The **Chat Members** plugin adds first‑class support for Telegram `ChatMember` objects to grammY bots. It lets developers filter and react to member‑status changes (e.g., joins, leaves, promotions) with expressive custom filters, and automatically stores and updates those members in a configurable storage backend, providing fast look‑ups via `ctx.chatMembers.getChatMember`. It’s aimed at bot authors who need reliable, performant handling of user and bot membership events in groups and super‑groups.