ensure_notes_folder_exists · Nextcloud Notes MCP

WHAT IT DOES

What ensure_notes_folder_exists does on Nextcloud Notes

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

WHY IT NEEDS A POLICY

Why ensure_notes_folder_exists needs a policy

This tool creates the /Notes folder if it doesn't already exist. It's a conditional write operation (create folder) that is reversible. It does not delete or overwrite data, execute code, or move money. Severity is low since it only creates a single known folder and has minimal blast radius.

From the tool's definition Ensure that the /Notes folder exists in Nextcloud

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ensure_notes_folder_exists Rate-limited

ensure_notes_folder_exists 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": {
    "ensure_notes_folder_exists": {
      "limits": [
        {
          "counter": "ensure_notes_folder_exists_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Nextcloud Notes, so you can run agents against it safely.

FAQ

Questions about ensure_notes_folder_exists

What does the ensure_notes_folder_exists tool do? +

Ensure that the /Notes folder exists in Nextcloud. It is categorised as a Write tool in the Nextcloud Notes MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ensure_notes_folder_exists? +

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

What risk level is ensure_notes_folder_exists? +

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

Can I rate-limit ensure_notes_folder_exists? +

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

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

ensure_notes_folder_exists is provided by the Nextcloud Notes MCP server (rncz/nextcloud-notes-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.