List unread forwarded emails in Hermes's inbox, newest first.
AI agents call mail_list_pending to retrieve information from Hermes Google without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves existing email metadata (unread forwarded messages) without creating, modifying, deleting, or executing actions. It is purely informational. The blast radius of misuse is minimal—an agent querying emails cannot damage systems or cause financial harm. Severity is low because it accesses potentially sensitive personal email data, but the read-only nature limits risk.
From the tool's definition Tool name 'mail_list_pending' and description 'List unread forwarded emails' indicate retrieval and querying of data with no modification or side effects.
Attacks that exploit this kind of access
List unread forwarded emails in Hermes's inbox, newest first. It is categorised as a Read tool in the Hermes Google MCP Server, which means it retrieves data without modifying state.
Register the Hermes Google MCP server in PolicyLayer and add a rule for mail_list_pending: 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 Hermes Google. Nothing to install.
mail_list_pending 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 mail_list_pending 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 mail_list_pending. 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.
mail_list_pending is provided by the Hermes Google MCP server (jimmy-larsson/hermes-google). 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.
Teams ship this data inside their own products. See what a licence covers →