{
  "user_prompt": "RAG (Retrieval-Augmented Generation) system architecture diagram for academic journal paper. Clean left-to-right flow with these components in order:\n\nLEFT SECTION - INGESTION PIPELINE:\n1. 'Documents' icon/stack (PDFs, text files) on the far left\n2. Arrow labeled 'Chunking' pointing right to 'Text Chunks' box\n3. Arrow labeled 'Embedding' pointing right to an 'Embedding Model' box\n4. Arrow pointing down to 'Vector Store' (cylinder/database shape)\n\nCENTER SECTION - RETRIEVAL:\n5. 'User Query' box at top center with arrow labeled 'Query Embedding' going down to 'Embedding Model'\n6. Arrow from embedded query to 'Vector Store' labeled 'Similarity Search'\n7. Arrow from Vector Store up to 'Candidate Chunks (top-k)' box\n8. Arrow right to 'Reranker' box labeled 'Cross-encoder scoring'\n9. Arrow from Reranker to 'Reranked Context' box labeled 'Filtered top-n'\n\nRIGHT SECTION - GENERATION:\n10. Arrow from 'Reranked Context' right to 'LLM' (large box)\n11. Arrow from User Query also connecting to LLM labeled 'Original query'\n12. Arrow from LLM right to 'Generated Response' box\n\nFEEDBACK LOOP (dashed):\n13. Dashed arrow from 'Generated Response' curving back underneath the entire pipeline to 'Vector Store' and 'Reranker', labeled 'User Feedback / Relevance Signal'\n\nSTYLE:\n- Muted professional colors: soft blue for ingestion, teal for retrieval, warm orange for generation, gray for feedback\n- Rounded rectangles for processing steps, cylinder for vector store\n- All arrows clearly labeled with data flow descriptions\n- White background, sans-serif fonts\n- IEEE/Nature journal publication quality\n- Clean, uncluttered layout with adequate spacing\n- Each major section (Ingestion, Retrieval, Generation) subtly grouped",
  "doc_type": "journal",
  "quality_threshold": 8.5,
  "iterations": [
    {
      "iteration": 1,
      "image_path": "figures/rag_architecture_v1.png",
      "score": 0,
      "needs_improvement": true,
      "critique": "Generation failed: 400 Client Error: Bad Request for url: https://openrouter.ai/api/v1/chat/completions",
      "error": true
    },
    {
      "iteration": 2,
      "image_path": "figures/rag_architecture_v2.png",
      "score": 0,
      "needs_improvement": true,
      "critique": "Generation failed: 400 Client Error: Bad Request for url: https://openrouter.ai/api/v1/chat/completions",
      "error": true
    }
  ],
  "final_score": 0,
  "final_image": null,
  "early_stop": false,
  "early_stop_reason": null
}