approvals_approve · ServiceNow MCP Server MCP: Risk & Policy

WHAT IT DOES

What approvals_approve does on ServiceNow MCP Server

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

WHY IT NEEDS A POLICY

Why approvals_approve needs a policy

This is a Write operation because it modifies data (approval status) reversibly within ServiceNow's ITSM system. However, severity is high rather than medium because approvals often gate critical business processes—incidents, changes, asset procurement—and an AI agent autonomously approving requests could bypass necessary human oversight, create unauthorized incidents/changes, or approve financial purchases.

From the tool's definition Tool name 'approvals_approve' and description 'Approve an approval request' indicate this tool modifies approval workflow state in ServiceNow ITSM. It creates or commits a business decision with side effects (approval records are created/updated).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

approvals_approve Rate-limited

approvals_approve 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": {
    "approvals_approve": {
      "limits": [
        {
          "counter": "approvals_approve_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 Server, so you can run agents against it safely.

FAQ

Questions about approvals_approve

What does the approvals_approve tool do? +

Approve an approval request. It is categorised as a Write tool in the ServiceNow MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on approvals_approve? +

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

What risk level is approvals_approve? +

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

Can I rate-limit approvals_approve? +

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

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

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