Improve langchain tool example #265
Description
Feedback on the notebook/agentchat_langchain.ipynb
Clarify the path of Test.txt. In my run, I had to place in cwd even when work_dir is set to coding. (Mac with python 3.11)
Spark example requires setting up key differently from circumference example. It would be great if the reader has to set everything in the beginning once. Some paths are hardcoded.