CCHISTORY: TRACKING CLAUDE CODE SYSTEM PROMPT AND TOOL CHANGES

Summary from the TLDR AI newsletter

A reverse-engineering project tracking Claude Code's system prompt evolution reveals Anthropic's iterative approach to AI tool development — removing emoji usage restrictions, tightening security policies, and adding PDF reading capabilities across 67 versions. The project bypasses anti-debugging measures to extract prompts, showing how AI companies continuously refine their models' behavior through detailed instruction changes rather than just model updates.