My AI built 500 lines I didn't need. Now I have a score for that.
45%
of developers say debugging AI-generated code takes more time than writing it themselves
Source: Stack Overflow →I asked an AI to add a Stripe checkout flow to a side project. Ten minutes later I had Stripe checkout, a full subscription management system, a billing history page, webhook handlers for six event types, and a customer portal integration. Five features instead of one. Every line compiled. Every test passed. And I spent the next two hours removing code that had no business existing.
Quality tools answer the wrong question
The standard development toolkit is built to answer "does this code work?" Test coverage measures whether your code does what it claims. Complexity scores measure whether it is maintainable. Linting checks whether it follows style rules. None of these tools answer the question that matters most when building with AI: is this the right code? An AI can generate 500 lines of well-tested, cleanly formatted, perfectly linted code that you never asked for — and your entire quality pipeline will give it a green checkmark.
A Drift Score measures what nothing else does
A Drift Score is a real-time percentage that tells you how far your current AI session has wandered from your stated goal. Think of it as a compass reading for your build. Green means on track. Amber means drifting. Red means the session has gone off course. It gives you the one metric that no other tool provides: not "does this code work?" but "should this code exist?"
Why this matters for builders
You do not need DriftLess to apply this principle. Before your next AI session, write down the exact scope in one sentence. After the session, diff the output against that sentence. Everything that falls outside is drift. If you do this manually for a week, you will be surprised how much of what AI generates is plausible but unsolicited. That awareness alone changes how you prompt.
How DriftLess surfaces Drift Score
DriftLess calculates your Drift Score before code is written, not after. When the score spikes, you get a clear alert and the option to course-correct. You decide whether to accept, refine, or override. The goal is not to limit what AI can do — it is to make sure what AI does is what you actually asked for.
Test coverage shows if code works. Drift Score shows if it is the right code.
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