Claude Code's Architecture Exposed: What 510,000 Lines of Code Reveal About AI Product Design

Decompiled Claude Code reveals an unexpectedly large and modular system with over 510,000 lines of TypeScript—not a simple CLI but a full-featured AI development environment. Notably, significant portions of the system prompt logic and tool management run on the client side, challenging common assumptions that AI orchestration must happen server-side and providing insights into how AI products balance client intelligence with server control.