Edgar developed a recursive sub-reactors feature for the ash-project/reactor repository, enhancing the Reactor DSL’s ability to support self-referential and modular reaction patterns. He introduced a new recurse function in Elixir, enabling reactors to call themselves iteratively within the DSL. This addition required careful application of software design patterns to ensure reliability and maintainability, and Edgar provided comprehensive documentation and tests to validate recursive behavior and edge cases. His work deepened the expressiveness of the Reactor DSL, reducing boilerplate for complex workflows. The feature was delivered as a single, well-structured commit, reflecting a focused and thoughtful engineering approach.