Claude Unleashed

The Complete Guide to Building With Claude Code

"We didn't set out to write a love letter. We set out to analyze source code."

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495,000 words. 18 chapters. 7 appendices. Every claim cited from source code.

On March 31, 2026, the full source code of Anthropic's Claude Code CLI was accidentally leaked via a .map file in their npm registry — 510,000 lines of unobfuscated TypeScript, downloadable for 72 hours before Anthropic closed the link.

This book exists because of that accident.

We read every line. We documented what we found. And we wrote the most comprehensive guide to Claude Code ever written — with exact file:line citations for every technical claim.

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Who This Book Is For

Non-technical readers (Chapters 1–3) — Teachers, managers, lawyers, doctors, anyone who wants to use Claude Code to build tools without writing code.

Developers (Chapters 4–6) — Rate limit strategies, settings deep dives, multi-agent workflows for shipping real products.

AI builders (Chapters 7–10) — Source code analysis, platform extensibility, what Anthropic is building next (it's in the feature flags).

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Table of Contents (Free Previews)

Chapter	Words	Free Preview
Preface: The Leak Story	5,063	~40% free
Ch 1: What Is Claude Code, Really?	44,020	First 2,000 words
Ch 2: The Memory Garden	45,041	First 2,000 words
Ch 3: Fifty Transformations	50,184	First 2,000 words
Ch 4: The Rate Limit Survival Guide	40,038	First 2,000 words
Ch 5: The Settings That Change Everything	45,069	First 2,000 words
Ch 6: Shipping Products With an AI Team	45,010	First 2,000 words
Ch 7: 510,000 Lines of Brilliance	60,037	First 2,000 words
Ch 8: Building on the Platform	39,716	First 2,000 words
Ch 9: When Everyone Can Build	33,997	First 2,000 words
Ch 10: A Love Letter	25,015	First 2,000 words
Appendix A: settings.json Reference	15,023	First 2,000 words
Appendix B: Feature Flags Decoded	10,058	First 2,000 words
Appendix C: All 18 Buddy Species	8,063	First 2,000 words
Appendix D: CLAUDE.md Templates	8,010	First 2,000 words
Appendix E: Architecture Map	8,451	First 2,000 words
Appendix F: Cost Calculator	6,089	First 2,000 words
Appendix G: Hidden Commands Catalog	6,540	First 2,000 words

Total: 495,425 words

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Get the Full Book

$29.99 on Gumroad — Full PDF + ePub, free updates forever.

Pay what you want (minimum $19.99).

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What Makes This Different

Every other Claude Code guide is based on documentation and experimentation.

This one is based on source code.

• src/services/compact/autoCompact.ts:33 — the exact line where context compaction triggers
• src/buddy/companion.ts — SALT = 'friend-2026-401' — April Fool's Day hidden in a hash function
• src/services/PromptSuggestion/speculation.ts — the overlay filesystem that previews file edits before you approve them
• src/utils/permissions/permissions.ts:473-1057 — the 3-phase, 8-source permission decision tree

When we say "here's how Claude Code works," we mean it literally.

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About the Source

The source code used for research in this book was the leaked claude-code npm package source map from March 31, 2026. It has since been patched by Anthropic. This book is an independent analysis and is not affiliated with Anthropic.

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Found a mistake? Open an issue. Want to contribute? PRs welcome for typos and factual corrections.