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Agentic RAG Architecture: Self-Query, Plan-Execute-Replan, Tool-Augmented Retrieval, and the Validation Loop (2026)
agentic rag agentic ai rag architecture self-query plan-execute-replan tool-augmented retrieval validation loop faithfulness check sufficiency critic llm tool router multi-tool rag retrieval orchestration audit trace llm agent production rag ai architecture evergreen 2026