send_gmail_draft · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_gmail_draft does on Gmail MCP Server

AI agents use send_gmail_draft to create or update resources in Gmail MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Gmail MCP Server environment.

WHY IT NEEDS A POLICY

Why send_gmail_draft needs a policy

This tool creates and sends email messages, which are persistent data modifications. While not destructive (emails can be recalled/deleted), and not financial, sending emails on behalf of a user represents a high-severity write operation because it can communicate misinformation, leak sensitive data, or perform social engineering attacks if misused by an AI agent.

From the tool's definition Tool description states 'Send a previously created Gmail draft.' Sending emails is a write operation that creates new messages and initiates external communication with email recipients.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_gmail_draft Rate-limited

send_gmail_draft 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Gmail MCP Server, so you can run agents against it safely.

FAQ

Questions about send_gmail_draft

What does the send_gmail_draft tool do? +

Send a previously created Gmail draft. It is categorised as a Write tool in the Gmail MCP Server 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_draft? +

Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for send_gmail_draft: 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 Gmail MCP Server. Nothing to install.

What risk level is send_gmail_draft? +

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

Can I rate-limit send_gmail_draft? +

Yes. Add a rate_limit block to the send_gmail_draft 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_draft completely? +

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

send_gmail_draft is provided by the Gmail MCP Server MCP server (stevesimpson418/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.