Amazon has announced that it will open up its seller management tools to outside AI agents, starting with a plugin that connects to Anthropic's Claude. The beta version, launched in the United States, lets independent sellers handle tasks such as checking inventory and adjusting prices without logging into Seller Central at all. In the same week, however, Amazon blocked Meta's general-purpose AI agent Muse from accessing its retail site, highlighting a broader standoff among major platforms over how far AI agents should be allowed to reach into e-commerce.
What the new plugin does
The new plugin lets outside AI agents call into Amazon's seller management system, known as Selling Partner, through a single integration. Behind the scenes, it runs on a hybrid setup combining Anthropic's Claude with Amazon's own Nova models on the Amazon Bedrock cloud platform, a design intended to avoid depending on a single AI provider. Setup takes about 60 seconds and requires no coding. Once connected, sellers can ask the agent to check inventory, adjust prices, or update listings through chat rather than opening the dashboard, though every action still requires the seller's explicit approval before it is carried out.
Alongside the plugin, Amazon also rolled out an upgraded Seller Assistant featuring a visual "canvas" for reviewing pricing and ad campaign performance, plus a free 12-month subscription to the paid Amazon Quick Plus service for primary account holders, running through December 31, 2026.
Why Amazon is opening up now
According to Amazon, independent sellers account for more than 60 percent of all units sold on its platform worldwide, and seller fees brought in 46.8 billion USD (about 7.35 trillion yen) in the second quarter of 2026 alone. Roughly 90 percent of sellers are already using some form of outside AI tool in their operations, according to Amazon's own research. Rather than leaving that demand to unofficial tools, the company appears to be building an official channel that reduces the risk of sellers' credentials leaking through unsanctioned integrations while keeping that activity inside its own ecosystem. An Amazon executive overseeing the plugin said the goal was to bring the tools to sellers "where they already work," so they would never need to log into Seller Central at all.
Muse locked out, while ties with Anthropic deepen
In the same week as the announcement, Amazon cut off access to its retail site for Meta's general-purpose AI agent Muse. Amazon said Muse had not obtained permission to browse its site and had failed to identify itself as an AI agent while doing so, raising concerns that customer login credentials could be exposed. Meta has disputed this, saying Muse cannot access passwords or payment information. Following the block, Muse has expanded its reach to other retail sites including Walmart, Sephora, and Best Buy. Meta's stock has climbed roughly 20 percent since Muse launched on September 8, adding about 200 billion USD (about 31.4 trillion yen) in market value, according to reports.
Amazon's relationship with Anthropic, by contrast, keeps growing closer. Amazon has invested roughly 13 billion USD (about 2.04 trillion yen) in Anthropic to date, with a framework in place for an additional 20 billion USD (about 3.14 trillion yen) tied to certain conditions. Anthropic, for its part, has committed to spending more than 100 billion USD (about 15.7 trillion yen) on AWS technology over the next decade, tying the two companies together through both capital and technology.
Summary
Amazon is drawing a clear line: opening its seller tools to AI agents it works with directly, such as Claude, while shutting out a rival's agent that tried to access its site without permission. The episode illustrates how major platforms are starting to draw boundaries around whom an AI agent is allowed to act on behalf of in real commercial transactions, not just in chat. Expect this tug-of-war over how far AI agents can reach into online retail to keep playing out across other major sites as well.
Exchange rate used: 1 USD = 157 JPY (as of September 26, 2026)
