Builder's Guide: Cutting Agent Costs 80% by Letting Jev Handle Yes/No Calls
PrajwalTomar_ · x · 2026-09-26
A hands-on guide walks through building a production agentic harness with Jev, with code, architecture, and diagrams for every design choice.
Key points:
- Layered split: Opus handles heavy reasoning while Jev makes every small yes/no decision call from the harness
- Author reports 80% reduction in cost and time
- Standout detail: tool-call failures no longer kill the agent — Jev picks a recovery path in 100ms and keeps running, replacing months of manual fixes
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