add_admin · Campaign Monitor MCP: Risk & Policy

WHAT IT DOES

What add_admin does on Campaign Monitor MCP

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

WHY IT NEEDS A POLICY

Why add_admin needs a policy

This tool creates a new administrator account, which is a reversible Write operation (admins can be removed). However, the severity is high because granting admin access to an unauthorized person could enable widespread misuse of the Campaign Monitor account, including access to all campaign data, subscriber lists, and potentially financial settings.

From the tool's definition Tool name 'add_admin' and description 'Add a new administrator to the account' indicate creation of a new user/account role with elevated permissions.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_admin Rate-limited

add_admin 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_admin": {
      "limits": [
        {
          "counter": "add_admin_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 Campaign Monitor MCP, so you can run agents against it safely.

FAQ

Questions about add_admin

What does the add_admin tool do? +

Add a new administrator to the account. It is categorised as a Write tool in the Campaign Monitor 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_admin? +

Register the Campaign Monitor MCP server in PolicyLayer and add a rule for add_admin: 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 Campaign Monitor MCP. Nothing to install.

What risk level is add_admin? +

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

Can I rate-limit add_admin? +

Yes. Add a rate_limit block to the add_admin 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_admin completely? +

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

add_admin is provided by the Campaign Monitor MCP server (pauliowest/cmon-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.