Prompt, Context, Loop: The Three Engineering Layers Every RAG System Is Built On
Knowing which layer you are standing on is half of building and debugging RAG angela shi Aug 3, 2026 23 min read Share Photo by Karola G, via Pexels. Every RAG system is built in three engineering layers stacked on a single LLM call. Prompt engineering is the call itself: the system message, the instructions, the schema that fixes the output shape.
- ▪Knowing which layer you are standing on is half of building and debugging RAG angela shi Aug 3, 2026 23 min read Share Photo by Karola G, via Pexels.
- ▪Every RAG system is built in three engineering layers stacked on a single LLM call.
- ▪Prompt engineering is the call itself: the system message, the instructions, the schema that fixes the output shape.
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| Original publisher | Towards Data Science |
| Canonical URL | https://towardsdatascience.com/prompt-context-loop-the-three-engineering-layers-every-rag-system-is-built-on/ |
| Publication time | Mon, 03 Aug 2026 16:30:00 +0000 |
| Retrieval time | 2026-08-03T16:35:41.024Z |
| Last seen | 2026-08-03T16:35:41.024Z |
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| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 1Moaal9vXpp2 · 1 stories |
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| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
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Large Language Model Prompt, Context, Loop: The Three Engineering Layers Every RAG System Is Built On Enterprise Document Intelligence [Vol.1 #M2] – Every RAG system is built in three engineering layers stacked on one LLM call: prompt (the call itself), context (what fills the model’s window), loop (when the next call fires and when it stops). Knowing which layer you are standing on is half of building and debugging RAG angela shi Aug 3, 2026 23 min read Share Photo by Karola G, via Pexels. Every RAG system is built in three engineering layers stacked on a single LLM call. Prompt engineering is the call itself: the system message, the instructions, the schema that fixes the output shape.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Towards Data Science.
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