AI agents use addPermission to create or update resources in Google Drive MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Drive MCP Server environment.
This tool modifies file metadata and access controls by adding sharing permissions. While reversible (unlike deletion), it has high blast radius because an AI agent could inadvertently grant broad access to sensitive Google Drive files—potentially exposing confidential documents, spreadsheets, or other sensitive data to unintended recipients.
From the tool's definition Tool name 'addPermission' and description 'Add a sharing permission to a file' indicate modification of file access controls. This creates new access grants that are reversible (permissions can be removed).
Documented attack patterns abuse exactly the kind of access addPermission gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Drive MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for addPermission:
{
"version": "1",
"default": "deny",
"tools": {
"addPermission": {
"limits": [
{
"counter": "addpermission_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}addPermission 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.
Free to start. No card required.
Add a sharing permission to a file. It is categorised as a Write tool in the Google Drive MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Drive MCP Server MCP server in PolicyLayer and add a rule for addPermission: 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 Drive MCP Server. Nothing to install.
addPermission 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 addPermission 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 addPermission. 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.
addPermission is provided by the Google Drive MCP Server MCP server (piotr-agier/google-drive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 107 Google Drive MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
107 Google Drive MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.