modify_gmail_labels_tool

THE RISK

Medium Risk

Why modify_gmail_labels_tool needs a policy

The tool modifies Gmail labels, which are reversible changes to email metadata and organization. This is a Write operation (creates or modifies data reversibly) rather than Read (no side effects), Execute (arbitrary code), or Destructive (irreversible deletion). The empty description lowers confidence slightly, but the name clearly indicates label modification rather than message deletion or account compromise.

From the tool's definition Tool name 'modify_gmail_labels_tool' indicates modification of Gmail labels. In the context of an Apps Script MCP server that enables creation, management, and execution of scripts, this tool directly modifies email organization metadata.

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

POLICY

How to control modify_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 modify_gmail_labels_tool:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "modify_gmail_labels_tool": {
      "limits": [
        {
          "counter": "modify_gmail_labels_tool_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

modify_gmail_labels_tool stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

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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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about modify_gmail_labels_tool

What does the modify_gmail_labels_tool tool do? +

modify_gmail_labels_tool. It is categorised as a Write tool in the Apps Script MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on modify_gmail_labels_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for modify_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 modify_gmail_labels_tool? +

modify_gmail_labels_tool is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit modify_gmail_labels_tool? +

Yes. Add a rate_limit block to the modify_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 modify_gmail_labels_tool completely? +

Set action: deny in the PolicyLayer policy for modify_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 modify_gmail_labels_tool? +

modify_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 →