LongTracer: Cost-Free Hallucination Verification at Inference Time

RAG hallucination detection has evolved from a model problem to a production engineering challenge demanding continuous monitoring. LongTracer provides cost-free, deterministic hallucination verification at inference time without API calls or cloud dependencies. As enterprises scale RAG systems across legal, medical, and financial domains, this open-source approach offers a fundamentally different solution to existing observability platforms—enabling proactive quality gates instead of post-hoc evaluation.