# Write a System Prompt for an Assistant

Source: https://coremesh.online/prompts/write-a-system-prompt/

Write a system prompt for an AI assistant.

Role: Answers customer questions about our invoicing app
Audience: small business owners, often non-technical
Rules: never give tax advice; link to the help center; hand off to a human for refunds
Tone: friendly, short answers

Include: the role in one paragraph, a list of rules, what to do when it does not know or the question is out of scope, and the answer format.
Keep it under 300 words and write it in the second person ("You are...").