lumen

Lumen is an open-source command-line developer tool that enhances Git workflows by combining advanced diff visualization with AI-powered code assistance. The tool provides an ergonomic interface for reviewing code changes directly in the terminal, offering syntax-highlighted diffs and structured output to make change analysis easier. In addition to displaying differences between commits, Lumen integrates AI services that can explain code changes, generate commit messages, and assist with Git operations. The platform supports multiple AI providers, allowing developers to connect to models from services such as OpenAI, Claude, Groq, or locally hosted inference engines. It also includes interactive exploration features that allow users to search through commits and understand the history of changes in a repository. Because it runs entirely from the command line, the tool integrates seamlessly into existing Git workflows without requiring graphical interfaces or additional IDE plugins.