AI Agent RAG System Architecture

Retrieval-Augmented Generation with Intelligent Agent Orchestration

HTTPS REST/gRPC similarity context events Response vectors User Browser/App Chat UI React/Vue API Gateway Kong/Nginx Auth Service JWT/OAuth2 Kafka / Redis Agent Controller Orchestrator LangChain/ReAct Query Processor Embedding + Cache Query Rewrite Retrieval Vector Search Hybrid Retrieval Rank Vector DB Pinecone/Milvus Weaviate/Qdrant ANN Index Knowledge Base Documents Web Pages Markdown/TXT/PDF Cache Redis/Memcached Session Store TTL: 1h-24h Embedding Model text-embedding-3 BERT/Sentence-BERT 1536 dims Large Language Model GPT-4o / Claude 3.5 / Gemini Llama 3.1 / Qwen 2.5 API / Self-hosted Ingestion Pipeline PDF/TXT Web Scraping API Sources Database Legend Frontend Backend Service Database/Vector Cloud/Infra Security Message Bus External/AI Data Flow Auth Flow Region Boundary

RAG Pipeline

  • • Query Understanding & Rewrite
  • • Hybrid Search (Dense + Sparse)
  • • Semantic Similarity Matching
  • • Cross-encoder Reranking
  • • Context Window Management

Agent Capabilities

  • • ReAct / Reasoning Loop
  • • Tool Use & Function Calling
  • • Memory & Session Management
  • • Multi-turn Conversation
  • • Task Decomposition

Data Sources

  • • Structured Documents (PDF/TXT)
  • • Web Pages & Articles
  • • Internal APIs & Databases
  • • Knowledge Graphs
  • • Real-time Data Streams

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