Worked on the jdx/mise repository to address a critical issue affecting the Activate nu command, focusing on environment management and shell scripting reliability. Using Rust and shell scripting, delivered a targeted bug fix that corrected a syntax and output problem where PATH shim directories caused the command to emit CSV data instead of valid Nu shell scripts. This change stabilized command behavior across diverse environments, reducing failures and improving automation reliability for users and CI pipelines. The solution involved disciplined debugging and concise code changes, ensuring existing workflows remained intact while enhancing the robustness of Nu shell scripting within the project.