Calendly links work until the other side is a person who just wants to write "does Tuesday work?". A scheduling agent with an inbox handles exactly that.
Loop assistant@agents.yourcompany.com into any thread.
The agent proposes slots and handles counter-proposals in thread.
Once agreed, it confirms to everyone and can trigger your calendar integration.
The other side needs nothing but email.
Replies to existing threads are never throttled. New outreach is quota-gated and can require human approval, so your agent stays useful without becoming a spam risk.
send_email {
to: ["partner@firm.com"],
subject: "Re: Catch-up next week",
body: "Tuesday 10:00 or Thursday 15:00 both work on our side. Which do you prefer?"
}