addContactToList · Mailmodo MCP: Risk & Policy

WHAT IT DOES

What addContactToList does on Mailmodo

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

WHY IT NEEDS A POLICY

Why addContactToList needs a policy

The tool creates or modifies a contact's list membership, which is reversible (contacts can be removed). This is a Write category operation. Severity is medium because an agent could spam-list users or add contacts without consent, but the effect is not destructive and doesn't involve financial operations. The presence of complementary tools like 'removeContactFromList' confirms this is reversible.

From the tool's definition Tool name 'addContactToList' combined with description 'Add Contact to list' indicates creation/modification of contact list membership. This is a data modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

addContactToList Rate-limited

addContactToList 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": {
    "addContactToList": {
      "limits": [
        {
          "counter": "addcontacttolist_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 Mailmodo, so you can run agents against it safely.

FAQ

Questions about addContactToList

What does the addContactToList tool do? +

Add Contact to list. It is categorised as a Write tool in the Mailmodo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on addContactToList? +

Register the Mailmodo MCP server in PolicyLayer and add a rule for addContactToList: 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 Mailmodo. Nothing to install.

What risk level is addContactToList? +

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

Can I rate-limit addContactToList? +

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

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

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