AI applications and agent engineering
From model calls, workflows, and tool connections to permissions, evaluation, deployment, and real operation. I care less about the demo than the remaining distance to something useful.
ABOUT
Chengbei
Independent developer. I build products, write code, and make complex technology easier to understand.
I like turning a fuzzy idea into something real: understand the problem first, build it, then see whether it actually helps someone.
Some results become products, some become open-source tools. More often, I turn the work into a guide that someone new can follow—without skipping the decisive steps or presenting unfinished work as a success.
Ideas, code, and verification have to meet in the same result.
01
What I keep working on
Learning material for beginners
I unpack work I have actually done: why I chose one route, where it tends to break, and how to recover. The aim is to teach the next decision, not just hand over an answer.
Independent products and public projects
I build small, complete products and publish reusable code, tools, and postmortems along the way. This site holds both the finished pieces and the trail behind them.
02
How I decide the work is done
I look for real outcomes. A page loading is not the same as a release. A running demo is not a deliverable. An answer that sounds right is not evidence.
That is why this site keeps the checks, limitations, mistakes, and unfinished edges. They are not untidy leftovers; they are what make the next attempt better.