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NeMo Guardrails

Guardrails Open source (Apache 2.0)

GitHub stars7.3k
Forks876
Last activityOct 20, 2026
Open issues269

Repository: NVIDIA-NeMo/Guardrails ยท Data checked Oct 2026

About

NeMo Guardrails sits between your users and your agent, intercepting inputs, model outputs, and tool calls to block anything unsafe, off-topic, or policy-violating. You define the rules in a simple configuration language: what the agent may never say, which topics are out of bounds, which tool calls need approval. It is NVIDIA's open-source answer to the question every agent builder eventually asks, which is how to ship an agent you actually trust. Apache 2.0, pip install, runs wherever your agent runs.

Details

Open source. You run it yourself.

Auth: Open source (Apache 2.0)

Rate limit: None, runs locally

Verified: 2026-09-19

Best for: developer business

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Setup

  1. Run pip install nemoguardrails
  2. Define your first rails: blocked topics, allowed tools, output checks
  3. Wrap your agent so every input and output passes through the rails
  4. Test with adversarial prompts and tighten the config
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