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    "story_id": "mp-2026-10-10-005",
    "source_story_id": "tmp-story-contextual-motion-safety-filter",
    "edition_id": "mp-2026-10-10-morning-0092",
    "edition_url": "https://themachinepress.com/edition/2026-10-10",
    "position": 5,
    "story_type": "dispatch",
    "section": "safety-security",
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    "headline": "The Same Motion Became Unsafe When a Person Entered the Scene",
    "slug": "the-same-motion-became-unsafe-when-a-person-entered-the-scene",
    "dek": "Contextual safety filtering grounds language rules in paired safe and unsafe trajectories without retraining the motion generator.",
    "summary": "Contextual safety filtering grounds language rules in paired safe and unsafe trajectories without retraining the motion generator.",
    "body_text": "A text-conditioned motion generator may produce the same movement near an object or near a person without understanding why the second context changes its risk. Contextual Safety Filtering turns active natural-language rules into safe and unsafe reference trajectories, then enforces an affine safety value through a control-barrier optimization layer. Across four pretrained generators, the filter activated the intended rule in every explicit and scene-triggered unsafe case, cut danger events by as much as 90%, and preserved 88% to 100% of benign motions. A Unitree G1 demonstration extended the test to real hardware. The findings remain limited to the tested rules and scenarios.",
    "why_it_matters": "Contextual safety filtering grounds language rules in paired safe and unsafe trajectories without retraining the motion generator.",
    "limitations": [
      "The findings remain limited to the tested rules and scenarios."
    ],
    "importance": 9,
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    "first_published_at": "2026-10-10T09:00:00.000-04:00",
    "modified_at": "2026-10-10T09:00:00.000-04:00",
    "content_status": "new",
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    "carryover_reason": null,
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        "text": "Contextual safety filtering grounds language rules in paired safe and unsafe trajectories without retraining the motion generator.",
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        "qualification": "The findings remain limited to the tested rules and scenarios."
      }
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    "source_ids": [
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    "tags": [
      "motion safety",
      "context grounding",
      "control barriers"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-10-10-005",
      "title": "arXiv preprint 2610.12467, original v1",
      "publisher": "arXiv / submitting research authors",
      "url": "https://arxiv.org/abs/2610.12467v1",
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      "published_at": "2026-10-08T13:59:50.000-04:00",
      "accessed_at": "2026-10-10T08:22:13.309-04:00",
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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": "The Same Motion Became Unsafe When a Person Entered the Scene",
    "publisher": "The Machine Press",
    "published_at": "2026-10-10T09:00:00.000-04:00",
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