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What DeNA's Perl-to-Go Migration Reveals About the Value of Code-Independent Design Records

Migrating a 6,000-line legacy Perl API to Go, powered by AI agents. A case study published on DeNA's engineering blog paints a vivid picture of both the promise…

Start with Plan Mode: Spec-Driven Development for AI Coding Beginners

When people first start using AI coding tools, the instinct is almost always to jump straight into implementation: "Build a login feature," "Add …

Why AI Coding Review Takes Longer: What's Happening Behind 10x Faster Implementation

Adopting a coding agent makes development faster. That's not wrong per se. Looking at implementation speed alone, 10x or more compared to hand-written code isn'…

Is Loading Everything into CLAUDE.md Really the Best Practice?

Project rules, architecture overviews, style guides, tool configurations — it's tempting to dump everything into CLAUDE.md, thinking "the AI will read it a…