{
  "measurement": "de-plattformen",
  "date": "2026-08-03",
  "question": "Eleven platforms a student at a German-speaking university actually cites — repositories, the national library, German publishers, case law, official statistics. Does the endpoint read them, and where it does not: is the page walled, unreachable, or just thin?",
  "method": {
    "endpoint": "https://provinglab.dev/mcp",
    "tool": "extract_citation",
    "sources": 11,
    "selection": "Fixed on 3 August 2026 before the run and not chosen for whether it works: four repositories (SSOAR as a known-walled control, PsychArchives, peDOCS, one OPUS 4 instance), the German National Library, two German-language publishers (Springer Link, Nomos), a licensed legal database (beck-online), free case law (openJur) and two official statistics bodies (Statistik Austria, Destatis). Every address answered 200 to a browser in the pre-check the same day.",
    "control": "Every handed-back source was fetched twice — once with the reader's own user agent, once with a browser's. A source counts as walled only when the browser is answered and the reader is not.",
    "network": "Commercial VPN exit on the local network, AS209854 Cyberzone S.A., Frankfurt DE — not a plain residential line",
    "counterpart": "docs/data/2026-08-03-de-plattformen.json"
  },
  "results": {
    "sources": 11,
    "complete_records": 5,
    "handed_back": 6,
    "handed_back_behind_a_wall": 1,
    "handed_back_page_unreachable": 0,
    "handed_back_thin_page": 5,
    "seconds_total": 7.6,
    "seconds_per_source": 0.69,
    "by_kind": {
      "repository": {
        "total": 4,
        "complete": 2
      },
      "catalogue": {
        "total": 1,
        "complete": 1
      },
      "publisher": {
        "total": 2,
        "complete": 2
      },
      "licensed db": {
        "total": 1,
        "complete": 0
      },
      "case law": {
        "total": 1,
        "complete": 0
      },
      "official statistics": {
        "total": 2,
        "complete": 0
      }
    }
  },
  "per_source": [
    {
      "kind": "repository",
      "platform": "SSOAR (Kontrolle)",
      "host": "www.ssoar.info",
      "url": "https://www.ssoar.info/ssoar/handle/document/71234",
      "complete": false,
      "seconds": 0.25,
      "warning": "The page looks like an error message or an access wall, not content. The details below are not usable as a reference.",
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "title"
      ],
      "as_reader": {
        "status": 200,
        "bytes": 34330
      },
      "as_browser": {
        "status": 200,
        "bytes": 24517
      }
    },
    {
      "kind": "repository",
      "platform": "PsychArchives (ZPID)",
      "host": "psycharchives.org",
      "url": "https://psycharchives.org/handle/20.500.12034/2487",
      "complete": true,
      "seconds": 0.6,
      "warning": null,
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "authors",
        "journal",
        "licence",
        "publisher",
        "title",
        "year"
      ]
    },
    {
      "kind": "repository",
      "platform": "peDOCS",
      "host": "www.pedocs.de",
      "url": "https://www.pedocs.de/frontdoor.php?source_opus=24629",
      "complete": true,
      "seconds": 0.55,
      "warning": null,
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "authors",
        "doi",
        "journal",
        "licence",
        "title",
        "year"
      ]
    },
    {
      "kind": "repository",
      "platform": "OPUS 4 (KOBV/ZIB)",
      "host": "opus4.kobv.de",
      "url": "https://opus4.kobv.de/opus4-zib/frontdoor/index/index/docId/8138",
      "complete": false,
      "seconds": 0.45,
      "warning": "The page looks like an error message or an access wall, not content. The details below are not usable as a reference.",
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "title"
      ],
      "as_reader": {
        "status": 404,
        "bytes": 0
      },
      "as_browser": {
        "status": 200,
        "bytes": 4732
      }
    },
    {
      "kind": "catalogue",
      "platform": "Deutsche Nationalbibliothek",
      "host": "d-nb.info",
      "url": "https://d-nb.info/1279437049",
      "complete": true,
      "seconds": 1.42,
      "warning": null,
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "authors",
        "publisher",
        "title",
        "year"
      ]
    },
    {
      "kind": "publisher",
      "platform": "Springer Link (Wirtschaftsdienst)",
      "host": "link.springer.com",
      "url": "https://link.springer.com/article/10.1007/s10273-022-3350-x",
      "complete": true,
      "seconds": 0.92,
      "warning": null,
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "authors",
        "doi",
        "journal",
        "licence",
        "publisher",
        "title",
        "year"
      ]
    },
    {
      "kind": "publisher",
      "platform": "Nomos eLibrary",
      "host": "www.nomos-elibrary.de",
      "url": "https://www.nomos-elibrary.de/10.5771/0506-7286-2024-1-5/europaeisches-verfassungsrecht-im-normativen-staatsnotstand",
      "complete": true,
      "seconds": 0.61,
      "warning": null,
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "doi",
        "journal",
        "publisher",
        "title",
        "year"
      ]
    },
    {
      "kind": "licensed db",
      "platform": "beck-online",
      "host": "beck-online.beck.de",
      "url": "https://beck-online.beck.de/Dokument?vpath=bibdata/zeits/zfr/2024/cont/zfr.2024.1.1.htm",
      "complete": false,
      "seconds": 1.07,
      "warning": "The page carries almost no content and declares no citation metadata. It is more likely an interstitial or a block page than the source itself.",
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "title"
      ],
      "as_reader": {
        "status": 200,
        "bytes": 2771
      },
      "as_browser": {
        "status": 200,
        "bytes": 2771
      }
    },
    {
      "kind": "case law",
      "platform": "openJur",
      "host": "openjur.de",
      "url": "https://openjur.de/u/2386045.html",
      "complete": false,
      "seconds": 0.54,
      "warning": "The only title the page declares is the name of the site or a bare record number, not the title of a work. Nothing here identifies a source.",
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "title"
      ],
      "as_reader": {
        "status": 200,
        "bytes": 3665
      },
      "as_browser": {
        "status": 200,
        "bytes": 3690
      }
    },
    {
      "kind": "official statistics",
      "platform": "Statistik Austria",
      "host": "www.statistik.at",
      "url": "https://www.statistik.at/statistiken/bevoelkerung-und-soziales/bevoelkerung/bevoelkerungsstand",
      "complete": false,
      "seconds": 0.37,
      "warning": "The page answered in full but declares no complete citation: a year is missing. Read this flag rather than the title field — the details below are what the page says about itself, not a reference.",
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "authors",
        "title"
      ],
      "as_reader": {
        "status": 200,
        "bytes": 93553
      },
      "as_browser": {
        "status": 200,
        "bytes": 93553
      }
    },
    {
      "kind": "official statistics",
      "platform": "Destatis",
      "host": "www.destatis.de",
      "url": "https://www.destatis.de/DE/Themen/Gesellschaft-Umwelt/Bevoelkerung/Bevoelkerungsstand/_inhalt.html",
      "complete": false,
      "seconds": 0.79,
      "warning": "The page answered in full but declares no complete citation: a year is missing. Read this flag rather than the title field — the details below are what the page says about itself, not a reference.",
      "has_ris": true,
      "has_bibtex": true,
      "fields": [
        "authors",
        "title"
      ],
      "as_reader": {
        "status": 200,
        "bytes": 161213
      },
      "as_browser": {
        "status": 200,
        "bytes": 161213
      }
    }
  ],
  "license": "CC-BY-4.0"
}