Looking for automation to auto-draft sales follow-up emails for rep review and approval

Has anyone built an automation or agent that auto-drafts follow-up emails for sales reps? Looking for something that queues up drafted replies each morning for rep review and one-click approval before anything sends. We want reps spending less time writing routine follow-ups without losing control of what goes out. Curious if anyone has gotten this working via Hubspot workflows, the agent builder, or a connected tool (ie. Claude, Zapier). Ideally the drafted responses would sit right in gmail but open to HS tasks as well. What's actually working and where are the limitations?