claude-code-from-source

This repository is a free, online technical book spanning 18 chapters and roughly 400 print-equivalent pages, derived from studying TypeScript source maps that Anthropic inadvertently shipped inside Claude Code's npm package. The author recovered the original TypeScript through the `sourcesContent` field of those source maps, then wrote original pseudocode and prose to document the architecture without reproducing proprietary code. Coverage includes Claude Code's six core abstractions, its five-phase bootstrap pipeline, the agent loop in `query.ts`, a 14-step tool execution pipeline, concurrent tool partitioning, multi-agent swarm coordination, a four-layer context compression strategy, file-based memory with LLM-driven recall, MCP integration across eight transports, and terminal UI rendering via a custom Ink fork. A standout detail is the fork-agent prompt cache trick, where parallel sub-agents share byte-identical prefixes to reduce input token costs by roughly 95 percent. The material targets senior engineers building agentic systems, architects evaluating design trade-offs, and anyone who wants a detailed internal view of how Claude Code works.

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