Steam MCP Server
MCP server providing 25 tools to query Steam store data, player statistics, achievements, reviews, pricing, workshop items, leaderboards, inventory, and player profiles for AI-powered IDEs like Cursor.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
steam_clearAchievementClear (re-lock) an achievement for a player via the partner API. Intended for dev/test use. Requires a publisher API key with server IP allowlisted in Steamworks partner settings.
steam_createLobbyGet code examples and documentation for creating Steam multiplayer lobbies. Lobby creation is a client-side SDK operation (ISteamMatchmaking) and cannot be done via HTTP API. This tool returns ready-to-use code for C++, C#, and GDScript.
steam_getAchievementStatsGet global achievement unlock percentages for a Steam app. Shows how many players have unlocked each achievement. No API key required.
steam_getAppDetailsGet Steam store data for an app including price, description, reviews, tags, platforms, and system requirements. No API key required.
steam_getAppReviewSummaryGet review summary statistics for a Steam app: total positive/negative counts, review score, and score description. No individual reviews returned. No API key required.
steam_getLeaderboardEntriesGet leaderboard scores and rankings for a Steam app. Pass the numeric leaderboard ID from your Steamworks dashboard, not the name. Uses the partner API (partner.steam-api.com) which requires a publisher API key with server IP allowlisted in Steamworks. Supports global, around-user, and friends-only …
steam_getLeaderboardsForGameList all leaderboards for a Steam app with their numeric IDs, names, and sort methods. Requires a free Steam Web API key (STEAM_API_KEY). No publisher access needed.
steam_getNewsForAppGet recent news articles for a Steam app. Returns titles, URLs, contents, dates, and authors. No API key required.
steam_getOwnedGamesGet a player's game library with playtime data. Shows all owned games, total playtime, and recent playtime. Requires STEAM_API_KEY.
steam_getPlayerAchievementsGet a specific player's achievement unlock status and timestamps for a Steam app. The player's profile must be public. Requires STEAM_API_KEY.
steam_getPlayerCountGet the current number of concurrent players for a Steam app. No API key required.
steam_getPlayerSummaryGet a player's Steam profile including display name, avatar, online status, and profile visibility. Requires STEAM_API_KEY.
steam_getPriceOverviewBatch price check for multiple Steam apps in a specific region. Returns formatted price data including base price, discount, and final price. No API key required.
steam_getRegionalPricingGet pricing for a Steam app across multiple regions/countries. Returns price, currency, and discount info for each region. No API key required.
steam_getReviewsFetch user reviews for a Steam app with filters for language, sentiment, purchase type, and pagination. No API key required.
steam_getSchemaForGameGet the achievement and stat schema for a Steam app. Returns achievement internal names, display names, descriptions, and icon URLs, plus stat definitions. Useful for mapping internal ACH_ names to human-readable names. Requires STEAM_API_KEY.
steam_getWorkshopItemGet details for a Steam Workshop item including title, description, tags, preview images, and subscriber count. No API key required.
steam_grantInventoryItemGrant an inventory item to a player via the partner API. Intended for dev/test or server-side rewards. Requires a publisher API key with server IP allowlisted in Steamworks partner settings.
steam_queryWorkshopSearch and browse Steam Workshop items for a given app. Filter by text, tags, and sort order. Requires STEAM_API_KEY.
steam_resolveVanityURLConvert a Steam vanity URL (custom profile name) to a 64-bit Steam ID. Requires STEAM_API_KEY.
steam_searchAppsSearch the Steam store for games and apps by name or keyword. Returns app IDs, names, icons, and price info. No API key required.
steam_setAchievementSet (unlock) an achievement for a player via the partner API. Intended for dev/test use. Requires a publisher API key with server IP allowlisted in Steamworks partner settings.
steam_updateWorkshopItemUpdate metadata for an existing Steam Workshop item (title, description, visibility, tags) via the partner API. Requires a publisher API key with server IP allowlisted. File content updates require the SDK.
steam_uploadLeaderboardScoreUpload a score to a Steam leaderboard via the partner API. Requires a publisher API key with server IP allowlisted in Steamworks partner settings.
steam_uploadWorkshopItemGet code examples and documentation for uploading new Steam Workshop items. Workshop uploads require the Steamworks SDK (ISteamUGC) running in a client or dedicated tool — there is no HTTP upload endpoint. This tool returns ready-to-use code for C++, C#, and GDScript.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
STEAM_API_KEYexport ="your_key_here"Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
25/25 tools missing one or more hints — steam_clearAchievement (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); steam_createLobby (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); steam_getAchievementStats (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +22 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
Only 0/25 tool handlers declare input schemas (0%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool handlers catch errors
23/25 tool handlers wrap calls in try/catch (92%)
Wrap each tool handler body in try/catch and return a structured error response.
Tool test coverage
Only 0/25 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.12.1 (high), @modelcontextprotocol/sdk@1.12.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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