCP server (sonisoft-cnanda/now-sdk-ext-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Now Sdk Ext, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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86 Now Sdk Ext tools catalogued and risk-classified — across an index of 43,000+ MCP servers.