A Minecraft 26.3 bot written in Python that uses an offline-mode account to play. The connection path targets protocol 777; older Minecraft protocol versions are not supported.

The original bot included wood/sand/crop farming, villager trading, eating, sleeping, and threat avoidance. On the current 26.3 runtime, path following and crop harvest/replant are migrated; other legacy jobs remain unavailable until ported to protocol 777.

Requirements and setup

Python 3.11+
The locally updated pyCraft checkout at ../pyCraft

From the repository root, create and activate a virtual environment, then install the connection-mode dependencies:

$ python3 -m venv .venv
$ source .venv/bin/activate
$ python -m pip install astar flask flask-cors munch watchdog -e ../pyCraft

Running

Run the bot directly with Python. For the Protospace offline-mode server:

$ SERVER=127.0.0.1 python mosfet.py

mosfet.py defaults to that server, player name mosfet1, and the current AuthMe password. Override SERVER, PORT, PLAYER_NAME, or GAME_PASSWORD through environment variables as needed. Microsoft authentication is not used. Python edits under mosfet/ are hot-reloaded in place; the player connection is kept alive. Edits to connection/bootstrap files are reported as deferred until the next manual start, rather than triggering an automatic reconnect.

The 26.3 client now handles AuthMe, chat commands, chunk/world-state caching, modern block/item/entity data, entity tracking, read-only inventory/component sync, path-following movement (1goto x y z), and the crop harvest/replant loop (1farm crops). General inventory/window actions and the other farming/trading jobs remain disabled until their 26.3 packets are migrated. The default server is 127.0.0.1; set SERVER explicitly only when you intentionally want another server.

Usage

How to Cache Items

How to Grab Supplies

Commands

The command prefix character is the last character of the bot's name. For example, if the bot's name is mattstack, then you would issue commands like kfarm wood or kpos. This lets you run multiple bots on the same server.

In the following examples, we'll assume the bot's name is mosfet1, so commands would be ran like 1farm wood or 1pos.

The exception are the below public commands, they can optionally be prefixed with ! and all bots will run the command.

The current 26.3 command path handles public chat. Private-message routing is not migrated yet. Verified commands are !ping, !pos, !loaded, !info x y z, !inv (basic slot/count data), and addressed path movement such as 1goto x y z, and 1farm crops. The command catalog below is retained from the legacy bot; other inventory actions, arbitrary block interaction, and the other farming/trading commands are not yet available on 26.3. Common item components (names, damage, enchantments, book contents, and shulker contents) are decoded; unrecognized component types are marked partial rather than silently discarded.

Public Commands

These can be ran by anyone, all bots will reply.

!help - prints this whole help message to console

!help [command] - replies in-game explaining command

!ping - replies with "pong"

!echo [data] - replies with "data"

!pos - replies with position and dimension

!afk - goes AFK with /afk

!unafk - goes not AFK with /afk

!error - raises an error

!inv - replies and prints current inventory

!time - replies with Minecraft world time

!count [id] - counts the number of items with that id

!loaded - replies with the current loaded area

!players - prints the current players

!players clear - clears the current player list

!objects - prints the current items on ground

!objects clear - clears the current object list

!mobs - prints the current mobs

!mobs clear - clears the current mob list

!monsters - prints the current monsters

!villagers - prints the current villagers

!threats - prints the dangerous monsters within 20 blocks

!threats [num] - prints the dangerous monsters within num blocks

"zzz" or !zzz - bot does /afk to let others sleep

!tree - replies with the closest tree

!block x y z - replies what block is at (x, y, z)

Bot-specific Commands

These will only run for the bot they are addressed to. Replace 1 with the last character of the bot's name.

1respawn - respawns the bot if it's dead

1gather wood - gathers wood from the world

1gather sand - gathers sand from the world

1farm wood - farms wood from a certain area

1farm sand - farms sand from a certain area

1farm wart - farms netherwart from a certain area

1farm crop - farms mature crops from a certain area

1loiter - stands still but eats, sleeps, and flees

1trade - sells items to villagers to get emeralds

1stop - stops the current job and resets bot

1drop - drops the current stack its holding

1select [id] - moves item with id into main hand

1dump [id] - drops all items matching id

1drain - drops all items in inventory

1fill [x] [y] [z] [x] [y] [z] - fills the cuboid with the block at the first coordinate

1here - bot comes to your location

1goto [x] [y] [z] - sends the bot to coordinate (x, y, z)

1close - closes the current Minecraft window

1click [slot] [button] [mode] - clicks the current window

1use - use the item it's currently holding

1interact [entity id] - interacts with that entity

Authorized Commands

These dangerous commands can only be ran by the bot owner.

1print [expression] - replies with Python eval(expression)

1exit - exits the program

License

This program is free and open-source software licensed under the MIT License. Please see the LICENSE file for details.

That means you have the right to study, change, and distribute the software and source code to anyone and for any purpose. You deserve these rights. Please take advantage of them because I like pull requests and would love to see this code put to use.

Acknowledgements

Thanks to Isaia, sose, and the devs behind pyCraft.