Langchainrb is an open-source Ruby library designed to streamline the development of AI-driven applications by offering a modular framework for agents, chains, and tools. Developers can define prompt templates, assemble chains of LLM calls, integrate memory components to preserve context, and connect custom tools such as document loaders or search APIs. It supports embedding generation for semantic search, built-in error handling, and flexible configuration of models. With agent abstractions, you can implement conversational assistants that decide which tools or chain to invoke based on user input. Langchainrb's extensible architecture allows easy customization, enabling rapid prototyping of chatbots, automated summarization pipelines, QA systems, and complex workflow automation.