What characteristic of a design first approach will help make an API successful?

A design-first approach focuses on creating an API with user requirements and specifications prioritized before actual development work begins. By developing a specification for consumer testing prior to implementation, you ensure that the API meets the needs and expectations of its intended users. This practice encourages thorough validation of the API design against real-world use cases, allowing for adjustments based on consumer feedback before any code is written.

This proactive approach reduces the risk of building a product that does not fulfill the users' needs and enhances the overall quality and acceptance of the API. When the specification is well-documented and validated early, the development process can proceed with clearer objectives and expectations, ultimately leading to a more successful API that aligns better with user requirements.

In contrast, developing a user manual post-implementation does not address the needs of the users until after the API is already in use. Utilizing agile development methodologies emphasizes flexibility and iterative behavior, but it doesn't necessarily ensure that the design aligns with user specifications from the outset. Frequent client meetings to gather feedback are valuable, but they are more effective when grounded in a solid initial specification, which the design-first approach facilitates.