Worked on stabilizing the agent mode workflow in the sst/opencode repository, focusing on preserving user-selected variants during agent mode transitions. Addressed a critical bug where switching modes would unintentionally reset the application's thinking level, which previously disrupted ongoing reasoning flows and increased user confusion. The solution involved careful debugging and regression prevention, ensuring that the selected variant state persisted reliably across mode changes. This improvement enhanced the reliability and user experience of the agent-mode logic in production. The work was implemented using React and TypeScript, with a strong emphasis on front end development best practices and thorough testing.