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Runtime Defense for LLM Agents: What Changes

A paper published on arXiv on 13 August 2026 introduces HARD, a self-evolving runtime defense framework for LLM agents that replaces manual interventions with an autonomous loop driven by failure traces. This desk analyzes the harness-level mechanism, the structural limit of handcrafted defenses, and the implications for AI security posture, multi-agent systems, and the build/buy decisions of the next planning cycle.

The skinny

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