pysteam-client

Modern Python client for the Steam network — CM protocol, PICS, CDN, WebAuth, Web API, Steam Guard, SteamIDs — plus a fully-async facade for FastAPI / TaskIQ and an MCP tool set for LLM agents.

Maintained fork of ValvePython/steam for Python 3.13+ and current Steam wire protocols. Full docs in the Wiki.

Install

pip install pysteam-client[client]

[client] pulls in the gevent-based SteamClient (login, PICS, CDN). Without it the requests-only subset (WebAPI / WebAuth / SteamID / master-server query) still works.

Quick start

Sync (script, CLI, batch jobs):

from steam.client import SteamClient

client = SteamClient()
client.anonymous_login()
info = client.get_product_info(apps=[440], timeout=15)
print(info["apps"][440]["common"]["name"])
client.logout()

Async (FastAPI, TaskIQ, any asyncio app):

from steam.aio import AsyncSteamClient

async with AsyncSteamClient() as client:
    await client.anonymous_login()
    info = await client.get_product_info(apps=[440])

MCP (expose to an LLM agent):

from mcp.server.fastmcp import FastMCP
from steam.aio import AsyncSteamClient
from steam.mcp import register_steam_tools

server = FastMCP("Steam")
client = AsyncSteamClient()
await client.start()
await client.anonymous_login()
register_steam_tools(server, client)   # steam.status, steam.get_product_info, steam.send_um

Documentation

Full documentation lives in the Wiki. Highlights:

Getting started

Client APIs

SteamClient — sync gevent client (the original)
PICS — app / package metadata
CDNClient — depot downloads
WebAuth — authenticated session
WebAPI — api.steampowered.com wrapper
SteamAuthenticator — 2FA
SteamID — parse / convert Steam IDs
Master Server Queries

Async / FastAPI / MCP (new in 1.6)

AsyncSteamClient — asyncio facade
Pool — multi-account
FastAPI Integration
TaskIQ Integration
MCP — Model Context Protocol tools + FastMCP adapter

Advanced

Security

Every push, PR, and release runs the following gates before any wheel ships to PyPI: ruff + black (style), mypy --strict (types), pytest (unit + integration), deptry (deps hygiene), bandit (Python SAST), pip-audit (CVEs), CodeQL (cross-file SAST), OpenSSF Scorecard (repo posture). A failing gate blocks the publish step.

Report a vulnerability: use GitHub Security Advisories (private, coordinated disclosure). Full policy in SECURITY.md. Do NOT open a public GitHub issue for security reports.

License

MIT — see LICENSE. Unchanged from upstream.

Development Status
- 5 - Production/Stable
Intended Audience
- Developers
License
- OSI Approved :: MIT License
Natural Language
- English
Operating System
- OS Independent
Programming Language
- Python :: 3
- Python :: 3.13

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