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  "story": {
    "story_id": "mp-2026-09-25-002",
    "source_story_id": "tmp-feature-agent-simulation-screening",
    "edition_id": "mp-2026-09-25-morning-0078",
    "edition_url": "https://themachinepress.com/edition/2026-09-25",
    "position": 2,
    "story_type": "secondary",
    "section": "business-enterprise",
    "editorial_classification": "editorial",
    "headline": "Simulated Customers Screened an AI Agent Before Launch",
    "slug": "simulated-customers-screened-an-ai-agent-before-launch",
    "dek": "Nubank reports a 36.69-point tNPS gain in one live test and an 8.82-point self-service gain in another.",
    "summary": "Nubank reports a 36.69-point tNPS gain in one live test and an 8.82-point self-service gain in another.",
    "body_text": "A team used synthetic customers and simulated tool responses to rehearse customer-service agents without touching production backends. Across four deployed versions of Nubank's card-support agents, version-level simulator scores tracked production evaluator scores. Simulation-guided iteration preceded a live A/B test that raised transactional net promoter score by 36.69 points; a separate screen of more than 16,000 simulated conversations selected an open-weight configuration that increased self-service by 8.82 percentage points without a statistically significant tNPS change. These are company-specific results reported by the authors, not proof that simulated testing predicts every production environment.",
    "why_it_matters": "Nubank reports a 36.69-point tNPS gain in one live test and an 8.82-point self-service gain in another.",
    "limitations": [
      "These are company-specific results reported by the authors, not proof that simulated testing predicts every production environment."
    ],
    "importance": 10,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-25-002/simulated-customers-screened-an-ai-agent-before-launch",
    "json_url": "https://themachinepress.com/story/mp-2026-09-25-002.json",
    "first_published_at": "2026-09-25T09:00:00.000-04:00",
    "modified_at": "2026-09-25T09:00:00.000-04:00",
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      {
        "claim_id": "claim-mp-2026-09-25-002-001",
        "text": "Nubank reports a 36.69-point tNPS gain in one live test and an 8.82-point self-service gain in another.",
        "source_ids": [
          "source-2026-09-25-002"
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        "qualification": "These are company-specific results reported by the authors, not proof that simulated testing predicts every production environment."
      }
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    "source_ids": [
      "source-2026-09-25-002"
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    "tags": [
      "customer-service agents",
      "simulation",
      "production evaluation"
    ],
    "image_url": "https://themachinepress.com/issues/2026-09-25/feature-agent-simulation-screening.png",
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-09-25-002",
      "title": "arXiv preprint 2609.30137",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.30137",
      "canonical_url": "https://arxiv.org/abs/2609.30137",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-24T13:07:38.000-04:00",
      "accessed_at": "2026-09-25T08:29:03.434-04:00",
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  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "Simulated Customers Screened an AI Agent Before Launch",
    "publisher": "The Machine Press",
    "published_at": "2026-09-25T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-25-002/simulated-customers-screened-an-ai-agent-before-launch"
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