RAG Architecture: Components, Patterns & Best Practices

Retrieval-Augmented Generation (RAG) connects large language models with external enterprise knowledge sources to provide more current, grounded, and auditable responses without retraining model weights. Production systems typically include ingestion processes for parsing, chunking, embedding, and tagging data; retrieval processes using vector, keyword, hybrid search, and reranking; and generation processes that construct prompts, produce answers, cite sources, and validate outputs. The discussion recommends selecting vector databases according to scale and operational needs, using structure-aware chunking and metadata filtering, and continuously evaluating context relevance, groundedness, and answer relevance. It also emphasizes enterprise controls such as document-level permissions, credential management, audit logging, PII protection, prompt-injection defenses, and compliance processes. Deployment choices between managed and custom platforms depend on integration, security, scale, and customization requirements, while cost can be managed through caching, tiered retrieval, context reduction, and usage monitoring. Emerging approaches include GraphRAG for relationship-based questions, agentic RAG for iterative reasoning, and multimodal or real-time retrieval, with MintMCP presented as a governance platform for managing MCP-based data connections, access policies, monitoring, and security controls across AI clients.

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