NeMo Guardrails
NVIDIA
Open source guardrails framework for LLM and agent safety with a dedicated Colang DSL.
Curated by Tiberiu ArvaStale
Strengths
- Purpose-built guardrails DSL
- Conversation flow controls
- NVIDIA ecosystem alignment
Practitioner note
Good fit when teams want code-defined conversational and retrieval guardrails they can run themselves, accepting more engineering ownership than a managed service.
Warning
Governance posture
Reviewed 2026-05-26Self-hosted library; residency fully operator-controlled.
SourceOpen-source Python library deployed by the operator; NVIDIA NIM cloud separate. (self-hosted)
SourceNo built-in audit logging; operators add their own.
Self-hosted library; certification applies to the operator.
Self-hosted library; certification applies to the operator's ISMS.
Self-hosted library; applies to the operator.
OSS library component; deployers carry obligations for systems they build. (role: not-applicable)
Apache-2.0 — permissive, OSI-approved. (low)
SourceEU AI Act obligations
Risk tier: Not applicable · as of 2026-08-23Source-backed information mapped from NeMo Guardrails's tracked risk tier — not legal advice. Obligations depend on how your organisation deploys the system; see the full obligation reference and timeline.
This record's EU AI Act risk tier is marked not applicable, so no tier-specific obligations attach. Deployers embedding it in an AI system in scope of the Act should assess that system's own tier.
Change history
Source-backed and auto-detected events for this tool, newest first.
- ReleaseHigh impact
NeMo Guardrails 0.23.0 expanded IORails with streaming and non-streaming tool-call validation, added a standalone /v1/checks validation endpoint, and improved OpenTelemetry observability for production guardrail pipelines.
Release v0.23.0 · NVIDIA-NeMo/Guardrails - ReleaseNeMo Guardrails adds parallel IORails safety execution
NeMo Guardrails' March 12 release introduced IORails for parallel input/output safety execution, plus OpenAI-compatible server support and standalone async rail validation.
Releases · NVIDIA-NeMo/Guardrails - Auto-detectedgithubStars: 6661 → 6869
From snapshot diff 2026-07-17 → 2026-08-04.
- Auto-detectedgithubStars: 6367 → 6661
From snapshot diff 2026-06-07 → 2026-07-17.
- Auto-detectedlastRelease: 2026-05-22 → 2026-07-01
From snapshot diff 2026-06-07 → 2026-07-17.
- Auto-detectedversion: 0.22.0 → 0.23.0
From snapshot diff 2026-06-07 → 2026-07-17.
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