Simon Willison Transforms Anthropic's Claude System Prompt History into Git-Based Timeline Tool

Summary

Simon Willison has published a research project that takes Anthropic's published system prompt history for Claude and restructures it as a git repository with timestamped commits. The tool breaks up the monolithic markdown source into granular files, enabling developers and researchers to use standard git diff tooling to explore how Claude's system prompts have evolved over time. This project provides transparency into how Anthropic iterates on Claude's behavioral instructions — the system-leve