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What is indirect prompt injection, and why is it so dangerous for RAG and agents?

Direct injection is the user attacking the prompt. Indirect injection hides the attack inside a page, doc, or email the model reads. The signal is realizing retrieved and tool data is untrusted and can hijack the model. Here is the answer.

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

Direct injection is the user attacking the prompt. Indirect injection hides the attack inside a page, doc, or email the model reads. The signal is realizing retrieved and tool data is untrusted and can hijack the model. Here is the answer.

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