SkillBench Is the Quality Benchmark for Agent Skills

Agentic AI has evolved through the introduction of "skills," which are essentially sets of markdown instructions that enable workflows to be easily shared and adopted across enterprises. Since their introduction by Anthropic in 2025, the number of published skills has grown significantly, but the rapid expansion has raised concerns about quality control. To address this, SkillBench was developed to assess and grade these skills based on six weighted dimensions, including safety, tool boundary, and workflow quality, among others. Safety is the most critical factor, accounting for 35% of the total score, as the potential for real-world business impact is significant. Of the 39,000 skills scored, 73% showed elevated safety risks, with 7,034 failing due to serious security issues. Despite these challenges, 20% of skills received high grades, indicating that improvements in tool boundaries and transparency can enhance overall quality. Users are advised to filter and evaluate skills carefully before implementation, while developers are encouraged to score and refine their skills using SkillBench to ensure safety and reliability in the evolving ecosystem of agentic AI.

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