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What building an agent harness around GPT-3.5 Turbo taught me: every fix was code, not a prompt

This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.

I gave a talk at AI Engineer Europe on agent harnesses, and the live demo taught me more than the slides did, so here is the short version. The task: an agent drives a real browser with Playwright and upvotes the top story on Hacker News. I used GPT-3.5 Turbo on purpose, and I set one rule: the pro…

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  1. 2026-09-14 11:28 · r/AI_Agents
    What building an agent harness around GPT-3.5 Turbo taught me: every fix was code, not a prompt

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