snow_add_comment · Serac MCP: Risk & Policy

WHAT IT DOES

What snow_add_comment does on Serac

AI agents use snow_add_comment 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_add_comment needs a policy

This tool modifies ServiceNow records by appending comments or work notes, which are reversible changes. It does not delete data (ruling out Destructive), execute arbitrary code (ruling out Execute), move money (ruling out Financial), or merely retrieve data (ruling out Read).

From the tool's definition Tool name 'snow_add_comment' and description 'Add comment/work note to record' indicate the tool creates new data (comments/work notes) within a ServiceNow record.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

snow_add_comment Rate-limited

snow_add_comment 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_add_comment": {
      "limits": [
        {
          "counter": "snow_add_comment_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_add_comment

What does the snow_add_comment tool do? +

Add comment/work note to record. 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_add_comment? +

Register the Serac MCP server in PolicyLayer and add a rule for snow_add_comment: 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_add_comment? +

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

Can I rate-limit snow_add_comment? +

Yes. Add a rate_limit block to the snow_add_comment 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_add_comment completely? +

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

snow_add_comment 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.

// THE FULL RECORD

snow_add_comment 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.

Teams ship this data inside their own products. See what a licence covers →