From Brotato Wiki
Item
Improved Tools is an in-game item that can be bought from a Shop or can be found in a Crate. Most Items modify the Stats of the player, and some of them provide additional effects.
Unique
Improved Tools is a unique item. Only 1 of each unique item can be equipped, and it will then no longer be offered in the Shop, and no longer drop from loot crates.
Improved Tools
Improved Tools increases the speed of all Engineering structures by half of the current Attack Speed.
It also adds 10% Attack Speed to the character's stat.
This also applies to Landmines, which will spawn faster, and Gardens which will generate healing fruits faster.
All Engineering structures are affected, no matter the source of the structure.
The in-game tooltip for this item incorrectly states that the "attack cooldown" is reduced by the given amount; this is not the case. The item reduces the effect rate of the structures in the same way as Attack Speed does increase the attack rate of weapons.
Strategy
Improved Tools is powerful for all characters and builds with high Attack Speed, as it applies 50% of that stat's effect to all Engineering structures.
It also makes the Attack Speed stat more useful for pure Engineering builds, which would otherwise not invest heavily in that stat.
It is also very strong on builds that heavily rely on Gardens, such as Pruner builds.
When planning an Engineering build, it can be a good strategy to anticipate picking up this item (especially when the character is tagged with Engineering, so this item will drop more likely). In this case, you can build Attack Speed early in order to help this item's effect later on.