BCG X has released AgentKit, a LangChain-based starter kit designed to facilitate the development of constrained agent applications, which are full-stack and scalable. Built on Next.js 14, FastAPI, and LangChain, AgentKit offers developers a robust foundation for creating applications with a chat interface and a scalable backend. The platform uses "Action Plans" to guide agent actions, ensuring reliability by constraining choices to pre-programmed tasks, which enhances the safety and predictability of outputs. This approach allows for swift prototyping and iteration based on user feedback, accelerating the transition from proof of concept to minimum viable product (MVP). Additionally, AgentKit features pre-built modules for essential functionalities like authentication, monitoring, and caching, and supports comprehensive UI elements to ensure transparency and ease of use for business applications. The tool is particularly useful for BCG’s clients, such as pharmaceutical and automotive companies, in developing and scaling innovative solutions.