create_reminder · Apple Reminders MCP: Risk & Policy

WHAT IT DOES

What create_reminder does on Apple Reminders

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

WHY IT NEEDS A POLICY

Why create_reminder needs a policy

This tool creates new reminder entries in the macOS Reminders application. Creation is a reversible write operation (reminders can be deleted via delete_reminder). It does not execute arbitrary code, delete data irreversibly, or move money. Severity is medium because an agent could spam reminders or create misleading reminders, but the impact is contained to a single user's reminder list and is easily undone.

From the tool's definition Tool name is 'create_reminder' and server description states it exposes 'CRUD operations' including create. The Chinese description '创建一条提醒事项' translates to 'create a reminder item', confirming write semantics.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_reminder Rate-limited

create_reminder 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_reminder": {
      "limits": [
        {
          "counter": "create_reminder_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 Reminders, so you can run agents against it safely.

FAQ

Questions about create_reminder

What does the create_reminder tool do? +

创建一条提醒事项。. It is categorised as a Write tool in the Apple Reminders 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_reminder? +

Register the Apple Reminders MCP server in PolicyLayer and add a rule for create_reminder: 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 Reminders. Nothing to install.

What risk level is create_reminder? +

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

Can I rate-limit create_reminder? +

Yes. Add a rate_limit block to the create_reminder 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_reminder completely? +

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

create_reminder is provided by the Apple Reminders MCP server (yzheeng/apple-reminders-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.