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    "story_id": "mp-2026-10-16-009",
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    "headline": "The Agent Organizes the Library Before the Question Arrives",
    "slug": "the-agent-organizes-the-library-before-the-question-arrives",
    "dek": "Librarian Agents train a builder to turn raw documents into reusable file hierarchies optimized for later answering.",
    "summary": "Librarian Agents train a builder to turn raw documents into reusable file hierarchies optimized for later answering.",
    "body_text": "Retrieval normally waits for a question, leaving cross-document organization to inference time. Librarian Agents instead have a builder model create a hierarchical workspace of synthetic files and reference links before future queries are known. Reinforcement learning rewards structures that improve a separate answering agent. The authors report a 33-point gain over their strongest retrieval and precomputation baselines on BrowseComp-Plus and a 31-point average zero-shot gain on BRIGHT, with upfront construction costs amortized over repeated queries. The benchmarks do not guarantee faithful curation in every domain, but they test an important shift from finding documents to designing a reusable information environment.",
    "why_it_matters": "Librarian Agents train a builder to turn raw documents into reusable file hierarchies optimized for later answering.",
    "limitations": [
      "The benchmarks do not guarantee faithful curation in every domain, but they test an important shift from finding documents to designing a reusable information environment."
    ],
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    "first_published_at": "2026-10-16T09:00:00.000-04:00",
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    "tags": [
      "long context",
      "retrieval",
      "agent workspaces"
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  "sources": [
    {
      "source_id": "source-2026-10-16-009",
      "title": "arXiv preprint 2610.22273, original v1",
      "publisher": "arXiv / submitting research authors",
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      "published_at": "2026-10-15T13:35:17.000-04:00",
      "accessed_at": "2026-10-16T08:26:36.400-04:00",
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    "description": "A daily newspaper for the age of artificial intelligence."
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    "title": "The Agent Organizes the Library Before the Question Arrives",
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