Python: Fix structured value parsing for split text chunks

python/packages/core/agent_framework/_types.py

@@ -2191,7 +2191,7 @@ def _last_non_empty_assistant_message_text(messages: Sequence[Message]) -> str:
     for message in reversed(messages):
         if message.role != "assistant":
             continue
-        text = message.text
+        text = "".join((content.text or "") for content in message.contents if content.type == "text")
         if text.strip():
             return text
     return ""

python/packages/core/tests/core/test_types.py

@@ -884,6 +884,17 @@ def test_chat_response_with_mapping_response_format() -> None:
     assert response.value["response"] == "Hello"
 
 
+def test_chat_response_value_parses_split_structured_text_without_changing_message_text() -> None:
+    """ChatResponse.value should not use Message.text spacing between structured output chunks."""
+    message = Message(role="assistant", contents=[Content.from_text('{ "respon'), Content.from_text('se": "Hello" }')])
+    response = ChatResponse(messages=message, response_format=OutputModel)
+
+    assert message.text == '{ "respon se": "Hello" }'
+    assert response.text == '{ "respon se": "Hello" }'
+    assert response.value is not None
+    assert response.value.response == "Hello"
+
+
 def test_chat_response_value_parses_final_message_with_response_format() -> None:
     """ChatResponse.value should ignore intermediate messages when parsing structured output."""
     response = ChatResponse(
@@ -899,6 +910,17 @@ def test_chat_response_value_parses_final_message_with_response_format() -> None
     assert response.value.response == "Hello"
 
 
+def test_agent_response_value_parses_split_structured_text_without_changing_message_text() -> None:
+    """AgentResponse.value should not use Message.text spacing between structured output chunks."""
+    message = Message(role="assistant", contents=[Content.from_text('{"response": "Hel'), Content.from_text('lo"}')])
+    response = AgentResponse(messages=message, response_format=OutputModel)
+
+    assert message.text == '{"response": "Hel lo"}'
+    assert response.text == '{"response": "Hel lo"}'
+    assert response.value is not None
+    assert response.value.response == "Hello"
+
+
 def test_agent_response_value_parses_final_message_with_response_format() -> None:
     """AgentResponse.value should ignore intermediate messages when parsing structured output."""
     response = AgentResponse(
@@ -914,6 +936,14 @@ def test_agent_response_value_parses_final_message_with_response_format() -> Non
     assert response.value.response == "Hello"
 
 
+def test_chat_response_value_handles_text_content_without_text() -> None:
+    """ChatResponse.value should ignore text content with no text value."""
+    message = Message(role="assistant", contents=[Content.from_dict({"type": "text"})])
+    response = ChatResponse(messages=message, response_format=OutputModel)
+
+    assert response.value is None
+
+
 def test_agent_response_mapping_value_parses_final_message() -> None:
     """AgentResponse.value should parse the final message for JSON schema mappings."""
     response = AgentResponse(