Inside Claude Code’s 512K-Line Leak: How Its AI Coding System Is Built
The accidental source‑map release of Anthropic’s Claude Code on March 31 2026 exposed 512 000 lines of TypeScript, revealing a five‑layer architecture, a sophisticated prompt‑memory split, a 40‑plus‑tool ecosystem, multi‑agent coordination, and hidden feature‑flags that together illustrate how a top‑tier AI coding agent is engineered as a full‑stack runtime rather than a simple model wrapper.
