add_note · Notes MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_note does on Notes MCP Server

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

WHY IT NEEDS A POLICY

Why add_note needs a policy

This tool creates new notes in a local JSON file, which is a reversible write operation. The data can be modified or deleted later. There is no destructive action, code execution, financial impact, or reading of sensitive data. Severity is low because notes are typically user-controlled personal data with minimal blast radius if misused by an AI agent.

From the tool's definition Tool name 'add_note' and description 'Save a new note' indicate creation of new data in a persistent JSON file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_note Rate-limited

add_note 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": {
    "add_note": {
      "limits": [
        {
          "counter": "add_note_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 Notes MCP Server, so you can run agents against it safely.

FAQ

Questions about add_note

What does the add_note tool do? +

Save a new note. It is categorised as a Write tool in the Notes MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_note? +

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

What risk level is add_note? +

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

Can I rate-limit add_note? +

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

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

add_note is provided by the Notes MCP Server MCP server (prem2230/mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.