Building Assistant is a client-and-server NeoForge mod for Minecraft 1.21.1 that provides an in-game workspace for planning structures before changing the world.
Use the Builder Tool to open a prompt and create a world-anchored ghost preview. The preview can be moved horizontally, raised or lowered, rotated, closed and reopened, or cancelled without placing or removing blocks.
This release is intentionally non-mutating. The Finish action remains locked, so Building Assistant cannot place structures or alter the world.
Remote planning, automated construction, rollback, and provider integrations are not included in this version.
