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A wall of steel-mesh sandbox cages in a bright evaluation vault, most holding a quietly running test rig, with one cage's rig caught half-drawn onto its tray as a red quarantine tab is clipped to its handle

Why Average Success Rate Hides the Failures That Matter Most

A 99 percent success rate says nothing about what the other one percent contains. Evaluating an agent for consequence, not just frequency, is a different discipline, with its own tests and its own statistics.

By Brecht Corbeel · August 23, 2026 · 19 min read

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