NVIDIA NeMo Guardrails

About NeMo Guardrails

NeMo Guardrails is an open-source toolkit by NVIDIA for easily adding programmable guardrails to LLM-based conversational applications. Guardrails control the output of LLMs — blocking off-topic content, preventing jailbreaks, masking PII, and following predefined dialog paths.

Features

• Content safety guardrails (input/output moderation)
• Jailbreak protection (self-check, heuristic detection, NVIDIA NemoGuard)
• Topic control (restrict conversations to allowed topics)
• PII detection and masking
• Dialog rails (predefined conversational flows via Colang)
• Integration with LlamaGuard, ActiveFence, Cisco AI Defense
• LangChain integration

Installation

pip install nemoguardrails