diff --git a/scripts/wk/hw/smart.py b/scripts/wk/hw/smart.py
index 11163f9b..79e95df7 100644
--- a/scripts/wk/hw/smart.py
+++ b/scripts/wk/hw/smart.py
@@ -237,7 +237,10 @@ def get_smart_self_test_last_result(dev) -> str:
   result = 'Unknown'
 
   # Parse SMART data
-  data = dev.raw_smartctl.get('ata_smart_self_test_log', {}).get('standard', {}).get('table', [])
+  data = dev.raw_smartctl.get(
+    'ata_smart_self_test_log', {}).get(
+    'standard', {}).get(
+    'table', [])
   if not data:
     # No results found
     return result
diff --git a/scripts/wk/std.py b/scripts/wk/std.py
index cea6b2e1..85ae3f93 100644
--- a/scripts/wk/std.py
+++ b/scripts/wk/std.py
@@ -6,6 +6,8 @@ import platform
 import re
 import time
 
+from typing import Union
+
 
 # STATIC VARIABLES
 LOG = logging.getLogger(__name__)
@@ -73,7 +75,7 @@ def bytes_to_string(size, decimals=0, use_binary=True):
   return size_str
 
 
-def sleep(seconds=2):
+def sleep(seconds: Union[int, float] = 2) -> None:
   """Simple wrapper for time.sleep."""
   time.sleep(seconds)
 
diff --git a/scripts/wk/ui/cli.py b/scripts/wk/ui/cli.py
index 3fb7c173..c2f19292 100644
--- a/scripts/wk/ui/cli.py
+++ b/scripts/wk/ui/cli.py
@@ -12,6 +12,7 @@ import traceback
 from collections import OrderedDict
 from prompt_toolkit import prompt
 from prompt_toolkit.validation import Validator, ValidationError
+from typing import Tuple
 
 try:
   from functools import cache
@@ -234,10 +235,10 @@ class Menu():
     # Done
     return valid_answers
 
-  def _resolve_selection(self, selection):
+  def _resolve_selection(self, selection) -> Tuple[str, dict]:
     """Get menu item based on user selection, returns tuple."""
     offset = 1
-    resolved_selection = None
+    resolved_selection = tuple()
     if selection.isnumeric():
       # Enumerate over numbered entries
       entries = [
@@ -367,7 +368,7 @@ class Menu():
     details['Selected'] = details.get('Selected', False)
     self.toggles[name] = details
 
-  def advanced_select(self, prompt_msg='Please make a selection: '):
+  def advanced_select(self, prompt_msg='Please make a selection: ') -> Tuple[str, dict]:
     """Display menu and make multiple selections, returns tuple.
 
     NOTE: Menu is displayed until an action entry is selected.
@@ -414,7 +415,8 @@ class Menu():
     # Done
     return selected_entry
 
-  def simple_select(self, prompt_msg='Please make a selection: ', update=True):
+  def simple_select(
+      self, prompt_msg='Please make a selection: ', update=True) -> Tuple[str, dict]:
     """Display menu and make a single selection, returns tuple."""
     if update:
       self._update()