Rail types

Input rails (before LLM), dialog rails (steer conversation), retrieval rails (moderate RAG), execution rails (moderate tool use), output rails.

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Colang DSL

Domain-specific language for defining flows + rails. Human-readable. Model both LLM behavior + rule-based checks.

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Fact-checking rail

Cross-check LLM claims against context. Refuse or flag ungrounded assertions.

Integration

LangChain, LlamaIndex, direct LLM APIs. Compatible with major providers.