System Prompt Design — Build Your AI Application Foundation

I will design a comprehensive system prompt for your AI application — covering persona definition, capability and limitation declaration, behavioural guidelines, topic boundary enforcement, output format specification, and safety constraints — creating the foundation that determines your AI's character and behaviour across every interaction. The system prompt is the most consequential single piece of text in any AI application — it establishes the AI's identity, what it will and won't do, and how it behaves across the entire user interaction space; a poorly designed system prompt produces an AI that feels inconsistent, exceeds its intended scope, or fails on edge cases in ways that damage user trust.

The design covers persona and role specification, capability declaration, explicit and implicit limitation handling, topic boundary constraints, output format guidelines, safety constraints, and testing across intended use cases and adversarial inputs.