diff --git a/src/google/adk/code_executors/agent_engine_sandbox_code_executor.py b/src/google/adk/code_executors/agent_engine_sandbox_code_executor.py
index f601d045..69d1778a 100644
--- a/src/google/adk/code_executors/agent_engine_sandbox_code_executor.py
+++ b/src/google/adk/code_executors/agent_engine_sandbox_code_executor.py
@@ -134,8 +134,8 @@ class AgentEngineSandboxCodeExecutor(BaseCodeExecutor):
           or 'file_name' not in output.metadata.attributes
       ):
         json_output_data = json.loads(output.data.decode('utf-8'))
-        stdout = json_output_data.get('stdout', '')
-        stderr = json_output_data.get('stderr', '')
+        stdout = json_output_data.get('msg_out', '')
+        stderr = json_output_data.get('msg_err', '')
       else:
         file_name = ''
         if (
diff --git a/tests/unittests/code_executors/test_agent_engine_sandbox_code_executor.py b/tests/unittests/code_executors/test_agent_engine_sandbox_code_executor.py
index c9480601..6022527f 100644
--- a/tests/unittests/code_executors/test_agent_engine_sandbox_code_executor.py
+++ b/tests/unittests/code_executors/test_agent_engine_sandbox_code_executor.py
@@ -71,7 +71,7 @@ class TestAgentEngineSandboxCodeExecutor:
     mock_json_output = MagicMock()
     mock_json_output.mime_type = "application/json"
     mock_json_output.data = json.dumps(
-        {"stdout": "hello world", "stderr": ""}
+        {"msg_out": "hello world", "msg_err": ""}
     ).encode("utf-8")
     mock_json_output.metadata = None