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steamwebapi

io.github.sellrock-de/steamwebapi in the official MCP registry. Endpoint https://mcp.steamwebapi.com/mcp.

The registry describes it as: Live Steam Market API docs, schemas, products, games, markets and endpoint search.

We read its 11 tools on 2026-10-30. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.

A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.

Connect it

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

Claude Code

claude mcp add --transport http steamwebapi https://mcp.steamwebapi.com/mcp

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "steamwebapi": {
      "url": "https://mcp.steamwebapi.com/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"steamwebapi","type":"http","url":"https://mcp.steamwebapi.com/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.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

Install lazaretto-guard

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

get_integration_skill search_endpoints get_endpoint list_endpoints list_games list_markets list_products get_concept list_concepts get_pricing call_readonly_endpoint

Run this server? Show the check in your README

The badge reflects the latest weekly read:

Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-sellrock-de-steamwebapi/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-sellrock-de-steamwebapi)

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.