AI agents call get-unread-emails to retrieve information from Gmail 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/queries email data with no side effects. It does not create, modify, delete, or execute operations—it only reads existing unread emails from the user's mailbox. The blast radius of misuse is low, as an AI agent could read emails but cannot alter them or perform other damaging actions with this tool alone.
From the tool's definition Tool name 'get-unread-emails' and description 'Retrieve unread emails' indicate a query operation that fetches email data without modification.
Documented attack patterns abuse exactly the kind of access get-unread-emails gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gmail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get-unread-emails:
{
"version": "1",
"default": "deny",
"tools": {
"get-unread-emails": {}
}
}get-unread-emails is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve unread emails. It is categorised as a Read tool in the Gmail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for get-unread-emails: 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 Gmail MCP Server. Nothing to install.
get-unread-emails 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 get-unread-emails 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 get-unread-emails. 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.
get-unread-emails is provided by the Gmail MCP Server MCP server (jasonsum/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gmail MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Gmail MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.