A Sierra-signature scenario where 'put it in the system prompt' scores zero. The winning answer is defense-in-depth with a measured catch-rate per layer, plus an honest number for what still gets through.
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A brand wants an agent that never gives financial advice, stays on-voice, and never mentions competitors. Design the guardrails.
A Sierra-signature scenario where 'put it in the system prompt' scores zero. The winning answer is defense-in-depth with a measured catch-rate per layer, plus an honest number for what still gets through.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
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