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How do tool-result and memory poisoning attacks compromise an AI agent, and how do you defend?

An agent that trusts its tools and its own memory can be steered by a single poisoned record that resurfaces turns or sessions later. The signal is seeing persistent state as an attack surface, not just the live prompt.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

An agent that trusts its tools and its own memory can be steered by a single poisoned record that resurfaces turns or sessions later. The signal is seeing persistent state as an attack surface, not just the live prompt.

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