# Prof Dr med Ralf Kolvenbach: Agent-Direct Score F (15.4%)

Site: https://profkolvenbach.com/
Report: https://directindex.org/r/profkolvenbach.com
Scanned: 2026-10-20 (Provisional, with the action test and the assistant citation check still to come. The hatched part of the bar isn't measured yet.)
Prof Dr med Ralf Kolvenbach is largely invisible to agents.
AI assistants can't open Prof Dr med Ralf Kolvenbach's website, so they go by what other sites say about it.

## Direct links
- Book directly: https://www.doctolib.de/gefaesschirurgie/duesseldorf/ralf-kolvenbach-duesseldorf (through doctolib acting for the business)
- Phone: +4921128003525
- Address: Gräulinger Straße 120, 40625, Düsseldorf
- Languages: German, English
- WhatsApp: a link on the site

## Nearby, also direct
Places near Prof Dr med Ralf Kolvenbach that take a booking or an order on their own website, with no marketplace in between.
- K3 Wundzentrum Düsseldorf (160 m): https://directindex.org/r/k3-wundzentrum.de
- Privatpraxis fur Urologie (560 m): https://directindex.org/r/urologie-in-duesseldorf.de
- Hofmann Uta Prof. Dr. Dr (570 m): https://directindex.org/r/derma-hofmann.de

## What to fix first
- **The site turns away every visitor that isn't a browser, AI agents included.** (+25 points) A plain fetch was refused (challenge:checking your browser). Only a real browser got the page. Every AI crawler and agent gets turned away the same way, so Reachable scores 0 and the rest is measured on the page as the browser rendered it. Ask the host to let the AI user agents through. Guide: https://directindex.org/guides/blocking-ai-crawlers-without-knowing
- **No structured data for the business.** (+15 points) Add schema.org JSON-LD for the business (Dentist, MedicalClinic, Physiotherapy or the closest type, with name, address, telephone and openingHoursSpecification). Every assistant reads this block first, and the fix kit below has it filled in. Guide: https://directindex.org/guides/structured-data-restaurant
- **No list of services and prices found.** (+7 points) Agents answer 'what do they treat and what does it cost?' from directories instead. Add a page that lists services and prices as text, and link to it from the homepage. Guide: https://directindex.org/guides/menu-pdf-ai

## Fix kit: What to paste

Structured data (JSON-LD). Paste it as one block in the page's head, or in the builder's custom code box. Change anything that's wrong.

```html
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "LocalBusiness",
  "name": "Prof Dr med Ralf Kolvenbach",
  "url": "https://profkolvenbach.com/",
  "telephone": "+4921128003525",
  "address": "Gräulinger Straße 120, 40625, Düsseldorf",
  "geo": {
    "@type": "GeoCoordinates",
    "latitude": 51.243628,
    "longitude": 6.856967
  },
  "potentialAction": [
    {
      "@type": "ReserveAction",
      "target": {
        "@type": "EntryPoint",
        "urlTemplate": "https://www.doctolib.de/gefaesschirurgie/duesseldorf/ralf-kolvenbach-duesseldorf",
        "actionPlatform": [
          "http://schema.org/DesktopWebPlatform",
          "http://schema.org/MobileWebPlatform"
        ]
      },
      "result": {
        "@type": "Reservation",
        "name": "Reservation"
      }
    }
  ]
}
</script>
```

## Already right
- **robots.txt lets AI crawlers in.** There's no robots.txt, which means everything is allowed.
- **Appointments through doctolib on your own domain.** There's no marketplace commission, and the customer stays yours.

## Where it stands
1511 of 1628 in Düsseldorf dentists, clinics and vets. Top 93% of the sites scanned in this index.

| What the top 10% of the index does | Top 10% | This site |
|---|---|---|
| Take bookings or orders on their own domain | 96% | yes |
| Publish the menu or price list as HTML | 8% | no |
| Let AI crawlers in (no block at the server or in robots.txt) | 89% | no |
| Structured data with address, phone and hours | 16% | no |
| Have an llms.txt | 27% | no |

Nearest places in the index: Bag Prof. Dr. Med. Ralf Kolvenbach, Ossama Mohammad Und Kollegen-gefässmedizin (F, 69 m, https://directindex.org/r/medicum-gzd.de); K3 Wundzentrum Düsseldorf (C, 164 m, https://directindex.org/r/k3-wundzentrum.de); Prof. Dr Ulrich Raatz (F, 226 m, https://directindex.org/r/c-test.de); Praxis Für Physiotherapie Jürgen Bartels (F, 228 m, https://directindex.org/r/physiotherapie-schoen.de); TierÄrzteTeam Fidelios Dr. med. vet. Stefan Hofmann (D, 239 m, https://directindex.org/r/anicura.de); Tierheilpraxis Burgmann (F, 432 m, https://directindex.org/r/tierheilpraxis-burgmann.de); Privatpraxis fur Urologie (C, 561 m, https://directindex.org/r/urologie-in-duesseldorf.de); Hofmann Uta Prof. Dr. Dr (C, 565 m, https://directindex.org/r/derma-hofmann.de); Fege's Bone Factory (C, 694 m, https://directindex.org/r/physiogennen.de); Sielemann Zahnmedizin (D, 721 m, https://directindex.org/r/sielemann-zahnmedizin.de).

## What assistants answer
The assistants haven't been asked about this business yet. They're asked about the top-ranked businesses in each city index, and about any business as soon as it's claimed. Claim this page to be included.


Compared with its peers: Sites built with WordPress 58% (29% A or B, 108921 sites); Sites using Doctolib 55% (8% A or B, 2742 sites); This site 15.4%.

See what an AI agent reads on this site: https://directindex.org/r/profkolvenbach.com/agent-view

## Businesses like Prof Dr med Ralf Kolvenbach in Düsseldorf dentists, clinics and vets

| Group | Sites | Avg score | A or B | This site |
|---|---|---|---|---|
| Businesses of the same kind in Düsseldorf dentists, clinics and vets | 1628 | 46% | 9% | 15.4% |
| Sites built with WordPress in Düsseldorf dentists, clinics and vets | 688 | 55% | 17% | 15.4% |
| Sites using Doctolib in Düsseldorf dentists, clinics and vets | 219 | 56% | 9% | 15.4% |
| Sites built with WordPress and using Doctolib in Düsseldorf dentists, clinics and vets | 130 | 58% | 12% | 15.4% |

The best of the sites built with WordPress and using Doctolib in Düsseldorf dentists, clinics and vets: Dr. Med. Daniel Stosch (B 76.9%, https://directindex.org/r/orthopaedie-grunerstrasse.de); Institut Für Prävention Und Sportmedizin (B 76.9%, https://directindex.org/r/cardio-centrum.com); Kardiologische Gemeinschaftspraxis Kardiologen (B 76.9%, https://directindex.org/r/cardio-centrum.com); Preventicsone - Facharztzentrum Für Prävention, Kardiologie Und Sportmedizin (B 76.9%, https://directindex.org/r/preventics.one); DYADERM | DERMATOLOGIE & ÄSTHETIK DÜSSELDORF | DIMITRIOS GEORGAS (B 75.4%, https://directindex.org/r/dyaderm.de).

With the three fixes above (The site turns away every visitor that isn't a browser, AI agents included; No structured data for the business; No list of services and prices found), the score would be about 87.7%. That would be 3rd of 1,628 in Düsseldorf dentists, clinics and vets, up from 1511th.

## The direct record
What agents get for Prof Dr med Ralf Kolvenbach, as JSON: https://directindex.org/api/direct/profkolvenbach.com
- Book: https://www.doctolib.de/gefaesschirurgie/duesseldorf/ralf-kolvenbach-duesseldorf (vendor on own site: Doctolib; found by the scan of 2026-10-20, not yet tested)
- Order: none on record
- Menu: none on record
- Hours: none on record
- Phone: +4921128003525
- Stable links that count: https://directindex.org/go/profkolvenbach.com/book

## Can an agent transact?
Measured, not scored (the score stays at spec v1.0).
- UCP profile (/.well-known/ucp, Google and Shopify's Universal Commerce Protocol): no
- ACP discovery document (/.well-known/acp.json, OpenAI and Stripe's Agentic Commerce Protocol): no
- MCP server card (/.well-known/mcp/server-card.json): no
- Ordering vendor that takes agent orders (Square, Toast, or a vendor whose terms allow agents): no
- Vendor terms for agents, Doctolib: Not stated. Doctolib's patient terms (April 2026), article 19, forbid web scraping and make automated data harvesting subject to Doctolib's prior consent; they do not address an agent booking an appointment for a patient, and no API or partner path for agents is documented. Read 2026-10-15: https://media.doctolib.com/image/upload/v1776929137/legal/B2C_T_Cs.pdf

Only a real browser got this page (a plain fetch got challenge:checking your browser); Readable and Actionable were measured on the rendered page.

## Score breakdown
| Component | Points | Available |
|---|---|---|
| Reachable | 0 | 25 |
| Readable | 0 | 25 |
| Actionable | 10 | 15 (the action test: pending) |
| Cited | 0 | 0 (the assistant citation check: pending) |

## Agent readiness (Cloudflare)
Not measured for this scan.
- JSON-LD for the business: no

Keep watching this business (https://directindex.org/r/profkolvenbach.com/plan): the assistants are asked again every month, and you see what changed. 2 EUR a month or 19 EUR a year.
Deep report: https://directindex.org/r/profkolvenbach.com/deep. Ten questions phrased the way people ask them, each assistant's full answer, the eight nearest similar places, the fix plan and a PDF. 5 EUR, paid once. Reading and scanning stay free. These few euros pay for the questions sent to the assistants and for the servers.
Methodology: https://directindex.org/methodology · Rescan now: https://directindex.org/scan?url=profkolvenbach.com&force=1