Reproduce “SkillTester: Benchmarking Utility and Security of Agent Skills” on OpenResearch

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About this paper

Leye Wang, Zixing Wang, Anjie Xu

SkillTester is presented as a framework for systematically evaluating the utility and security of agent skills. It quantifies a skill's incremental value relative to a no-skill baseline and assesses its security posture through controlled probes, generating a utility score, a security score, and a three-level security status label for informed decision-making.

Key insights

  • Agent skills are active components that significantly alter an agent's capabilities and trust boundaries, requiring dedicated evaluation beyond mere descriptive metadata.
  • Quantifying a skill's true utility necessitates a comparative approach against a baseline to highlight incremental value rather than just raw task success.
  • A structured suite of security probes is crucial to make hidden unsafe behaviors, permission boundary violations, and sensitive data handling issues observable in agent skills.

Summary by alphaXiv.

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