{
  "$schema": "https://themachinepress.com/schemas/story-v1.schema.json",
  "schema_version": "1.0.0",
  "document_type": "machine_press_story",
  "story": {
    "story_id": "mp-2026-09-15-011",
    "source_story_id": "tmp-story-autotailor-compact-web-tools",
    "edition_id": "mp-2026-09-15-morning-0068",
    "edition_url": "https://themachinepress.com/edition/2026-09-15",
    "position": 11,
    "story_type": "dispatch",
    "section": "developer-tools",
    "editorial_classification": "editorial",
    "headline": "The Meta-Agent Cut 1,283 Browser Tools Down to 33",
    "slug": "the-meta-agent-cut-1-283-browser-tools-down-to-33",
    "dek": "AutoTailor’s final tool set reached 90.6% correctness with fallback while cutting request tokens 57.8% and latency 29.4%.",
    "summary": "AutoTailor’s final tool set reached 90.6% correctness with fallback while cutting request tokens 57.8% and latency 29.4%.",
    "body_text": "Tool-discovery systems can leave web agents with hundreds of redundant, badly sized APIs. AutoTailor converts successful trajectories into parameterized browser programs, filters them for granularity and likely use, then watches outcomes to add missing capabilities and prune unused ones. On 106 WebArena Postmill tasks, offline filtering reduced 1,283 candidate APIs to 87 and dynamic reselection produced 33. With ReAct fallback, the final set achieved 90.6% correctness versus 87.5% for ReAct alone while reducing request-token cost 57.8% and latency 29.4%.",
    "why_it_matters": "AutoTailor’s final tool set reached 90.6% correctness with fallback while cutting request tokens 57.8% and latency 29.4%.",
    "limitations": [],
    "importance": 8,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-15-011/the-meta-agent-cut-1-283-browser-tools-down-to-33",
    "json_url": "https://themachinepress.com/story/mp-2026-09-15-011.json",
    "first_published_at": "2026-09-15T09:00:00.000-04:00",
    "modified_at": "2026-09-15T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-09-15-011-001",
        "text": "AutoTailor’s final tool set reached 90.6% correctness with fallback while cutting request tokens 57.8% and latency 29.4%.",
        "source_ids": [
          "source-2026-09-15-011"
        ],
        "qualification": null
      }
    ],
    "source_ids": [
      "source-2026-09-15-011"
    ],
    "tags": [
      "web agents",
      "MCP",
      "tool selection"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-15-011",
      "title": "arXiv preprint 2609.13548",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.13548",
      "canonical_url": "https://arxiv.org/abs/2609.13548",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-13T20:00:00.000-04:00",
      "accessed_at": "2026-09-15T08:18:00.000-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-09-15-011-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "The Meta-Agent Cut 1,283 Browser Tools Down to 33",
    "publisher": "The Machine Press",
    "published_at": "2026-09-15T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-15-011/the-meta-agent-cut-1-283-browser-tools-down-to-33"
  }
}