listing-close
Mark a classified listing as sold or closed (NIP-99, kind 30402).
This record as markdown: /tools/dev-forgesworn-bray/listing-close.md
What listing-close does on Nostr Bray
AI agents use listing-close 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.
Why listing-close is rated Medium
The tool updates metadata on an existing listing (marking it closed/sold) without permanently deleting data or executing arbitrary code. This is a Write operation because it modifies data reversibly. Severity is medium because misuse could affect marketplace listings, potentially disrupting commerce or user experience, but the change is not irreversible and does not involve financial transactions directly.
From the tool's definition Tool performs 'Mark a classified listing as sold or closed', which modifies the state of an existing listing resource via NIP-99 kind 30402 (Nostr classified listings standard). This is a reversible state change operation.
Attacks that exploit this kind of access
The rule that runs listing-close 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-close, this is the rule to start with:
listing-close 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every listing-close call is checked against it from then on.
Questions about listing-close
Mark a classified listing as sold or closed (NIP-99, kind 30402). 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.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for listing-close: 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.
listing-close is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the listing-close 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.
Set action: deny in the PolicyLayer policy for listing-close. 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.
listing-close 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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