Why Handwritten SKILL.md Fails: SkillOpt Trains Prompts and Wins All 52 Benchmarks
Microsoft's new SkillOpt paper shows that treating a hand‑written SKILL.md file as trainable parameters and iterating it 50+ times outperforms every human‑crafted version across 52 comparisons, delivering up to 24.8‑point gains in Claude Code, GPT‑5.5, and Codex environments.
