AI agents call list_mailboxes to retrieve information from Apple Mail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
list_mailboxes retrieves or enumerates mailboxes without modifying state. It is a Read category tool with low severity because exposure allows only information disclosure about email account structure with minimal blast radius—no financial, destructive, or execution risks.
From the tool's definition Tool name 'list_mailboxes' indicates a query operation that retrieves mailbox information. No description provided, but context from sibling tools (compose_email, create_mailbox, export_emails, etc.) and server description emphasizing 'reading, searching,…
Documented attack patterns abuse exactly the kind of access list_mailboxes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Apple Mail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_mailboxes:
{
"version": "1",
"default": "deny",
"tools": {
"list_mailboxes": {}
}
}list_mailboxes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
list_mailboxes. It is categorised as a Read tool in the Apple Mail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Apple Mail MCP Server MCP server in PolicyLayer and add a rule for 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 Mail MCP Server. Nothing to install.
list_mailboxes is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the 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.
Set action: deny in the PolicyLayer policy for 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.
list_mailboxes is provided by the Apple Mail MCP Server MCP server (patrickfreyer/apple-mail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Apple Mail MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
26 Apple Mail MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.