diff --git a/argenta/app/__init__.py b/argenta/app/__init__.py
index 145d061..80bb821 100644
--- a/argenta/app/__init__.py
+++ b/argenta/app/__init__.py
@@ -1 +1,3 @@
+__all__ = ["App"]
+
 from .entity import App
diff --git a/argenta/app/entity.py b/argenta/app/entity.py
index 0107120..1222d3b 100644
--- a/argenta/app/entity.py
+++ b/argenta/app/entity.py
@@ -51,7 +51,7 @@ class App:
         self._registered_routers: RegisteredRouters = RegisteredRouters()
         self._invalid_input_flags_handler: Callable[[str], None] = lambda raw_command: print_func(f'Incorrect flag syntax: "{raw_command}"')
         self._repeated_input_flags_handler: Callable[[str], None] = lambda raw_command: print_func(f'Repeated input flags: "{raw_command}"')
-        self._empty_input_command_handler: Callable[[], None] = lambda: print_func(f'Empty input command')
+        self._empty_input_command_handler: Callable[[], None] = lambda: print_func('Empty input command')
         self._unknown_command_handler: Callable[[Command], None] = lambda command: print_func(f"Unknown command: {command.get_trigger()}")
         self._exit_command_handler: Callable[[], None] = lambda: print_func(self.farewell_message)
 
diff --git a/argenta/command/__init__.py b/argenta/command/__init__.py
index 5b4073f..82d390d 100644
--- a/argenta/command/__init__.py
+++ b/argenta/command/__init__.py
@@ -1 +1,3 @@
+__all__ = ["Command"]
+
 from .entity import Command
\ No newline at end of file
diff --git a/argenta/command/flag/__init__.py b/argenta/command/flag/__init__.py
index d437340..ea25fbd 100644
--- a/argenta/command/flag/__init__.py
+++ b/argenta/command/flag/__init__.py
@@ -1,2 +1,5 @@
+__all__ = ["Flag", "FlagsGroup"]
+
+
 from .entity import Flag
 from .flags_group.entity import FlagsGroup
\ No newline at end of file
diff --git a/argenta/command/flag/flags_group/__init__.py b/argenta/command/flag/flags_group/__init__.py
index 175b019..81092c9 100644
--- a/argenta/command/flag/flags_group/__init__.py
+++ b/argenta/command/flag/flags_group/__init__.py
@@ -1 +1,4 @@
+__all__ = ["FlagsGroup"]
+
+
 from .entity import FlagsGroup
\ No newline at end of file
diff --git a/argenta/router/__init__.py b/argenta/router/__init__.py
index 04c1a36..d716f22 100644
--- a/argenta/router/__init__.py
+++ b/argenta/router/__init__.py
@@ -1 +1,4 @@
+__all__ = ["Router"]
+
+
 from .entity import Router
\ No newline at end of file