During February 2026, Srv enhanced Rust project discovery in the facebook/buck2 and facebook/buck2-prelude repositories, focusing on cross-compilation workflows. By extending target resolution to include transitioned and labeled sibling targets, Srv addressed failure modes that previously led to empty target universes and cquery errors. The implementation involved advanced rule-kind filtering and phase-by-phase expansion, ensuring transitioned targets and RustAnalyzerInfo propagated reliably downstream. Using Rust and Python, Srv improved build system robustness and developer experience by integrating transitioned wrappers into the discovery graph. The work demonstrated depth in build systems and cross-compilation, resulting in more deterministic and reliable Rust project configurations.