relay-discover

Discover relays used by your contacts. Fetches kind 10002 (NIP-65) relay lists from your follow list,

SERVERNostr Bray SOURCEnostr-bray

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dev-forgesworn-bray/relay-discover.md

WHAT IT DOES

What relay-discover does on Nostr Bray

AI agents call relay-discover to retrieve information from Nostr Bray without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why relay-discover is rated Low

This tool queries and retrieves existing relay configuration data (NIP-65 relay lists) from contacts' public Nostr event kinds. It performs a read-only fetch operation with no ability to modify, delete, or execute actions. The low severity reflects that relay discovery is informational metadata about network infrastructure, not sensitive personal data or financial information.

From the tool's definition Tool name 'relay-discover' and description 'Fetches kind 10002 (NIP-65) relay lists from your follow list' indicate data retrieval with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs relay-discover safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Nostr Bray, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For relay-discover, this is the rule to start with:

relay-discover Allowed

relay-discover is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "relay-discover": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every relay-discover call is checked against it from then on.

FAQ

Questions about relay-discover

What does the relay-discover tool do? +

Discover relays used by your contacts. Fetches kind 10002 (NIP-65) relay lists from your follow list,. It is categorised as a Read tool in the Nostr Bray MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on relay-discover? +

Register the Nostr Bray MCP server in PolicyLayer and add a rule for relay-discover: 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 Bray. Nothing to install.

What risk level is relay-discover? +

relay-discover is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit relay-discover? +

Yes. Add a rate_limit block to the relay-discover 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 relay-discover completely? +

Set action: deny in the PolicyLayer policy for relay-discover. 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 relay-discover? +

relay-discover is provided by the Nostr Bray MCP server (nostr-bray). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Nostr Bray, and thousands of servers like it.

This server

All 240 Nostr Bray tools →

Across the catalogue

The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →