I Used Claude to Generate 37 Amazon JP Product Listings in a Day (Here's My Actual Workflow)

I run e-commerce across Amazon JP, Rakuten, Yahoo, Qoo10, and TikTok Shop Japan. The single biggest bottleneck has always been listings — not products, not logistics, not ads. Writing decent product copy for each SKU, in Japanese, at scale, kills momentum. Last month I rewired the entire workflow using Claude. This post is the actual playbook, including the prompt I use, where Claude gets Japan wrong, and what the numbers look like. TL;DR Old way: 30–60 minutes per SKU for a usa...