Vercel's Chat SDK now supports durable human-in-the-loop approvals via a new `chat/workflow` subpath. A single `requestApproval` call posts an interactive card with Approve/Deny buttons into a chat thread and suspends a Workflow SDK workflow until a decision is made. The pause survives deploys and restarts, can last seconds to days, and requires no custom approvals table or polling loop. Features include scoped approvers (restricting who can decide), verified decisions via platform signature checks, and an automatic audit trail that edits the card in place once resolved or timed out.
