In this study, we introduce a new approach to addressing the complexities of health systems challenges, which we name the Ecology of Design Briefs. This approach offers a structured framework for delivering key leverage points within these challenges and creating a conceptual space for feasible design opportunities. Acknowledging the limited reach of individual design solutions in tackling the complexities of health systems challenges, our approach draws on the ecology concept of Transition Design. The utilisation of the Ecology of Design Briefs results in a collection of interconnected specification documents for design projects that guide the creative process, working together synergistically to tackle the complexities. This approach was applied to enhance hospital care experiences for individuals with acute exacerbations of chronic obstructive pulmonary disease (COPD). Hospitalisations for this group frequently lead to multidimensional negative experiences, and addressing these issues is closely linked to resolving underlying health systems problems. Our findings suggest that the developed briefs provide comprehensive, mutually reinforcing, and detailed insights necessary for understanding these challenges. This study contributes to health systems problem-solving by conceptualising the Ecology of Design Briefs as an approach and documenting its application in a hospital care setting.