calendar_duplicate_event · Google MCP: Risk & Policy

WHAT IT DOES

What calendar_duplicate_event does on Google

AI agents use calendar_duplicate_event to create or update resources in Google — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google environment.

WHY IT NEEDS A POLICY

Why calendar_duplicate_event needs a policy

Duplicating an event creates new data (a calendar event) in a reversible manner. This is a Write operation—data is created and can be modified or deleted later. The severity is medium because unintended calendar event duplication could cause scheduling confusion, missed meetings, or notification spam, but effects are reversible.

From the tool's definition Tool name 'calendar_duplicate_event' and description 'Duplicate an event to a new date/time' indicate creation of a new calendar event based on an existing one.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

calendar_duplicate_event Rate-limited

calendar_duplicate_event stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "calendar_duplicate_event": {
      "limits": [
        {
          "counter": "calendar_duplicate_event_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Google, so you can run agents against it safely.

FAQ

Questions about calendar_duplicate_event

What does the calendar_duplicate_event tool do? +

Duplicate an event to a new date/time. It is categorised as a Write tool in the Google MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on calendar_duplicate_event? +

Register the Google MCP server in PolicyLayer and add a rule for calendar_duplicate_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. Nothing to install.

What risk level is calendar_duplicate_event? +

calendar_duplicate_event is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit calendar_duplicate_event? +

Yes. Add a rate_limit block to the calendar_duplicate_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.

How do I block calendar_duplicate_event completely? +

Set action: deny in the PolicyLayer policy for calendar_duplicate_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.

What MCP server provides calendar_duplicate_event? +

calendar_duplicate_event is provided by the Google MCP server (robcerda/google-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.