save_email_to_drive · Google MCP: Risk & Policy

WHAT IT DOES

What save_email_to_drive does on Google

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

WHY IT NEEDS A POLICY

Why save_email_to_drive needs a policy

This tool creates new data (an email file) in Google Drive storage. It is a Write operation because it persistently stores data in a way that can be undone by deletion or replacement. It is not Read (no query/retrieval), not Execute (no code/command execution), not Destructive (the original email and drive state remain intact; the operation is reversible), and not Financial.

From the tool's definition Tool performs 'Save an email as a file in Google Drive' — creates/stores a new file in cloud storage, which is reversible (the file can be deleted or modified later).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_email_to_drive Rate-limited

save_email_to_drive 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": {
    "save_email_to_drive": {
      "limits": [
        {
          "counter": "save_email_to_drive_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 Google, so you can run agents against it safely.

FAQ

Questions about save_email_to_drive

What does the save_email_to_drive tool do? +

Save an email as a file in Google Drive. It is categorised as a Write tool in the Google MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on save_email_to_drive? +

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

What risk level is save_email_to_drive? +

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

Can I rate-limit save_email_to_drive? +

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

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

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