notes_update · Apple Notes MCP: Risk & Policy

WHAT IT DOES

What notes_update does on Apple Notes MCP

AI agents use notes_update 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 notes_update needs a policy

This tool creates or modifies data in a reversible manner, which is the defining characteristic of the Write category. While it can replace content (replaceText, replaceHtml), these modifications can be undone by updating the note again, distinguishing it from Destructive operations.

From the tool's definition Tool performs 'Update a note title and exactly one content operation: replaceText, replaceHtml, or appendText' — modifies existing note data reversibly through title updates and content replacement/appending operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

notes_update Rate-limited

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

FAQ

Questions about notes_update

What does the notes_update tool do? +

Update a note title and exactly one content operation: replaceText, replaceHtml, or appendText. 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 notes_update? +

Register the Apple Notes MCP server in PolicyLayer and add a rule for notes_update: 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 notes_update? +

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

Can I rate-limit notes_update? +

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

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

notes_update 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.