List all accessible Google Calendars for the authenticated user
AI agents call listCalendars to retrieve information from Google Drive MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns a list of calendars accessible to the user. It performs no writes, deletions, executions, or financial operations. The blast radius if misused by an AI agent is minimal—the user's calendar metadata would be enumerated but not altered. Classification as Read is appropriate.
From the tool's definition Tool name 'listCalendars' and description 'List all accessible Google Calendars' indicate a retrieval operation with no modification of data or side effects.
Documented attack patterns abuse exactly the kind of access listCalendars 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 listCalendars:
{
"version": "1",
"default": "deny",
"tools": {
"listCalendars": {}
}
}listCalendars is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List all accessible Google Calendars for the authenticated user. It is categorised as a Read tool in the Google Drive MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Drive MCP Server MCP server in PolicyLayer and add a rule for listCalendars: 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.
listCalendars 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 listCalendars 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 listCalendars. 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.
listCalendars 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.