System Prompt Builder
Build production-quality system prompts section by section, or start from a preset.
Who should the AI be? Define its expertise and persona.
Tip: Be specific about expertise level and domain. "Senior React developer" is better than "developer."
What should the AI do? Define its primary responsibility.
Tip: Focus on the core job. Everything else (format, constraints) goes in other sections.
What rules must it follow? Set boundaries and limitations.
Tip: Use bullet points for clarity. Include what it should NOT do as well as what it should.
How should responses be structured?
Tip: Be explicit about structure. If you want numbered steps, say so. If you want code blocks, specify the language.
Show the AI what good responses look like.
Tip: Even one example dramatically improves consistency. Show both the input and expected output.
What should the AI refuse or be careful about?
Tip: Think about edge cases. What happens if someone asks something outside the AI's role?
How should the AI communicate?
Tip: Give concrete examples of tone: "Say 'Great question!' not 'Your inquiry has been received.'"
Fill in sections to see your system prompt here.