set_recurrence · MCP Apple Reminders MCP: Risk & Policy

WHAT IT DOES

What set_recurrence does on MCP Apple Reminders

AI agents use set_recurrence 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 set_recurrence needs a policy

set_recurrence modifies the recurrence schedule of existing reminders, making it a Write category tool (updates data reversibly). Severity is medium because misconfiguration could affect many future reminder notifications, but the change is reversible.

From the tool's definition Tool name 'set_recurrence' combined with server description stating the MCP server enables 'create, read, update, delete, search, and organization of reminders and lists'. The tool modifies reminder recurrence settings, which is a reversible update operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_recurrence Rate-limited

set_recurrence 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": {
    "set_recurrence": {
      "limits": [
        {
          "counter": "set_recurrence_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 set_recurrence

What does the set_recurrence tool do? +

set_recurrence. 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 set_recurrence? +

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

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

Can I rate-limit set_recurrence? +

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

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

set_recurrence 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.