During March 2026, Yeachan-Heo focused on backend development for the oh-my-claudecode repository, addressing reliability in multi-agent orchestration. He expanded the ForceInherit validation logic to include both Task and Agent tool calls, specifically targeting scenarios where complex agent interactions previously triggered invalid_parameter_error. By refining error handling and integrating robust API validation, he resolved a critical bug that had caused instability in multi-agent flows. This work, implemented in JavaScript, improved the stability of agent coordination and reduced downstream support issues. Yeachan-Heo’s contribution demonstrated depth in backend problem-solving, particularly in error handling and API integration within distributed agent systems.