AI agents call reminders.list_reminders to retrieve information from Nucleus Apple without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries reminder data from the user's Reminders app using native Apple APIs. The 'list' operation is explicitly a read-only action that applies filters to return existing reminders without creating, modifying, or deleting any data. No side effects occur beyond data retrieval.
From the tool's definition Tool name contains 'list' and description states 'List reminders by filters' — a query operation with no state modification.
Documented attack patterns abuse exactly the kind of access reminders.list_reminders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nucleus Apple, and nothing reaches the server without passing your rules. This is the rule we recommend for reminders.list_reminders:
{
"version": "1",
"default": "deny",
"tools": {
"reminders.list_reminders": {}
}
}reminders.list_reminders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List reminders by filters. It is categorised as a Read tool in the Nucleus Apple MCP Server, which means it retrieves data without modifying state.
Register the Nucleus Apple MCP server in PolicyLayer and add a rule for reminders.list_reminders: 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 Nucleus Apple. Nothing to install.
reminders.list_reminders is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the reminders.list_reminders 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.
Set action: deny in the PolicyLayer policy for reminders.list_reminders. 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.
reminders.list_reminders is provided by the Nucleus Apple MCP server (zish-rob-crur/nucleus-apple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nucleus Apple, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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30 Nucleus Apple tools catalogued and risk-classified — across an index of 43,000+ MCP servers.