listing-create

Create a classified listing (NIP-99, kind 30402). Publishes a replaceable event with title,

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/listing-create.md

WHAT IT DOES

What listing-create does on Nostr Bray

AI agents use listing-create 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 listing-create is rated Medium

This tool creates and publishes a new classified listing event to Nostr, which modifies the network state by adding a new, replaceable event. This is reversible (the event can be replaced or superseded by publishing a new version with the same kind/pubkey, per NIP-99 semantics), so it falls under Write rather than Destructive.

From the tool's definition 'Create a classified listing' and 'Publishes a replaceable event' indicate the tool creates and publishes new data to a Nostr network.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs listing-create 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 listing-create, this is the rule to start with:

listing-create Rate-limited

listing-create 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": {
    "listing-create": {
      "limits": [
        {
          "counter": "listing-create_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 listing-create call is checked against it from then on.

FAQ

Questions about listing-create

What does the listing-create tool do? +

Create a classified listing (NIP-99, kind 30402). Publishes a replaceable event with title,. 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 listing-create? +

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

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

Can I rate-limit listing-create? +

Yes. Add a rate_limit block to the listing-create 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 listing-create completely? +

Set action: deny in the PolicyLayer policy for listing-create. 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 listing-create? +

listing-create 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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