marketplace-compare

Compare two or more L402 services side by side — pricing, capabilities, and shared features.

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/marketplace-compare.md

WHAT IT DOES

What marketplace-compare does on Nostr Bray

AI agents call marketplace-compare 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 marketplace-compare is rated Low

This is a pure information retrieval and comparison tool. It queries service metadata (pricing, capabilities, features) and presents results side-by-side. There are no side effects: no data is created, modified, deleted, or committed. No code is executed, no financial transactions are initiated. The action is read-only introspection of service information.

From the tool's definition Tool performs comparison of L402 services by examining 'pricing, capabilities, and shared features' — it retrieves and presents information for analysis without modifying any data or triggering financial transactions.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs marketplace-compare 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-compare, this is the rule to start with:

marketplace-compare Allowed

marketplace-compare 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": {
    "marketplace-compare": {}
  }
}

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 marketplace-compare call is checked against it from then on.

FAQ

Questions about marketplace-compare

What does the marketplace-compare tool do? +

Compare two or more L402 services side by side — pricing, capabilities, and shared features. 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 marketplace-compare? +

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

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

Can I rate-limit marketplace-compare? +

Yes. Add a rate_limit block to the marketplace-compare 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 marketplace-compare completely? +

Set action: deny in the PolicyLayer policy for marketplace-compare. 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 marketplace-compare? +

marketplace-compare 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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