Claude system prompts as a git timeline

This article describes a project that converts Anthropic's published system prompts for Claude into a git-based exploration tool. The monolithic markdown source is broken into granular files and timestamped commits per model, family, and revision. Researchers can use git log, diff, and blame to trace prompt evolution, compare differences, and attribute changes to specific dates without manual parsing. The author used Claude Code to create separate files with fake commit dates for browsing via GitHub commit view, and applied this to analyze changes between Opus 4.6 and 4.7. This is a technical tutorial on prompt engineering and version control for AI systems.