Steam Server

A local MCP server that lets Claude fetch data from your Steam game library via the Steam Web API. All tools are read-only — the server never modifies your account.

Tools

Tool	What it does
steam_get_owned_games	Lists owned games with total playtime, sorted by playtime or name
steam_get_recently_played_games	Games played in the last ~2 weeks
steam_get_player_summary	Profile info: name, status, currently playing, account creation date
steam_get_player_achievements	Achievements for a specific game (requires appid)
steam_resolve_vanity_url	Converts a custom profile URL to a SteamID64

Prerequisites

1. Steam Web API key — get one for free at https://steamcommunity.com/dev/apikey (requires a logged-in Steam account; enter any domain, e.g. localhost).
2. Your SteamID64 — the 17-digit number for your account. Find it via your profile URL, or use steam_resolve_vanity_url if you have a custom URL.
3. Profile must be public — under Steam → Profile → Edit Profile → Privacy, "Game details" must be set to Public, otherwise library and achievement calls will return empty.
4. uv installed — curl -LsSf https://astral.sh/uv/install.sh | sh
5. Python 3.10+ (uv will manage this automatically).

Installation

uv sync

Connecting to Claude

The server uses stdio transport and runs as a local subprocess. It works with MCP clients such as Claude Desktop and Claude Code.

Claude Desktop

Open the config file (Settings → Developer → Edit Config) and add the server. Replace the paths and values with your own:

{
  "mcpServers": {
    "steam": {
      "command": "uv",
      "args": ["run", "--directory", "/full/path/to/steam-api-mcp", "src/steam_mcp.py"],
      "env": {
        "STEAM_API_KEY": "YOUR_API_KEY_HERE",
        "STEAM_ID": "YOUR_STEAMID64_HERE"
      }
    }
  }
}

STEAM_ID is optional. If set, you won't need to provide your own ID in every request — the tools fall back to this value. You can still pass a different steam_id to look at a friend's (public) profile.

Restart Claude Desktop after saving. You can then ask things like:

• "Which 10 games have I played the most on Steam?"
• "What have I played in the last two weeks?"
• "How many achievements do I have in appid 570?"

Claude Code

claude mcp add steam uv run --directory /full/path/to/steam-api-mcp src/steam_mcp.py \
  --env STEAM_API_KEY=YOUR_KEY --env STEAM_ID=YOUR_STEAMID64

Testing Outside a Client

With MCP Inspector you can click through the tools manually:

STEAM_API_KEY=your_key STEAM_ID=your_id \
  npx @modelcontextprotocol/inspector uv run src/steam_mcp.py

Privacy and Limitations

• The API only returns data a profile has made public.
• Your key is stored in the client config / environment variables and is never sent anywhere other than Steam.
• The Steam Web API has reasonable rate limits (approx. 100,000 calls/day). The server returns a clear 429 message if you hit a temporary limit.