LemLab is a modular framework for developing AI agents powered by large language models. Developers can define custom prompt templates, chain multi-step reasoning pipelines, integrate external tools and APIs, and configure memory backends to store conversation context. It also includes evaluation suites to benchmark agent performance on defined tasks. By providing reusable components and clear abstractions for agents, tools, and memory, LemLab accelerates experimentation, debugging, and deployment of complex LLM applications within research and production environments.