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

WHAT IT DOES

What reactToEvent does on Nostr Tools for AI Agents

AI agents use reactToEvent 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 reactToEvent needs a policy

This tool creates and publishes data (a reaction event) to a decentralized network. While reactions are reversible through deleteEvent and do not involve financial transactions or irreversible destruction, they permanently broadcast user-generated content to Nostr relays.

From the tool's definition Tool creates a new event (kind 7 reaction event) on the Nostr protocol. The description indicates it 'React to an event (kind 7)', which in Nostr publishes a new reaction event to the network—a creation/modification action with side effects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reactToEvent Rate-limited

reactToEvent 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": {
    "reactToEvent": {
      "limits": [
        {
          "counter": "reacttoevent_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 reactToEvent

What does the reactToEvent tool do? +

React to an event (kind 7). 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 reactToEvent? +

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

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

Can I rate-limit reactToEvent? +

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

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

reactToEvent 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.