Model Tool Calls not persisted in chat memory

[JonnySpruce]

Bug description
When adding a MessageChatMemoryAdvisor to my chat client. I would expect it to persist all messages, including the tool calls that the model makes. However, when getting the final chatResponse, I can only see the user message and the final model response in the chat memory.

Environment
Java 21, SpringAI M4, InMemoryChatMemory

Steps to reproduce

1. Create a chat client with at least one tool call and add a MessageChatMemoryAdvisor with an InMemoryChatMemory instance passed in to it.
2. Make a user query which invokes the tool call
3. Investigate the ChatMemory instance and see that only the user input and the model response are included in the history.

Expected behavior
I expected to also be able to see the model tool calls in the ChatHistory