Prompt queue
You don't have to wait for the agent to finish before you write your next prompt. Send it while the agent is still working, and it goes to the Prompt queue above the task input.
Queued prompts are sent automatically, in order, as the agent finishes the work in front of them. You don't need to send them yourself – the queue is there so you can keep typing, not so you can dispatch prompts by hand. The queue survives a page reload.

Queue a prompt while the agent works
While the agent is working, type your next prompt in the task input as usual. You can also add context to it.
Press Enter.
While the agent works, the send button turns into a stop button, so the key is how you queue. The prompt moves to the queue and runs when the agent gets to it.
Change the queue before it runs
Drag a prompt up or down the queue to change the order prompts run in.
Point to a prompt and click Edit to rewrite it, or Delete to drop it from the queue. You can also double-click a prompt to edit it, or press the up arrow in an empty task input to edit the last one.

Send Now appears only while the queue is paused – see What happens when you stop the agent.
What happens when you stop the agent
Stopping the agent pauses the queue instead of clearing it. Your prompts stay in the list, and each one gets a Send Now button so you can run any of them next instead of waiting for its turn.
Sending a new prompt from the task input resumes the queue. That prompt runs first, and the rest of the queue follows behind it.
When the agent asks you something
A queued prompt is a new instruction, not an answer. When the agent asks a clarifying question or requests permission, answer it in the card where it appears – see Permission modes. Anything you type in the task input goes to the queue and waits, so the agent stays blocked until you respond in the card.