Porting Anthropic's Skill Creator from Python to TypeScript

Anthropic's skill-creator for Claude Code is excellent. It introduced eval-driven development for AI agent skills — write a skill, test it with evals, optimize the description, benchmark the results. The methodology is proven. But it has a limitation: it only works with Claude Code, and skill access requires a paid subscription ($20/month minimum). Free tier users can't use it at all. OpenCode is free and supports 300+ models. I wanted to bring the same methodology to OpenCode users — for free...