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    "story_id": "mp-2026-08-30-027",
    "source_story_id": "tmp-story-verdict-staleness-front-rail",
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    "position": 16,
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    "section": "safety-security",
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    "headline": "Approval Expired Before the Action",
    "slug": "approval-expired-before-the-action",
    "dek": "A guardrail verdict can be correct when checked and unsafe by the time a self-adaptive system acts.",
    "summary": "A guardrail verdict can be correct when checked and unsafe by the time a self-adaptive system acts.",
    "body_text": "Across five reproducible environments, fixed-action replay produced verdict-change rates from 5.3 to 48.4 percent after eight simulator steps. The proposed Freshness-Bounded Shield estimates an approval horizon from safety margin and recent feature volatility; under fixed settings, the authors report reducing oracle-labeled expiry from a 3.4-to-24.7-percent range to zero-to-1.8 percent. Four language-model judges still showed nonzero use-time invalidity, motivating a check-time-and-use-time freshness contract.",
    "why_it_matters": "A guardrail verdict can be correct when checked and unsafe by the time a self-adaptive system acts.",
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    "first_published_at": "2026-08-30T09:00:00.000-04:00",
    "modified_at": "2026-08-30T09:00:00.000-04:00",
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    "tags": [
      "guardrails",
      "TOCTOU",
      "self-adaptive systems"
    ],
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    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-08-30-016",
      "title": "arXiv preprint 2608.26306",
      "publisher": "arXiv",
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      "published_at": "2026-08-26T14:39:10.000-04:00",
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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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    "title": "Approval Expired Before the Action",
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