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    "story_id": "mp-2026-08-05-015",
    "source_story_id": "tmp-sidebar-memarena-permission-aware-memory",
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    "section": "safety-security",
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    "headline": "Every Memory Backend Mishandled Permission",
    "slug": "every-memory-backend-mishandled-permission",
    "dek": "An on-device assistant benchmark found systems either leaked too much or disclosed too little.",
    "summary": "An on-device assistant benchmark found systems either leaked too much or disclosed too little.",
    "body_text": "MemArena simulates 50 agents over 15 days and tests five open-weight readers with several memory backends. The authors report that backend choice affected accuracy more than reader scaling, while permission-aware access failed universally: oracle retrieval leaked heavily and other systems were overly reluctant. Results come from a synthetic single-world benchmark, not real private conversations.",
    "why_it_matters": "An on-device assistant benchmark found systems either leaked too much or disclosed too little.",
    "limitations": [
      "Results come from a synthetic single-world benchmark, not real private conversations."
    ],
    "importance": 7,
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    "first_published_at": "2026-08-05T09:00:00.000-04:00",
    "modified_at": "2026-08-05T09:00:00.000-04:00",
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        "text": "An on-device assistant benchmark found systems either leaked too much or disclosed too little.",
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        "qualification": "Results come from a synthetic single-world benchmark, not real private conversations."
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    "source_ids": [
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    "tags": [
      "memory",
      "privacy",
      "on-device AI"
    ],
    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-08-05-017",
      "title": "arXiv preprint 2608.02609",
      "publisher": "arXiv",
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  "publisher": {
    "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": "Every Memory Backend Mishandled Permission",
    "publisher": "The Machine Press",
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