send_gmail_email

THE RISK

Medium Risk

Why send_gmail_email needs a policy

This tool creates and sends email messages via Gmail API. While emails cannot be technically 'unsent' after delivery in most cases, Gmail does offer a brief undo window (typically 5-30 seconds), making it reversible in the most immediate sense.

From the tool's definition Tool name 'send_gmail_email' and description 'Send an email using Gmail API' indicate creation and transmission of email messages, which is a reversible write operation.

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

POLICY

How to control send_gmail_email

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

policy.json

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

send_gmail_email 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 VaultAssist — 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

More VaultAssist tools

Destructive batch_delete_gmail_emails Delete multiple emails at once Destructive clear_completed_tasks Clear all completed tasks from a task list. The tasks will be marked as hidden Destructive delete_event Delete an event from a Google Calendar Destructive delete_gmail_email Delete an email by its message ID Destructive delete_gmail_label Delete a Gmail label Destructive delete_task Delete a task from a task list Destructive delete_task_list Delete a task list. Note: This will also delete all tasks in the list Destructive memory_delete_entities Delete and forget multiple entities and their associated relationships from the user

All 79 VaultAssist tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

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_email

What does the send_gmail_email tool do? +

Send an email using Gmail API with advanced options. It is categorised as a Write tool in the VaultAssist 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_email? +

Register the VaultAssist MCP server in PolicyLayer and add a rule for send_gmail_email: 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 VaultAssist. Nothing to install.

What risk level is send_gmail_email? +

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

Can I rate-limit send_gmail_email? +

Yes. Add a rate_limit block to the send_gmail_email 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_email completely? +

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

send_gmail_email is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VaultAssist tool call.

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

CHECK YOUR STACK →