folders_ensure · Apple Notes MCP: Risk & Policy

WHAT IT DOES

What folders_ensure does on Apple Notes MCP

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

WHY IT NEEDS A POLICY

Why folders_ensure needs a policy

folders_ensure creates or modifies folder hierarchies reversibly. It does not delete data (ruling out Destructive), does not execute code or run queries (ruling out Execute), and does not move money (ruling out Financial). It is Write-category because it creates folders as a side effect.

From the tool's definition Tool creates nested folder paths: 'Create a nested folder path if it does not already exist.' This is a reversible creation operation that modifies the notes folder structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

folders_ensure Rate-limited

folders_ensure 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": {
    "folders_ensure": {
      "limits": [
        {
          "counter": "folders_ensure_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 Apple Notes MCP, so you can run agents against it safely.

FAQ

Questions about folders_ensure

What does the folders_ensure tool do? +

Create a nested folder path if it does not already exist. It is categorised as a Write tool in the Apple Notes MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on folders_ensure? +

Register the Apple Notes MCP server in PolicyLayer and add a rule for folders_ensure: 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 Apple Notes MCP. Nothing to install.

What risk level is folders_ensure? +

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

Can I rate-limit folders_ensure? +

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

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

folders_ensure is provided by the Apple Notes MCP server (renatoaraujo/apple-notes-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.