update_notebook · Jop MCP: Risk & Policy

WHAT IT DOES

What update_notebook does on Jopmcp

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

WHY IT NEEDS A POLICY

Why update_notebook needs a policy

This tool modifies notebook metadata or properties (title, parent, etc.) in a reversible manner. While it changes state, the action can be undone by updating again with different values. It does not execute arbitrary code, delete data, or involve financial transactions. The severity is medium because misuse could disrupt note organization or metadata, but the effects are not irreversible or destructive.

From the tool's definition Tool name 'update_notebook' and description 'Update an existing notebook in Joplin' indicate modification of existing data. The verb 'update' is reversible and does not permanently delete or destroy data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_notebook Rate-limited

update_notebook 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": {
    "update_notebook": {
      "limits": [
        {
          "counter": "update_notebook_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 Jopmcp, so you can run agents against it safely.

FAQ

Questions about update_notebook

What does the update_notebook tool do? +

Update an existing notebook in Joplin. It is categorised as a Write tool in the Jopmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_notebook? +

Register the Jop MCP server in PolicyLayer and add a rule for update_notebook: 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 Jopmcp. Nothing to install.

What risk level is update_notebook? +

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

Can I rate-limit update_notebook? +

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

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

update_notebook is provided by the Jop MCP server (jpfrancoia/jopmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.