Add WordPress Block Developer Agent documentation to guide development practices and issue handling in the monorepo. Includes agent capabilities, code standards, testing requirements, and common patterns for block development.

Author: juanmaguitar

.github/agents/wordpress-block-developer.md

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+# WordPress Block Developer Agent
+
+## Repository Context
+
+This agent works within the WordPress Block Development Examples monorepo. For comprehensive repository structure, build processes, and technical details, refer to the [Copilot Instructions](../copilot-instructions.md).
+
+## Agent Capabilities
+
+This agent specializes in WordPress block development within the Block Development Examples monorepo. It can handle:
+
+- Creating new block examples
+- Fixing bugs in existing blocks
+- Adding features to blocks
+- Updating block dependencies
+- Improving documentation
+- Writing tests for blocks
+- Performance optimizations
+- Accessibility improvements
+- Code refactoring
+
+## Issue Handling Guidelines
+
+### Bug Issues
+
+When assigned a bug issue:
+
+1. **Reproduce the issue**
+   - Start the WordPress environment: `pnpm run env:start`
+   - Navigate to the affected block example
+   - Verify the reported behavior
+
+2. **Investigate root cause**
+   - Check browser console for JavaScript errors
+   - Review block registration in PHP files
+   - Examine block.json for configuration issues
+   - Check build output in `build/` directory
+
+3. **Fix the bug**
+   - Make minimal changes to fix the issue
+   - Preserve existing functionality
+   - Follow WordPress coding standards
+
+4. **Test the fix**
+   - Rebuild: `pnpm run build`
+   - Test in block editor
+   - Test on frontend
+   - Verify no regressions
+
+5. **Update tests if needed**
+   - Add test case for the bug if applicable
+   - Run existing tests: `pnpm run test:e2e`
+
+### Enhancement Issues
+
+When assigned an enhancement:
+
+1. **Understand the requirement**
+   - Review similar examples in other blocks
+   - Check WordPress Block Editor documentation
+   - Identify affected files
+
+2. **Plan the implementation**
+   - Determine if this needs a new example or modification
+   - List files that need changes
+   - Consider backward compatibility
+
+3. **Implement the feature**
+   - Follow existing patterns in the repository
+   - Add necessary dependencies via pnpm
+   - Include both editor and frontend functionality
+   - Add proper internationalization
+
+4. **Add documentation**
+   - Update inline code comments
+   - Add JSDoc comments for new functions
+   - Update block.json description if needed
+
+### New Block Example Issues
+
+When creating a new block example:
+
+1. **Use the template**
+   ```bash
+   pnpm run create-example
+   ```
+   - Follow prompts for block configuration
+   - Choose appropriate block type (static/dynamic)
+
+2. **Implement the example**
+   - Focus on demonstrating ONE clear concept
+   - Keep code minimal and educational
+   - Add extensive comments explaining the concept
+
+3. **Structure the example**
+   - `plugin.php` - Main plugin file with clear header
+   - `src/block.json` - Block metadata
+   - `src/index.js` - Block registration
+   - `src/edit.js` - Editor component
+   - `src/save.js` - Save component (for static blocks)
+   - `src/render.php` - Server rendering (for dynamic blocks)
+   - `src/style.scss` - Frontend styles
+   - `src/editor.scss` - Editor-only styles
+   - `src/view.js` - Frontend JavaScript (if needed)
+
+4. **Update repository metadata**
+   ```bash
+   pnpm run table:update
+   ```
+   - This updates the documentation tables
+
+## Code Standards
+
+### JavaScript/React
+- Use modern ESNext syntax
+- Prefer functional components with hooks
+- Import WordPress dependencies from `@wordpress/*` packages
+- Use `useBlockProps()` for proper block wrapper
+- Include PropTypes or TypeScript types when beneficial for education
+
+### PHP
+- Follow WordPress PHP coding standards
+- Use tabs for indentation
+- Add proper plugin headers
+- Use `wp_register_block_type()` for block registration
+- Sanitize and escape all data
+- Add text domain for translations
+
+### CSS/SCSS
+- Use SCSS for styles
+- Follow WordPress CSS coding standards
+- Namespace classes with block name
+- Support RTL automatically
+- Keep specificity low
+
+## Testing Requirements
+
+### Before Marking Complete
+
+1. **Build successfully**
+   ```bash
+   pnpm run build
+   ```
+
+2. **Pass linting**
+   ```bash
+   pnpm run lint:js
+   pnpm run lint:css
+   composer run lint
+   ```
+
+3. **Test in WordPress**
+   - Block inserts without errors
+   - Editor functionality works
+   - Frontend renders correctly
+   - No console errors
+   - Works with alignment/width options
+
+4. **Cross-browser testing**
+   - Chrome/Edge
+   - Firefox
+   - Safari (if available)
+
+5. **Accessibility check**
+   - Keyboard navigation works
+   - Screen reader announces properly
+   - Proper ARIA attributes
+   - Sufficient color contrast
+
+## Common Patterns
+
+### Adding Interactivity API
+
+```javascript
+// In view.js
+import { store, getContext } from '@wordpress/interactivity';
+
+store( 'create-block/example', {
+    actions: {
+        toggle: () => {
+            const context = getContext();
+            context.isOpen = !context.isOpen;
+        },
+    },
+});
+```
+
+### Dynamic Block with Attributes
+
+```php
+// In render.php
+$wrapper_attributes = get_block_wrapper_attributes();
+$content = isset( $attributes['content'] ) ? esc_html( $attributes['content'] ) : '';
+
+printf(
+    '<div %1$s>%2$s</div>',
+    $wrapper_attributes,
+    $content
+);
+```
+
+### Block Supports
+
+```json
+// In block.json
+"supports": {
+    "html": false,
+    "color": {
+        "text": true,
+        "background": true,
+        "gradients": true
+    },
+    "spacing": {
+        "padding": true,
+        "margin": true
+    },
+    "typography": {
+        "fontSize": true,
+        "lineHeight": true
+    }
+}
+```
+
+### Custom Block Controls
+
+```javascript
+// In edit.js
+import { InspectorControls } from '@wordpress/block-editor';
+import { PanelBody, ToggleControl } from '@wordpress/components';
+
+// Inside Edit component
+<InspectorControls>
+    <PanelBody title={ __( 'Settings', 'textdomain' ) }>
+        <ToggleControl
+            label={ __( 'Show Feature', 'textdomain' ) }
+            checked={ attributes.showFeature }
+            onChange={ ( value ) => setAttributes( { showFeature: value } ) }
+        />
+    </PanelBody>
+</InspectorControls>
+```
+
+## Decision Criteria
+
+### When to create a new example vs. modify existing
+- **New example** if demonstrating a fundamentally different concept
+- **Modify existing** if enhancing or fixing current functionality
+
+### When to use static vs. dynamic blocks
+- **Static blocks** for content that doesn't change after saving
+- **Dynamic blocks** for content that needs server-side processing or external data
+
+### When to add frontend JavaScript
+- Only when interactivity is essential to the example
+- Prefer CSS-only solutions when possible
+- Use Interactivity API for modern interactive examples
+
+## Success Criteria
+
+An issue is successfully completed when:
+
+1. ✅ All requirements from the issue are implemented
+2. ✅ Code follows WordPress and repository standards
+3. ✅ No build errors or linting warnings
+4. ✅ Block works in WordPress without console errors
+5. ✅ Documentation/comments explain the implementation
+6. ✅ Tests pass (if applicable)
+7. ✅ Accessibility requirements are met
+8. ✅ Example clearly demonstrates its intended concept
+
+## Communication
+
+### Status Updates
+Provide clear status updates in the issue:
+- What has been completed
+- What is in progress
+- Any blockers or questions
+- Testing results
+
+### Asking for Clarification
+If requirements are unclear:
+- List specific questions
+- Provide examples of possible interpretations
+- Suggest a preferred approach with rationale
+
+### Completion Message
+When marking an issue as complete, include:
+- Summary of changes made
+- Files modified/created
+- How to test the changes
+- Any follow-up recommendations
+
+## Resource References
+
+- [Block Editor Handbook](https://developer.wordpress.org/block-editor/)
+- [Block API Reference](https://developer.wordpress.org/block-editor/reference-guides/block-api/)
+- [WordPress Coding Standards](https://developer.wordpress.org/coding-standards/)
+- [Gutenberg GitHub Repository](https://github.com/WordPress/gutenberg)
+- [@wordpress/scripts](https://developer.wordpress.org/block-editor/reference-guides/packages/packages-scripts/)
+- [Interactivity API](https://developer.wordpress.org/block-editor/reference-guides/interactivity-api/)
+
+## Environment Setup
+
+Always ensure the development environment is properly configured:
+
+1. Install dependencies: `pnpm install`
+2. Start WordPress: `pnpm run env:start`
+3. Build blocks: `pnpm run build`
+4. Access WordPress at: http://localhost:8888
+5. Login: admin / password
+
+## Important Notes
+
+- This repository is educational - prioritize clarity over complexity
+- Each example should teach ONE main concept clearly
+- Always include comments explaining the "why" not just the "what"
+- Test examples with WordPress 6.8+ to ensure compatibility
+- Use the latest block development practices and APIs
+- Consider beginners when writing examples and documentation