Contextual Retrieval: The Preprocessing Step That Makes RAG Actually Work

We all know the frustration. You build your RAG pipeline, fire your first query, and get back answers that are technically correct but completely useless. Why? Because a raw chunk reading “500mg dosage, twice daily” means absolutely nothing in isolation. Is that Ibuprofen? Metformin? Warfarin? Your retrieval system has no idea. Now imagine an AI that wraps that chunk with “this is the dosage for Metformin, from a Type 2 Diabetes management guideline” - before it ever hits your index. That’s Contextual Retrieval Preprocessing.