Sarg338/steam-mcp

A read-only Model Context Protocol server for the
public Steam Web API and storefront — **41 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**
That's the whole setup. **19 of the 41 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:
> 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.
---
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."
---
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 |