list_gmail_labels_tool

THE RISK

Low Risk

Why list_gmail_labels_tool needs a policy

This tool retrieves/queries Gmail label information—a read-only operation with no side effects. It does not create, modify, delete, execute code, or move money. The blast radius of misuse is minimal (information disclosure of label names). Confidence is high because the description is explicit about the read-only nature of the operation.

From the tool's definition Tool name 'list_gmail_labels_tool' and description 'List all Gmail labels for the user' indicate a query operation that retrieves Gmail label metadata without modifying or executing code.

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

POLICY

How to control list_gmail_labels_tool

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

policy.json

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

list_gmail_labels_tool 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 Apps Script MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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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 list_gmail_labels_tool

What does the list_gmail_labels_tool tool do? +

List all Gmail labels for the user. It is categorised as a Read tool in the Apps Script MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_gmail_labels_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for list_gmail_labels_tool: 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 Apps Script MCP. Nothing to install.

What risk level is list_gmail_labels_tool? +

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

Can I rate-limit list_gmail_labels_tool? +

Yes. Add a rate_limit block to the list_gmail_labels_tool 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 list_gmail_labels_tool completely? +

Set action: deny in the PolicyLayer policy for list_gmail_labels_tool. 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 list_gmail_labels_tool? +

list_gmail_labels_tool is provided by the Apps Script MCP server (sam-ent/google-automation-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Apps Script MCP tool call.

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

CHECK YOUR STACK →