uncomplete_reminder · MCP Apple Reminders MCP: Risk & Policy

WHAT IT DOES

What uncomplete_reminder does on MCP Apple Reminders

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

WHY IT NEEDS A POLICY

Why uncomplete_reminder needs a policy

Uncompleting a reminder is a write operation that modifies reminder state without destroying data or triggering external operations. It can be reversed by marking the reminder complete again. The blast radius is medium because an agent could maliciously uncomplete a large number of user reminders, but the damage is not permanent and easily recoverable by the user.

From the tool's definition Tool description states 'Mark a reminder as incomplete,' which modifies the state of an existing reminder. This is a reversible change to reminder data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

uncomplete_reminder Rate-limited

uncomplete_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": {
    "uncomplete_reminder": {
      "limits": [
        {
          "counter": "uncomplete_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 MCP Apple Reminders, so you can run agents against it safely.

FAQ

Questions about uncomplete_reminder

What does the uncomplete_reminder tool do? +

Mark a reminder as incomplete. It is categorised as a Write tool in the MCP 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 uncomplete_reminder? +

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

What risk level is uncomplete_reminder? +

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

Can I rate-limit uncomplete_reminder? +

Yes. Add a rate_limit block to the uncomplete_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 uncomplete_reminder completely? +

Set action: deny in the PolicyLayer policy for uncomplete_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 uncomplete_reminder? +

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