As AI becomes increasingly integral to software development, crafting effective system prompts has emerged as a crucial skill for developers, particularly those integrating AI into applications. CircleCI's extensive experience with AI prompt iteration tools like Circlet has highlighted several strategies that distinguish successful AI implementations. Key approaches include adopting a multi-perspective approach that considers the end user, AI model, and system architecture; focusing on outcomes rather than just instructions; building layered context with defined functionality and constraints; and including explicit validation criteria. Consistent terminology, implementing guardrails and fallbacks, and approaching system prompting as an iterative process are also essential. These strategies aim to create AI-powered features that provide substantial value to end users by ensuring robust, reliable performance even when faced with unexpected inputs or outputs.