When More Documents Hurt RAG: Mitigating Vector Search Dilution with Domain-Scoped, Model-Agnostic Retrieval

In three linesRAG degrades on heterogeneous collections: dense search loses discriminative power (Wyoming DOT: 75% → 40% scaling 54 to 1,128 docs). MASDR-RAG proposes domain scoping via organizational metadata, improving P@10 from 0.77 to 0.86 (p<0.05). Multi-agent orchestration creates precision-faithfulness paradox.

Summary generated by Claude — human-verified