diff --git a/aider/commands.py b/aider/commands.py
index e16586203..74a0dd956 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -1172,11 +1172,17 @@ class Commands:
 
         try:
             pyperclip.copy(last_assistant_message)
-            preview = last_assistant_message[:50] + "..." if len(last_assistant_message) > 50 else last_assistant_message
+            preview = (
+                last_assistant_message[:50] + "..."
+                if len(last_assistant_message) > 50
+                else last_assistant_message
+            )
             self.io.tool_output(f"Copied last assistant message to clipboard. Preview: {preview}")
         except pyperclip.PyperclipException as e:
             self.io.tool_error(f"Failed to copy to clipboard: {str(e)}")
-            self.io.tool_output("You may need to install xclip or xsel on Linux, or pbcopy on macOS.")
+            self.io.tool_output(
+                "You may need to install xclip or xsel on Linux, or pbcopy on macOS."
+            )
         except Exception as e:
             self.io.tool_error(f"An unexpected error occurred while copying to clipboard: {str(e)}")