diff --git a/game_server/__init__.py b/game_server/__init__.py
index 7d99013..bef76e9 100644
--- a/game_server/__init__.py
+++ b/game_server/__init__.py
@@ -1,5 +1,7 @@
 from game_server.net.gateway import Gateway
+from game_server.game.chat.command_handler import handler
 
 class GameServer:
     def main(self, ServerIp, GameServerPort):
+        handler.load_commands()
         Gateway(ServerIp, GameServerPort)
diff --git a/game_server/game/chat/__init__.py b/game_server/game/chat/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/game_server/game/chat/command/__init__.py b/game_server/game/chat/command/__init__.py
new file mode 100644
index 0000000..f509ebf
--- /dev/null
+++ b/game_server/game/chat/command/__init__.py
@@ -0,0 +1,16 @@
+import importlib
+import os
+import sys
+
+
+folder = "game_server/game/chat/command"
+sys.path.append(os.path.dirname(folder))
+
+for filename in os.listdir(folder):
+    if filename.endswith(".py") and filename != "__init__.py":
+        module_name = filename[:-3]
+        module_path = f"game_server.game.chat.command.{module_name}"
+        try:
+            importlib.import_module(module_path)
+        except Exception as e:
+            print(f"Error importing module '{module_path}': {e}")
diff --git a/game_server/game/chat/command/max_skill.py b/game_server/game/chat/command/max_skill.py
new file mode 100644
index 0000000..25bb723
--- /dev/null
+++ b/game_server/game/chat/command/max_skill.py
@@ -0,0 +1,48 @@
+from database import mongo
+from lib.proto import GetAvatarDataReq, AvatarSubSkill
+from game_server.net.session import Session
+from game_server.resource import ResourceManager
+from game_server.game.enum.data_type import DataType
+from game_server.game.chat.decorators import Command
+from game_server.resource.configdb.avatar_sub_skill_data import AvatarSubSkillData
+
+@Command(
+    prefix="maxskill",
+    usage="/maxskill {avatar_id | all} - Maximize the skills of a specific avatar. Use 'all' to maximize the skills of all avatars.",
+)
+async def execute(session: Session, avatar_id):
+    desc = getattr(execute, "usage", "No description available.")
+
+    if avatar_id == "all":
+        for avatar in session.player.avatars.values():
+            await max_out_skills_for_avatar(avatar, session)
+        return "All avatars' skills have been maxed out!"
+
+    if not avatar_id.isdigit():
+        return f"Usage: {desc}"
+
+    avatar_id = int(avatar_id)
+
+    avatar = session.player.avatars.get(avatar_id)
+    if not avatar:
+        return f"Avatar with ID {avatar_id} does not exist."
+
+    await max_out_skills_for_avatar(avatar, session)
+
+    return f"All skills for avatar {avatar_id} have been maxed out!"
+
+async def max_out_skills_for_avatar(avatar, session:Session):
+    resource_manager = ResourceManager.instance()
+    for skill_id, skill in avatar.skill_lists.items():
+        sub_skills = [
+            data for data in resource_manager.values(AvatarSubSkillData) 
+            if data.skillId == skill_id
+        ]
+        for sub_skill_data in sub_skills:
+            skill.sub_skill_lists[sub_skill_data.avatarSubSkillId] = AvatarSubSkill(
+                sub_skill_id=sub_skill_data.avatarSubSkillId,
+                level=sub_skill_data.maxLv
+            )
+
+    mongo.save(session, DataType.AVATAR, [avatar.avatar_id])
+    await session.process_packet(session.create_packet(GetAvatarDataReq(avatar_id_list=[avatar.avatar_id])))
diff --git a/game_server/game/chat/command/rank.py b/game_server/game/chat/command/rank.py
new file mode 100644
index 0000000..2c099a2
--- /dev/null
+++ b/game_server/game/chat/command/rank.py
@@ -0,0 +1,46 @@
+from game_server.game.enum.data_type import DataType
+from game_server.game.chat.decorators import Command
+from game_server.net.session import Session
+from database import mongo
+from lib.proto import GetAvatarDataReq
+
+@Command(
+    prefix="rank",
+    usage="/rank {avatar_id | all} {rank} - Edit the rank of a specific avatar or use 'all' to update the rank of all avatars.",
+)
+async def execute(session: Session, avatar_id, rank="1"):
+    desc = getattr(execute, "usage", "No description available.")
+
+    if not rank.isdigit():
+        return f"Usage: {desc}"
+    
+    if avatar_id == "all":
+        for avatar in session.player.avatars.values():
+            await update_avatar_rank(avatar, rank, session)
+        return f"Updated rank for all avatars to {rank}."
+
+    if not avatar_id.isdigit():
+        return f"Usage: {desc}"
+
+    avatar_id = int(avatar_id)
+
+    avatar = session.player.avatars.get(avatar_id)
+    if not avatar:
+        return f"Avatar with ID {avatar_id} does not exist."
+
+    await update_avatar_rank(avatar, rank, session)
+
+    return f"Updated avatar {avatar_id}'s rank to {rank}."
+
+async def update_avatar_rank(avatar, rank, session:Session):
+    rank = int(rank)
+    if rank < 1:
+        rank = 1
+    if rank > 5:
+        rank = 5
+
+    avatar.star = rank
+
+    mongo.save(session, DataType.AVATAR, [avatar.avatar_id])
+
+    await session.process_packet(session.create_packet(GetAvatarDataReq(avatar_id_list=[avatar.avatar_id])))
diff --git a/game_server/game/chat/command_handler.py b/game_server/game/chat/command_handler.py
new file mode 100644
index 0000000..803ec72
--- /dev/null
+++ b/game_server/game/chat/command_handler.py
@@ -0,0 +1,53 @@
+from utils.logger import Info
+from game_server.game.chat.decorators import command_registry
+from game_server.net.session import Session
+import game_server.game.chat.command  # noqa: F401
+
+
+class CommandHandler:
+    def load_commands(self):
+        registered_commands = ", ".join(
+            item.prefix for item in command_registry.values() if not item.is_alias
+        )
+
+        Info(
+            f"[BOOT] [CommandHandler] Registered {len(command_registry)} game commands => {registered_commands}"
+        )
+
+    def parse_command(self, content: str):
+        content = content.lstrip("/")
+        parts = content.split(maxsplit=1)
+        if len(parts) < 2:
+            return parts[0], ""
+
+        return parts[0], parts[1]
+
+    def print_help(self):
+        result = "Available commands:\n"
+        for index, (_, func) in enumerate(command_registry.items()):
+            result += f"{index+1}) {func.usage}\n\n"
+        return result
+
+    async def handle_command(self, session: Session, content: str):
+        if content == "/help":
+            return self.print_help()
+
+        command_label, args = self.parse_command(content)
+        command_func = command_registry.get(command_label)
+
+        if command_func is not None:
+            func_args_cnt = command_func.__code__.co_argcount - 1
+            args_list = args.split()[:func_args_cnt]
+
+            if args_list and args_list[0] == "help":
+                return f"Usage: {command_func.usage}"
+
+            try:
+                return await command_func(session, *args_list)
+            except TypeError:
+                return f"Usage: {command_func.usage}"
+
+        return None
+
+
+handler = CommandHandler()
diff --git a/game_server/game/chat/decorators.py b/game_server/game/chat/decorators.py
new file mode 100644
index 0000000..52a19c2
--- /dev/null
+++ b/game_server/game/chat/decorators.py
@@ -0,0 +1,21 @@
+from typing import Dict, Type
+
+
+command_registry: Dict[str, Type] = {}
+
+
+def Command(prefix: str, usage: str, aliases: list = list()):
+    def decorator(func):
+        func.usage = usage
+        func.prefix = prefix
+        func.is_alias = False
+        command_registry[prefix] = func
+
+        # Register alias if exist
+        for alias in aliases:
+            func.is_alias = True
+            command_registry[alias] = func
+
+        return func
+
+    return decorator
diff --git a/game_server/packet/handlers/SendChatMsgNotify.py b/game_server/packet/handlers/SendChatMsgNotify.py
new file mode 100644
index 0000000..21264af
--- /dev/null
+++ b/game_server/packet/handlers/SendChatMsgNotify.py
@@ -0,0 +1,68 @@
+import betterproto
+from utils.time import get_unix_in_seconds
+from game_server.net.session import Session
+from game_server.game.chat.command_handler import handler
+from lib.proto import (
+    SendChatMsgNotify,
+    RecvChatMsgNotify,
+    ChatMsg,
+    ChatMsgSensitiveCheckResult,
+    ChatMsgMsgChannel,
+    ChatMsgContent,
+    ChatMsgItem
+)
+
+
+async def handle(session: Session, msg: SendChatMsgNotify) -> betterproto.Message:
+    string_msg=[msg.msg_str for msg in msg.chat_msg.content.items if msg.msg_str != None][0]
+    msgs=[
+        ChatMsg(
+            uid=session.player.uid,
+            nickname=session.player.name,
+            time=get_unix_in_seconds(),
+            msg=string_msg,
+            channel=ChatMsgMsgChannel.WORLD.value,
+            avatar_id=session.player.assistant_avatar_id,
+            dress_id=session.player.avatars.get(session.player.assistant_avatar_id).dress_id,
+            frame_id=session.player.head_frame,
+            custom_head_id=session.player.head_photo,
+            check_result=ChatMsgSensitiveCheckResult(
+                rewrite_text=string_msg
+            ),
+            content=ChatMsgContent(
+                items=[
+                    ChatMsgItem(
+                        msg_str=string_msg
+                    )
+                ]
+            )
+        )
+    ]
+    text = await handler.handle_command(session, string_msg)
+    if text:
+        msgs.append(
+            ChatMsg(
+                uid=0,
+                nickname="Ai-Chan",
+                time=get_unix_in_seconds(),
+                msg=text,
+                channel=ChatMsgMsgChannel.WORLD.value,
+                avatar_id=3201,
+                dress_id=593201,
+                frame_id=200001,
+                custom_head_id=161080,
+                check_result=ChatMsgSensitiveCheckResult(
+                    rewrite_text=text
+                ),
+                content=ChatMsgContent(
+                    items=[
+                        ChatMsgItem(
+                            msg_str=text
+                        )
+                    ]
+                )
+            )
+        )
+    return RecvChatMsgNotify(
+        chat_msg_list=msgs
+    )