Building your own agent harness beats bloated off-the-shelf frameworks on cost, argues researcher
omarsar0 · x · 2026-09-15
- Off-the-shelf agent harnesses are bloated, trying to solve too many problems nobody needs, and users pay a huge premium for it.
- Building your own harness is one of the biggest levers to drive cost down, even though cost isn't the only reason.
- Omarsar agrees harness engineering is a real skill: it demands understanding the harness internals, the model's capabilities, and how to build good evals — and good tools for custom harnesses are still scarce.
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