confirm_share_file · Google MCP: Risk & Policy

WHAT IT DOES

What confirm_share_file does on Google

AI agents use confirm_share_file 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 confirm_share_file needs a policy

Sharing a file modifies its access control metadata and visibility settings. While reversible (sharing can be undone), it is not a simple read operation and does not delete data. The severity is medium rather than high because sharing is typically constrained by organizational policies and the user's existing permissions, though it could expose sensitive data if misused on confidential files.

From the tool's definition The tool performs a sharing operation that modifies access control and properties of a file. The description 'Confirm and share the prepared file' indicates it creates or modifies permissions/sharing settings on existing data, which is a reversible write…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

confirm_share_file Rate-limited

confirm_share_file 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": {
    "confirm_share_file": {
      "limits": [
        {
          "counter": "confirm_share_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 confirm_share_file

What does the confirm_share_file tool do? +

✅ Confirm and share the prepared file. 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 confirm_share_file? +

Register the Google MCP server in PolicyLayer and add a rule for confirm_share_file: 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 confirm_share_file? +

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

Can I rate-limit confirm_share_file? +

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

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

confirm_share_file 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.