List all calendars the user has access to
AI agents call calendar_listCalendars to retrieve information from Google MCP Remote without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves calendar metadata that the user already has access to. There are no side effects, no data modification, and no irreversible actions. The blast radius of misuse is minimal—an attacker gains visibility into calendar names and access scope, but cannot manipulate events or perform sensitive actions. This is a standard Read operation.
From the tool's definition Tool name is 'list' (retrieval operation) and description states 'List all calendars' with no modification, deletion, or execution mentioned. This is a simple enumeration of accessible calendars.
Documented attack patterns abuse exactly the kind of access calendar_listCalendars 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 calendar_listCalendars:
{
"version": "1",
"default": "deny",
"tools": {
"calendar_listCalendars": {}
}
}calendar_listCalendars is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all calendars the user has access to. It is categorised as a Read tool in the Google MCP Remote MCP Server, which means it retrieves data without modifying state.
Register the Google MCP Remote MCP server in PolicyLayer and add a rule for calendar_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 MCP Remote. Nothing to install.
calendar_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 calendar_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 calendar_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.
calendar_listCalendars 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.
Free to start. No card required.
35 Google MCP Remote tools catalogued and risk-classified — across an index of 43,000+ MCP servers.