Lists all calendars accessible by the user. Call it before any other tool whenever the user specifies a particular agenda (Family, Holidays, etc.). Returns detailed calendar metadata including access roles and timezone information.
AI agents call calendar_list to retrieve information from MCP Google Workspace Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves calendar metadata (names, access roles, timezone information) without creating, modifying, deleting, or executing any operations. It is a pure read operation with minimal security risk—the returned data reflects only the user's own calendar visibility and metadata.
From the tool's definition Tool name 'calendar_list' and description 'Lists all calendars accessible by the user' indicates data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access calendar_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Google Workspace Server, and nothing reaches the server without passing your rules. This is the rule we recommend for calendar_list:
{
"version": "1",
"default": "deny",
"tools": {
"calendar_list": {}
}
}calendar_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists all calendars accessible by the user. Call it before any other tool whenever the user specifies a particular agenda (Family, Holidays, etc.). Returns detailed calendar metadata including access roles and timezone information. It is categorised as a Read tool in the MCP Google Workspace Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Google Workspace Server MCP server in PolicyLayer and add a rule for calendar_list: 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 MCP Google Workspace Server. Nothing to install.
calendar_list 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_list 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_list. 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_list is provided by the MCP Google Workspace Server MCP server (j3k0/mcp-google-workspace). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Google Workspace Server, 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.
16 MCP Google Workspace Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.