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Getting startedStarter kits for the site: file structure, available kits, list, preview and apply with nucleo/kit-apply.EditorNucleo menus, admin pages, document editor, settings, content model and Pro license in the WordPress backend, with permissions and limits.AI agentsConnect Claude and other MCP clients to your WordPress site with Nucleo: server URL, OAuth authorization and permissions.Design systemToken groups, validation, CSS variables, local fonts and the abilities that read and change a Nucleo site's design tokens.Layouts and sectionsHow Nucleo compiles documents on save, when it rebuilds them, and what data the frontend runtime uses for layouts and sections.Quality and SEOQuality checks for Nucleo documents: rules, severity, scores, publish blocking, site scan and SEO tags.PerformanceLoad CSS and JS on the front end, audit assets, reduce third-party CSS, generate critical CSS and optimize from the Performance screen.ReferenceJSON structure of the document, validation, error codes, migrations, manifests and the 41 nc/* blocks of Nucleo.