Turn a simple sentence into a robust System Instruction for GPT-4, Claude, or Gemini.
A System Prompt (or System Instruction) is the initial directive given to an AI. It sets the behavior, personality, and constraints *before* the user asks a question. It is the most powerful lever for controlling LLM output.
Separating a task into role, context, and output format can make instructions easier to review. This tool builds a fixed template; it does not test the prompt or verify a model's answer.
You can adapt the template for different models. Its effectiveness depends on the task and model, so compare the results with your original prompt rather than assuming an improvement.
Build a structured prompt from a task, role, and tone.