AI agents call notes.list_accounts 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.
The tool queries and returns a list of existing Notes accounts without creating, modifying, deleting, or executing any actions. This is a straightforward read operation with minimal risk; misuse would only expose account metadata already accessible to the user on their macOS system.
From the tool's definition Tool name and description explicitly indicate 'List Notes accounts' — a retrieval operation with no side effects or data modification.
Documented attack patterns abuse exactly the kind of access notes.list_accounts 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_accounts:
{
"version": "1",
"default": "deny",
"tools": {
"notes.list_accounts": {}
}
}notes.list_accounts 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 accounts. 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_accounts: 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_accounts 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_accounts 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_accounts. 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_accounts 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.
Free to start. No card required.
30 Nucleus Apple tools catalogued and risk-classified — across an index of 43,000+ MCP servers.