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ProblemMap/GlobalFixMap/RAG/index_skew.md
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# Index Skew — Guardrails and Fix Pattern
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **RAG**.
> To reorient, go back here:
>
> - [**RAG** — retrieval-augmented generation and knowledge grounding](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
>
> Think of this page as a desk within a ward.
> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
</details>
When the index reports "healthy" (no errors, embeddings ingested, stats normal) but **retrieval still fails**:
coverage is low, ΔS unstable, or retrieved snippets are inconsistent with ground truth.
This indicates an **index skew** between data reality and retrieval semantics.