apple_reminders_update_list · Apple Reminders MCP

WHAT IT DOES

What apple_reminders_update_list does on Apple Reminders

AI agents use apple_reminders_update_list 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 apple_reminders_update_list needs a policy

This tool modifies existing reminder lists reversibly. It creates side effects (changes list properties) but does not delete data irreversibly or execute arbitrary code. The blast radius is medium because a misconfigured update could alter many reminders or list metadata, but changes can typically be reverted.

From the tool's definition Tool name contains 'update' and description states 'Update a list', indicating modification of existing data. Server description confirms 'CRUD operations' capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apple_reminders_update_list Rate-limited

apple_reminders_update_list 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": {
    "apple_reminders_update_list": {
      "limits": [
        {
          "counter": "apple_reminders_update_list_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 apple_reminders_update_list

What does the apple_reminders_update_list tool do? +

Update a list. 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 apple_reminders_update_list? +

Register the Apple Reminders MCP server in PolicyLayer and add a rule for apple_reminders_update_list: 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 apple_reminders_update_list? +

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

Can I rate-limit apple_reminders_update_list? +

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

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

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