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I Stopped Writing Prompts and Started Writing Fixtures

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

For the first two weeks I treated agent quality as a prompt problem. Reword the instruction, add an example, add a rule. It moved nothing. The thing that moved the numbers was fixtures: a fixed starting state plus a fixed expected end state, checked automatically. What a fixture looks like for an a…

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  1. 2026-10-20 23:26 · DEV Community — AI
    I Stopped Writing Prompts and Started Writing Fixtures

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