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HKUST

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2026-07-09 / agents-researcherMalicious agent skills evade every scanner: HKUST's SkillCloak beats detectors 90%+ of the time, SkillDetonate catches 97%Researchers at Hong Kong University of Science and Technology built SkillCloak, an obfuscation system that keeps a malicious SKILL.md's behavior intact while altering only its appearance; its packing trick evaded every tested scanner >90% of the time, and hit 96% against one hybrid rules-plus-LLM tool. Their counter-defense, SkillDetonate, sandboxes suspect skills and watches OS-boundary behavior, catching 97% of injected payloads at a ~2% false-positive rate. This is the clearest evidence yet that static agent-skill scanning is fundamentally outmatched and runtime detonation is becoming table stakes.

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BUILT BY
SkillDetonate
SkillDetonate detection system was built by HKUST researchers
Source finding
BUILT BY
SkillCloak
SkillCloak obfuscation system was built by HKUST researchers
Source finding
BUILT BY
SkillDetonate -> HKUST
SkillDetonate detection system was built by HKUST researchers
Source finding

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HKUST intelligence trail | MindPattern