Agent harnesses should be retested every time the model changes
hugobowne · x · 2026-07-23
Hugo Bowne-Anderson argues that much of an agent harness is really a guess about what the model still cannot do.
His advice is to re-test compaction, retries, routing, and planning scaffolds every time the model changes, and remove anything that no longer improves the system.
The linked slide makes the point bluntly: yesterday’s necessary workaround can become tomorrow’s dead weight.
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