snow_rate_limit · Serac MCP: Risk & Policy

WHAT IT DOES

What snow_rate_limit does on Serac

AI agents use snow_rate_limit 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_rate_limit needs a policy

This tool modifies system behavior by applying rate limiting policies. While not creating/deleting core data, it changes operational settings reversibly (rate limits can be adjusted or removed), making it a Write operation. Severity is medium because misconfigured rate limiting could degrade service availability but is not destructive or financial.

From the tool's definition Tool name 'snow_rate_limit' and description 'Apply rate limiting to operations' indicate modification of system configuration or operational parameters in ServiceNow.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

snow_rate_limit Rate-limited

snow_rate_limit 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_rate_limit": {
      "limits": [
        {
          "counter": "snow_rate_limit_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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_rate_limit

What does the snow_rate_limit tool do? +

Apply rate limiting to operations. 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_rate_limit? +

Register the Serac MCP server in PolicyLayer and add a rule for snow_rate_limit: 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_rate_limit? +

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

Can I rate-limit snow_rate_limit? +

Yes. Add a rate_limit block to the snow_rate_limit 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_rate_limit completely? +

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

snow_rate_limit 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.