WHAT NEW IN X11.05 THU

AI collections from X · 23 collections · 69,408 posts

jevPOST

omarsar0: building a custom agent harness with Pi SDK and Jev

The author argues that System One decision models make custom harnesses far more valuable, and shares a practical guide to wiring Jev into a Pi SDK harness for decision-making.

elvis
@omarsar0Archived 2026.09.26Originally posted 2026.09.25
elvis @omarsar0Originally posted 2026.09.25
Open original on X

Own your harness, folks. I feel like System One models take custom agent harnesses to a whole different level. It's not a surprise. This comes down to needs that haven't been met with System Two models alone. A need to be in control of your intelligence stack. A need for more reliable agents. Combining System One and System Two models is way better than just relying on one alone. A need for richer agent experiences (more personal and proactive agents). A need to squeeze out more value per token used. You can check my most recent guide on building a custom harness with Pi and Jev to learn more: https://academy.dair.ai/resources/jev-decisions-in-a-pi-sdk-harness But let's not stop here. I expect a new wave from frontier labs pushing decision models further. And even better tools to build even more customized decision models on top. There are more layers to this. This is great news for us builders and an incredible opportunity for those who specifically build custom harnesses.

This post quotes another post: “Jev vs CLM: two routes to System One decisions”

x.com/omarsar0/status/2103513870904053936Archived 2026.09.26 10:11