marketplace-inspect
Get full details of a specific L402 service by event ID, or by provider pubkey + identifier.
This record as markdown: /tools/dev-forgesworn-bray/marketplace-inspect.md
What marketplace-inspect does on Nostr Bray
AI agents call marketplace-inspect 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.
Why marketplace-inspect is rated Low
This tool queries and retrieves information about L402 services (payment-enabled services on Nostr) without creating, modifying, deleting, or executing anything. The operation is purely informational—inspecting/fetching details by event ID or provider credentials. No financial transactions occur; it merely reads service metadata.
From the tool's definition Description states 'Get full details of a specific L402 service', using the verb 'Get' which indicates data retrieval with no modifications or side effects.
Attacks that exploit this kind of access
The rule that runs marketplace-inspect 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 marketplace-inspect, this is the rule to start with:
marketplace-inspect is read-only, so it stays allowed. 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 marketplace-inspect call is checked against it from then on.
Questions about marketplace-inspect
Get full details of a specific L402 service by event ID, or by provider pubkey + identifier. It is categorised as a Read tool in the Nostr Bray MCP Server, which means it retrieves data without modifying state.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for marketplace-inspect: 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.
marketplace-inspect is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the marketplace-inspect 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 marketplace-inspect. 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.
marketplace-inspect 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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