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Xin Fan Guo

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APEX: Active Protection at Execution Boundaries for LLM Agents

Xinran Zheng, Xin Fan Guo, Zhiqiang Hao وآخرون · 2026

Indirect prompt injection (IPI) hides adversarial instructions in content that large language model (LLM) agents read at runtime. As agents compose heterogeneous capability units, including Tools, MCP servers, and Skills, the carriers of injection multiply, and defenses built to recognize attack patterns fall behind th …

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