- Use music/favorites/add_item with URI format for adding - Use music/favorites/remove_item with media_type and library_item_id for removing - Find actual provider from provider_mappings for adding (not "library") - Extract numeric library_item_id for removal operations 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>