Copybara import of the project:

nauyiahc · copybara-github · commit c4cd1802bf86 · 2025-05-28T13:38:11.000-07:00
-- 50b09bb by Yuan Chai <350365422@qq.com>: fix: improve json serialization by allowing non-ascii characters -- c66977a by Yuan Chai <350365422@qq.com>: fix: serialize function call arguments to JSON string Previously accepted JSON objects directly, which was less robust. Now serialize arguments to JSON strings using `_safe_json_serialize`, ensuring stability and handling non-ASCII characters correctly. COPYBARA_INTEGRATE_REVIEW=google#605 from nauyiahc:fix_non_ascii_char a52513c PiperOrigin-RevId: 764396496
diff --git a/src/google/adk/models/lite_llm.py b/src/google/adk/models/lite_llm.py
@@ -136,7 +136,7 @@ def _safe_json_serialize(obj) -> str:
 
   try:
     # Try direct JSON serialization first
-    return json.dumps(obj)
+    return json.dumps(obj, ensure_ascii=False)
   except (TypeError, OverflowError):
     return str(obj)
 
@@ -186,7 +186,7 @@ def _content_to_message_param(
                 id=part.function_call.id,
                 function=Function(
                     name=part.function_call.name,
-                    arguments=json.dumps(part.function_call.args),
+                    arguments=_safe_json_serialize(part.function_call.args),
                 ),
             )
         )
