Worked on the zed-industries/gemini-cli repository to address a critical data integrity issue in the EditTool by implementing concurrency protection. The solution introduced checks for concurrent modifications, including tracking the last-edit timestamp and comparing it with the file’s modification time to ensure that human edits are not inadvertently overwritten. This approach respects external changes and enhances collaboration reliability by preventing clobbering of manual edits during simultaneous access. The work was carried out using TypeScript and full stack development skills, with a focus on robust testing to validate the fix and maintain the stability of the codebase throughout the update process.