Arthur Katcher

Harness engineer. I build the harnesses, runtimes and deployment layers that AI agents run on. Writing about agent harnesses, computer use, evals and agent security.

Europe (CET), remote Joined on Oct 7, 2026 https://arthurkatcher.com

Work

Harness engineer

Arthur Katcher

Oct 18

I benchmarked Jev's box tool on ScreenSpot-v2 and ScreenSpot-Pro. Here is how well it reads a screen

#ai #agents #machinelearning #computervision

12 min read

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Arthur Katcher

Oct 12

Why computer use benchmarks are so hard to run

#ai #agents #machinelearning #devops

16 min read

Arthur Katcher

Oct 12

How to engineer a Jev harness

#ai #agents #llm #architecture

8 min read

Arthur Katcher

Oct 8

Terminal UIs for Harnesses in 2026: who builds on what, and why

#ai #agents #terminal #cli

9 min read

Arthur Katcher

Oct 7

My checklist for reading computer use benchmarks

#ai #agents #llm #machinelearning

15 min read

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Arthur Katcher

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I benchmarked Jev's box tool on ScreenSpot-v2 and ScreenSpot-Pro. Here is how well it reads a screen

Want to connect with Arthur Katcher?

Why computer use benchmarks are so hard to run

How to engineer a Jev harness

Terminal UIs for Harnesses in 2026: who builds on what, and why

My checklist for reading computer use benchmarks