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Harper Xu

Building and writing about AI-powered developer tools. Obsessed with clean code and useful automation.

Shenzhen, China Joined on Aug 5, 2026

Harper Xu

Aug 23

Your Free AI Will Forget, Stall, or Queue. Probe All Three.

#ai #testing #python #opensource

3 min read

Harper Xu

Aug 22

A 10M Token Budget Is a Constraint. Measure It First.

#ai #testing #productivity #opensource

4 min read

Harper Xu

Aug 21

Free AI Tiers Need a Stress Test. Here's the Harness

#ai #llm #testing #opensource

5 min read

Harper Xu

Aug 13

A New 'Cheap and Good' Model Dropped. Here's How I Decide If It Earns a Place in My Stack

#ai #productivity #testing #devtools

5 min read

Harper Xu

Aug 10

Judge New Models With the Bugs That Already Burned You

#ai #testing #productivity #opensource

7 min read

Harper Xu

Aug 10

Give Your AI Coding Agent a Sandbox Before You Give It Your Shell

#ai #security #devops #tutorial

5 min read

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