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An agent reads untrusted web content and tool output. How do you defend against prompt injection?

Any content an agent reads can carry instructions that hijack it. The signal is knowing why filtering can't fully solve injection and which containment controls actually bound the damage when it succeeds.

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

Any content an agent reads can carry instructions that hijack it. The signal is knowing why filtering can't fully solve injection and which containment controls actually bound the damage when it succeeds.

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