calendar_create_event

THE RISK

Medium Risk

Why calendar_create_event needs a policy

This tool creates calendar events, which is a reversible write operation. While events can be modified or deleted later, creating an event modifies the calendar state and could be misused to spam calendars, schedule malicious meetings, or interfere with a user's schedule.

From the tool's definition Tool name is 'calendar_create_event' and description states it 'Creates a new event in the specified Google Calendar.' The verb 'creates' indicates data modification.

Documented attack patterns abuse exactly the kind of access calendar_create_event gives an agent:

POLICY

How to control calendar_create_event

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_create_event:

policy.json

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

calendar_create_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.

Create a free account and register MCP Google Workspace Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Google Workspace Server tools

Destructive calendar_delete_event Deletes an event from the specified Google Calendar. Destructive gmail_delete_draft Deletes a Gmail draft message by its ID. This action cannot be undone. Write gmail_archive Archives a Gmail message by removing it from the inbox. Write gmail_bulk_archive Archives multiple Gmail messages by removing them from the inbox. Write gmail_bulk_save_attachments Saves multiple Gmail attachments to disk by their message IDs and attachment IDs in a sing Write gmail_create_draft Creates a draft email message from scratch in Gmail with specified recipient, subject, bod Read calendar_get_events Retrieves calendar events from the user\ Read calendar_list Lists all calendars accessible by the user. Call it before any other tool wheneve

All 16 MCP Google Workspace Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about calendar_create_event

What does the calendar_create_event tool do? +

Creates a new event in the specified Google Calendar. It is categorised as a Write tool in the MCP Google Workspace Server 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_create_event? +

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

What risk level is calendar_create_event? +

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

Can I rate-limit calendar_create_event? +

Yes. Add a rate_limit block to the calendar_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.

How do I block calendar_create_event completely? +

Set action: deny in the PolicyLayer policy for calendar_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.

What MCP server provides calendar_create_event? +

calendar_create_event 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.

Enforce policy on every MCP Google Workspace Server tool call.

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.

CHECK YOUR STACK →