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    "story_id": "mp-2026-08-07-003",
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    "headline": "The First Error Was Not Always the Fatal One",
    "slug": "the-first-error-was-not-always-the-fatal-one",
    "dek": "TrajDebug follows mistakes through long agent runs to distinguish resolved detours from failures that still reach the terminal state.",
    "summary": "TrajDebug follows mistakes through long agent runs to distinguish resolved detours from failures that still reach the terminal state.",
    "body_text": "TrajDebug compresses long histories, identifies evidence for local errors and tracks whether each error was resolved or remained responsible for a failed outcome. Its companion TrajErrBench contains 486 manually annotated failed trajectories from Tau2Bench and SWE-Bench Pro. The authors report stronger critical-error detection than their baselines and actionable downstream diagnoses; the preprint does not establish perfect attribution in production agents.",
    "why_it_matters": "TrajDebug follows mistakes through long agent runs to distinguish resolved detours from failures that still reach the terminal state.",
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      "The authors report stronger critical-error detection than their baselines and actionable downstream diagnoses; the preprint does not establish perfect attribution in production agents."
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    "first_published_at": "2026-08-07T09:00:00.000-04:00",
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        "text": "TrajDebug follows mistakes through long agent runs to distinguish resolved detours from failures that still reach the terminal state.",
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    "tags": [
      "AI agents",
      "debugging",
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      "source_id": "source-2026-08-07-003",
      "title": "arXiv preprint 2608.06346",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2608.06346",
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    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "The First Error Was Not Always the Fatal One",
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    "published_at": "2026-08-07T09:00:00.000-04:00",
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