During April 2025, Wenkan Chen focused on stabilizing inference workflows in the menloresearch/verl-deepresearch repository by addressing error handling in Python. He improved reliability when using Megatron and Hugging Face inference together by implementing explicit guards that raise a NotImplementedError, preventing ambiguous runtime behavior. Wenkan also resolved an UnboundLocalError by ensuring proper initialization and handling of the rollout variable across different inference paths. His work emphasized defensive programming and careful debugging, reducing production risk from crashes in multi-inference configurations. Through git-based collaboration and clear commit traceability, Wenkan enhanced maintainability and developer clarity in complex error-prone code paths.