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AI Wrote Perfect Code. I Built the Wrong Thing 😅

11 min readAug 26, 2026

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You know that feeling when you type one long prompt, hit enter, and watch the agent work for four straight minutes? Files appear. The terminal scrolls. Nothing turns red.

Yeah. I did that this week.

Then I opened the files it had written quietly in the background, and almost none of it matched what was in my head.

Not broken. Not buggy. The code ran. It just answered a question I never asked.

Here is what I actually did wrong, and I want to be honest because I think a lot of people are doing the same thing right now.

I gave the agent one big topic. Not a feature. A topic. The kind of thing you would put on a whiteboard in a meeting and everyone nods at. I described the shape of what I wanted, added a few notes about the stack, and let it go.

In my head, the plan was already complete. I had thought about the screens. I knew roughly how the data would move. I knew which parts talked to which other…

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ZIRU
ZIRU

Written by ZIRU

Lead Principal Data Scientist | Saab Inc. | Depence AI Specialist | San Diego | UCSD | https://www.linkedin.com/in/jhbaek/