Show HN: I wrote a book on using AI in game design production (free on GitHub) (github.com)

Minsoo Lee, an experienced game designer and the former lead of Ragnarok Online, has released a comprehensive field manual titled "No Fabricated Numbers" that details the practical application of generative AI (Claude Code) in game design and production. Available for free on GitHub, this book takes readers through various aspects of game development, from initial setups like installation and pricing to more complex topics such as systems design, narrative creation, and combat balance. Each chapter emphasizes real-life applications and workflows, ensuring that all numbers and cases presented are derived from actual work rather than hypothetical scenarios. The significance of this manual lies in its focused approach to using AI as a valuable tool in industry workflows, with insights applicable beyond game design. It introduces structured methodologies like schema-first data design and validation gates to prevent AI-generated errors, helping teams manage costs effectively and streamline decision-making processes. Furthermore, the book is designed for collaborative as well as solo developers, offering guidance for enforcing quality and efficiency across various stages of production, which could benefit a wide array of professions by improving productivity and decision accuracy in creative environments.