70–80% quality is insufficient for production

Seventy to eighty percent functionality is enough to excite leadership and grow the team, but not enough to meet the reliability threshold for production use—beyond that point, developers confront deep, opaque call stacks and prompt or tooling complexity.

Dex Horthy·Published Jul 3, 2025

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12-Factor Agents: Patterns of reliable LLM applications — Dex Horthy, HumanLayer

Original excerpt

It's enough to get the CEO excited and get six more people added to your team. But then you kinda realize that seventy, eighty percent isn't quite good enough, and that if you wanna get past that seventy, eighty percent quality bar, you're seven layers deep in a call stack trying to reverse engineer how does this prompt get built

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