google_gmail_download_attachments

THE RISK

Low Risk

Why google_gmail_download_attachments needs a policy

This tool retrieves and exports email attachment content. While it is fundamentally a Read operation (no data is created, modified, or deleted), the severity is elevated to medium because attachments may contain sensitive information (credentials, PII, financial records), and an AI agent misusing this could exfiltrate confidential data.

From the tool's definition Tool name and description indicate it 'Download all attachments from a specific email' — a retrieval operation with no modification of data.

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

POLICY

How to control google_gmail_download_attachments

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

policy.json

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

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

CAP 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.
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 google_gmail_download_attachments

What does the google_gmail_download_attachments tool do? +

Download all attachments from a specific email. It is categorised as a Read tool in the Google MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on google_gmail_download_attachments? +

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

What risk level is google_gmail_download_attachments? +

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

Can I rate-limit google_gmail_download_attachments? +

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

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

google_gmail_download_attachments is provided by the Google MCP server (vakharwalad23/google-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google MCP tool call.

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

CHECK YOUR STACK →