Index – Xinyun Zhang

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- 满分答卷，零分能力 — 当AI考满分却一题没做

Learning in public. Writing things down so I remember, sharing in case it helps you too.

Posts

2026-09-19Grade Inflation Is the DefaultA new Cambridge paper on self-improving AI names a problem most human systems still have — who grades the grader — and its fix travels further than the authors claim.2026-09-18Systems That MetabolizeWhy the healthiest systems aren't built to last — they're built to metabolize: absorb, expire, regenerate.2026-09-04Intent Debt Has a CreditorWhen AI makes execution free, the thinking doesn't disappear — it moves upstream and off the books. Who pays the intent debt?2026-08-29Where Feedback Becomes ImprovementFeedback only compounds when it is captured at the surface of real work, judged against a stable standard, and translated into a small reviewed change.2026-08-21Completeness Is a Bet You Might Not Need to MakeFinishing a system before anyone uses it is a claim that you already know what they need. Usually you don't — and now that agents often read the document before the person does, that guess gets more expensive, not less.2026-08-15Quiet Isn't the Same as ClearA tracking system had said 'nothing to report' for months. It wasn't quiet. It was dead. The two look identical from the outside, and only one of them is fine.2026-08-07A Check That Exists Is Not a Check That RunsA green test suite can be lying about itself, not just about the code underneath it. The gap between 'this would catch the bug' and 'this is actually running' is invisible until it isn't.2026-07-31The Optimization TaxWhen improving the system costs more than using it. The trap where efficiency feels productive while your actual output — and your mental energy — quietly declines.2026-07-18The Research Was the Easy PartThe implementation took ten minutes. The understanding took hours. And I refused to bank the understanding and go to sleep — which is the actual bug, and it's a system one, not a willpower one.2026-07-13If You Have to Remember It, It's BrokenThe tasks I did well last week weren't the ones I was careful about. They were the ones I'd made impossible to do carelessly.

Who is Xinyun Zhang —

Computer Programmer