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  "story": {
    "story_id": "mp-2026-09-27-003",
    "source_story_id": "tmp-story-agent-reasoning-context-compression",
    "edition_id": "mp-2026-09-27-morning-0080",
    "edition_url": "https://themachinepress.com/edition/2026-09-27",
    "position": 3,
    "story_type": "dispatch",
    "section": "benchmarks-evals",
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    "headline": "An Agent Forgot Its Reasoning After the State Was Saved",
    "slug": "an-agent-forgot-its-reasoning-after-the-state-was-saved",
    "dek": "A training-free compressor cut input, output and cache tokens while raising reported reward on WorkBuddyBench.",
    "summary": "A training-free compressor cut input, output and cache tokens while raising reported reward on WorkBuddyBench.",
    "body_text": "The ICLR method ranks completed reasoning blocks by whether they still matter after an agent has externalized useful state into files, tools or the environment. On 260 WorkBuddyBench tasks, the authors report reward rising from 0.699 to 0.718 while input, output and cache tokens fell by 25.5%, 14.4% and 33.3%, respectively. The study argues that internal reasoning can become replaceable once its consequences are safely recorded, though the result is benchmark-specific and does not license deleting audit evidence.",
    "why_it_matters": "A training-free compressor cut input, output and cache tokens while raising reported reward on WorkBuddyBench.",
    "limitations": [
      "The study argues that internal reasoning can become replaceable once its consequences are safely recorded, though the result is benchmark-specific and does not license deleting audit evidence."
    ],
    "importance": 9,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-27-003/an-agent-forgot-its-reasoning-after-the-state-was-saved",
    "json_url": "https://themachinepress.com/story/mp-2026-09-27-003.json",
    "first_published_at": "2026-09-27T09:00:00.000-04:00",
    "modified_at": "2026-09-27T09:00:00.000-04:00",
    "content_status": "new",
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    "carryover_reason": null,
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        "text": "A training-free compressor cut input, output and cache tokens while raising reported reward on WorkBuddyBench.",
        "source_ids": [
          "source-2026-09-27-003"
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        "qualification": "The study argues that internal reasoning can become replaceable once its consequences are safely recorded, though the result is benchmark-specific and does not license deleting audit evidence."
      }
    ],
    "source_ids": [
      "source-2026-09-27-003"
    ],
    "tags": [
      "agent memory",
      "context compression",
      "tool use"
    ],
    "image_url": "https://themachinepress.com/issues/2026-09-27/agent-context-compression-brain.webp",
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-27-003",
      "title": "arXiv preprint 2609.29875",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.29875",
      "canonical_url": "https://arxiv.org/abs/2609.29875",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-24T10:28:43.000-04:00",
      "accessed_at": "2026-09-27T08:26:41.000-04:00",
      "supports_claim_ids": [
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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": "An Agent Forgot Its Reasoning After the State Was Saved",
    "publisher": "The Machine Press",
    "published_at": "2026-09-27T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-27-003/an-agent-forgot-its-reasoning-after-the-state-was-saved"
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