Client Build Tools (CBT)
Client-side building assistance tools for minecraft fabric
Disclaimer
CBT is considered cheating on many servers due to the nature of the mod. You may experience punishment for using this mod on servers!
Functionality
CBT features multiple modes which can be switched by holding the G key (configurable) and scrolling the mouse.
Currently, there are 3 core modes featured in CBT:
- Line: Builds a horizontal line of blocks
- Wall: Builds a vertical line of blocks
- Patcher: Patches holes around the player
Each mode can also have a settings (e.g. Length, Height, Range) which can be changed by holding shift and the Cycle Build Mode key and scrolling the mouse.
FAQ
Some blocks are placed wrong?
The mod is not perfect and sometimes blocks will be misplaced. I've taken measures to prevent this but since CBT is client-side only this behaviour is not 100% fixable.
Showcase
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as Client-Build-Tools-0.2.0+mc1.21.1.jar — drop this file into the mods folder
- Download size: 72 KB
- Download link checked 5 Sept 2026 — working
These come from our own check of the pack file, not from the source page.