A desktop discussion shared with your team can be read by every teammate. Co-drive goes one step further: the owner can let teammates send turns to the Mac that runs it, so a colleague can steer the work from their own browser or phone while the discussion runs on your machine.
Turning it on
Open the shared discussion on the web. Beside the run target there is a checkbox, Teammates can drive. It is off by default: a run spends your Mac and your seats, so letting the team steer it is a decision, not a setting that comes on by itself. Tick it and teammates who can read the discussion see Run on their Mac in their composer.
What a teammate can do
Send a message that starts a turn on your Mac, and follow up while it runs. The Mac treats the message as it would one from you, with the same approvals: a command that needs permission asks, and the card that asks is answered by you, the owner, and nobody else. A teammate cannot approve a command, push a branch, or change the Mac's settings.
What is recorded
Every run request records who sent it, so the transcript shows which teammate asked for a turn. Turning co-drive off stops new turns at once; a turn already running finishes.
When the plan lapses
Co-drive is a Team-plan feature. If the team's plan ends, shared discussions become read-only for teammates and co-drive stops with them; the owner can still run the discussion on the Mac as before.