How Guardrails Work

The NeMo Guardrails toolkit applies guardrails at multiple stages of the LLM interaction.

Stage	Rail Type	Common Use Cases
Before LLM	Input rails	Content safety, jailbreak detection, topic control, PII masking
After LLM	Output rails	Response filtering, fact checking, sensitive data removal
RAG pipeline	Retrieval rails	Document filtering, chunk validation
Tool calls	Execution rails	Action input/output validation
Conversation	Dialog rails	Flow control, guided conversations