SkillAlchemy: Open-World Agent Skill Creation

TL;DR - SkillAlchemy is a source-grounded framework that automatically creates reusable agent skills from underspecified briefs and open-world materials. It approaches human-curated performance while substantially improving task success over existing automated methods.

• Identifies requirements omitted from skill briefs using contrastive evidence gathered from permitted sources.
• Admits candidate procedures only within the scope justified by supporting evidence.
• Compiles approved procedures into grammar-guided skill packages for inference-time use.
• Across 87 SkillsBench v1.1 tasks, it improved pass rate by 19.9 percentage points over no-skill execution and 8.6 points over the strongest automated baseline.