Steam Games MCP vs Cosmergon Agent

get_prices

Get current price and discount for a batch of games by appid in one call — efficient for checking a whole list (e.g. a wishlist) for deals. Handles up to 250 appids; if you also need review %, hardware compatibility or tags, use get_items instead (max 50 appids). Rows come back in the same order as the given appids, one per id (unavailable ones marked available:false, never dropped). Each row has the final/initial price and discount_percent (or is_free). No API key required. Get appids from search_games or get_wishlist.

get_specials

List games currently on special (discounted) on the Steam store front page, with the discount % and original/final price. For ALL catalog discounts (not just the front page), use discover_games with min_discount. No API key required.

get_featured

Get the Steam store's featured sections: specials, top sellers, new releases and coming soon (each a list of games with appid and price), all in one call — for a general 'what's on the store front page' overview. For just current discounts use get_specials (lighter), or discover_games for catalog-wide deals with filters. No API key required.

get_game_news

Get recent news / patch notes for a game by appid (title, date, author, excerpt, link). An unknown/unassigned appid comes back as an empty list rather than an error, the same as get_global_achievements. Get the appid from search_games. No API key required.

get_global_achievements

Get the global unlock percentage of each achievement in a game by appid — how rare each achievement is across all players. Returns each achievement's internal name and its unlock percent (no display names/descriptions — for those, use get_game_achievements), most-common first, capped at the first 200 (check `returned` vs `count` — most games have far fewer). An unknown appid, or one with no achievement schema (e.g. a DLC/soundtrack), comes back as an empty list rather than an error, the same as get_game_news. Get the appid from search_games. No API key required.

get_items

Get price/discount, review % (positive), hardware compatibility, popular user tags and release date for a LIST of games by appid in ONE keyless call. The efficient way to price-, rating-, tag- and compat-check a wishlist or library without a request per game. For a bigger batch (up to 250 appids) when you only need price, use get_prices instead. An unknown/invalid appid comes back as its own row marked available:false (never dropped from the list), same as get_prices. Each item carries four compatibility fields, each verified/playable/unsupported/unknown: steam_deck (Steam Deck), steam_os (SteamOS in general), steam_machine (the Steam Machine console specifically), and steam_frame (Steam Frame VR headset); a `vr_support` flag (none/supported/required — distinct from steam_frame, which is a Steam Frame HARDWARE compat rating, not whether the game itself has a VR mode); a `tags` list (top user tags like 'Roguelike', 'Souls-like', most-relevant first); a clickable `store_url` to the game's Steam page; and, when on sale, `discount_end` (ISO UTC time the discount expires — for 'how long is this deal valid'). To find NEW games by filter (discount, rating, tags, compat) instead of pricing a list you already have, use discover_games instead. Get appids from search_games / get_wishlist / get_owned_games.

discover_games

Find games across the whole Steam catalog (keyless), filtered by ANY combination of: discount (min_discount — for 'what's on sale'), release recency (released_after / released_within_days — for 'new games'), hardware compatibility (steam_deck/steam_os/steam_machine/steam_frame — see each field's own description), native OS build (platform — windows/mac/linux), review quality (min_review / min_reviews), and user tags (tags — e.g. ['Roguelike', 'Deckbuilding'] for 'games like X'). Each result returns price/discount, review %, all four compat statuses, a vr_support flag (none/supported/required), popular tags, a clickable store_url, discount_end (when a deal expires) and release date in one call. Examples: '>80% off with 90%+ reviews' → set min_discount + min_review; 'recent well-reviewed games that run on Steam Deck' → set released_within_days + steam_deck + min_review; 'roguelike deckbuilders on sale' → tags:['Roguelike','Deckbuilding'] + min_discount. No appids needed — unlike get_items, which prices a list you already have. For 'games like X' from a SINGLE named title, get its tags via get_items and pass them here; for taste inferred from the player's WHOLE library instead, use get_recommended_games (key-gated). Note: min_discount is filtered server-side and re-checked client-side (so it holds at any value); setting released_after/released_within_days excludes not-yet-released games server-side, but the exact date cutoff — plus compat, platform, review and tag filtering — has no server-side support in the Steam catalog API, so those are scanned popularity-first and applied afterward over that same window — great for popular titles; a niche match may fall outside the top `count` (raise count for stricter filters). At most 60 results come back per call, best discount first: compare `returned` against `matched` to see whether the list was capped, and narrow the filters or page with `start` for the rest.

get_current_players

Get how many people are playing a game right now (live concurrent player count) by appid. Get the appid from search_games. No API key required. Errors clearly if the appid is unknown/invalid rather than returning a null count.