createEvent · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What createEvent does on Gmail MCP Server

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

WHY IT NEEDS A POLICY

Why createEvent needs a policy

The tool creates reversible calendar data. While calendar events can affect scheduling and trigger notifications, the action is not destructive (events can be deleted), not financial (no money moves), and not execute-class (no arbitrary code execution). The severity is medium because unauthorized event creation could spam a calendar or cause scheduling conflicts, but can be undone by deletion.

From the tool's definition Tool description states 'Create a new calendar event' — this creates new data in the user's calendar without deletion or modification of existing records.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createEvent Rate-limited

createEvent 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": {
    "createEvent": {
      "limits": [
        {
          "counter": "createevent_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about createEvent

What does the createEvent tool do? +

Create a new calendar event. It is categorised as a Write tool in the Gmail MCP 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 createEvent? +

Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for createEvent: 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 Gmail MCP Server. Nothing to install.

What risk level is createEvent? +

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

Can I rate-limit createEvent? +

Yes. Add a rate_limit block to the createEvent 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 createEvent completely? +

Set action: deny in the PolicyLayer policy for createEvent. 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 createEvent? +

createEvent is provided by the Gmail MCP Server MCP server (zacco16/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.