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System Prompt Builder
Fill the parts you need and leave the rest empty. Write {{name}} where a value changes per request; the page lists the variables and shows a filled-in preview.
What it is for?
System prompt
Variables
What it is for?
A system prompt is the standing instruction an AI model reads before every user message. A good one is short and concrete: who the model is, what it should do, what it must not do, and what the answer should look like.
Tips
- Say what to do, not only what to avoid. Give the reason when a rule is not obvious.
- One or two real examples teach the format better than a paragraph about it.
- Put facts that change (dates, prices, the user name) in {{variables}} and fill them in your code.
- For JSON, also turn on the structured output or JSON mode of the API you use; the prompt alone does not guarantee valid JSON.
- Do not put secrets in a system prompt. A determined user can often get the model to repeat it.