Architecture note · RAG system architecture

RAG as a Retrieval Boundary: Context Selection Before Generation

A systems note on how retrieval-augmented generation separates evidence selection from language generation.

By AbdullahPublished 24 Aug 2026Updated 24 Aug 2026
Answer in one sentence

RAG is easiest to reason about when retrieval is treated as a separate evidence-selection step with its own quality contract.

Query construction

Clarify what evidence is actually needed before selecting embeddings, rewriting, filtering, or metadata constraints.

Candidate selection

Retrieve candidates with explicit freshness, access, latency, and relevance expectations.

Grounded generation

Pass relevant and appropriately formatted context to the generator. More context is not automatically better context.

Evaluation boundary

Test retrieval and generation separately where possible because a wrong answer may originate in missing evidence, poor ranking, or generation behavior.

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About the author

AI Developer / ML Engineer building end-to-end AI systems from research to production, with a focus on multimodal AI, LLM applications, retrieval, MLOps, and systems engineering. He is based in Rawalpindi, Pakistan and is the founder of GROVE SYSTEMS.

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