Athanasios Kirmizis developed a new collection of Refaster rules for the PicnicSupermarket/error-prone-support repository, targeting the simplification of common AssertJ stream operations such as filter, anyMatch, and noneMatch. He approached the task through code analysis and Java refactoring, focusing on reducing boilerplate and improving code readability. To ensure the reliability of these rules, he expanded the test suite and validated the changes to prevent regressions. His work leveraged skills in Java, testing, and code analysis, resulting in a targeted feature that enhances code quality and supports developer productivity in error-prone-assisted workflows within the repository.