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The Index › Retail › ebay.com
F

eBayebay.com

27/ 100 · Agentic Usability Score
WalledScanned 2026-09-22 · local-node · method v0.1Edge: AkamaiGHost
Muse
Meta
?Untested
ChatGPT Agent
OpenAI
▮Walled
Claude
Anthropic
▮Walled
Comet
Perplexity
▮Walled
Grok Bot
xAI
◌Not disallowed
Gemini
Google
▮Walled
Manus
Manus
◌Not disallowed
Instinct
Spear Street
?Untested

Score breakdown

Five pillars. Task completion is pending until the live task runner ships; the other four are rescaled to 100.
Accessrobots.txt stance + live door test
21/40
Consent & identity pathContent-Signal, published agent policy
0/10
Machine-readable surfacellms.txt, JSON-LD, landmarks, SSR
3/25
Agent protocolsUCP, MCP, A2A, OpenAPI
0/15
Task completionlive agent run: search → cart → checkout
pending

Evidence

Generated by the scanner from this run. Every line is reproducible with the open-source probe.
  • ✕Homepage returns a bot interstitial (HTTP 403, “Error Page | eBay”) to every non-browser client, agents included
  • ✓robots.txt has no rule against any user-directed agent we test
  • ◐robots.txt restricts some paths for ChatGPT-User, Claude-User
  • ◐Also disallows 11 of 15 training/search crawlers (not scored; agents ≠ crawlers)
  • ◐No Content-Signal in robots.txt
  • ◐No llms.txt
  • ◐No agent-protocol manifest (UCP, MCP, A2A, OpenAPI)
Identified asHTTPResult
ChatGPT-User—no response
Claude-User—no response
Perplexity-User—no response
GoogleAgent-Mariner403blocked · “Error Page | eBay”
browser (human)403interstitial · “Error Page | eBay”

What eBay would need to change

1Verify agents cryptographically instead of blocking them at the doorAccess · up to 23 pts

Your edge answers GoogleAgent-Mariner with a block or interstitial. Web Bot Auth (HTTP Message Signatures, RFC 9421) lets an agent prove who it is per request; Cloudflare, Akamai, AWS WAF and Vercel can verify it. Allow verified agents and keep challenging the rest.

# Cloudflare: Security → Bots → Verified bots → allow category "AI Agent"
# Or verify yourself: fetch the agent's key from
#   https://<signature-agent>/.well-known/http-message-signatures-directory
# and check the Signature / Signature-Input headers (tag="web-bot-auth")

2Give agents a front doorProtocols · up to 12 pts

A Universal Commerce Protocol manifest for shopping, or an MCP server card for everything else. An agent that can call an API never needs to hold a customer's password.

GET /.well-known/ucp
{ "ucp": { "version": "2026-01-23",
  "services": { "dev.ucp.shopping": [{ "transport": "rest", "endpoint": "https://www.ebay.com/api/ucp/v1" }] },
  "capabilities": { "dev.ucp.shopping.checkout": [ … ] } } }

# or
GET /.well-known/mcp.json
{ "name": "eBay", "endpoint": "https://www.ebay.com/mcp", "transport": "streamable-http" }

3Publish llms.txtSurface · up to 8 pts

A short markdown map of what the site does, where the important pages are, and how to search or check out.

/llms.txt
# eBay
> One paragraph on what this site is for.
- [Products](/products): how to search and filter
- [Checkout](/checkout): steps and constraints

4Say your stance with a Content-SignalConsent · up to 3 pts

Two lines in robots.txt end the guessing game. ai-input covers agents reading pages on a person's behalf.

User-Agent: *
Content-Signal: search=yes, ai-input=yes, ai-train=no
Allow: /