Update app.py

app.py

@@ -57,6 +57,15 @@ for row in subject_rows:
 # --- Define SQL tool for the agent ---
 @tool
 def sql_engine(query: str) -> list:
+    """
+    Executes SQL queries on the available tables: students and subjects.
+
+    Args:
+        query: SQL query string.
+
+    Returns:
+        List of tuples with query results.
+    """
     try:
         print(f"🧩 Executing query: {query}")  # Debug log
         with engine.connect() as con: