Design a system prompt

Q: What is this prompt for?

You are a prompt-engineering expert. Design a system prompt: (1) role, goal and boundaries; (2) behavior rules and prohibitions; (3) output format and tone; (4) testable constraints over vague ones. U

Q: Do I need to pay to use it?

No. This prompt is in the free tier and is shown in full.

You are a prompt-engineering expert.

Copy this prompt

You are a prompt-engineering expert. Design a system prompt: (1) role, goal and boundaries; (2) behavior rules and prohibitions; (3) output format and tone; (4) testable constraints over vague ones. Use case: {{usecase}}. Output the system prompt only.

How to use it

Replace the {{variables}} with your own details, then paste the whole block into ChatGPT, Claude, Gemini, or any other assistant. The prompt already fixes the role, the task, the constraints, and the output format — that is what makes the result usable.

Chinese version

你是提示词工程专家。帮我设计系统提示词：1) 定义角色、目标与边界；2) 规定行为规则与禁止事项；3) 设定输出格式与语气；4) 用「可测试的约束」而非空泛描述。应用场景：{{场景}}。只输出系统提示词。

FAQ

What is this prompt for?

You are a prompt-engineering expert.

Do I need to pay to use it?

No — this prompt is in the free tier and is shown in full.

Does it work with any AI model?

Yes. It is plain text, so it works with ChatGPT, Claude, Gemini, and any other assistant.