set_system_property

Create or update a ServiceNow system property value. [Write]

SERVERNowAIKit — ServiceNow AI Toolkit SOURCEnowaikit

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/nowaikit-servicenow-ai-toolkit/set-system-property.md

WHAT IT DOES

What set_system_property does on NowAIKit — ServiceNow AI Toolkit

AI agents use set_system_property 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.

RISK

Why set_system_property is rated Medium

This tool modifies ServiceNow system configuration by creating or updating system properties. While reversible (properties can be changed again), misuse could significantly alter instance behavior, affect security settings, disable features, or impact all users. The blast radius is organization-wide, justifying high severity.

From the tool's definition Tool description explicitly states 'Create or update a ServiceNow system property value' with **[Write]** label. System properties control ServiceNow instance behavior and configuration.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_system_property 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 set_system_property, this is the rule to start with:

set_system_property Rate-limited

set_system_property 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_system_property": {
      "limits": [
        {
          "counter": "set_system_property_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect NowAIKit — ServiceNow AI Toolkit, apply this rule, and every set_system_property call is checked against it from then on.

FAQ

Questions about set_system_property

What does the set_system_property tool do? +

Create or update a ServiceNow system property value. [Write]. 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.

How do I enforce a policy on set_system_property? +

Register the NowAIKit — ServiceNow AI Toolkit MCP server in PolicyLayer and add a rule for set_system_property: 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.

What risk level is set_system_property? +

set_system_property is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_system_property? +

Yes. Add a rate_limit block to the set_system_property 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 set_system_property completely? +

Set action: deny in the PolicyLayer policy for set_system_property. 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 set_system_property? +

set_system_property 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.

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