Worked on the nushell/nushell repository to enhance reliability in external process management by addressing error handling in Rust-based system programming. Focused on improving the clarity of user-facing error messages when spawning child processes, particularly by implementing targeted handling for nul byte errors in run_external.rs. This approach provided explicit feedback when a nul byte was detected in input data, reducing ambiguity and aiding in faster debugging. Leveraged skills in command line interface development and error handling to refine diagnostics, ensuring users received more informative responses during process failures. The work contributed to a more robust and user-friendly command line experience.