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Your agent reads emails and can issue refunds. Harden it against prompt injection.

Untrusted content plus write-capable tools is the lethal combination. Prompt-level defenses alone fail this question; the winning answer is an architecture where injection succeeding still can't move money.

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

Untrusted content plus write-capable tools is the lethal combination. Prompt-level defenses alone fail this question; the winning answer is an architecture where injection succeeding still can't move money.

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