Claude+small-model harness cuts 1,000 AI decisions from $605 to $0.17

jamestagg · x · 2026-09-30

polydao shares an agent harness skill claiming 1,000 decisions cost $0.17 instead of $605 on a cold frontier model. The core idea: "Claude proposes, Jev answers, code decides," with a receipt logged at every step.

The six-step loop:

Benchmarks: 0.2s median per call, $0.0002 per desktop step, 49/49 WebMCP tasks passed. Key insight: "I don't know" is a real answer — at 38% confidence Jev falls back to a pre-written action instead of forcing an expensive model to guess.

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