add_work_note · ServiceNow- MCP: Risk & Policy

WHAT IT DOES

What add_work_note does on ServiceNow-MCP

AI agents use add_work_note to create or update resources in ServiceNow-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ServiceNow-MCP environment.

WHY IT NEEDS A POLICY

Why add_work_note needs a policy

The tool creates new data (a work note) attached to ITSM records, which is a Write operation. The impact is moderate because work notes are internal documentation that can be edited or deleted later, and the blast radius is limited to a single record's notes section.

From the tool's definition Tool description states 'Add an internal work note to any ITSM record' and requires WRITE_ENABLED=true, indicating it creates or modifies data (the work note) within ServiceNow records. This is reversible content addition, not deletion or destruction.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_work_note Rate-limited

add_work_note 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": {
    "add_work_note": {
      "limits": [
        {
          "counter": "add_work_note_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 ServiceNow-MCP, so you can run agents against it safely.

FAQ

Questions about add_work_note

What does the add_work_note tool do? +

Add an internal work note to any ITSM record (requires WRITE_ENABLED=true). It is categorised as a Write tool in the ServiceNow-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_work_note? +

Register the ServiceNow- MCP server in PolicyLayer and add a rule for add_work_note: 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 ServiceNow-MCP. Nothing to install.

What risk level is add_work_note? +

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

Can I rate-limit add_work_note? +

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

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

add_work_note is provided by the ServiceNow- MCP server (tedorigawa001/servicenow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.