diff --git a/tests/test_cloud.py b/tests/test_cloud.py
index 47fbdaff..52f13ea6 100644
--- a/tests/test_cloud.py
+++ b/tests/test_cloud.py
@@ -115,9 +115,12 @@ async def test_cloud():
                         mock_vefaas_client = Mock()
                         mock_vefaas_in_app.return_value = mock_vefaas_client
                         mock_vefaas_client.delete.return_value = None
-
-                        cloud_app.delete_self()
-                        mock_vefaas_client.delete.assert_called_with("app-123")
+                        with patch.object(
+                            cloud_app, "_get_vefaas_application_id_by_name"
+                        ) as mock_get_id_by_name:
+                            mock_get_id_by_name.return_value = None
+                            cloud_app.delete_self()
+                            mock_vefaas_client.delete.assert_called_with("app-123")
 
                 # Verify all mocks were called as expected
                 mock_vefaas_service.deploy.assert_called_once()
diff --git a/veadk/tracing/telemetry/attributes/extractors/llm_attributes_extractors.py b/veadk/tracing/telemetry/attributes/extractors/llm_attributes_extractors.py
index 379c033a..87d87920 100644
--- a/veadk/tracing/telemetry/attributes/extractors/llm_attributes_extractors.py
+++ b/veadk/tracing/telemetry/attributes/extractors/llm_attributes_extractors.py
@@ -18,6 +18,7 @@
     ExtractorResponse,
     LLMAttributesParams,
 )
+from veadk.utils.misc import safe_json_serialize
 
 
 def llm_gen_ai_request_model(params: LLMAttributesParams) -> ExtractorResponse:
@@ -133,7 +134,7 @@ def llm_gen_ai_prompt(params: LLMAttributesParams) -> ExtractorResponse:
                         else "<unknown_function_name>"
                     )
                     message[f"gen_ai.prompt.{idx}.tool_calls.0.function.arguments"] = (
-                        json.dumps(part.function_call.args)
+                        safe_json_serialize(part.function_call.args)
                         if part.function_call.args
                         else json.dumps({})
                     )
@@ -168,7 +169,7 @@ def llm_gen_ai_completion(params: LLMAttributesParams) -> ExtractorResponse:
                     else "<unknown_function_name>"
                 )
                 message[f"gen_ai.completion.{idx}.tool_calls.0.function.arguments"] = (
-                    json.dumps(part.function_call.args)
+                    safe_json_serialize(part.function_call.args)
                     if part.function_call.args
                     else json.dumps({})
                 )
@@ -289,7 +290,7 @@ def llm_gen_ai_assistant_message(params: LLMAttributesParams) -> ExtractorRespon
                                 else "<unknown_function_name>"
                             )
                             message_part["tool_calls.0.function.arguments"] = (
-                                json.dumps(part.function_call.args)
+                                safe_json_serialize(part.function_call.args)
                                 if part.function_call.args
                                 else json.dumps({})
                             )
@@ -326,7 +327,7 @@ def llm_gen_ai_choice(params: LLMAttributesParams) -> ExtractorResponse:
                     else "<unknown_function_name>"
                 )
                 message["message.tool_calls.0.function.arguments"] = (
-                    json.dumps(part.function_call.args)
+                    safe_json_serialize(part.function_call.args)
                     if part.function_call.args
                     else json.dumps({})
                 )
@@ -351,7 +352,7 @@ def llm_gen_ai_choice(params: LLMAttributesParams) -> ExtractorResponse:
                         else "<unknown_function_name>"
                     )
                     message["message.tool_calls.0.function.arguments"] = (
-                        json.dumps(part.function_call.args)
+                        safe_json_serialize(part.function_call.args)
                         if part.function_call.args
                         else json.dumps({})
                     )
diff --git a/veadk/tracing/telemetry/attributes/extractors/tool_attributes_extractors.py b/veadk/tracing/telemetry/attributes/extractors/tool_attributes_extractors.py
index 3a87a895..20e07717 100644
--- a/veadk/tracing/telemetry/attributes/extractors/tool_attributes_extractors.py
+++ b/veadk/tracing/telemetry/attributes/extractors/tool_attributes_extractors.py
@@ -12,12 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
-
 from veadk.tracing.telemetry.attributes.extractors.types import (
     ExtractorResponse,
     ToolAttributesParams,
 )
+from veadk.utils.misc import safe_json_serialize
 
 
 def tool_gen_ai_operation_name(params: ToolAttributesParams) -> ExtractorResponse:
@@ -27,7 +26,7 @@ def tool_gen_ai_operation_name(params: ToolAttributesParams) -> ExtractorRespons
 def tool_gen_ai_tool_message(params: ToolAttributesParams) -> ExtractorResponse:
     tool_input = {
         "role": "tool",
-        "content": json.dumps(
+        "content": safe_json_serialize(
             {
                 "name": params.tool.name,
                 "description": params.tool.description,
@@ -45,7 +44,7 @@ def tool_gen_ai_tool_input(params: ToolAttributesParams) -> ExtractorResponse:
         "parameters": params.args,
     }
     return ExtractorResponse(
-        content=json.dumps(tool_input, ensure_ascii=False) or "<unknown_tool_input>"
+        content=safe_json_serialize(tool_input) or "<unknown_tool_input>"
     )
 
 
@@ -63,7 +62,7 @@ def tool_gen_ai_tool_output(params: ToolAttributesParams) -> ExtractorResponse:
         "response": function_response["response"],
     }
     return ExtractorResponse(
-        content=json.dumps(tool_output, ensure_ascii=False) or "<unknown_tool_output>"
+        content=safe_json_serialize(tool_output) or "<unknown_tool_output>"
     )
 
 
diff --git a/veadk/utils/misc.py b/veadk/utils/misc.py
index 750ed1a5..f6e35648 100644
--- a/veadk/utils/misc.py
+++ b/veadk/utils/misc.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import importlib.util
+import json
 import sys
 import time
 import types
@@ -81,3 +82,21 @@ def flatten_dict(
         else:
             items.append((new_key, v))
     return dict(items)
+
+
+def safe_json_serialize(obj) -> str:
+    """Convert any Python object to a JSON-serializable type or string.
+
+    Args:
+      obj: The object to serialize.
+
+    Returns:
+      The JSON-serialized object string or <non-serializable> if the object cannot be serialized.
+    """
+
+    try:
+        return json.dumps(
+            obj, ensure_ascii=False, default=lambda o: "<not serializable>"
+        )
+    except (TypeError, OverflowError):
+        return "<not serializable>"