createNote · Nostr Tools for AI Agents MCP: Risk & Policy

WHAT IT DOES

What createNote does on Nostr Tools for AI Agents

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

WHY IT NEEDS A POLICY

Why createNote needs a policy

This tool creates a new note (writes data) but does not execute it or cause irreversible changes—the note is unsigned and not yet published to the Nostr network. The severity is medium because an AI agent misusing this tool could generate numerous false or malicious notes, but the unsigned state limits immediate impact. Confidence is high because the description clearly indicates data creation without side effects.

From the tool's definition Tool name 'createNote' and description 'Create an unsigned kind 1 text note' indicate creation of new data (a Nostr text note).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createNote Rate-limited

createNote 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": {
    "createNote": {
      "limits": [
        {
          "counter": "createnote_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 Nostr Tools for AI Agents, so you can run agents against it safely.

FAQ

Questions about createNote

What does the createNote tool do? +

Create an unsigned kind 1 text note. It is categorised as a Write tool in the Nostr Tools for AI Agents MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on createNote? +

Register the Nostr Tools for AI Agents MCP server in PolicyLayer and add a rule for createNote: 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 Nostr Tools for AI Agents. Nothing to install.

What risk level is createNote? +

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

Can I rate-limit createNote? +

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

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

createNote is provided by the Nostr Tools for AI Agents MCP server (jorgenclaw/nostr-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.