Update app.py

app.py

@@ -70,7 +70,15 @@ subjects_df = fetch_table("subjects")
 # --- Define SQL tool for the agent ---
 @tool
 def sql_engine(query: str) -> list:
-    """Executes SQL queries on students and subjects and returns list of tuples."""
+    """
+    Executes SQL queries on the available tables: students and subjects.
+
+    Args:
+        query (str): The SQL query string to execute.
+
+    Returns:
+        list: List of tuples containing the query results.
+    """
     try:
         print(f"🧩 Executing query: {query}")
         with engine.connect() as con: