Tool integration has been an important research area for many years after software engineering became a key player in information industry. With the Internet establishing ubiquitous connectivity, more and more tools become reachable through the Internet. The Internet has massively changed the environment of software engineering. This paper extensively discusses relevant technologies of tool integration for Internet-based e-commerce. A new framework of tool integration for Internet-based e-commerce is proposed designed and demonstrated. An XML-based message server can effectively serve tool integration for Internet-based e-commerce within a business/integration domain.