Add book review: AI Engineering by Chip Huyen

- Add new blog post (post-8.md) reviewing "AI Engineering" by Chip Huyen
- Discuss importance of AI evaluation processes and criteria
- Cover prompt engineering best practices and "Keep It Simple" principle
- Highlight book's value as a reference guide for AI application development

src/blog/post-8.md

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+---
+title: 'A Compass for AI Application Development: Reading "AI Engineering"'
+pubDate: 2026-01-25
+author: 'Nakahara Daisuke'
+tags: ["Book", "AI"]
+---
+
+This is a brief book review of "AI Engineering" (Japanese edition) by Chip Huyen, published by O'Reilly Japan.
+The book provides a detailed explanation of the essential and typical processes for **AI Engineering**—building applications using AI models.
+Topics include "foundation model use cases," "evaluation methods," "evaluation criteria," "prompt engineering," "RAG," and "agents."
+
+
+Through this book, I learned about AI evaluation processes in an environment where foundation models are frequently updated and consistency is difficult to maintain.
+The author states, "I am convinced that evaluation is the biggest bottleneck in AI adoption."
+Rather than simply deploying AI, the book proposes evaluating AI applications by categorizing them into evaluation criteria: "domain-specific capabilities," "generation capabilities," "instruction-following capabilities," and "cost and latency."
+Since AI can make mistakes, without proper evaluation, it becomes difficult to differentiate AI applications from others, and there is a risk of user churn due to declining trust.
+Therefore, a book that teaches evaluation operations was highly beneficial.
+
+
+Regarding prompt engineering, the book recommends following the "Keep It Simple" principle and, in the initial stages of prompt creation, starting by writing prompts yourself without relying on tools or AI models.
+Since I often had AI models write prompts for me, I felt motivated to develop my own skills following the book's advice, especially in those early stages.
+
+
+Given the extensive content of this book, it was difficult to understand everything from just one reading.
+However, because it is well-organized, the book serves as a dictionary-like reference that can be consulted when stuck during AI application development.
+
+---
+
+> **Note**: The review and translation were assisted by an AI generative model. The author is responsible for the final content.