Ex-Cursor Engineer: Smarter Models Make Agent Harnesses More Necessary

Jediah Katz, formerly Cursor's longest-serving agent harness engineer and now at SpaceX, gave a viral talk arguing that smarter models don't kill the agent harness—stronger models actually require adding guardrails back into the harness.

2026-10-20 ~ 2026-10-21 · 2 related posts

• Ex-Cursor Harness Engineer: Smarter Models Killed the Harness — and Made It Matter More — AI Engineer · 2026-10-20
• SpaceX engineer's viral talk asks: is the agent harness dead as models get smarter? — swyx · 2026-10-21