Walmart announced on October 21, 2026, that it launched an Agent Gateway letting approved agents using the Model Context Protocol search Walmart and Sam's Club inventory and make purchases, with spending limits, per-transaction approval and returns on agent purchases that went wrong. The discussion has moved from the terms of the offer to its commercial pull: Walmart says Sparky users' order values ran 40% higher, while Meta says a quarter of Muse users shop with it, averaging $200. What remains open is whether those figures reflect agent-driven spending or the users who adopt agents early.