What to say when he texts sounds good let me know

Treat the line as him handing the decision back to you. He agreed to the idea but didn't name a day, so the plan is still floating. Sometimes that's just how someone texts. Sometimes he's happy to go along with whatever you suggest, and sometimes he's waiting to see if you'll commit before he does. Look at the rest of the thread before deciding which one it is. If he's been asking you questions and picking up the conversation quickly, the phrase is probably lazy wording and nothing more. If your last few messages got one word replies, he may be checking whether you'll lead.

Either way, don't read it as a rejection. He said yes to the plan. What's missing is a date, and that's a logistics gap you can close in one message.

The move is to turn the open plan into a specific proposal he can accept with a single word. Name a day, a rough time window, and a place you'd actually go to. Offer one option, not two or three, because a menu hands the choosing right back to him. Put the plan in the first line so he sees it before anything else. Keep the length close to his, since a short casual line followed by a paragraph reads like you're treating a loose idea as a formal meeting.

Also confirm the part you both already agreed on. If he said drinks sounded good, the message should be about drinks. Skip the explanation for why you chose that night, and skip asking how he feels about it. Your job is to make the next step obvious enough that he doesn't have to think about it.

Send your proposal during the day, when he's likely to be between things and able to glance at his phone. Late night plan messages tend to get pushed to morning and then forgotten. Give him about a day to answer. If nothing comes back, send one light follow up that refers to the same plan and adds a small new detail, like the place or the time. Don't stack messages or ask whether he's still interested, because that puts the focus on his feelings instead of the plan.

If he answers with another vague line, don't reopen the menu. Restate the same date once and let him respond to that. If he still won't name a time after that, the plan has stalled and you can let it go without a drawn out explanation. His response to a clear proposal is the most useful information you'll get.