AI agents call google_gmail_list_labels to retrieve information from Google MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only retrieval of Gmail labels—standard metadata about the user's label organization. It has no side effects, creates no data, executes no code, and causes no irreversible changes. The blast radius of misuse is minimal: an attacker learns the user's label structure, which is low-sensitivity organizational information.
From the tool's definition Tool name 'google_gmail_list_labels' and description 'List all available Gmail labels' indicate a read-only query operation that retrieves existing label metadata with no modification or deletion.
Documented attack patterns abuse exactly the kind of access google_gmail_list_labels gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for google_gmail_list_labels:
{
"version": "1",
"default": "deny",
"tools": {
"google_gmail_list_labels": {}
}
}google_gmail_list_labels 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 MCP Server, which means it retrieves data without modifying state.
Register the Google MCP server in PolicyLayer and add a rule for google_gmail_list_labels: 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. Nothing to install.
google_gmail_list_labels 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 google_gmail_list_labels 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 google_gmail_list_labels. 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.
google_gmail_list_labels is provided by the Google MCP server (vakharwalad23/google-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google MCP, 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 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.