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# Dimension Mismatch and Projection — Guardrails and Fix Patterns
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **Embeddings**.
> To reorient, go back here:
>
> - [**Embeddings** — vector representations and semantic search](./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>
Use this page when vectors fail at write or retrieval due to mismatched dimensions or when a projection adapter silently degrades meaning. The goal is to align model output size, store configuration, and any projection layer, then verify with ΔS, coverage, and λ.
## Open these first