AI agents call drive_get_file_permissions to retrieve information from Google without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves file permission information from Google Drive. It performs a read-only operation with no side effects—it does not modify, delete, or create permissions, nor does it execute code or move money. The blast radius of misuse is low, as an agent could only learn about existing access patterns but cannot alter them.
From the tool's definition Tool name is 'drive_get_file_permissions' and description states 'Get file sharing permissions' — both indicate retrieval of existing permission data with no modification or deletion.
Attacks that exploit this kind of access
Get file sharing permissions. It is categorised as a Read tool in the Google MCP Server, which means it retrieves data without modifying state.
Register the Google MCP server in PolicyLayer and add a rule for drive_get_file_permissions: 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.
drive_get_file_permissions is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the drive_get_file_permissions 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_get_file_permissions. 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_get_file_permissions 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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