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The Domesday Book ofKWJ · AI
Prompting·9 min

System Prompts: A Design Guide for Production

By C.W. Jameson · Published 10 December 2025 · Last reviewed 10 January 2026

System prompts are your model's constitution. Most are written badly and produce variable, unreliable behaviour.

How to write system prompts that produce consistent, reliable model behaviour at scale.