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    "story_id": "mp-2026-10-08-005",
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    "section": "robotics",
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    "headline": "A Drawn Line Steered Three Robot Policies",
    "slug": "a-drawn-line-steered-three-robot-policies",
    "dek": "Sparse traces, target points and directions altered actions in noise space without changing the base policy architecture.",
    "summary": "Sparse traces, target points and directions altered actions in noise space without changing the base policy architecture.",
    "body_text": "RoboPrompt translates intuitive human guidance into an action draft, then lets the base diffusion or flow-matching policy refine that draft through its normal generation dynamics. The reusable steering module worked across Diffusion Policy, pi-0.5 and FastWAM without policy-specific architectural changes or steerability fine-tuning. The researchers then used corrected rollouts for DAgger-style improvement. After two or three rounds, average success increased 15.5% for pi-0.5 across three tasks and 21.3% across three policies on an Insert Bread task, while intervention counts fell by 44.0% and 81.9% in the respective comparisons. The tested settings are limited, but the interface makes occasional human intent a lightweight input rather than a full teleoperation session.",
    "why_it_matters": "Sparse traces, target points and directions altered actions in noise space without changing the base policy architecture.",
    "limitations": [],
    "importance": 8,
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    "first_published_at": "2026-10-08T09:00:00.000-04:00",
    "modified_at": "2026-10-08T09:00:00.000-04:00",
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    "tags": [
      "shared autonomy",
      "robot policy",
      "human guidance"
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    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-10-08-005",
      "title": "arXiv preprint 2610.10534",
      "publisher": "arXiv",
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      "published_at": "2026-10-07T13:58:53.000-04:00",
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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": "A Drawn Line Steered Three Robot Policies",
    "publisher": "The Machine Press",
    "published_at": "2026-10-08T09:00:00.000-04:00",
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