This article provides a comprehensive playbook for creating a strong business case to invest in a developer tool. The author emphasizes the importance of understanding the "why" behind the investment and researching vendors thoroughly before engaging with them. Key steps include identifying technical requirements, shortlisting vendors, testing use cases, building a business case, and finally enjoying the benefits of the chosen tool. The article also highlights the significance of end-user adoption and collaboration across cross-functional stakeholders in the decision-making process.