AI agents call listEmails to retrieve information from Mail MCP Tool without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
listEmails retrieves and queries email data without side effects. There is no indication it modifies, deletes, or executes operations—it simply lists emails. This is characteristic of Read category tools. The empty description slightly reduces confidence, but the name itself is clear and unambiguous.
From the tool's definition Tool name 'listEmails' indicates retrieval of email list data with no modification capability. Server context shows it is part of an email tool offering various operations including read-only operations (listFolders, getEmailDetail, getAttachment) alongside…
Documented attack patterns abuse exactly the kind of access listEmails gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mail MCP Tool, and nothing reaches the server without passing your rules. This is the rule we recommend for listEmails:
{
"version": "1",
"default": "deny",
"tools": {
"listEmails": {}
}
}listEmails is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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listEmails. It is categorised as a Read tool in the Mail MCP Tool MCP Server, which means it retrieves data without modifying state.
Register the Mail MCP Tool MCP server in PolicyLayer and add a rule for listEmails: 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 Mail MCP Tool. Nothing to install.
listEmails 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 listEmails 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 listEmails. 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.
listEmails is provided by the Mail MCP Tool MCP server (shuakami/mcp-mail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 Mail MCP Tool tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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17 Mail MCP Tool tools catalogued and risk-classified — across an index of 42,500+ MCP servers.