create_calendar · Apple Calendar MCP Server MCP

WHAT IT DOES

What create_calendar does on Apple Calendar MCP Server

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

WHY IT NEEDS A POLICY

Why create_calendar needs a policy

Creating a calendar is a write operation that reversibly adds data to the system. It is not destructive (calendars and their contents can be deleted), not financial, and not code execution. While it modifies system state, the modification is standard data creation that can be undone.

From the tool's definition Tool creates a new calendar, adding reversible data to the calendar system. Description states 'Create a new calendar' which is a write operation that adds new organizational structure to the calendar system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_calendar Rate-limited

create_calendar 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": {
    "create_calendar": {
      "limits": [
        {
          "counter": "create_calendar_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 Apple Calendar MCP Server, so you can run agents against it safely.

FAQ

Questions about create_calendar

What does the create_calendar tool do? +

Create a new calendar. It is categorised as a Write tool in the Apple Calendar 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 create_calendar? +

Register the Apple Calendar MCP Server MCP server in PolicyLayer and add a rule for create_calendar: 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 Apple Calendar MCP Server. Nothing to install.

What risk level is create_calendar? +

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

Can I rate-limit create_calendar? +

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

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

create_calendar is provided by the Apple Calendar MCP Server MCP server (null-phnix/apple-calendar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.