In practice this means function calling - the LLM chooses the function to call (and its parameters). Usually in a loop with a 'finish' function that returns the

In practice this means function calling - the LLM chooses the function to call (and its parameters). Usually in a loop with a 'finish' function that returns the control to the outside code. You can do that without function calling - as did the original ReAct paper - but then you have to write your own grammar for the communication with the LLM, a parser for it, and also you need to teach the LLM to use that grammar. This is very time consuming.