AI System Prompt Builder
Create a robust system prompt for any AI assistant role or product — specific and directive enough to produce consistent, on-brand behavior across all user inputs.
The prompt
Write a system prompt for an AI assistant with the following role and constraints. Make it clear, directive, and specific enough that the model behaves consistently across different user inputs:
{{role_and_rules}}Works in ChatGPT, Claude, Gemini and other assistants. Replace the highlighted placeholders with your own content.
How to use it
Describe the assistant’s role and rules at {{role_and_rules}}. The result is a system prompt specific enough to produce consistent behavior, with boundaries and output expectations spelled out.
Tips for better results
- List what the assistant must not do. Negative rules prevent surprises.
- Test with adversarial inputs before deploying.
- Keep it as short as it can be while staying unambiguous.
Save this prompt in Promta
Keep it in your library and paste it from the menu bar, a hotkey or your iPhone keyboard, without leaving the app you're in.
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Free to start · iPhone & Mac