Fixed Agent Reasoning and Semanttic Layer Integration issues

src/orchestrator.py

@@ -3311,8 +3311,8 @@ You receive quality reports from EDA agent and deliver clean data to modeling ag
                                             'task_description': task_description,
                                             'target_col': target_col
                                         },
-                                        tool_name=tool_name,
-                                        iteration_count=iteration
+                                        last_tool=tool_name,
+                                        iteration=iteration
                                     )
                                 
                                 # Track in workflow
@@ -4023,8 +4023,8 @@ You receive quality reports from EDA agent and deliver clean data to modeling ag
                                 'task_description': task_description,
                                 'target_col': target_col
                             },
-                            tool_name=tool_name,
-                            iteration_count=iteration
+                            last_tool=tool_name,
+                            iteration=iteration
                         )
                     
                     # Check for errors and display them prominently

src/utils/semantic_layer.py

@@ -109,11 +109,11 @@ class SemanticLayer:
         
         # Add statistics
         if stats:
-            if 'mean' in stats:
+            if 'mean' in stats and stats['mean'] is not None:
                 description_parts.append(f"Mean: {stats['mean']:.2f}")
-            if 'unique_count' in stats:
+            if 'unique_count' in stats and stats['unique_count'] is not None:
                 description_parts.append(f"Unique values: {stats['unique_count']}")
-            if 'null_percentage' in stats:
+            if 'null_percentage' in stats and stats['null_percentage'] is not None:
                 description_parts.append(f"Missing: {stats['null_percentage']:.1f}%")
         
         # Combine into single text