group-chat

Fetch recent chat messages from a NIP-29 group.

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/group-chat.md

WHAT IT DOES

What group-chat does on Nostr Bray

AI agents call group-chat 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 group-chat is rated Low

This tool retrieves historical chat messages from a group without creating, modifying, deleting, or executing any operations. It is a straightforward read operation on existing data. The blast radius is minimal; misuse would at worst expose messages the agent already has access to view. Severity is low because this is passive data retrieval.

From the tool's definition Tool name 'group-chat' with description 'Fetch recent chat messages from a NIP-29 group.' — the verb 'Fetch' indicates data retrieval with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

group-chat Allowed

group-chat 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": {
    "group-chat": {}
  }
}

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 group-chat call is checked against it from then on.

FAQ

Questions about group-chat

What does the group-chat tool do? +

Fetch recent chat messages from a NIP-29 group. 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 group-chat? +

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

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

Can I rate-limit group-chat? +

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

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

group-chat 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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