email_list_mailboxes

THE RISK

Low Risk

Why email_list_mailboxes needs a policy

This tool queries and returns information about existing mailbox structure and message counts. It performs no write, delete, or execution operations. The action is purely informational retrieval with no side effects. Severity is low as mailbox structure metadata poses minimal risk even if exposed to an AI agent.

From the tool's definition Tool name 'email_list_mailboxes' and description 'List all email folders/mailboxes with message counts' indicate retrieval of metadata about email storage structure with no modification or deletion.

Documented attack patterns abuse exactly the kind of access email_list_mailboxes gives an agent:

POLICY

How to control email_list_mailboxes

PolicyLayer is an MCP gateway — it sits between your AI agents and Apple Shortcuts, and nothing reaches the server without passing your rules. This is the rule we recommend for email_list_mailboxes:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "email_list_mailboxes": {}
  }
}

email_list_mailboxes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Apple Shortcuts — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about email_list_mailboxes

What does the email_list_mailboxes tool do? +

List all email folders/mailboxes with message counts. It is categorised as a Read tool in the Apple Shortcuts MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on email_list_mailboxes? +

Register the Apple Shortcuts MCP server in PolicyLayer and add a rule for email_list_mailboxes: 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 Apple Shortcuts. Nothing to install.

What risk level is email_list_mailboxes? +

email_list_mailboxes is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit email_list_mailboxes? +

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

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

email_list_mailboxes is provided by the Apple Shortcuts MCP server (@mindstone/mcp-server-apple-shortcuts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Apple Shortcuts tool call.

Start from Apple Shortcuts, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →