This skill automates the creation of custom Gutenberg blocks for WordPress sites. It uses @wordpress/create-block as the scaffolding tool, generating proper block.json metadata files with apiVersion 3 compliance. Each block includes InspectorControls for sidebar settings panels, BlockControls for toolbar customization, and useBlockProps for proper wrapper element handling. The agent configures server-side rendering via register_block_type() with render_callback functions for dynamic content. It sets up the build pipeline using @wordpress/scripts with wp-scripts build and wp-scripts start commands. Block attributes are defined with proper types, defaults, and source configurations. The skill handles block variations, patterns, and block styles. It integrates with the WordPress theme.json system for consistent spacing, colors, and typography tokens. Includes unit test scaffolding using @wordpress/jest-preset-default.