LangServe has been launched to facilitate the deployment of chains and agents by creating a FastAPI server with streaming and batch endpoints, and now includes a playground and configurability for enhanced experimentation and collaboration. The playground feature offers a simple UI for users to change configurable parameters, test different inputs, and view streaming outputs, thus enabling non-technical users to interact with the applications. Configurability is augmented by allowing components to be configurable via LangChain Expression Language, supporting both internal and external applications, and promoting experimentation with different models and retrievers. This approach aligns with emerging common architectures for LLM applications, focusing on retrieval-augmented generation, and aims to simplify initial engineering efforts while encouraging configuration through a graphical user interface for improved collaboration.