Auto Tool

Auto Tool detects the block you are looking at and swaps in the most effective tool from your hotbar, then returns to your previous slot when you are done. It only acts while you are actually aiming at a block and by default requires the attack button to be held.

Hover delay

How long (in ticks) you must keep looking at a block before the swap happens. Useful for avoiding tool swaps while you are just scanning the terrain.

Delay

Ticks between tool swaps while re-targeting. A small delay makes the swap pattern look more human.

Disallow right clicking

Never swap tools while the right mouse button is held, so tools do not change while you are placing blocks or eating. On by default.

Sneak

Only swap tools while sneaking. Handy on servers where swapping tools while moving gets flagged.

Hold mouse

Require the attack button to be held before swapping. On by default; keep it on so tools never swap while you are just walking.

Swap back

Return to the previously selected slot when you stop mining. On by default.