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Acknowledgment

This book builds on the author's blog posts #46 'From Claude Code to Codex' and #7 'Markdown as External Memory'.

Thanks to Anthropic and OpenAI for their official docs, and to Andrej Karpathy for publicly demonstrating the Obsidian + Claude Code workflow.

The first month of post-GPT-5.5 discussions on r/ClaudeAI, r/OpenAI, r/cursor and HackerNews form the backbone of Part III.

This project was built using the Harness skill by Minho Hwang.

AI tools were used in the production of this work: Claude (Opus 4.6) for literature survey, content generation, and manuscript preparation.