Techniques
System Prompt
Also known as: system message, system instruction
In one line
A hidden instruction that sets the AI's role, rules, and personality for the whole conversation.
What does System Prompt mean?
System prompts are the "constitution" of an AI assistant. They define who the assistant is, what it can and cannot do, tone of voice, and output formats — before any user message arrives.
A real-world example
"You are SASHA, a paid-media strategist. Never recommend budgets over £50/day without a warning."