calendar_create_event · Mcp Mac MCP: Risk & Policy

WHAT IT DOES

What calendar_create_event does on Mcp Mac

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

WHY IT NEEDS A POLICY

Why calendar_create_event needs a policy

This tool creates new calendar entries, which is a write operation (data creation/modification) rather than read-only access. While reversible (events can be deleted), it modifies user data and could cause calendar pollution, missed scheduling if wrong details are entered, or user disruption if an AI agent creates unwanted events.

From the tool's definition Tool name 'calendar_create_event' and description 'Create new calendar event' explicitly indicates creation of new data (calendar event) in the macOS Calendar application.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

calendar_create_event Rate-limited

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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about calendar_create_event

What does the calendar_create_event tool do? +

Create new calendar event. It is categorised as a Write tool in the Mcp Mac 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 Mac 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 Mac. 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 Mac MCP server (samicokar/mcp-mac). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.