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I A/B Tested My AI Agent's System Prompt Against an 11-Minute Version. The Sloppy One Won.

This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.

For two weeks I ran the same AI agent — same model, same tools, same customers — with two different system prompts. Half the conversations ran on the prompt I'd spent a weekend polishing. The other half ran on a prompt I'd written in eleven minutes and was mildly embarrassed by. The embarrassing on…

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  1. 2026-09-06 01:03 · DEV Community — AI
    I A/B Tested My AI Agent's System Prompt Against an 11-Minute Version. The Sloppy One Won.

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