Jean Ibarz developed multi-file attachment support for task messages in the CLI tools of both the a2aproject/a2a-samples and google/A2A repositories. Using Python, he implemented a loop-based input system to collect multiple file paths, encoding and appending each file to the outgoing message. His approach emphasized robust error handling, addressing scenarios such as missing files and read errors to ensure reliability. By standardizing this feature across repositories, Jean improved usability and consistency for end users collaborating on tasks. His work demonstrated depth in CLI development, file handling, and error management, resulting in a more seamless document attachment workflow.