create_contact_group · TrekMail MCP Server MCP

WHAT IT DOES

What create_contact_group does on TrekMail MCP Server

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

WHY IT NEEDS A POLICY

Why create_contact_group needs a policy

This tool creates a new contact group, which is a reversible data modification operation. It does not execute arbitrary code, delete data, move money, or cause destructive changes. The blast radius is medium because misconfigured contact groups could cause unintended email distribution, but the operation itself is reversible (the group can be deleted or modified).

From the tool's definition Tool name 'create_contact_group' and description 'Create a new contact group (distribution list)' indicate a create operation that adds new data to the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_contact_group Rate-limited

create_contact_group 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": {
    "create_contact_group": {
      "limits": [
        {
          "counter": "create_contact_group_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 TrekMail MCP Server, so you can run agents against it safely.

FAQ

Questions about create_contact_group

What does the create_contact_group tool do? +

Create a new contact group (distribution list). It is categorised as a Write tool in the TrekMail 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 create_contact_group? +

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

What risk level is create_contact_group? +

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

Can I rate-limit create_contact_group? +

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

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

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