---
title: "Discussion on \"Building a RAG Engine — Part 4: Engine Controls\" | Hashnode"
description: "Discussion on \"Building a RAG Engine — Part 4: Engine Controls\". Adding graph retrieval, provider registry, cost tracking, eval gates, and domain-pack deployment controls before using a real corpus."
url: "https://hashnode.com/posts/building-a-rag-engine-part-4-engine-controls/6a34b84ad3eb0726e0d3789d"
---

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# [Building a RAG Engine — Part 4: Engine Controls](https://ebmurha.hashnode.dev/building-a-rag-engine-part-4-engine-controls?utm_source=hashnode&utm_medium=feed)

Adding graph retrieval, provider registry, cost tracking, eval gates, and domain-pack deployment controls before using a real corpus.

May 22 · 11 min read · ebmurha.hashnode.dev  
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-   [#rag](https://hashnode.com/tag/rag)
-   [#retrieval-augmented-generation](https://hashnode.com/tag/retrieval-augmented-generation)
-   [#graph-retrieval](https://hashnode.com/tag/graph-retrieval)
-   [#neo4j](https://hashnode.com/tag/neo4j)
-   [#eval-gates](https://hashnode.com/tag/eval-gates)
-   [#llm](https://hashnode.com/tag/llm)
-   [#llm-providers](https://hashnode.com/tag/llm-providers)
-   [#token-cost-tracking](https://hashnode.com/tag/token-cost-tracking)
-   [#evals](https://hashnode.com/tag/evals)
-   [#python](https://hashnode.com/tag/python)

## Written by

[Elisé Baraka M.](https://hashnode.com/@ebmurha)

@ebmurha

  
[View profile](https://hashnode.com/@ebmurha)

Enterprise systems consultant returning to engineering

I write applied AI, automation, enterprise systems, and operational design - with notes from building tools, testing ideas, and ongoing learning

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