pymcbotlite 0.2.0

A lightweight async Python Minecraft bot library for background bots, AFK sessions, and chat relays.

PyMCBotLite

PyMCBotLite is a lightweight async Python library for Minecraft background bots, chat relays, AFK bots, and simple server-control automation.

It is designed for small bots that need to log in, stay connected, receive chat, send chat/commands, relay messages, and integrate with web or Discord applications. Java Edition support is native Python. Bedrock Edition status pings are native Python; full Bedrock bot sessions are provided through an optional PrismarineJS bedrock-protocol bridge so RakNet, Xbox auth, encryption, compression, and packet schemas stay current.

It is not a Mineflayer replacement for pathfinding, full physics, full inventory management, or anti-cheat bypassing.

Quickstart

Install the library:

pip install pymcbotlite

Ping a Java server:

pymcbot ping mc.example.com

Add a Microsoft/Minecraft account for Java online-mode servers:

pymcbot auth add main
pymcbot auth list

Run a foreground Java chat bot:

pymcbot run --host mc.example.com --account main

Minimal Java bot:

from pymcbotlite import Bot

bot = Bot(host="mc.example.com", account="main")

@bot.event
async def on_ready():
    print(f"Logged in as {bot.username}")
    await bot.chat("Hello from PyMCBotLite!")

@bot.event
async def on_chat(message):
    print("[CHAT]", message.clean)

bot.run()

Ping a Bedrock server without Node.js:

pymcbot bedrock-ping bedrock.example.com

Full Bedrock login/chat sessions need the optional Node bridge:

npm install bedrock-protocol

Then use BedrockBot:

from pymcbotlite import BedrockBot

bot = BedrockBot(host="bedrock.example.com", username="XboxGamertag")

@bot.event
async def on_auth_code(code):
    print(code.message or f"Open {code.verification_uri} and enter {code.user_code}")

@bot.event
async def on_ready():
    print(f"Logged in as {bot.username}")
    await bot.chat("Hello from PyMCBotLite Bedrock!")

bot.run()

Run the Java fight bot example:

python examples/fight_bot.py mc.example.com main TargetPlayer

Run the Bedrock/PE fight bot example:

python examples/pe/bedrock_fight_bot.py bedrock.example.com XboxGamertag TargetPlayer

Features

• Async-first Bot API
• Microsoft paid-account authentication
• Multiple named accounts with local token storage
• Minecraft Java 1.21.5 protocol target
• Native Minecraft Bedrock status ping
• Experimental Minecraft Bedrock 1.26.30 / protocol 1001 bridge
• SRV record discovery for domains like play.example.com
• Online-mode login, encryption, compression, keepalive, and resource-pack responses
• Chat receive/send support for compatible servers
• Basic aiming, direct movement, attack, swing, and block-mining controls
• Bounded A* waypoint pathfinding helpers for Java and Bedrock bots
• Java pathfinding can use cached chunk/block data for player clearance, step-up/drop handling, diagonal corner checks, and water/lava avoidance
• Script task controller with clear_scripts() helpers
• Health, death, disconnect, kick, reconnect, packet, and chat events
• Basic auto-reconnect and auto-respawn helpers
• CLI tool: pymcbot
• Discord, websocket, FastAPI, and multi-account examples
• Pluggable token storage for future database-backed account managers

Installation

pip install pymcbotlite

Optional extras:

pip install "pymcbotlite[websocket]"
pip install "pymcbotlite[discord]"

Native Bedrock status ping does not require Node.js:

pymcbot bedrock-ping bedrock.example.com

Full Bedrock bot sessions require Node.js and the PrismarineJS Bedrock protocol package in the application environment:

npm install

or, outside this checkout:

npm install bedrock-protocol

From a source checkout:

python -m pip install -e ".[dev]"

Authentication

Add a Microsoft/Minecraft account:

pymcbot auth add main
pymcbot auth list

If the console script is not on PATH:

python -m pymcbotlite auth add main

Tokens are stored locally:

~/.pymcbotlite/accounts/main.json

Treat account files as secrets. They contain refresh tokens.

Simple Bot

from pymcbotlite import Bot

bot = Bot(host="mc.example.com", account="main", version="1.21.5")

@bot.event
async def on_ready():
    print(f"Logged in as {bot.username}")
    await bot.chat("Hello from PyMCBotLite!")

@bot.event
async def on_chat(message):
    print("[CHAT]", message.clean)

bot.run()

Bedrock Bot

No-Node status ping:

from pymcbotlite import ping_bedrock

status = await ping_bedrock("bedrock.example.com")
print(status.motd, status.players_online, status.players_max)

Full session bridge:

from pymcbotlite import BedrockBot

bot = BedrockBot(
    host="bedrock.example.com",
    port=19132,
    username="XboxGamertag",
)

@bot.event
async def on_auth_code(code):
    print(code.message or f"Open {code.verification_uri} and enter {code.user_code}")

@bot.event
async def on_ready():
    print(f"Logged in as {bot.username}")
    await bot.chat("Hello from PyMCBotLite Bedrock!")

bot.run()

Explicit async control:

await bot.login()
await bot.connect("mc.example.com")
await bot.chat("hello")
await bot.disconnect("bye")

Movement, Combat, And Mining

Java Bot and Bedrock BedrockBot expose the same basic control methods:

await bot.look(90, 0)
await bot.look_at(10.5, 65.5, -2.5)
await bot.move_to(10, 64, -2, stop_distance=1.5)
await bot.move_path_to(10, 64, -2, stop_distance=1.5)  # bounded A*, water-aware on cached Java chunks
await bot.swing_arm()
await bot.attack(target_entity_or_runtime_id)
await bot.mine_block(10, 64, -2)

Try the offline water-avoidance pathfinding demo:

python examples/water_avoidance_pathfinding.py

For a simple chase loop, pass a target id, a target dict from player_visible, or a callable that returns the current target:

bot.start_fighting(lambda: current_target, reach=3.2, attack_interval=0.7)
bot.stop_fighting()

Java examples are in examples/; Bedrock/PE examples are in examples/pe/.

Scripts

Use script tasks for cancellable background actions:

task = bot.create_script_task("patrol", patrol_loop(bot))
bot.clear_scripts()

CLI

pymcbot ping mc.example.com
pymcbot run --host mc.example.com --account main
pymcbot chat --host mc.example.com --account main

PATH-free form:

python -m pymcbotlite ping mc.example.com
python -m pymcbotlite run --host mc.example.com --account main

Events

Decorator style:

@bot.event
async def on_chat(message):
    ...

Listener style:

bot.on("chat", callback)

Events:

ready
disconnect
error
chat
system_message
kick
login
reconnect
resource_pack
death
health
packet
entity_visible
player_visible

Web Integration

from fastapi import FastAPI
from pymcbotlite import Bot

app = FastAPI()
bot = Bot(host="mc.example.com", account="main")

@app.on_event("startup")
async def startup():
    await bot.login()
    await bot.connect()

@app.on_event("shutdown")
async def shutdown():
    await bot.disconnect()

@app.post("/chat")
async def send_chat(data: dict):
    await bot.chat(data["message"])
    return {"ok": True}

Discord Relay

@mc_bot.event
async def on_chat(message):
    channel = discord_bot.get_channel(CHANNEL_ID)
    await channel.send(f"[MC] {message.clean}")

@discord_bot.event
async def on_message(message):
    if message.channel.id == CHANNEL_ID and not message.author.bot:
        await mc_bot.chat(f"[Discord] {message.author.name}: {message.content}")

Multi-Account

from pymcbotlite import BotManager

manager = BotManager()
manager.add_bot("main", host="mc.example.com", account="main")
manager.add_bot("alt1", host="mc.example.com", account="alt1")

await manager.start_all()
await manager.broadcast_chat("All bots online.")
await manager.disconnect_all()

Documentation

The docs/ directory includes:

• Authentication guide
• CLI reference
• API guide
• Relay examples
• Limitations
• Publishing checklist

Bedrock/PE examples live in examples/pe/ with their own setup guide.

Limitations

• Native Java target protocol is Minecraft Java 1.21.5.
• Bedrock status ping is native Python.
• Full Bedrock bot sessions are experimental and require Node.js plus bedrock-protocol.
• Basic chat send may fail on servers requiring full signed-chat/session-key behavior.
• Movement is direct packet movement with bounded A* waypoint planning; Java pathfinding uses cached chunks when available but there is still no full physics simulation.
• Combat/mining controls are basic packet helpers and are not anti-cheat bypasses.
• Inventory support is intentionally minimal.
• No full physics or anti-cheat bypassing.

Development

python -m pip install -e ".[dev,websocket,discord]"
python -B -m unittest discover -s tests
python -m build
python -m twine check dist/*

License

MIT