rag_agent/
├── app.py                    # Main Gradio application entry point
├── config.py                 # Configuration hub (models, chunk sizes, providers)
├── util.py                   # PDF to markdown conversion
├── core/                     # Core RAG components orchestration
│   ├── chat_interface.py     
│   ├── document_manager.py   
│   └── rag_system.py         
├── knowledge_base/           # for create chromadb
├── chroma_data/              # chroma vectorstore data
├── agent_logic/                # LangGraph agent workflow
│   ├── edges.py              # Conditional routing logic
│   ├── graph.py              # Graph construction and compilation
│   ├── graph_state.py        # State definitions
│   ├── nodes.py              # Processing nodes (summarize, rewrite, agent)
│   ├── prompts.py            # System prompts
│   ├── schemas.py            # Pydantic data models
│   └── tools.py              # Retrieval tools
└── ui/                       # User interface
    └── gradio_app.py         # Gradio interface components