List all calendars accessible by this account
AI agents call list_calendars to retrieve information from Google Calendar MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query operation that retrieves calendar metadata without modifying, deleting, or executing any actions. It is purely informational and poses minimal risk even if invoked by an AI agent, as it only surfaces existing calendar information that the authenticated account already has access to.
From the tool's definition Tool name 'list_calendars' and description 'List all calendars accessible by this account' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all calendars accessible by this account. It is categorised as a Read tool in the Google Calendar MCP MCP Server, which means it retrieves data without modifying state.
Register the Google Calendar MCP server in PolicyLayer and add a rule for list_calendars: 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 Calendar MCP. Nothing to install.
list_calendars 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 list_calendars 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 list_calendars. 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.
list_calendars is provided by the Google Calendar MCP server (paytience/google-calendar-mcp). 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.
Teams ship this data inside their own products. See what a licence covers →