AI agents use drive_shareFile to create or update resources in Google MCP Remote — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google MCP Remote environment.
Sharing a file modifies its access control/permissions, which is a reversible write operation. However, the blast radius is high because an AI agent could inadvertently expose sensitive files to unintended recipients, potentially leaking confidential data stored in Google Drive.
From the tool's definition 'Share a file with a user' — grants access permissions to an existing file
Documented attack patterns abuse exactly the kind of access drive_shareFile gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google MCP Remote, and nothing reaches the server without passing your rules. This is the rule we recommend for drive_shareFile:
{
"version": "1",
"default": "deny",
"tools": {
"drive_shareFile": {
"limits": [
{
"counter": "drive_sharefile_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}drive_shareFile 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.
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Share a file with a user. It is categorised as a Write tool in the Google MCP Remote MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google MCP Remote MCP server in PolicyLayer and add a rule for drive_shareFile: 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 Remote. Nothing to install.
drive_shareFile is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the drive_shareFile 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.
Set action: deny in the PolicyLayer policy for drive_shareFile. 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.
drive_shareFile is provided by the Google MCP Remote MCP server (vakharwalad23/google-mcp-remote). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google MCP Remote, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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35 Google MCP Remote tools catalogued and risk-classified — across an index of 43,000+ MCP servers.