create_folder

Create a new IMAP folder in the mailbox. Folder names cannot use reserved names (INBOX, Sent, Drafts, Junk, Trash, Archive, Scheduled). To create a nested subfolder, pass

SERVERTrekMail MCP Server SOURCEtrekmail/mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trekmail-mcp-server/create-folder.md

WHAT IT DOES

What create_folder does on TrekMail MCP Server

AI agents use create_folder 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.

RISK

Why create_folder is rated Medium

The tool creates a new folder, which is a Write operation—it modifies the mailbox structure by adding data. It is not Destructive because folder creation is reversible (folders can be deleted). It is not Read, Execute, Financial, or Other. Severity is low because creating a folder has minimal blast radius and no direct impact on existing data or financial systems.

From the tool's definition Tool description states 'Create a new IMAP folder in the mailbox.' This is a reversible create operation that adds a new folder structure to email infrastructure.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_folder safely

PolicyLayer is an MCP gateway: it sits between your AI agents and TrekMail MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_folder, this is the rule to start with:

create_folder Rate-limited

create_folder 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_folder": {
      "limits": [
        {
          "counter": "create_folder_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TrekMail MCP Server, apply this rule, and every create_folder call is checked against it from then on.

FAQ

Questions about create_folder

What does the create_folder tool do? +

Create a new IMAP folder in the mailbox. Folder names cannot use reserved names (INBOX, Sent, Drafts, Junk, Trash, Archive, Scheduled). To create a nested subfolder, pass. 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_folder? +

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

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

Can I rate-limit create_folder? +

Yes. Add a rate_limit block to the create_folder 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_folder completely? +

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

create_folder 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.

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