A seller’s account checkup in Anthropic’s Claude app, using Amazon’s new selling partner plugin. (Amazon Image) Amazon announced new AI tools for its independent sellers Wednesday, led by a plugin that lets them run their Amazon businesses from Anthropic’s Claude or Amazon’s own Quick assistant. The idea is to let sellers check inventory, adjust prices and update listings without opening Seller Central, which merchants have used for years to manage their Amazon businesses. Amazon says about 90%...