AI agents call gmail_listLabels to retrieve information from Google MCP Remote without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward read operation that enumerates Gmail labels. It has no side effects, does not modify data, and returns only information about label configuration. The blast radius of misuse is minimal—an attacker could enumerate labels to understand email organization, but cannot access email contents, send messages, or alter account state through this tool alone.
From the tool's definition Tool name 'gmail_listLabels' and description 'List all available Gmail labels' indicate a query operation that retrieves label metadata without modifying any data.
Documented attack patterns abuse exactly the kind of access gmail_listLabels gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google MCP Remote, and nothing reaches the server without passing your rules. This is the rule we recommend for gmail_listLabels:
{
"version": "1",
"default": "deny",
"tools": {
"gmail_listLabels": {}
}
}gmail_listLabels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available Gmail labels. It is categorised as a Read tool in the Google MCP Remote MCP Server, which means it retrieves data without modifying state.
Register the Google MCP Remote MCP server in PolicyLayer and add a rule for gmail_listLabels: 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 Google MCP Remote. Nothing to install.
gmail_listLabels 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 gmail_listLabels 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 gmail_listLabels. 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.
gmail_listLabels is provided by the Google MCP Remote MCP server (vakharwalad23/google-mcp-remote). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google MCP Remote, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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35 Google MCP Remote tools catalogued and risk-classified — across an index of 43,000+ MCP servers.