The agent could not access decathlon.fr's homepage or key pages (403/404 errors) and assembled a partial answer from web search results and one official marketplace page. The core business model and positioning remain unverified, though marketplace mechanics and return-policy fragments were recovered from the one accessible official page and third-party guides.

• ›Homepage and standard pages blocked: the agent encountered HTTP 403 on the homepage and 404 on guessed URLs (service-client, a-propos), forcing a fallback to web search and requiring explicit disclaimer.
• ›One official page reachable: the marketplace page (step [6]) was the only decathlon.fr content successfully fetched and provided authoritative detail on partner shipping, return mechanics, and prepaid labels—but contradicted itself on return windows (30 vs. 14 days).
• ›Heavy reliance on third-party blogs: 75% of navigation was URL guessing or web search; third-party sources disagreed on return windows (30/60/90/365 days), shipping fees, and refund timing, with publication dates ranging from 5 days to 4+ years old.
• ›Verification impossible for core claims: the agent could not confirm Club card eligibility, its free/paid status, how partner prices are set, or how Decathlon differentiates itself—all required by the task—because those pages were unreachable.
• ›Self-contradicting official source: the marketplace page stated both '30 jours' and '14 jours à compter de la réception' for returns, leaving ambiguity even in the one trusted source.