group-send

Send a kind 9 message to exactly one NIP-29 group relay.

SERVERNostr Bray SOURCEnostr-bray

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dev-forgesworn-bray/group-send.md

WHAT IT DOES

What group-send does on Nostr Bray

AI agents use group-send to create or update resources in Nostr Bray, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nostr Bray environment.

RISK

Why group-send is rated Medium

This tool sends a message to a Nostr group relay, which creates or writes data (a message event) to the relay. It is not destructive (messages can be deleted or are ephemeral), not financial (no money movement), and not Execute (no arbitrary code execution—it sends a predetermined message type).

From the tool's definition Tool name contains 'send' and description states 'Send a kind 9 message to exactly one NIP-29 group relay.' Kind 9 messages in Nostr are group chat messages that create new data on the relay.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs group-send 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 group-send, this is the rule to start with:

group-send Rate-limited

group-send 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": {
    "group-send": {
      "limits": [
        {
          "counter": "group-send_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about group-send

What does the group-send tool do? +

Send a kind 9 message to exactly one NIP-29 group relay. It is categorised as a Write tool in the Nostr Bray MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on group-send? +

Register the Nostr Bray MCP server in PolicyLayer and add a rule for group-send: 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 group-send? +

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

Can I rate-limit group-send? +

Yes. Add a rate_limit block to the group-send 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 group-send completely? +

Set action: deny in the PolicyLayer policy for group-send. 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 group-send? +

group-send 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.

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