AI agents are becoming increasingly prevalent in various applications, from simple chatbots to more complex problem-solving tools. CrewAI is a library designed to build and orchestrate groups of AI agents, leveraging LangChain for compatibility with existing tools. It provides a modular framework with four main building blocks: Agents, Tasks, Tools, and Crews, allowing developers to create tailored solutions for different use cases. By integrating CrewAI with Replit, users can easily deploy and test their agents on the cloud, making it easier to get started and debug their applications. The library's flexibility and visibility features make it an attractive option for developers seeking to build custom AI-powered tools.