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

WHAT IT DOES

What postNote does on Nostr Tools for AI Agents

AI agents use postNote 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 postNote needs a policy

This tool creates and publishes content to a public distributed network (Nostr). While not destructive (content can theoretically be deleted via deleteEvent), it is a Write operation that creates persistent, distributed data. Severity is high because an AI agent misusing this could spam, impersonate, or flood the network with unwanted content at scale.

From the tool's definition Tool name 'postNote' and description 'Create, sign, and publish a text note (all-in-one)' indicate irreversible creation and publication of content to Nostr network.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

postNote Rate-limited

postNote 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": {
    "postNote": {
      "limits": [
        {
          "counter": "postnote_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 postNote

What does the postNote tool do? +

Create, sign, and publish a text note (all-in-one). 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 postNote? +

Register the Nostr Tools for AI Agents MCP server in PolicyLayer and add a rule for postNote: 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 postNote? +

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

Can I rate-limit postNote? +

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

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

postNote 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.

// THE FULL RECORD

postNote is one line of Nostr Tools for AI Agents'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 →