add_note · MCP-server MCP: Risk & Policy

WHAT IT DOES

What add_note does on MCP-server

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

WHY IT NEEDS A POLICY

Why add_note needs a policy

This tool creates new data (a note) in a file without destructive side effects. The action is reversible—notes can be edited or deleted later. No code execution, financial transactions, or irreversible data loss occurs. This is a straightforward Write operation with minimal blast radius; misuse would result in unwanted notes being added but no system compromise or data loss.

From the tool's definition Tool appends a new note to a sticky note file, which creates/modifies data reversibly without deleting or overwriting existing content.

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 MCP-server, so you can run agents against it safely.

FAQ

Questions about add_note

What does the add_note tool do? +

Append a new note to the sticky note file. It is categorised as a Write tool in the 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 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 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 MCP-server MCP server (prathapmahi/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.