update_client_basics · Campaign Monitor MCP: Risk & Policy

WHAT IT DOES

What update_client_basics does on Campaign Monitor MCP

AI agents use update_client_basics 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 update_client_basics needs a policy

This tool modifies existing client data reversibly without deleting or destroying it, placing it in the Write category. Severity is high because unauthorized updates to client account settings could disrupt email campaign operations, expose sensitive configuration, or compromise account security, though it does not directly cause financial loss or irreversible destruction.

From the tool's definition Tool name 'update_client_basics' with description 'Update a client' indicates modification of client account settings. The server description confirms it enables 'client/account settings' management through the Campaign Monitor API.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_client_basics Rate-limited

update_client_basics 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": {
    "update_client_basics": {
      "limits": [
        {
          "counter": "update_client_basics_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 update_client_basics

What does the update_client_basics tool do? +

Update a client. 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 update_client_basics? +

Register the Campaign Monitor MCP server in PolicyLayer and add a rule for update_client_basics: 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 update_client_basics? +

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

Can I rate-limit update_client_basics? +

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

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

update_client_basics 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.