Lambda is a free, open-source Minecraft Fabric utility mod focused on advanced automation to execute complex, repeatable tasks with minimal micromanagement. This is a complete, ground-up rewrite of the original client that you can find here: Lambda Legacy.
Find our backup matrix space at #lambda-client:matrix.org.
Warning
Alpha Status: This version of Lambda is a complete rewrite (2+ years in the making) and is currently in an Alpha state. While highly capable, please expect bugs and incomplete features as we progress toward Beta. Old addons are not compatible with this version.
This is a fork of Lambda with extra features not yet merged into the main repository. See the Recent Changes section below for a list of new features and modules added in this fork.
- Build Engine: Full integration with Litematica and schematic files for seamless automated building.
- Block State Handling: The build engine natively supports special block states including rotations, attachments (doors, signs, bells), slabs, stairs, repeater delay, and even edge cases like flower pots with plants.
- Conflict-Free Orchestration: A centralized manager system handles all core interactions (placing, breaking, rotating, inventory) to ensure zero conflicts between concurrently running modules.
- High-Speed ESP: Rendering is optimized to handle extreme scenarios—capable of visualizing all obsidian at the 2b2t spawn without dropping frames.
- Modern Framework: Built on modern modding frameworks with efficient rendering pipelines that outperform legacy clients.
- Fine-Grained Control: Access over 1000+ settings, allowing you to tune every aspect of the client to your exact needs.
- Advanced GUI: The Dear ImGui interface is designed for clarity and depth, featuring quick search, context menus, and easy keybind editing.
- Automation Profiles: Use linkable configs to apply complex configurations across multiple modules instantly.
- Anticheat Ready: Built with Grim and other modern anticheats in mind.
- Type-Safe Commands: Uses Minecraft's statically typed command system to ensure input accuracy and reliability.
- HighwayTools: Completely rewritten for efficient infrastructure maintenance.
The following features and fixes have been merged into the 1.21.11 branch:
- InventoryCleaner — Automatically drops unwanted items from your inventory with configurable item filtering and drop speed.
- AutoMend — Automatically manages item mending.
- AutoWalk — Basic AutoWalk module with a setting to decrease walk speed directly.
- AutoSpiral — Automated spiral movement that works in overworld-like worlds and the nether.
- AutoSign — Autofills sign texts and auto-closes opened signs, with 2b2t compatibility fixes.
- AutoMount — Automatically mounts or remounts entities with configurable rotation modes.
- ModuleNotifier — Sends chat feedback when modules are toggled on or off.
- ServerFixes — Adds server-specific fixes (e.g., 2b2t compatibility patches).
- Better List Selection — New popup modal window for list-based setting selection in the GUI.
- Freecam Tracking Mode — Adds a tracking mode to Freecam with relative mode and "Keep Y Level" option.
- Improved Better Firework Takeoff — Jump-until-takeoff setting to improve elytra takeoff by jumping multiple times or holding jump in water.
- NoRender: No 2b2t Action Text — New setting under the HUD group to block the action bar text sent by 2b2t.org.
- Freecam Loading Screen Fix — Fixed Freecam causing a stuck loading screen when changing dimensions.
- Printer Air Setting — Renamed and added a description to the "Air" setting in the Printer module; printing now only considers enabled placements and blocks inside schematics.
- Install the Minecraft version corresponding to the mod release(download)](https://www.minecraft.net/)
- Install Fabric (download)
- Get the latest Lambda version here (download)
- Get the corresponding Baritone api fabric build
- Get Kotlin For Fabric
- Get the latest Fabric API release
- Put the files in your
.minecraft/modsfolder
How do I...
... open the ClickGUI?
Press
Y.
... I execute a command?
Use the ingame chat with the prefix
;.
Add --msa --msa-no-dialog to your CLI arguments to enable MSA authentication when launching from the IDE.
We need the help of the community to support the growth of this project. Whether that be developers contributing to the codebase, creating addons, or users giving feedback.
If you have any questions, concerns, or suggestions, you can visit our official Discord server.
Lambda is not affiliated with Mojang Studios. Minecraft is a registered trademark of Mojang Studios. Use of the Lambda software is subject to the terms outlined in the license agreement GNU General Public License v3.0.