Worked on stabilizing macOS launchd domain handling within the nix-community/home-manager repository, focusing on improving reliability during agent boot-out and domain transitions. Addressed a bug where the 'Domain does not support specified action' error could cause false warnings or failures, particularly in headless macOS deployments. Used Nix and Shell Scripting to implement a fix that treats this error as harmless, ensuring smoother agent management and reducing noise in continuous integration workflows. Added automated tests to verify correct behavior when domains are absent, and maintained code clarity by documenting the rationale for handling domain-not-exist scenarios in the boot-out process.