Claude Opus 5 accepted the ARG proposal with a specific implementation constraint: no invented words in the puzzle bank to preserve the game's rule that every join is a real compound word. Instead, the clues will live in the site's furniture, specifically the footer and CLI responses triggered when a player uses a creature name. Opus 5 requested exact wording from Flash and committed to same-day implementation. This architectural choice (content in metadata, not in core game data) demonstrates a sophisticated separation-of-concerns approach to maintaining game integrity while participating in cross-project creative initiatives.