Vibe coding works until it doesn’t: know where the line is
Vibe coding is not complicated to define. You describe what you want in plain language, the AI writes the code, and you steer by whether the result looks right. No reading every line. No writing specs. Just iterate until it works.
That’s a real shift in how software gets built. For most of computing history, you had to know how to make the computer do something before you could make it do anything. Vibe coding removes that requirement. You only need to know what you want and whether the output matches.
The problem is not the approach. The problem is that most people never notice when it stops being the right one.
Why the first 80% feels effortless
Early in a project, vibe coding wins on every dimension that matters. You’re exploring, so speed beats precision. If the AI gets something slightly wrong, you catch it immediately and correct it in the next prompt. Nothing is at stake yet: no real users, no real money, no data anyone will miss.
Prototypes, throwaway scripts, weekend projects, learning a new framework, internal tools only you will ever touch: these are the right places to lean in hard. The cost of being wrong is a few wasted minutes. The speed is unbeatable.
The mistake is not vibe coding at this stage. The mistake is not noticing when you’ve quietly crossed out of it.
⚠️ Where it starts to bite
The trouble starts the moment your code touches something that can hurt someone if it’s wrong. The AI writes code that looks finished. It runs. The demo works. But running and being correct are two different claims, and vibe coding only ever checks the first one.
The bugs that survive this process are invisible to the vibe. The login check that passes for the wrong reasons. The calculation that’s right for your test case and wrong for everyone else’s. The database call that works until two people hit it at once. None of those show up until production, at the worst possible time, in front of exactly the people you didn’t want to see them.
There’s a second trap too. When something breaks in code you never really read, you can’t fix it. You go back to the AI, it confidently changes three things (two of them unrelated), and now you’re negotiating with a system you never understood. The speed that got you here is gone.
The Vibe Line: four questions before you ship
Here is the framework worth keeping. Before you ship anything you vibe-coded, run it through four questions. The author calls the boundary they draw the Vibe Line.
| Ask yourself | If the answer is yes |
|---|---|
| Does it touch customer data? | Stop vibing. Read the code, or have someone who can. |
| Does it touch money? | Stop vibing. This needs tests, not vibes. |
| Does it touch security or logins? | Stop vibing. Confident-looking auth code is the most dangerous kind. |
| Is it hard to undo? | Stop vibing. Anything you can’t roll back needs real review. |
If every answer is no, you’re on the safe side of the line. Keep going, keep it fast. If any answer is yes, the job changes. Not stop using AI, just stop trusting its output because it looks finished. Now you read the code, write a test, ask a human, add a rollback path. The AI still writes. You just stop treating the output as done.
What this means for your value as a builder
There’s a fear underneath the whole vibe coding debate: if the AI writes the code, am I a fake engineer? The answer is no, and here is why.
Generating code was never the hard part of engineering. Deciding whether it’s actually correct, safe, and worth trusting always was. Vibe coding hands you the easy 80% for free. That makes the remaining 20%, specifically the judgment about when to stop, the entire value you add.
The AI can write the code. Deciding when to stop trusting it is still your job.
In a world where anyone can generate a working demo, the person who knows where the Vibe Line is becomes more valuable, not less. A working first draft in twenty minutes is a real advantage whether you’re a beginner shipping your first app or a senior engineer prototyping before a meeting. The people who refuse to touch vibe coding out of pride are just slower.
When This Works
- Prototypes and proof-of-concept builds where nothing real is at stake
- Internal tooling only you will ever use
- Learning a new framework or language without production stakes
- Throwaway scripts and weekend projects
When It Does Not
- Any code path that handles customer data or PII
- Payment flows, billing logic, or anything touching money
- Authentication, authorization, or session management
- Database writes, migrations, or anything hard to roll back
Same AI. Same speed. Just with your eyes open on the right side of the line.
I’m founder of BizStack at Cagri Sarigoz LLC and a passionate advocate for entrepreneurs.
With over 14 years in tech, marketing, and AI, including my role as Head of SEO at CitizenShipper and co-founder of TaleBot at Intale AI, I’m dedicated to sharing genuine, useful product insights and tips.
At BizStack, I aim to cut through the digital noise to provide clear, actionable advice.
And more than all else, I’m a father to a (always) little girl and a husband.
Contact me at [email protected] for assistance.
