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

WHAT IT DOES

What setRelayList does on Nostr Tools for AI Agents

AI agents use setRelayList 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 setRelayList needs a policy

This tool creates or modifies relay list configuration by publishing to the Nostr network (NIP-65 kind 10002 events). It is reversible—the user can update their relay list again later. The blast radius is medium because misconfiguration could disrupt the user's Nostr connectivity or expose them to relays they did not intend to use, but it does not delete data irreversibly or execute arbitrary code.

From the tool's definition Tool name 'setRelayList' and description 'Publish a relay list (NIP-65 kind 10002)' indicate creation/modification of Nostr relay configuration data. The verb 'Publish' confirms a write operation that modifies the user's relay list on the Nostr network.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

setRelayList Rate-limited

setRelayList 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": {
    "setRelayList": {
      "limits": [
        {
          "counter": "setrelaylist_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 setRelayList

What does the setRelayList tool do? +

Publish a relay list (NIP-65 kind 10002). 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 setRelayList? +

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

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

Can I rate-limit setRelayList? +

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

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

setRelayList 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.