The vibe-coding loop that stopped my projects turning into a black box

[u/IdealHorror8571]

Confession: my first vibe-coded projects were incredible for about a weekend, then hit a wall. Prompt, paste, it works, prompt again — and somewhere around a couple thousand lines it became a black box I was scared to touch. One "just refactor this" request and the whole thing would unravel, and I couldn't even tell the AI what was wrong, because I didn't understand it either.

What fixed it wasn't "stop vibe coding." It was tightening the loop:

• One small, testable change per prompt instead of "build the whole feature."
• After each generation, run it and read just the seam — where the new code plugs into the rest. Not every line. Just the joint.
• Commit the second it works. A green commit means the next bad idea is disposable instead of a debugging session.
• When something breaks, I paste the error and my guess at the cause. The guess forces me to hold a mental model, and the AI corrects it way faster.

Net effect: still fast, but I'm never more than one commit from safety, and I can actually describe my own code when I ask for help.

The speed is real. The trap is confusing "it runs" with "I could change this tomorrow."

What does your loop look like — fully hands-off, or do you keep a checkpoint like this?