Yeachan Heo focused on stabilizing CLI user experience and runtime reliability within the oh-my-claudecode repository, addressing issues specific to terminal emulation in Node.js environments. During March 2026, he delivered a targeted bug fix that detects when the CLI is running inside a cmux terminal and bypasses tmux wrapping, enabling direct mode execution. This approach prevents the creation of orphaned tmux sessions and reduces session buildup, improving resource management in multi-terminal workflows. By implementing cleanup for failed tmux attach attempts, Yeachan enhanced both developer experience and CI reliability. His work leveraged JavaScript, TypeScript, and expertise in CLI development and testing.