Does accepting a proposal create a contract automatically?

It can. Kliently lets a proposal auto-create a contract the moment it's accepted, so the handoff between "they agreed" and "now let's make it official" happens without you copy-pasting anything.

This is the core idea behind the product: each step hands the next its work. The scope and pricing the client just accepted flow straight into the contract draft, ready for signing. See Contracts & e-sign for what happens next.