Why Amazon Opened Seller Central to Claude Just Days After Blocking Metas Muse

Amazon just drew a sharp line between which AI agents get access to its business and which don't. At its Amazon Accelerate conference in Seattle on September 23, the company opened its Seller Central APIs to outside AI agents for the first time, launching a US beta plugin that lets sellers manage inventory, pricing, listings and analytics through Anthropic's Claude or Amazon's own Quick assistant — without ever opening Seller Central itself.

Amazon VP Mary Beth Westmoreland put the ambition plainly: "Our vision was that [sellers] would never have to log into Seller Central." The new Selling Partner plugin runs on Amazon Bedrock, combining Amazon Nova and Claude, and connecting takes about a minute with no coding required. A few details define how the rollout actually works:

• Amazon says roughly 90% of sellers already use outside AI tools to run parts of their business, and every action still requires seller approval with a full audit trail
• Every primary account holder worldwide can claim a free 12-month Amazon Quick Plus subscription through December 31, 2026, plus coverage for two co-workers
• Anthropic field CTO Eric Burns said the plugin "brings these data-driven insights into sellers' Claude account" alongside their existing accounting and supplier connections

The timing makes the announcement impossible to read in isolation. Just days earlier, Amazon blocked Meta's Muse agent from shopping on its own site, citing undisclosed browsing and credential concerns .

Amazon has made clear it still decides which platforms get in, telling GeekWire that outside agents need to identify themselves and follow the rules of the sites they use. Amazon is also a major investor in Anthropic, whose models already power the existing Seller Assistant tool.

That combination — welcoming a company it backs financially while locking out a rival's shopping agent in the same week — makes this less a story about openness and more one about Amazon deciding, transaction by transaction, exactly which AI companies get to touch its marketplace.