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Guardrails for LLM Apps: Input/Output Filtering Patterns (ANSWERED)

Scenario BasedLLMsMedium15 min read

Scenario question on LLM guardrails — prompt injection defense, output validation, NeMo/Guardrails patterns, and policy layers.

TL;DR — Quick Answer

Guardrails wrap the LLM with deterministic and ML checks. Input: injection detection, PII scrubbing, topic allowlists, max length, canonicalization. Output: schema validation, toxicity/PII scanners, citation verification, regex for secrets, refusal templates, human escalation triggers. Layer defenses — don't rely on system prompt alone. Log blocked events; tune false positive rate with human review; separate safety policy from business logic validators.

The Interview Question

Design guardrails for an LLM application. What input and output filtering patterns do you use in production?

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GuardrailsSafetyPrompt InjectionValidationProductionAnthropicMicrosoftOpenAI