SkillOpt optimizes AI agent skills as editable markdown playbooks, boosting SpreadsheetBench performance by 8.5 points

very cool work "the first systematic controllable text-space optimizer for agent skills: a separate optimizer model turns scored rollouts into bounded add/delete/replace edits on a single skill document, and an edit is accepted only when it strictly improves a held-out validation score." https://arxiv.org/abs/2605.23904