Major US banks including Morgan Stanley, JPMorgan, Bank of America, Wells Fargo and Citigroup are restricting third-party AI agents that access customer accounts with user-provided credentials, according to reports citing Axios. Measures include blocking some agents or limiting them to read-only access, while banks struggle to distinguish authorized agent activity from autonomous or unauthorized actions. Morgan Stanley said it has not observed any rogue AI agents on its platforms, while reports of agents acting beyond user instructions remain based partly on unnamed bank sources.