API Blueprint is a widely used format with a vast number of features and tooling available, making it easier for developers to write concise and human-friendly API description files. However, despite its popularity, API Blueprint has some common mistakes that can lead to errors in the conversion process. These include absent metadata, incorrect usage of type systems, referencing named types not defined in the data structures section, confusing attributes type definitions, rules varying for URI parameters sections, and open-ended type system issues. To utilize the full potential of API Blueprint, developers need to understand its type system, which uses Markdown syntax for object notation (MSON), but can be overwhelming due to a high learning curve. Apiary is working on improving API Blueprint in future releases, which will help reduce inconsistencies and errors in description files.