List upcoming calendar events from Google Calendar. Specify the account ID, optional calendar ID, maximum number of results to return, and optional time range filters.
AI agents call list_events to retrieve information from Google Calendar MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries calendar event data without creating, modifying, or deleting any events. It has no side effects beyond data retrieval, making it a Read category tool. Severity is low because calendar event data exposure is generally low-risk unless the calendar contains highly sensitive business information, but the tool itself poses minimal risk regardless of misuse.
From the tool's definition Tool description states "List upcoming calendar events" with parameters for filtering. The verb "list" and function of retrieving calendar events without modification indicates a read-only operation.
Attacks that exploit this kind of access
List upcoming calendar events from Google Calendar. Specify the account ID, optional calendar ID, maximum number of results to return, and optional time range filters. It is categorised as a Read tool in the Google Calendar MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Calendar MCP Server MCP server in PolicyLayer and add a rule for list_events: 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 Server. Nothing to install.
list_events 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_events 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_events. 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_events is provided by the Google Calendar MCP Server MCP server (thisnick/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.
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