{
  "caseId": "chat-l0-domain-hint",
  "query": "Should L0 keyword matching decide the final retrieval result?",
  "retrievedAt": "2026-07-06T00:00:00Z",
  "lookupResult": {
    "found": true,
    "evidenceBlocks": [
      {
        "source": "rag-l0-domain-entity-hint",
        "title": "RAG L0 Domain Entity Hint",
        "breadcrumb": "RAG > L0 > Domain Entity Hint",
        "retrievalLayer": "L1",
        "content": "L0 should be retained as a domain detector, entity extractor, metadata filter generator, and explainability signal, not as the final retrieval decision.",
        "score": 0.88,
        "hitReasons": ["domain_match:+0.15", "keyword_match:+0.10"]
      },
      {
        "source": "rag-l0-l1-fusion-ranking",
        "title": "RAG L0 L1 Fusion Ranking",
        "breadcrumb": "RAG > Ranking > Fusion",
        "retrievalLayer": "L1",
        "content": "L0 and L1 candidates should eventually be fused rather than handled as an early-return branch.",
        "score": 0.75,
        "hitReasons": ["domain_match:+0.15"]
      }
    ],
    "contextPack": {
      "packedText": "[1] RAG L0 Domain Entity Hint\nRAG > L0 > Domain Entity Hint\nL0 should be retained as a domain detector, entity extractor, metadata filter generator, and explainability signal, not as the final retrieval decision.",
      "strategy": "top_evidence_blocks",
      "charBudget": 3500,
      "usedChars": 219,
      "includedSources": ["rag-l0-domain-entity-hint", "rag-l0-l1-fusion-ranking"],
      "omittedSources": []
    },
    "retrievalTrace": {
      "originalQuery": "Should L0 keyword matching decide the final retrieval result?",
      "rewrittenQuery": "RAG L0 keyword matching domain entity hint final retrieval decision",
      "categoryFilter": "RAG",
      "selectedAttempt": "FILTERED_VECTOR",
      "fallbackReason": null,
      "evidenceStatus": "supported",
      "queryHints": {
        "domains": ["RAG"],
        "matched_keywords": ["domain detector", "entity extractor", "metadata filter"],
        "entities": ["L0"],
        "l0_titles": ["RAG L0 Domain Entity Hint"],
        "l0_match_count": 1
      },
      "attempts": [
        {
          "name": "FILTERED_VECTOR",
          "query": "RAG L0 keyword matching domain entity hint final retrieval decision",
          "categoryFilter": "RAG",
          "candidateCount": 2,
          "usable": true,
          "durationMs": 9,
          "topScore": 0.88,
          "topSimilarity": 0.88
        }
      ]
    },
    "rerankTrace": {
      "items": [
        {
          "finalRank": 1,
          "source": "rag-l0-domain-entity-hint",
          "baseScore": 0.88,
          "finalScore": 1.13,
          "boostReasons": ["domain_match:+0.15", "keyword_match:+0.10"]
        },
        {
          "finalRank": 2,
          "source": "rag-l0-l1-fusion-ranking",
          "baseScore": 0.75,
          "finalScore": 0.9,
          "boostReasons": ["domain_match:+0.15"]
        }
      ]
    }
  }
}