diff --git a/skills/excalidraw-diagram-generator/scripts/add-arrow.py b/skills/excalidraw-diagram-generator/scripts/add-arrow.py
index 169f09ff1..610b6cd32 100644
--- a/skills/excalidraw-diagram-generator/scripts/add-arrow.py
+++ b/skills/excalidraw-diagram-generator/scripts/add-arrow.py
@@ -233,6 +233,9 @@ def add_arrow_to_diagram(
 
 def main():
     """Main entry point."""
+    if hasattr(sys.stdout, "reconfigure"):
+        # Ensure consistent UTF-8 output on Windows consoles.
+        sys.stdout.reconfigure(encoding="utf-8")
     if len(sys.argv) < 6:
         print("Usage: python add-arrow.py <diagram_path> <from_x> <from_y> <to_x> <to_y> [OPTIONS]")
         print("\nOptions:")
diff --git a/skills/excalidraw-diagram-generator/scripts/add-icon-to-diagram.py b/skills/excalidraw-diagram-generator/scripts/add-icon-to-diagram.py
index f10352545..bfb09c351 100644
--- a/skills/excalidraw-diagram-generator/scripts/add-icon-to-diagram.py
+++ b/skills/excalidraw-diagram-generator/scripts/add-icon-to-diagram.py
@@ -329,6 +329,9 @@ def add_icon_to_diagram(
 
 def main():
     """Main entry point."""
+    if hasattr(sys.stdout, "reconfigure"):
+        # Ensure consistent UTF-8 output on Windows consoles.
+        sys.stdout.reconfigure(encoding="utf-8")
     if len(sys.argv) < 5:
         print("Usage: python add-icon-to-diagram.py <diagram_path> <icon_name> <x> <y> [OPTIONS]")
         print("\nOptions:")