create_domain · TrekMail MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_domain does on TrekMail MCP Server

AI agents use create_domain 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_domain needs a policy

This tool creates a new domain resource in the email infrastructure, which is a write operation that modifies account configuration. It is reversible (domains can be removed), so it does not qualify as Destructive.

From the tool's definition Tool name 'create_domain' and description 'Add a new domain to the account' indicate creation of new infrastructure data that is reversible (domain can be deleted).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_domain Rate-limited

create_domain 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_domain": {
      "limits": [
        {
          "counter": "create_domain_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_domain

What does the create_domain tool do? +

Add a new domain to the account. The domain will start in pending_dns status. DNS records must be configured before it becomes active. 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_domain? +

Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for create_domain: 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_domain? +

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

Can I rate-limit create_domain? +

Yes. Add a rate_limit block to the create_domain 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_domain completely? +

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

create_domain 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.