Create a new calendar event in Google Calendar. Provide the account ID, event summary, start and end times, and optionally a calendar ID, location, and description.
AI agents use create_event to create or update resources in Google Calendar MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Calendar MCP Server environment.
This tool creates new calendar events, which is a Write operation—it creates or modifies data reversibly. The severity is medium because misuse could cause schedule disruption, duplicate events, or calendar pollution, but the impact is limited to the user's own calendar and events can be deleted.
From the tool's definition Tool name is 'create_event' and description states 'Create a new calendar event in Google Calendar.' The action is to create new data (event) in the user's calendar, which is a reversible modification.
Attacks that exploit this kind of access
Create a new calendar event in Google Calendar. Provide the account ID, event summary, start and end times, and optionally a calendar ID, location, and description. It is categorised as a Write tool in the Google Calendar MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Calendar MCP Server MCP server in PolicyLayer and add a rule for create_event: 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.
create_event is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_event 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 create_event. 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.
create_event 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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