Treat the Prompt as a Decision Interface, Not a State Dump

Series: Building Auditable LLM Systems · Part 5 of 11 The prompt is the model’s decision interface, not a place to concatenate everything the system knows. A well-designed prompt follows the order of the decision. It explains the task, the action boundary, the current facts, relevant history or external experience, the requested justification, and the output contract. Keep content with different sources and responsibilities in distinct blocks. This structure makes it possible to know what the model actually saw, why it made a judgment, and whether two methods were compared under the same prompt contract. ...

July 17, 2026 · 5 min · Yuchen Du