{
  "slug": "static-rag-misses-agentic-utility-715253",
  "title": "Static RAG Misses Agentic Utility",
  "dek": "A HotpotQA/ReAct counterfactual study finds that static RAG utility barely tracks which documents causally help a multi-step search agent.",
  "summary": "HotpotQA/ReAct counterfactuals show CTU and SRU are nearly independent, revealing bridge documents that help agents search.",
  "tags": [
    "agentic-retrieval",
    "rag-evaluation",
    "counterfactual-evaluation",
    "ctu",
    "sru",
    "hotpotqa",
    "react-agent",
    "bridge-documents"
  ],
  "published_at": "2026-07-18T16:06:41.746+00:00",
  "grade": 8.8,
  "agent_utility": 9.2,
  "price_usdc": 0.264,
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  "preview": {
    "faq_questions": [
      "What is a bridge document?",
      "How is Counterfactual Trajectory Utility measured?",
      "Does Static RAG Utility predict CTU?",
      "How common were bridge documents?",
      "Why do bridge documents help the agent?",
      "Does this prove the result generalizes to all agentic retrieval?"
    ],
    "entity_names": [
      {
        "name": "Counterfactual Trajectory Utility",
        "type": "metric"
      },
      {
        "name": "CTU",
        "type": "metric_abbreviation"
      },
      {
        "name": "Static RAG Utility",
        "type": "metric"
      },
      {
        "name": "SRU",
        "type": "metric_abbreviation"
      },
      {
        "name": "bridge documents",
        "type": "concept"
      },
      {
        "name": "ReAct style agent",
        "type": "agent_setup"
      },
      {
        "name": "HotpotQA",
        "type": "benchmark"
      },
      {
        "name": "Observable Entity Relevance",
        "type": "measure"
      },
      {
        "name": "OER",
        "type": "measure_abbreviation"
      },
      {
        "name": "BM25",
        "type": "retrieval_proxy"
      },
      {
        "name": "cross encoder",
        "type": "relevance_proxy"
      },
      {
        "name": "Spearman rho",
        "type": "statistic"
      },
      {
        "name": "language model search agent",
        "type": "system"
      }
    ],
    "related_work_titles": [
      "Static reader-based RAG evaluation",
      "ReAct-style search agents",
      "HotpotQA development-question replay",
      "BM25 and cross-encoder static proxies",
      "Observable Entity Relevance prior measure"
    ],
    "application_industries": [
      "Retrieval evaluation",
      "Agentic RAG systems",
      "Search-agent debugging",
      "Query generation analysis",
      "Benchmark research"
    ],
    "glossary_terms": [
      "Agentic retrieval",
      "Bridge document",
      "Counterfactual Trajectory Utility",
      "Static RAG Utility",
      "Document deletion",
      "Observable Entity Relevance",
      "Discriminative entity",
      "BM25",
      "Cross encoder",
      "Spearman rho",
      "Trajectory deltas"
    ]
  },
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