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Skill cascading attacks evade agent scanners across 213 test cases on Claude Code, Codex

A study of 213 validated test cases found that malicious behavior split across multiple individually benign agent skills can evade per-skill scanners and runtime monitors on systems including OpenClaw, Claude Code, and Codex, emerging only when the skills execute together. The research, posted to arXiv, indicates that component-level review is insufficient for agents that load third-party or modular skills, and that policy and testing must model cross-skill data flow, ordering, and combined effects before skills are allowed to compose in production.

read1 min views1 publishedSep 28, 2026
Skill cascading attacks evade agent scanners across 213 test cases on Claude Code, Codex
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arXiv

Skill cascading attacks evade agent scanners across 213 test cases on Claude Code, Codex

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213 validated test cases show that malicious behavior can be split across multiple “benign” agent skills and reliably emerge only when the skills execute together, bypassing per-skill scanners and runtime monitors on systems including OpenClaw, Claude Code, and Codex. If you ship agents that load third-party or modular skills, component review is insufficient: you need policy and testing that model cross-skill data flow, ordering, and combined effects before allowing skills to compose in production.

Mistral Large quota or rate limit — check usage and plan. Original headline: Stealth Apart, Harm Together: Skill Cascading Attacks on Skill-Based Agent Systems

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