Tom enhanced the multisite admin workflow in the google/site-kit-wp repository by implementing multi-admin access and robust admin state handling using PHP and WordPress back end development. He restored the skip sign-in button for multisite admins, addressing scenarios involving multiple administrators on subsites, and refined the admin counting logic to reduce ambiguity and edge-case issues. Tom also refactored the transient store from an integer to a boolean to clarify the has_multiple_admins state, improving maintainability and reliability of admin dashboards. His work focused on reducing onboarding friction for subsite admins and supporting more seamless cross-site collaboration within multisite environments.