What keyword argument is added to the chat function to include a JSON schema specification for tools?	tools
What is the purpose of the `tool_config` dictionary within the tool specification?	It controls how the model makes use of the provided tools.
What does setting the `auto` option in `tool_config` mean?	It is the default setting, delegating the choice of whether or not to use a tool to Claude itself.
What is the `stop_reason` when a model decides it needs to call a tool?	`tool_use`
How does the structure of the assistant message change when a tool is used?	It contains a content list with multiple parts, including a `text` part and a `tool_use` part.
What are the two primary keys found within the `tool_use` part of an assistant message?	`name` (the tool's name) and `input` (a dictionary of arguments).
What is the requirement for the follow-up request after a tool use has been triggered?	The entire conversation history, including the tool use response, must be included.
Why was the `add_assistant_message` function refactored?	To support passing in messages that are a list of multiple parts, rather than just a single string of text.
What is the alternative setting in `tool_config` that forces Claude to use any available tool?	`any`
What must be extracted from the chat function response to correctly build the conversation history after tool use?	The text from the first part and the list of all message parts up to the content key.