🔗 Reading a 200k-line codebase you didn't write: a field guide

Is it really possible to understand a sprawling 200,000-line codebase that someone else authored? Christoph Beck's article presents a practical guide to tackling inherited code through a systematic approach. Starting without diving directly into the files, Beck emphasizes the importance of first interpreting the project's structure, including the directory tree, dependency manifests, CI configuration, and git history.

By pairing human intuition with coding agents, developers can uncover insights about the codebase's history and current state. The article details how to analyze project components efficiently, looking for clues that highlight the team’s practices and any lurking issues. With quick commands and thoughtful interpretation, readers gain a comprehensive understanding of how a legacy codebase functions before they read a single line of code.