gmail_bulk_save_attachments

THE RISK

Medium Risk

Why gmail_bulk_save_attachments needs a policy

This tool retrieves email attachments and writes them to persistent storage. While it doesn't modify Gmail data itself, it creates new files on disk, which is a write operation. The severity is medium rather than high because the operation is reversible (files can be deleted) and the blast radius is limited to local filesystem storage.

From the tool's definition The tool 'saves multiple Gmail attachments to disk' — this is a write operation that creates files on the local filesystem. The description explicitly indicates data creation/persistence ('saves...to disk').

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

POLICY

How to control gmail_bulk_save_attachments

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

policy.json

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

gmail_bulk_save_attachments 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 MCP Google Workspace Server — 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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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 gmail_bulk_save_attachments

What does the gmail_bulk_save_attachments tool do? +

Saves multiple Gmail attachments to disk by their message IDs and attachment IDs in a single request. It is categorised as a Write tool in the MCP Google Workspace 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 gmail_bulk_save_attachments? +

Register the MCP Google Workspace Server MCP server in PolicyLayer and add a rule for gmail_bulk_save_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 MCP Google Workspace Server. Nothing to install.

What risk level is gmail_bulk_save_attachments? +

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

Can I rate-limit gmail_bulk_save_attachments? +

Yes. Add a rate_limit block to the gmail_bulk_save_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 gmail_bulk_save_attachments completely? +

Set action: deny in the PolicyLayer policy for gmail_bulk_save_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 gmail_bulk_save_attachments? +

gmail_bulk_save_attachments is provided by the MCP Google Workspace Server MCP server (j3k0/mcp-google-workspace). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Google Workspace Server tool call.

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

CHECK YOUR STACK →