Addon: Swap Block

Swap Block is a building utility that replaces a broken block with the placeable block currently held in the main hand. The replacement happens immediately in the same position, and orientation is preserved whenever the target block supports it.

Author: butaixianran

The mechanic is most useful in Creative mode when a wall, floor, roof or decorative pattern must be rebuilt without removing an entire section first. Hold the new material, break the old blocks one by one, and the script fills each position as you work.

Because the tool reacts to the block in hand, changing materials is as simple as switching the selected hotbar slot.