diff --git a/ios-simulator-skill/scripts/navigator.py b/ios-simulator-skill/scripts/navigator.py
index 70644c8..d644907 100755
--- a/ios-simulator-skill/scripts/navigator.py
+++ b/ios-simulator-skill/scripts/navigator.py
@@ -136,6 +136,11 @@ def _flatten_tree(self, node: dict, elements: list[Element] | None = None) -> li
 
         return elements
 
+    def list_elements(self, force_refresh: bool = False) -> list[Element]:
+        """Get flat list of all UI elements on current screen."""
+        tree = self.get_accessibility_tree(force_refresh)
+        return self._flatten_tree(tree)
+
     def find_element(
         self,
         text: str | None = None,
@@ -345,8 +350,7 @@ def main():
 
     # List mode
     if args.list:
-        tree = navigator.get_accessibility_tree()
-        elements = navigator._flatten_tree(tree)
+        elements = navigator.list_elements()
 
         # Filter to tappable elements
         tappable = [
diff --git a/ios-simulator-skill/scripts/simctl_boot.py b/ios-simulator-skill/scripts/simctl_boot.py
index 00f00a4..96d4e09 100755
--- a/ios-simulator-skill/scripts/simctl_boot.py
+++ b/ios-simulator-skill/scripts/simctl_boot.py
@@ -17,7 +17,6 @@
 import subprocess
 import sys
 import time
-from typing import Optional
 
 from common.device_utils import (
     get_booted_device_udid,
diff --git a/ios-simulator-skill/scripts/xcode/config.py b/ios-simulator-skill/scripts/xcode/config.py
index 52abe1b..f2e6595 100644
--- a/ios-simulator-skill/scripts/xcode/config.py
+++ b/ios-simulator-skill/scripts/xcode/config.py
@@ -6,7 +6,7 @@
 
 import json
 import sys
-from datetime import datetime
+from datetime import UTC, datetime
 from pathlib import Path
 from typing import Any
 
@@ -142,7 +142,7 @@ def update_last_used_simulator(self, name: str) -> None:
             name: Simulator name (e.g., "iPhone 16 Pro")
         """
         self.data["device"]["last_used_simulator"] = name
-        self.data["device"]["last_used_at"] = datetime.utcnow().isoformat() + "Z"
+        self.data["device"]["last_used_at"] = datetime.now(UTC).isoformat()
 
     def get_preferred_simulator(self) -> str | None:
         """