add descriptive docstring for the tool set repo

more updates to remove redundant tool import

more updates to remove redundant tool imports

minor fixes during clean up of redundant imports

import tool from langchain_classic.tools

modify the relative position of the executable for chess

add chess tool

minor SyntaxError fix

SerpAPI hardening: For encyclopedic facts, add site:wikipedia.org

SerpAPI hardening: Set defaults: hl='en', gl='us', num=10, engine='google', safe='off'.

rename helper.py to tools.py