Replcraft allows users to automate parts of their base on a Minecraft server using code directly from a repl. To get started, users need a Replit account and a Minecraft account, as well as the Replcraft template. They can then create structures, place blocks, check for entities, move and craft items, read redstone, and more. The library provides event-based and poll-based update streams to watch for block changes immediately. Users can also perform actions such as crafting, watching for redstone updates, and checking for entities. Replcraft has limitations, including the need to manage block supply and being limited to structures. The library can be combined with other tools like Mineflayer or modding APIs to achieve more complex automation and control over the game.