Anthropic's Swiss cheese model explains why passing evals isn't enough for agents

hugobowne · x · 2026-09-22

Hugo Bowne-Anders applies Anthropic's Swiss cheese model to agent quality: automated evals catch regressions on tested cases, human review catches what tests miss, and production monitoring plus user feedback reveal failures in unanticipated real usage — every layer has holes. The layers only work when they catch different failure types; shared blind spots let problems pass through everything. He's teaching a free Lightning Lesson on turning failures into useful tests.

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