add_note · Simple MCP Server Tutorial MCP: Risk & Policy

WHAT IT DOES

What add_note does on Simple MCP Server Tutorial

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

WHY IT NEEDS A POLICY

Why add_note needs a policy

This tool creates new notes reversibly. It falls under Write category as it creates data that can be modified or deleted later. Severity is low because notes are typically non-critical data, and there are no financial, destructive, or code execution implications.

From the tool's definition Tool name 'add_note' and description 'Add a note with a title and content' indicate creation of new data without modification of existing records or destructive operations.

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 Simple MCP Server Tutorial, so you can run agents against it safely.

FAQ

Questions about add_note

What does the add_note tool do? +

Add a note with a title and content. It is categorised as a Write tool in the Simple MCP Server Tutorial 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 Simple MCP Server Tutorial 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 Simple MCP Server Tutorial. 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 Simple MCP Server Tutorial MCP server (xarsenicx/simple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

add_note is one line of Simple MCP Server Tutorial's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →