CrewAI is an AI agent library from Replit that makes it easy to build and coordinate groups of specialized AI agents and assistants. It uses modular building blocks so you can create unique agents, assign them tasks, equip them with tools, and manage them in crews. Built on top of LangChain, CrewAI agents can leverage existing capabilities like email sorting and writing, and the agents run natively on Replit’s cloud platform for convenience. The platform already offers several templates that can be replicated, like a trip planning assistant, landing page generator, and more.