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BUILDING-CUSTOM-ASSISTANTS5 MIN READ

Sort: Instructions, Knowledge File, or Live User Request?

Differentiate stable behavior rules, source material, and one-off request details.

Place each item in the layer where it belongs most naturally. Instructions / system prompt Knowledge file / project knowledge Live user request “Use the uploaded policy before general knowledge and cite the section title.” The 2026 travel reimbursement handbook PDF. “For this reply, address the note to the London office manager.” A pricing exceptions table that changes each quarter. “If the sources do not answer, say what is missing instead of guessing.” “Use a warmer tone because this customer is already upset today.” Instructions Knowledge Live request Rule, source, or one-off detail?

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