wp-multisite

Use when building or adapting a WordPress plugin for Multisite/Network — network activation (register_activation_hook with $network_wide), network admin pages (network_admin_menu), per-site vs network-wide options (get_option / get_network_option / update_network_option), looping sites with get_sites() + switch_to_blog() / restore_current_blog(), super admin capabilities (is_super_admin(), manage_network, is_network_admin()), table prefix handling ($wpdb->prefix vs $wpdb->base_prefix), blog ID awareness (get_current_blog_id), or detecting multisite context (is_multisite(), is_plugin_active_for_network()). Triggers: "make my plugin multisite compatible", "network activate", "network admin page", "per-site settings", "switch_to_blog()", "restore_current_blog()", "super admin only feature", "why does my plugin break on multisite", "run this for every site in the network", "network-wide option", "plugin only on certain sites", "blog ID handling", "is_multisite()", "is_network_admin()", "is_plugin_active_for_network()", "get_network_option()", "wpdb base_prefix", "manage_network capability", "network options page", "multisite table prefix", "site-aware hook registration", "get_sites() loop". Not for: WP-CLI multisite ops; MU-plugins auto-load behaviour (no activation hooks fire).