fix: Fix ColorParseError by ensuring hex colors have # prefix

aider/io.py

@@ -963,6 +963,7 @@ class InputOutput:
 
         if not isinstance(message, Text):
             message = Text(message)
+        color = ensure_hash_prefix(color) if color else None
         style = dict(style=color) if self.pretty and color else dict()
         try:
             self.console.print(message, **style)
@@ -993,7 +994,7 @@ class InputOutput:
         style = dict()
         if self.pretty:
             if self.tool_output_color:
-                style["color"] = self.tool_output_color
+                style["color"] = ensure_hash_prefix(self.tool_output_color)
             style["reverse"] = bold
 
         style = RichStyle(**style)

tests/basic/test_io.py

@@ -446,6 +446,33 @@ class TestInputOutputMultilineMode(unittest.TestCase):
         self.assertEqual(ensure_hash_prefix("1234567"), "1234567")  # Wrong length
         self.assertEqual(ensure_hash_prefix("xyz"), "xyz")  # Invalid hex chars
         self.assertEqual(ensure_hash_prefix("12345g"), "12345g")  # Invalid hex chars
+        
+    def test_tool_output_color_handling(self):
+        """Test that tool_output correctly handles hex colors without # prefix"""
+        from unittest.mock import patch
+        from rich.text import Text
+        
+        # Create IO with hex color without # for tool_output_color
+        io = InputOutput(tool_output_color="FFA500", pretty=True)
+        
+        # Patch console.print to avoid actual printing
+        with patch.object(io.console, "print") as mock_print:
+            # This would raise ColorParseError without the fix
+            io.tool_output("Test message")
+            
+            # Verify the call was made without error
+            mock_print.assert_called_once()
+            
+            # Verify the style was correctly created with # prefix
+            # The first argument is the message, second would be the style
+            kwargs = mock_print.call_args.kwargs
+            self.assertIn("style", kwargs)
+            
+        # Test with other hex color 
+        io = InputOutput(tool_output_color="00FF00", pretty=True)
+        with patch.object(io.console, "print") as mock_print:
+            io.tool_output("Test message")
+            mock_print.assert_called_once()
 
 
 if __name__ == "__main__":