list_messages

List messages in a mailbox IMAP folder, sorted newest-first with cursor-based pagination. Requires a message token with messages:read scope.

SERVERTrekMail MCP Server SOURCEtrekmail/mcp-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trekmail-mcp-server/list-messages.md

WHAT IT DOES

What list_messages does on TrekMail MCP Server

AI agents call list_messages to retrieve information from TrekMail MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_messages is rated Low

This tool retrieves and queries message data from an IMAP folder with cursor-based pagination. It performs no modifications, deletions, or external operations—purely a read operation on email messages. The low severity reflects minimal blast radius: an agent misusing this would at worst read emails it shouldn't, but cannot alter, delete, or send messages.

From the tool's definition Tool description explicitly states it 'List messages in a mailbox IMAP folder' and requires 'messages:read scope'. The word 'List' indicates a retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_messages 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 list_messages, this is the rule to start with:

list_messages Allowed

list_messages is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY 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 list_messages call is checked against it from then on.

FAQ

Questions about list_messages

What does the list_messages tool do? +

List messages in a mailbox IMAP folder, sorted newest-first with cursor-based pagination. Requires a message token with messages:read scope. It is categorised as a Read tool in the TrekMail MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_messages? +

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

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

Can I rate-limit list_messages? +

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

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

list_messages 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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