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Software Testing Blog
Vibe Coding Gone Wrong (And How to Actually Verify the Vibe)
by Thijs Kok
5 min read
Apr 08, 2026
Summary: Vibe coding enables rapid software creation through natural language prompts but introduces significant security and reliability risks that must be managed through rigorous human-led verification and structured requirement testing.
Syntax-perfect programming—and the apparent need for it—seems to be hitting a speed bump.
It’s being replaced by something much, much more relaxed: vibe coding.
In this new status quo, developers—and people who have never touched a terminal—are moving away from writing every line of code by hand. Instead, they use natural language prompts to describe what they want to an artificial intelligence (AI) agent. They describe the vibe of the feature they want, and the AI figures out the logic and the deployment.
It’s fast. It’s also a nightmare for anyone responsible for software reliability. (The numbers back this up: 50% of very frequent AI coding tool users cite more security vulnerabilities and concerns post-tool-adoption, as opposed to 31% of frequent users, and 26% of occasional users.)
But, that said, use of these tools is everywhere.
Marketing managers are vibing internal dashboards into existence over lunch. Sales ops teams are prompting custom customer relationship management platform integrations during coffee breaks. But there’s a hidden danger: The easier something is to build, the easier it is to break. When you don’t understand the code the AI wrote, you can’t know where the vulnerabilities are hiding.
When the AI Goes Rogue: Three Cautionary Tales
A “vibe” is rarely enough to ensure a stable release. These real-world failures show us precisely why.
1. The Order-Taker That Lost Its Mind
McDonald’s recently ended an AI drive-thru experiment after things got weird. As The Guardian reported, the system lacked strict logical guardrails. Without a human or a test plan to check the work, the AI started adding hundreds of dollars of bacon to … ice cream cones. The AI followed a prompt, but, clearly, it wasn’t the solution the business actually wanted.
2. The Agent That Opened the Front Door
In one reported incident, a Replit AI agent began deleting security protocols to “make the code work.”
AI is a literalist. If a security permission stands in the way of a functional goal, the AI might just remove it. If the person vibing the code doesn’t know how to check underlying permissions, they’re pushing a ticking time bomb to production.
3. The Hallucinated Bug Report
AI is famously confident, even when it’s wrong.
Research summarized on Wikipedia suggests that large language models don’t produce reliable bug reports. An AI might tell you a bug is fixed when it has actually just hidden the error or suppressed the notification. If you ask an AI to test itself, it will give itself an A+, even while the app is crashing in the background.
Why AI Needs More Testing Than Your Senior Dev
It sounds backward, but AI-generated code requires more testing than code that a human wrote.
Human developers leave a trail of intent. You can perform a code review and understand why a certain logic gate exists. With AI, you only have the result. This is the “black box” problem. Because you can’t verify the thought process, you have to verify the outcomes with more detail.
AI also doesn’t know how to build safe apps by default. As Final Round AI noted, AI prioritizes the “happy path”—the scenario where every user enters the correct data. It often ignores the edge cases that lead to data leaks or system crashes.
For the accidental developer building tools with AI, the dilemma is even sharper. If you don’t know how to code, you probably don’t know how to perform regression testing. You assume that if the button works once, the app is finished.
In reality, that button might have broken three other features you didn’t think to check.
How to Conduct a Vibe Check: A “Do This, Not That” Guide
To use vibe coding without crashing your systems, you need a protocol.
Do This Not That
Treat every AI-generated feature as a suspicious stranger until proven innocent. Assume the code is clean because the AI said so.
Involve actual humans to perform user acceptance testing (UAT). Ask the AI to test its own work.
Map your AI prompts back to business requirements in a test management tool. Vibe until the screen looks pretty and hope the logic holds up.
Test the edge cases, such as entering emojis into a currency field. Test only the path where everyone follows the rules.
Use a tool such as TestMonitor to track every bug the AI missed. Keep a mental list of things that seem “off.”
How to Bridge the Gap Between a Vibe and a Verified Release
The only way to move fast without a headline-grabbing failure is to build a safety net.
Traceability Is the Fix
Requirements-based testing is the only way to ensure an AI agent stays on task. By mapping your initial prompts to specific test cases in a focused tool, such as TestMonitor, you can verify that the vibe actually meets the business need.
Empower the Accidental Developer
You don’t need a computer science degree to follow a professional testing protocol. TestMonitor’s user interface allows non-devs to organize their UAT, track feedback, and manage issues without technical jargon. It turns a “guess-and-check” process into a structured workflow.
Embrace Centralized Sanity
Move the feedback loop out of the AI chat window. When a bug is found, humans need to triage, assign, and track it. Centralizing this data ensures nothing falls through the cracks when the AI starts hallucinating.
How to Keep the Vibe and Lose the Risk
Vibe coding is a superpower, but (listen to us; trust us on this!), every superpower needs a handler.
The faster you build, the faster you need to test.
The future belongs to the “verified vibe”—the marriage of AI speed and human structure.
Keep the creativity. Don’t skip the check.
Don’t let your AI-generated projects turn into a McDonald’s-sized headline.
Frequently Asked Questions About Vibe Coding
What exactly is “vibe coding”?
Why is AI-generated code considered a security and reliability risk?
Why does AI code require more testing than human-written code?
What is the “happy path” problem?
How can teams “vibe check” their code to ensure it’s safe?
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Topics:Software Testing 101
Table of Contents
When the AI Goes Rogue: Three Cautionary Tales
1. The Order-Taker That Lost Its Mind
2. The Agent That Opened the Front Door
3. The Hallucinated Bug Report
Why AI Needs More Testing Than Your Senior Dev
How to Conduct a Vibe Check: A “Do This, Not That” Guide
How to Bridge the Gap Between a Vibe and a Verified Release
Traceability Is the Fix
Empower the Accidental Developer
Embrace Centralized Sanity
How to Keep the Vibe and Lose the Risk
Frequently Asked Questions About Vibe Coding
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