snow_property_io · Serac MCP: Risk & Policy

WHAT IT DOES

What snow_property_io does on Serac

AI agents use snow_property_io 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.

WHY IT NEEDS A POLICY

Why snow_property_io needs a policy

The tool's import functionality creates or modifies system properties in ServiceNow, making it a Write operation. Export alone would be Read, but combined import capability elevates it to Write. The severity is high because system properties in ServiceNow control critical configurations (authentication, integrations, feature flags), and unauthorized modification could compromise system behavior and security.

From the tool's definition Tool performs 'System property I/O operations (import, export, history)' — import and export operations modify or extract system configuration data, which constitutes data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

snow_property_io Rate-limited

snow_property_io 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": {
    "snow_property_io": {
      "limits": [
        {
          "counter": "snow_property_io_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Serac, so you can run agents against it safely.

FAQ

Questions about snow_property_io

What does the snow_property_io tool do? +

System property I/O operations (import, export, history). 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.

How do I enforce a policy on snow_property_io? +

Register the Serac MCP server in PolicyLayer and add a rule for snow_property_io: 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.

What risk level is snow_property_io? +

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

Can I rate-limit snow_property_io? +

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

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

snow_property_io 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.