diff --git a/nextcloud_mcp_server/client/calendar.py b/nextcloud_mcp_server/client/calendar.py
index 2c4f43f..c268a67 100644
--- a/nextcloud_mcp_server/client/calendar.py
+++ b/nextcloud_mcp_server/client/calendar.py
@@ -125,10 +125,14 @@ class CalendarClient(BaseNextcloudClient):
 
         except HTTPStatusError as e:
             if e.response.status_code == 401:
-                logger.warning("Authentication failed for CalDAV - Calendar app may not be enabled for this user")
+                logger.warning(
+                    "Authentication failed for CalDAV - Calendar app may not be enabled for this user"
+                )
                 return []
             elif e.response.status_code == 404:
-                logger.warning("CalDAV endpoint not found - Calendar app may not be installed")
+                logger.warning(
+                    "CalDAV endpoint not found - Calendar app may not be installed"
+                )
                 return []
             logger.error(f"HTTP error listing calendars: {e}")
             raise e
@@ -435,7 +439,6 @@ class CalendarClient(BaseNextcloudClient):
         # Add alarms/reminders
         reminder_minutes = event_data.get("reminder_minutes", 0)
         if reminder_minutes > 0:
-
             alarm = Alarm()
             alarm.add("action", "DISPLAY")
             alarm.add("description", "Event reminder")
diff --git a/nextcloud_mcp_server/server.py b/nextcloud_mcp_server/server.py
index 3f0ac6d..a23a170 100644
--- a/nextcloud_mcp_server/server.py
+++ b/nextcloud_mcp_server/server.py
@@ -372,7 +372,7 @@ async def nc_calendar_create_event(
     color: str = "",
 ):
     """Create a comprehensive calendar event with full feature support
-    
+
     Args:
         calendar_name: Name of the calendar to create the event in
         title: Event title
@@ -394,7 +394,7 @@ async def nc_calendar_create_event(
         attendees: Comma-separated email addresses
         url: Related URL for the event
         color: Event color (hex or name)
-    
+
     Returns:
         Dict with event creation result
     """
@@ -609,16 +609,16 @@ async def nc_calendar_create_meeting(
     reminder_minutes: int = 15,
 ):
     """Quick meeting creation with smart defaults
-    
+
     This is a convenience function for creating events with common meeting defaults.
     It automatically:
     - Calculates end time based on duration
     - Sets status to CONFIRMED
     - Adds a reminder
     - Uses simpler date/time inputs instead of full ISO format
-    
+
     For full control over all event properties, use nc_calendar_create_event instead.
-    
+
     Args:
         title: Meeting title
         date: Meeting date (YYYY-MM-DD format, e.g., "2025-01-15")
@@ -630,7 +630,7 @@ async def nc_calendar_create_meeting(
         location: Meeting location
         description: Meeting description/agenda
         reminder_minutes: Minutes before meeting to send reminder (default: 15)
-    
+
     Returns:
         Dict with meeting creation result
     """
diff --git a/tests/integration/test_calendar_operations.py b/tests/integration/test_calendar_operations.py
index 70fd466..2ac0239 100644
--- a/tests/integration/test_calendar_operations.py
+++ b/tests/integration/test_calendar_operations.py
@@ -95,10 +95,10 @@ async def test_list_calendars(nc_client: NextcloudClient):
     calendars = await nc_client.calendar.list_calendars()
 
     assert isinstance(calendars, list)
-    
+
     if not calendars:
         pytest.skip("No calendars available - Calendar app may not be enabled")
-    
+
     logger.info(f"Found {len(calendars)} calendars")
 
     # Check structure of calendars