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implementing-llm-guardrails-for-security

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Implements input/output validation guardrails for LLM applications using NVIDIA NeMo Guardrails (Colang), custom Python validators for PII detection, and the Guardrails AI framework, intercepting user inputs (prompt injection, PII, off-topic queries) and model outputs (hallucinations, toxic content, schema compliance). Use when adding safety controls to an LLM app/chatbot/RAG pipeline or validating outputs conform to expected schemas.

skills/implementing-llm-guardrails-for-security/SKILL.md

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Aug 31, 2026
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# Implementing LLM Guardrails for Security

## When to Use

- Deploying a new LLM-powered application that processes user input and needs input/output safety controls
- Adding content policy enforcement to an existing chatbot or AI agent to comply with organizational policies
- Implementing PII detection and redaction in LLM pipelines handling sensitive customer data
- Building topic-restricted AI assistants that must refuse off-topic or disallowed queries
- Validating that LLM responses conform to expected schemas before they reach downstream systems or users
- Protecting RAG pipelines from indirect prompt injection in retrieved documents

**Do not use** as a replacement for proper authentication, authorization, and network security controls. Guardrails are a defense-in-depth layer, not a perimeter defense. Not suitable for real-time content moderation of user-to-user communication without LLM involvement.

## Prerequisites
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