AI agents call notes.list_folders 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 information about Notes folders with no side effects. It fits the Read category: a simple data retrieval/query operation. Severity is low because folder listing poses minimal risk even if accessed by an AI agent without authorization, as it only reveals organizational structure without exposing sensitive note content.
From the tool's definition Tool name includes 'list' and description states 'List Notes folders' - a query operation that retrieves folder metadata without modifying data.
Documented attack patterns abuse exactly the kind of access notes.list_folders 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 notes.list_folders:
{
"version": "1",
"default": "deny",
"tools": {
"notes.list_folders": {}
}
}notes.list_folders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List Notes folders. 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 notes.list_folders: 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.
notes.list_folders 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 notes.list_folders 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 notes.list_folders. 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.
notes.list_folders 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.