create_mailbox · MCP Mail Organizer MCP: Risk & Policy

WHAT IT DOES

What create_mailbox does on MCP Mail Organizer

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

WHY IT NEEDS A POLICY

Why create_mailbox needs a policy

This tool creates a new mailbox/folder, which is a reversible write operation that modifies email infrastructure by adding a new container. It does not retrieve data (Read), execute arbitrary code (Execute), irreversibly delete anything (Destructive), or move money (Financial).

From the tool's definition Tool name is 'create_mailbox' and description states 'Create a new mailbox/folder'. The action creates a new organizational structure within email infrastructure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_mailbox Rate-limited

create_mailbox 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_mailbox": {
      "limits": [
        {
          "counter": "create_mailbox_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 MCP Mail Organizer, so you can run agents against it safely.

FAQ

Questions about create_mailbox

What does the create_mailbox tool do? +

Create a new mailbox/folder. It is categorised as a Write tool in the MCP Mail Organizer 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_mailbox? +

Register the MCP Mail Organizer MCP server in PolicyLayer and add a rule for create_mailbox: 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 MCP Mail Organizer. Nothing to install.

What risk level is create_mailbox? +

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

Can I rate-limit create_mailbox? +

Yes. Add a rate_limit block to the create_mailbox 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_mailbox completely? +

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

create_mailbox is provided by the MCP Mail Organizer MCP server (neomody77/mcp-mail-organizer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.