System Prompt Generator

System prompts are the foundation of every AI-powered product. They define how the assistant behaves, what it knows, what it avoids, and how it communicates. A well-crafted system prompt is the difference between a chatbot that frustrates users and one that delights them.

Anatomy of a System Prompt

The best system prompts follow a consistent structure: identity (who the AI is), capabilities (what it can do), rules (what it must follow), constraints (what it must avoid), and output format (how to respond). This generator assembles all five components based on your selections.

Common Mistakes

Overloading the system prompt with too many rules causes the model to forget or deprioritize some. Being vague ("be helpful") doesn't change behavior — be specific ("always provide step-by-step instructions"). Contradictory rules ("be concise" + "provide comprehensive explanations") confuse the model. Start simple, test, and add rules only when you observe unwanted behavior.

Testing Your System Prompt

After generating a prompt, test it with edge cases: off-topic questions, adversarial inputs, ambiguous requests, and multi-turn conversations. Check that the AI stays in character, follows your rules, and handles uncertainty gracefully. The best system prompts survive real-world usage patterns, not just the happy path.