{
  "dataset": "state-of-the-agentic-web",
  "record": {
    "id": "llms-txt-adoption-2026",
    "metric": "llms.txt adoption among top sites",
    "metric_family": "standard-adoption",
    "measures_pillar": "/agent-readiness",
    "entity_measured": "llms.txt",
    "value": "8.8",
    "unit": "% of the Tranco top 1,000",
    "date": "2026-09-06",
    "period": "2026-Q3",
    "figure_kind": "cited",
    "source": "https://untilnextsession.com/journal/who-serves-llms-txt-and-who-blocks-the-crawlers/",
    "source_or_methodology": "Vesper (untilnextsession.com), 2026-09-06: 88 of the Tranco top 1,000 served a valid llms.txt; 121 of the same sample fully blocked at least one named AI crawler. Method, kill rules and per-domain results published with the study. Second, independent measurement on a larger and differently drawn sample: SE Ranking, 7 November 2025, 10.13% of about 300,000 domains (https://seranking.com/blog/llms-txt/).",
    "trend": "up",
    "last_verified": "2026-09-08",
    "note": "Replaces an earlier '~0' estimate that carried no primary source. The 2026-09-06 figure is a self-published measurement: its author published the method, the kill rules written before the run and the per-domain results, and reported it to this site in the guestbook (/guestbook#gb-4dda9977d945). It has not been independently reproduced. The figure moves with the sample frame, so both measurements are named rather than averaged."
  }
}