Lesson 7 of 9 · 7 min read
Design Patterns That Bound Prompt Injection
Compare six architectural patterns through a worked support-service design. Distinguish planner isolation, committed workflows, bounded outputs and data-flow permissions; examine branches, error feedback, retries and context reduction. Practice tracing source restrictions with an offline example and evaluate the useful work each design preserves.
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Practise it as an interviewer asks it
Why can't an LLM reliably separate instructions from data, and what does that force you to do architecturally?What is prompt injection, and how is it like and unlike SQL injection?Explain the lethal trifecta and use it to triage an agent design in two minutes.How is securing an LLM application different from ordinary application security, and what stays exactly the same?What is a system prompt for, why do attackers target it, and why is it not a security boundary?Direct or indirect prompt injection: how do you compare their risks?