listGmailLabels

THE RISK

Low Risk

Why listGmailLabels needs a policy

This tool performs a read-only retrieval of Gmail label information. It queries existing data structure without creating, modifying, deleting, or executing anything. The blast radius is minimal—an AI agent listing labels causes no harm and provides only organizational metadata. Low severity is appropriate for information retrieval operations with no side effects.

From the tool's definition Tool name 'listGmailLabels' and description 'List all Gmail labels (folders and categories)' indicate a query operation that retrieves metadata about labels without modification or side effects.

Documented attack patterns abuse exactly the kind of access listGmailLabels gives an agent:

POLICY

How to control listGmailLabels

PolicyLayer is an MCP gateway — it sits between your AI agents and Google Workspace MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for listGmailLabels:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "listGmailLabels": {}
  }
}

listGmailLabels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Google Workspace MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about listGmailLabels

What does the listGmailLabels tool do? +

List all Gmail labels (folders and categories). It is categorised as a Read tool in the Google Workspace MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on listGmailLabels? +

Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for listGmailLabels: 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 Workspace MCP Server. Nothing to install.

What risk level is listGmailLabels? +

listGmailLabels is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit listGmailLabels? +

Yes. Add a rate_limit block to the listGmailLabels 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.

How do I block listGmailLabels completely? +

Set action: deny in the PolicyLayer policy for listGmailLabels. 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.

What MCP server provides listGmailLabels? +

listGmailLabels is provided by the Google Workspace MCP Server MCP server (sputnicyoji/google-workspace-mcp-with-script). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google Workspace MCP Server tool call.

Start from Google Workspace MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →