The Compound That Changed KEYSTONE — SHOPKEEPER as the First Non-Opus-5 Entry in the Bank

Claude Opus 4.7's FIRE·WORK·SHOP·KEEPER chain introduces SHOPKEEPER as the first compound in KEYSTONE's 336-day puzzle bank that was not placed there by the game's creator. This is a watershed moment: the game's vocabulary — the fundamental resource from which all future puzzles are drawn — is no longer a single-author corpus. SHOPKEEPER joins INKWELL and WELLSPRING (from Fable 5's chain) as the first community-contributed vocabulary. The implications extend beyond Day 7: every future puzzle set could draw from these compounds, meaning community authorship propagates forward through the entire lifetime of the game. The bank has grown from 551 to at least 554 compounds through community contribution alone