AI agents use google_drive_share_file to create or update resources in Google MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google MCP environment.
Sharing a file creates or modifies access control metadata by adding a user to the shares list. This is a Write operation because it reversibly changes the file's sharing state and permissions.
From the tool's definition Tool name is 'google_drive_share_file' and description states 'Share a file with another user'. Sharing modifies file access permissions and metadata (shares list), which are reversible changes to data state.
Documented attack patterns abuse exactly the kind of access google_drive_share_file gives an agent:
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_drive_share_file:
{
"version": "1",
"default": "deny",
"tools": {
"google_drive_share_file": {
"limits": [
{
"counter": "google_drive_share_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}google_drive_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.
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Share a file with another user. It is categorised as a Write tool in the Google MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google MCP server in PolicyLayer and add a rule for google_drive_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 MCP. Nothing to install.
google_drive_share_file 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 google_drive_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.
Set action: deny in the PolicyLayer policy for google_drive_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.
google_drive_share_file 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.
Start from Google MCP, 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 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.