Worked on enhancing test and benchmark command customization in both the Wilfred/rust-analyzer and rust-lang/rust repositories, focusing on improving configuration management and command line tooling. Developed and integrated new placeholders for overrideCommand, such as ${exact} and ${include_ignored}, enabling more precise test selection and flexible benchmark execution. Refined the CargoTargetSpec logic to ensure correct generation of CLI options, which improved reproducibility and consistency across repositories. All changes were implemented in Rust, with careful attention to software development best practices and thorough testing. The work resulted in improved cross-repo parity and reduced CI flakiness, supporting maintainable and traceable workflows.