fix(agent): Autofix trailing commas in LLM-generated JSON

Author: selamw1

samples/agent/adk/restaurant_finder/agent.py

@@ -15,6 +15,7 @@
 import json
 import logging
 import os
+import re
 from collections.abc import AsyncIterable
 from typing import Any
 
@@ -226,6 +227,9 @@ async def stream(self, query, session_id) -> AsyncIterable[dict[str, Any]]:
                     if not json_string_cleaned:
                         raise ValueError("Cleaned JSON string is empty.")
 
+                    # Autofix: Remove trailing commas from arrays and objects
+                    json_string_cleaned = re.sub(r",\s*([\]}])", r"\1", json_string_cleaned)
+
                     # --- New Validation Steps ---
                     # 1. Check if it's parsable JSON
                     parsed_json_data = json.loads(json_string_cleaned)