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Search and retrieve Steam Web API and Steamworks SDK documentation. Returns endpoint signatures, parameter descriptions, and code examples. Use when the user needs to call a Steam API, wants to know available endpoints, or is integrating Steamworks SDK methods.
Design and document Steam achievements. Helps structure achievement definitions (API name, display name, description, icon requirements, hidden flag) and generates the VDF/JSON config snippets for Steamworks upload. Use when planning or implementing achievements.
Integrate anti-cheat solutions with Steam games. Covers EasyAntiCheat (EAC), BattlEye, and VAC setup, Proton/Linux compatibility, Steam Deck considerations, and custom anti-cheat patterns. Use when adding anti-cheat protection to a multiplayer Steam game.
Generate structured bug report templates for Steam games. Covers report structure, Steam system info integration, crash dump guidance, known issues tracking, and forum integration. Use when setting up bug reporting workflows or helping players submit useful reports.
Automate Steam builds with SteamPipe CI/CD integration. Covers GitHub Actions, GitLab CI, and Jenkins pipelines for depot uploads, beta branch management, and Docker-containerized builds. Use when setting up automated Steam build pipelines or configuring CI/CD for Steamworks distribution.
Implement Steam Cloud save functionality. Covers ISteamRemoteStorage for manual cloud saves, Auto-Cloud configuration, conflict resolution, and quota management. Use when adding cloud save support to a game or debugging cloud sync issues.
Post-launch community management for Steam games. Covers announcements, events, discussion forum moderation, update post templates, and Community Hub configuration. Use when managing player communication, creating events, or setting up community channels.
| name | steam-api-reference |
| description | Search and retrieve Steam Web API and Steamworks SDK documentation. Returns endpoint signatures, parameter descriptions, and code examples. Use when the user needs to call a Steam API, wants to know available endpoints, or is integrating Steamworks SDK methods. |
| standards-version | 1.10.0 |
| drift-ignore | stale-counts |
Use this skill when the user:
Identify the relevant API interface. Steam Web APIs are organized into interfaces:
| Interface | Purpose |
|---|---|
ISteamApps | App metadata, version checks |
ISteamUser | Player identity, friends, bans |
ISteamUserStats | Achievements, stats, leaderboards |
IPlayerService | Owned games, playtime, badges |
ISteamNews | Game news feeds |
ISteamRemoteStorage | Workshop / UGC file details |
IPublishedFileService | Workshop queries (newer API) |
ISteamEconomy | In-game economy, trade |
ISteamMicroTxn | Microtransaction support |
ISteamWebAPIUtil | API key validation, server info |
Fetch documentation. Use the WebFetch tool to retrieve the relevant doc page:
https://partner.steamgames.com/doc/webapi/{InterfaceName}
For SDK methods:
https://partner.steamgames.com/doc/api/{InterfaceName}
If the interface is unknown, search for the method:
"Steam Web API {user's query} site:partner.steamgames.com"https://api.steampowered.com/ISteamWebAPIUtil/GetSupportedAPIList/v1/?key={apikey}
Present the endpoint information:
https://api.steampowered.com/{Interface}/{Method}/{Version}/Provide a code example in the language most relevant to the user's project. Default to curl if unclear:
curl.exe "https://api.steampowered.com/ISteamUserStats/GetPlayerAchievements/v1/?appid=440&key=YOUR_KEY&steamid=76561198000000000"
Users should store their API key in an environment variable (STEAM_API_KEY) and never commit it.
| Method | URL | Key? |
|---|---|---|
| Get app list | ISteamApps/GetAppList/v2/ | No |
| App details (store) | store.steampowered.com/api/appdetails?appids=X | No |
| Current players | ISteamUserStats/GetNumberOfCurrentPlayers/v1/?appid=X | No |
| Player achievements | ISteamUserStats/GetPlayerAchievements/v1/?appid=X&key=K&steamid=S | Yes |
| Global achievement % | ISteamUserStats/GetGlobalAchievementPercentagesForApp/v2/?gameid=X | No |
| User stats | ISteamUserStats/GetUserStatsForGame/v2/?appid=X&key=K&steamid=S | Yes |
| Owned games | IPlayerService/GetOwnedGames/v1/?key=K&steamid=S | Yes |
| News for app | ISteamNews/GetNewsForApp/v2/?appid=X | No |
User: "How do I get a list of achievements for my game from the Steam API?"
Agent:
ISteamUserStats/GetPlayerAchievements and GetGlobalAchievementPercentagesForAppcurl example and explains the response structureThe Steam MCP server provides 25 tools that call Steam APIs directly, eliminating the need for manual curl commands for common operations.
No API key required (10 tools):
| Tool | Description |
|---|---|
steam_getAppDetails({ appid, cc?, l? }) | Store data: price, reviews, tags, platforms, system requirements |
steam_searchApps({ query, cc?, l? }) | Search the Steam store by name |
steam_getPlayerCount({ appid }) | Current concurrent player count |
steam_getAchievementStats({ appid }) | Global achievement unlock percentages |
steam_getWorkshopItem({ publishedfileid }) | Workshop item details (title, tags, subscribers) |
steam_getReviews({ appid, filter?, language?, review_type?, purchase_type? }) | User reviews with filters and pagination |
steam_getPriceOverview({ appids, cc }) | Batch price check for multiple apps in a region |
steam_getAppReviewSummary({ appid }) | Review score, totals, and positive percentage |
steam_getRegionalPricing({ appid, countries }) | Pricing breakdown across multiple countries |
steam_getNewsForApp({ appid, count?, maxlength? }) | Recent news and announcements |
Requires STEAM_API_KEY environment variable (8 tools):
| Tool | Description |
|---|---|
steam_getPlayerSummary({ steamid }) | Player profile: name, avatar, online status |
steam_getOwnedGames({ steamid, include_played_free_games?, include_appinfo? }) | Game library with playtime data |
steam_queryWorkshop({ appid, search_text?, cursor?, numperpage?, query_type?, requiredtags? }) | Search and browse Workshop items |
steam_getLeaderboardEntries({ appid, leaderboardid, rangestart?, rangeend?, datarequest?, steamid? }) | Leaderboard scores and rankings |
steam_resolveVanityURL({ vanityurl, url_type? }) | Convert vanity URL to 64-bit Steam ID |
steam_getSchemaForGame({ appid }) | Achievement/stat schema with display names, descriptions, icons |
steam_getPlayerAchievements({ steamid, appid }) | Per-player achievement unlock status and timestamps |
steam_getLeaderboardsForGame({ appid }) | List all leaderboards with numeric IDs |
SDK guidance / publisher key (7 tools):
| Tool | Auth | Description |
|---|---|---|
steam_createLobby({ type, max_members, metadata }) | SDK guide | ISteamMatchmaking lobby creation code examples |
steam_uploadWorkshopItem({ appid, title, ... }) | SDK guide | ISteamUGC Workshop upload code examples |
steam_updateWorkshopItem({ publishedfileid, ... }) | Publisher key | Update Workshop item metadata via partner API |
steam_setAchievement({ steamid, appid, achievement }) | Publisher key | Unlock an achievement (dev/test) |
steam_clearAchievement({ steamid, appid, achievement }) | Publisher key | Re-lock an achievement (dev/test) |
steam_uploadLeaderboardScore({ appid, leaderboardid, ... }) | Publisher key | Upload leaderboard scores |
steam_grantInventoryItem({ appid, steamid, itemdefid }) | Publisher key | Grant inventory items |
When an MCP tool exists for a given endpoint, prefer it over raw curl calls. For endpoints not covered by MCP tools (user stats, microtransactions), continue using the Web API directly.
The Steamworks SDK documentation and example generation logic remain the same regardless of MCP availability.
api.steampowered.com vs partner.steam-api.com. Partner endpoints require IP allowlisting and won't work from the public base.format parameter — some older endpoints default to VDF output instead of JSON. Always pass format=json for programmatic consumption.