I Built a Security Scanner Because AI Code Scared Me

Two months ago, I was selling Claude Code skills on Qiita. I had 75,000 page views. Zero paid purchases. Today, I have a working SaaS that scans AI-generated code for security vulnerabilities. I built the entire MVP in one day. This is the story of how a failed product led me to a real one. The Pivot: From Skills to SaaS I spent a month creating and selling Claude Code skills — reusable prompt templates and workflows. The results were brutal: 75,000+ page views on Qiita (Japanese dev platform) 49 technical articles published 0 paid purchases The market analysis told the story: the Claude Code Skills paid marketplace had accumulated only $1,400 in total sales across all sellers. The paid market simply didn't exist yet. But I had something valuable: a security scanner skill with 14 detection categories and 95+ vulnerability check items. It was the most comprehensive piece I'd built. And people kept reading the articles about it. That's when it clicked: don't sell the skill as a file. Sel