List messages in a mailbox IMAP folder, sorted newest-first with cursor-based pagination. Requires a message token with messages:read scope.
AI agents call list_messages to retrieve information from TrekMail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
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
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.
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.
list_messages 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_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.
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.
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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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