send_gmail_message_tool

THE RISK

Medium Risk

Why send_gmail_message_tool needs a policy

Sending emails creates new data (messages) and has side effects that are difficult to fully undo—once sent, recipients receive and may act on the message. This is Write rather than Execute because email transmission is primarily a data creation action rather than arbitrary code execution.

From the tool's definition Tool name is 'send_gmail_message_tool' indicating it sends email messages via Gmail. The Apps Script server description states it enables users to 'create, manage, and execute Google Apps Script projects' and the sibling tools include email-related…

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

POLICY

How to control send_gmail_message_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 send_gmail_message_tool:

policy.json

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

send_gmail_message_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 →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 60 Apps Script MCP tools →

Write tools on other servers

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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 send_gmail_message_tool

What does the send_gmail_message_tool tool do? +

send_gmail_message_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 send_gmail_message_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for send_gmail_message_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 send_gmail_message_tool? +

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

Can I rate-limit send_gmail_message_tool? +

Yes. Add a rate_limit block to the send_gmail_message_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 send_gmail_message_tool completely? +

Set action: deny in the PolicyLayer policy for send_gmail_message_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 send_gmail_message_tool? +

send_gmail_message_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 →