Bug: AttributeError: 'str' object has no attribute 'text' during stream_graph

[Iamsdt]

When executing GraphService.stream_graph, the process fails during thread-name generation because messages_str contains plain strings rather than objects with a .text attribute. This results in the following exception:

AttributeError: 'str' object has no attribute 'text'

Where It Occurs

Inside graph_service.py:

if meta["is_new_thread"] and self.config.thread_name_generator_path:
    messages_str = [msg.text() for msg in messages_str]
    thread_name = await self._save_thread_name(
        config, config["thread_id"], messages_str
    )
    meta["thread_name"] = thread_name

What’s Happening

Earlier in the stream handler, messages_str is populated with chunk.message.text(), converting entries into raw strings.
Later, the thread-name generator assumes each item is a message object and tries to call .text() again, causing the failure.

Expected Behavior

Thread naming should work regardless of whether messages are:

• model objects
• plain strings

Actual Behavior

Execution crashes with:

AttributeError: 'str' object has no attribute 'text'

Additional Notes

Pydantic V2.11 deprecation warnings also appear, though unrelated.