Builder Cuts Agent Workflow Costs ~80% with a Jev + Opus 5.5 Agentic Harness
BLUECOW009 · x · 2026-09-25
A developer shares a complete builder's guide for constructing an agentic harness using Jev + Claude Opus 5.5, claiming 80% reduction in costs and time in his workflow.
The core idea splits the system into two layers:
- Decision layer (Jev): picks relevant project notes before loading context, routes suitable tasks to a faster worker model, chooses recovery paths when tools fail, and runs focused checks before the full test suite
- Reasoning layer (Opus): handles only hard reasoning, choosing from options the harness prepares and validates
The article includes step-by-step instructions with code and architecture diagrams, fully reproducible.
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