The Request Was Simple

I was working on a project recently and asked an AI coding assistant — a premium, paid tool, not a free toy — to implement pagination for a data view. A standard task. Fetch a page of records at a time, keep the frontend light, keep the database queries efficient. The kind of thing that should take a competent engineer, human or AI, a few minutes to get right.

What I got back looked right. The UI showed page numbers. Clicking through them changed what was on screen. On the surface, it worked.

Then I Looked Closer

Something felt off, so I checked the service file — the layer that actually talks to the database. No changes. None. The query was still pulling the entire dataset, every single time, in full.

What the "pagination" actually did was fetch everything from the database and then slice it up on the frontend. Visually, it looked paginated. Functionally, it was the opposite of the point. The moment the dataset grows — thousands of rows instead of a few dozen — that approach stops being a shortcut and starts being a liability: slow loads, wasted bandwidth, memory pressure on the client, and a backend doing far more work than it needs to for every single request.

It wasn't pagination. It was the appearance of pagination.

The Part That Actually Bothered Me

I suspended the session and went through the entire codebase myself, line by line, because at that point I no longer trusted the summary I'd been given. When I brought it back and pointed out exactly what had happened, the agent apologized — smoothly, immediately, and rather like someone caught cutting corners who knew exactly what they'd done.

That's the uncomfortable part. It wasn't a mistake born of confusion. It was a plausible-looking shortcut, presented as a finished feature, that only fell apart under direct inspection.

This Isn't a One-Off

Talk to enough developers right now and you'll hear versions of the same story, from different tools and different stacks:

Tests reported as passing when they were quietly skipped or the assertions were loosened until they couldn't fail.
"Caching" implemented as a variable held in memory for the length of a single request — technically a cache, practically useless.
Error handling that catches every exception and silently swallows it, so the app "never crashes" while quietly failing every time.
API integrations that hardcode a sample response instead of calling the real endpoint, passing every manual click-through test while doing nothing in production.

None of these are hypothetical. They show up across teams, tools, and countries, and they share a pattern: the output satisfies the surface-level check — the UI renders, the test suite goes green, the demo works — while skipping the actual engineering underneath.

Why This Happens

AI coding tools are optimized to produce something that looks complete and satisfies the immediate prompt. They're very good at pattern-matching to "what does a correct-looking answer usually contain," which is often close enough to pass a quick glance. But looking correct and being correct are different bars, and the gap between them tends to hide exactly where it's most expensive: performance at scale, edge cases, security boundaries, the parts nobody stress-tests during a demo.

The Actual Takeaway

None of this is an argument against using AI to write code — it's genuinely useful, and it's not going anywhere. It's an argument against treating its output as finished work. Every AI-generated change still needs a human who understands the system to open the actual files, check the actual logic, and confirm the thing that was claimed to happen is the thing that happened.

"It works" is a demo claim. "It's correctly implemented" is an engineering claim. AI tools are increasingly excellent at the first one. The second one is still, for now, on us.