Steam MCP (read-only)

Steam MCP

A read-only Model Context Protocol server for the public Steam Web API and storefront — 37 tools, 5 prompts, and 2 resources that let any MCP client (Claude Desktop, Claude Code, Cursor, …) answer questions about Steam: your friends, games, playtime, and achievements, plus account-independent things like sales, reviews, live player counts, Steam Deck compatibility, discovery, recommendations, and co-op planning.

Read-only · official Steam APIs only · open source. Nobody logs in, and the server never writes, trades, posts, launches games, or makes purchases.

Quick start — no API key needed

Install uv, then:

Claude Code

claude mcp add steam -- uvx steam-mcp

That's the whole setup. 15 of the 37 tools work with no credential at all — anything about the store or a game itself:

"Is Baldur's Gate 3 worth buying, and how are its recent reviews trending?" "What co-op games are on sale under £20 right now?" "How many people are playing Helldivers 2 this minute?" "Will Hades II run properly on my Steam Deck?"

The three game-finders (steam_discover, steam_should_i_buy, steam_recommend) work without a key too, as long as you don't personalize them.

Adding your own account

A free Steam Web API key (a minute to get) unlocks the other 22 — the ones that read a specific account: library, playtime, friends, achievements, wishlist, inventory. Add STEAM_USER too and "my"/"I" default to you, so you never have to paste a SteamID:

claude mcp add steam --env STEAM_API_KEY=YOUR_KEY --env STEAM_USER=your_steam_name -- uvx steam-mcp

Tip: this defaults to the current project. Add --scope user only if you want Steam in every project — that keeps its tools in context everywhere, so prefer per-project scope unless Steam is cross-cutting for you.

Claude Desktop — download steam-mcp.mcpb from the latest release and open it (Settings → Extensions). Both fields are optional; leave them blank for the keyless tools and fill them in later.

Cursor / Cline / Windsurf and the manual pip setup are under Setup below.

Without a key, the account tools are still listed but marked [unavailable: needs STEAM_API_KEY], so your assistant knows to reach for a keyless tool instead of failing at one it can't use.

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What it can answer

Account / profile (needs a public profile; set STEAM_USER and "my"/"I" default to you — no SteamID needed):

• "Who's on my friends list, and who's online right now?"
• "Which of my friends own Helldivers 2 — and who's playing it now?"
• "It's game night — what co-op games do my online friends and I all own?"
• "Analyze my library — my backlog, and what I loved but abandoned."
• "Which achievements am I missing in Hollow Knight, and which are my rarest?"
• "What's on my wishlist, and is any of it on sale?"
• "Based on what I play most, what should I check out next?"
• "What's in my CS2 inventory, and which items are marketable?"

Account-independent (works for any game, no SteamID needed):

• "Is Baldur's Gate 3 worth buying — and how are its recent reviews trending?"
• "What's on sale right now, and what are the current top sellers?"
• "How many people are playing Counter-Strike 2 this minute?"
• "Will Hades II run on my Steam Deck?"
• "What's the Community Market price of a Field-Tested AK-47 | Redline?"
• "Is Elden Ring a soulslike? What are its community tags?"
• "Find well-reviewed co-op roguelikes under $20."
• "Recommend games like Hollow Knight that I don't already own."

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Tools

Tool	What it returns	Needs key?
steam_resolve_vanity_url	Vanity name / profile URL → SteamID64	yes
steam_get_player_summary	Status (Online/Away/In-Game…), current game, for 1–100 users	yes
steam_get_friend_list	Friends enriched with name + live status	yes
steam_find_friends_who_own	Which friends own (or are playing) a game — "who can I play X with"	yes
steam_get_user_groups	The Steam groups/clans a user is in (name, URL, member count)	yes
steam_plan_coop_night	Co-op games the host + friends all own (ranked by owners) — or mode="new" for fresh co-op games none of them own yet; with who's online now	yes
steam_get_owned_games	Owned games with total/recent hours (sortable)	yes
steam_analyze_library	Backlog, playtime distribution, abandoned games across a whole library	yes
steam_get_recently_played_games	Last-2-weeks playtime	yes
steam_get_steam_level	Steam community level	yes
steam_get_player_bans	VAC / game / community / economy bans	yes
steam_get_player_achievements	Per-game unlocked vs locked achievements	yes
steam_get_game_schema	A game's full achievement/stat definitions	yes
steam_get_global_achievement_percentages	Achievement rarity (global %)	no
steam_get_user_game_stats	A user's in-game stats (kills, wins, distance…) for a game	yes
steam_get_rarest_unlocks	A player's rarest achievement unlocks in a game (by global rarity)	yes
steam_search_apps	Game title → appid (+ price)	no
steam_discover	Find/recommend games by tag, price, sale, platform, release window ("last N days") — optionally personalized to a user's taste (excludes games they own)	no*
steam_should_i_buy	Buying brief — price, lifetime + recent reviews (trend), tags, Metacritic, and your taste match	no*
steam_recommend	Recommend games like a seed game or your taste, with the shared tags as the "why"	no*
steam_get_app_details	Full store details — play modes/co-op, controller, DLC, languages, requirements, Metacritic, Steam Deck	no
steam_get_deck_compatibility	Steam Deck rating (Verified/Playable/Unsupported) + the per-criterion test results	no
steam_get_dlc	A game's DLC, with live prices and what's on sale	no
steam_get_app_regional_pricing	A game's price across regions (each in local currency)	no
steam_get_workshop_item	Workshop item metadata (game, tags, subscribers, favorites, views)	no
steam_get_app_tags	A game's top community tags (Souls-like, Roguelike, Cozy…)	no
steam_get_app_reviews	Lifetime verdict, +/- counts, sample reviews; optional recent (last-N-days) score via review_filter='recent'	no
steam_get_featured_specials	Games currently on sale (regional)	no
steam_get_store_highlights	Top sellers, new releases, or coming soon	no
steam_get_wishlist	A user's wishlist, with live prices + what's on sale	yes
steam_get_inventory	A user's inventory — game items or Steam Community items (cards, emoticons…), with tradable/marketable flags	yes†
steam_get_market_price	Community Market price for an item (lowest/median/24h volume) + type/rarity + CS2 condition	no
steam_get_player_badges	Badges + the XP breakdown behind a Steam level	yes
steam_get_package_details	Package/bundle price + included games	no
steam_compare_players	Shared games between two users, with playtime	yes
steam_get_current_players	Live concurrent player count	no
steam_get_app_news	Recent news / patch notes	no

Every tool supports response_format: "markdown" (default) or "json", and all are annotated readOnlyHint: true. Prefer the composite tools (steam_should_i_buy, steam_recommend, steam_discover, steam_plan_coop_night) over chaining several calls, and ask for json only when you need to parse fields. Tools that read localized text accept a language parameter — a Steam language name like french or schinese (default english).

* steam_discover, steam_should_i_buy, and steam_recommend need no key for the store data; their personalization (passing a steamid to use a user's library/taste) requires a key and a public profile.

† steam_get_inventory reads a keyless endpoint, but it still has to know whose inventory — and turning a vanity name (or STEAM_USER) into a SteamID64 is itself a keyed call. Pass a raw 17-digit SteamID64 and it works with no key.

Prompts & resources

Beyond tools, the server ships prompts (guided one-click flows that orchestrate the tools) and resources (reference Steam entities by URI):

• Prompts: what_should_i_play, is_it_worth_buying, plan_game_night, steam_deals, game_overview.
• Resources: steam://app/{appid} (store details) and steam://user/{steamid} (profile + live status).

Recent reviews: Steam's API only exposes a lifetime review summary — there is no "last 30 days" field. So steam_get_app_reviews with review_filter='recent' computes that score itself by paginating the newest reviews within day_range days (default 30). For games with a very high volume of recent reviews it counts up to ~600 and marks the result sampled: true.

Market prices: steam_get_market_price uses Steam's Community Market endpoints, which are undocumented and tightly rate-limited. Results are cached briefly; an item with no current listings reports its price as unavailable.

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Setup

1. Get a free Steam Web API key (optional)

Skip this if you only want the 15 keyless tools — the server runs fine without a key and the account tools simply advertise themselves as unavailable.

To unlock the account tools, visit https://steamcommunity.com/dev/apikey, sign in, register a domain (any domain you control works; localhost is commonly used for personal keys), and copy the key. Usage is governed by the Steam Web API Terms of Use.

2. Install

The published package needs no checkout (Python 3.10+):

uvx steam-mcp          # zero-install via uv (recommended)
# or
pip install steam-mcp  # run as: python -m steam_mcp.server

Both MCP Python SDK majors work (mcp>=1.28). On the v2 SDK the server speaks spec revision 2026-07-28 — stateless, no initialize handshake — advertises cache hints on its tool/prompt/resource listings, and can ask you which Steam account is yours when STEAM_USER isn't set (once per session, and only if your client supports elicitation). On the v1.x line it serves the initialize handshake that modern clients fall back to anyway. Nothing to configure either way.

TLS note: the HTTP client is httpx2, which verifies certificates against your operating system's trust store rather than a bundled CA list. If you run this somewhere minimal (a slim container with no system CA store, or behind a private CA), point SSL_CERT_FILE or SSL_CERT_DIR at a CA bundle.

3. Add it to your MCP client

Both settings are optional. STEAM_API_KEY unlocks the account tools; STEAM_USER (your Steam vanity name, SteamID64, or profile URL) makes those tools default to you whenever you don't name a user, so you never paste a SteamID. It's a public profile name, not a secret, and you can still pass a steamid to any call to override it.

Configure neither and you get the keyless server; configure both and you get everything.

Claude Code

claude mcp add steam --env STEAM_API_KEY=YOUR_KEY --env STEAM_USER=your_steam_name -- uvx steam-mcp

STEAM_USER is optional — drop the second --env if you'd rather give a SteamID to each call.

Claude Desktop — install steam-mcp.mcpb from the latest release via Settings → Extensions and paste your key (and, optionally, your Steam name).

Everything else (Claude Desktop config, Cursor, Cline, Windsurf, VS Code, …) — drop this block into the client's MCP config file:

{
  "mcpServers": {
    "steam": {
      "command": "uvx",
      "args": ["steam-mcp"],
      "env": {
        "STEAM_API_KEY": "YOUR_KEY_HERE",
        "STEAM_USER": "your_steam_name"
      }
    }
  }
}

Config locations: Claude Desktop claude_desktop_config.json (%APPDATA%\Claude\ on Windows, ~/Library/Application Support/Claude/ on macOS); Cursor .cursor/mcp.json; Cline cline_mcp_settings.json. Restart the client and the Steam tools appear. Running from a source checkout instead? Use "command": "python", "args": ["-m", "steam_mcp.server"].

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Security

Read-only, official-Steam-only, and bring-your-own-key. In short:

• Read-only — never writes, trades, posts, launches games, or buys anything.
• Your key stays yours — read from STEAM_API_KEY; never written to disk, logged, cached, or put in output (and redacted from error messages).
• Official hosts only — the request layer refuses any host that isn't api.steampowered.com / store.steampowered.com / steamcommunity.com (SSRF guard), with per-host rate limiting and retry/backoff.
• Typed, validated inputs (extra="forbid"); no data kept between requests beyond a small TTL cache of non-user store data.

Full details and how to report issues are in SECURITY.md.

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Versioning & stability

steam-mcp follows Semantic Versioning. As of 1.0, the following are the stable public surface — they won't change without a major (2.0) release:

• Tool names and their input parameters (names, types, whether required, defaults)
• JSON output fields (response_format: "json") — names, types, and structure
• Prompt names/arguments and resource URI templates (steam://app/{appid}, steam://user/{steamid})
• Core semantics: read-only, bring-your-own-key, prices in cents / playtime in minutes, and errors returned as strings

Within a major version, minor releases may add tools, prompts, resources, optional parameters, and JSON fields; patch releases are bug fixes only. The Markdown output wording, internal implementation, caching behavior, and which Steam endpoints back a given tool may change at any time and are not part of the contract.

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License

MIT. Not affiliated with Valve. "Steam" is a trademark of Valve Corporation.