Lesson 1 · 6 min
System Prompts
Where to put role, constraints, and output contract.
Put role and persistent behavior in the system prompt. Put per-call data in the user message. Prompts that move volatile content into the system prompt blow the prompt cache. Order matters: static first, dynamic last.
Quick check
Prompt EngineeringSelect one
Which content belongs in the system prompt vs. the user message?