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Penny Engine — Agent Operations

io.github.kasheik3/penny-engine in the official MCP registry. Endpoint https://penny-agent-api-production.up.railway.app/mcp.

The registry describes it as: Remote MCP utilities for agents: structured data, commerce checks, and x402 paid API discovery.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

claude mcp add --transport http penny-engine https://penny-agent-api-production.up.railway.app/mcp

{
  "mcpServers": {
    "penny-engine": {
      "url": "https://penny-agent-api-production.up.railway.app/mcp"
    }
  }
}

code --add-mcp '{"name":"penny-engine","type":"http","url":"https://penny-agent-api-production.up.railway.app/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which. The free lazaretto-guard plugin reads a server's tools the moment Claude Code adds it and asks you if one of our rules matches.

Tools it advertises

penny_margin penny_cleaning_quote penny_marketplace_profit penny_target_price penny_campaign_economics penny_subscription_ltv penny_url_clean penny_slugify penny_json_inspect penny_html_extract penny_csv_to_json penny_catalog_audit penny_trend_radar penny_capability_router penny_fulfillment_preflight penny_choose_service penny_catalog_import_guard penny_product_evidence

Run this server? Show the check in your README

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[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-kasheik3-penny-engine/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-kasheik3-penny-engine)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.

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