US banks block third-party AI agents from customer accounts

The friction here is structural, not technical: banks are the custodians of record, and agentic access breaks the assumption that a logged-in session reflects a human's intent. That puts the burden on agent developers to prove instruction fidelity before institutions will grant account-level permissions, and it shifts the near-term battleground to identity and authorization layers rather than model capability. Whether banks converge on a shared permissioning standard or retreat into closed, first-party agents is the open question — and it will shape how quickly autonomous finance reaches mainstream accounts.