The RAG Logger is a newly developed, open-source logging tool tailored for Retrieval-Augmented Generation (RAG) applications. Unlike LangSmith, which is designed for production observability, RAG Logger focuses on lightweight, local usage that allows developers to customize their logging experience. Key features include detailed tracking of the RAG pipeline, performance monitoring of various stages, structured JSON log outputs, and easy integration with existing systems, all while requiring no external dependencies. The creation of RAG Logger caters to developers looking for more control and simplicity in their debugging processes.