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

WHAT IT DOES

What repostEvent does on Nostr Tools for AI Agents

AI agents use repostEvent 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 repostEvent needs a policy

This tool creates new data (a repost event) on the Nostr network, which is reversible (events can be deleted via deleteEvent). It does not execute arbitrary code or permanently destroy data. The blast radius is medium because a malicious agent could amplify misinformation or spam across the network by reposting inappropriate content, but the action is reversible and limited to the user's Nostr identity.

From the tool's definition "Repost an event (kind 6)" - reposting creates a new event on the Nostr network, modifying the user's activity and public presence by adding a new social action.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

repostEvent Rate-limited

repostEvent 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": {
    "repostEvent": {
      "limits": [
        {
          "counter": "repostevent_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 repostEvent

What does the repostEvent tool do? +

Repost an event (kind 6). 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 repostEvent? +

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

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

Can I rate-limit repostEvent? +

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

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

repostEvent 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.