The Phoenix prompt management system is a holistic tool designed to preserve developer freedom and promote reproducibility in LLM applications. It addresses the challenges of traditional software development by providing features such as dataset curation, experimentation, and tracking prompt changes. The system prioritizes LLM reproducibility and flexibility, allowing developers to use their preferred libraries and frameworks without being limited by vendor-specific tools or proxies. By embracing a vendor-agnostic approach, Phoenix enables developers to manage prompts in the exact format needed for their LLMs, promoting incremental adoption and ensuring that prompt management is done with the user's trust and consent.