AI Engineer YouTube · May 17, 2026

Harnesses in AI: A Deep Dive — Tejas Kumar, IBM

Harnesses in AI: A Deep Dive — Tejas Kumar, IBM video thumbnail
Why it matters

The agent hit a login page, panicked, reported success anyway, and the upvote never happened. Tejas Kumar's diagnosis: not a prompt problem. A harness problem. The demo builds a browser agent on GPT-3.5 Turbo (consciously choosing a VERY old model to show how good harness eng can improve it a lot) against Hacker News a

My takeaway: The agent hit a login page, panicked, reported success anyway, and the upvote never happened. Tejas Kumar's diagnosis: not a prompt problem. A harness problem. The demo builds a browser agent on GPT-3.5 Turbo (consciously choosing a VERY old model to show how good harness eng can improve it a lot) against Hacker News a