Add guidelines for coding agents

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI coding agents working in this repository.
+
+## Repository Overview
+
+Monorepo of WordPress block themes built by the Automattic community, aimed at submission to the WordPress.org themes directory. Themes use the WordPress block editor and Full Site Editing (FSE) capabilities.
+
+**Tech stack**: PHP, JSON (theme.json), HTML (block templates), Node.js (tooling only)
+
+**Node version**: 20.10.0 (see `.nvmrc`)
+
+## Repository Structure
+
+```
+community/
+├── <theme-name>/           # Each theme is its own directory
+│   ├── style.css           # Theme metadata header + base styles (REQUIRED)
+│   ├── theme.json          # Theme config: colors, typography, spacing presets
+│   ├── functions.php       # Optional: theme setup, enqueue scripts
+│   ├── readme.txt          # Theme documentation for WordPress.org
+│   ├── screenshot.png      # Theme preview (1200x900 recommended)
+│   ├── templates/          # Full-page block templates (.html)
+│   ├── parts/              # Template parts: headers, footers (.html)
+│   ├── patterns/           # Reusable block patterns (.php)
+│   └── assets/             # Images, fonts, and other media
+├── theme-utils.mjs         # Node utility script (pattern escaping, schema validation)
+├── package.json
+└── .lintstagedrc.json      # Runs schema:validate on theme.json on commit
+```
+
+## Commands
+
+```bash
+# Install dependencies (first time)
+npm install
+
+# Escape pattern strings for i18n and update image paths (run after editing patterns)
+npm run patterns:escape
+
+# Validate all theme.json files against JSON schema
+npm run schema:validate
+```
+
+`schema:validate` runs automatically on every `git commit` via lint-staged for changed `theme.json`, `styles/*.json`, and `assets/fonts/*.json` files. If validation fails, the commit is blocked.
+
+## style.css Header — Required Fields
+
+Every theme MUST have a `style.css` with this header block:
+
+```css
+/*
+Theme Name: My Theme Name
+Theme URI: https://github.com/WordPress/community-themes/tree/trunk/my-theme-name
+Author: the WordPress team
+Author URI: https://wordpress.org/
+Description: Brief description here.
+Requires at least: 6.1
+Tested up to: 6.6
+Requires PHP: 7.4
+Version: 0.0.1
+License: GNU General Public License v2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+Template: twentytwentythree
+Text Domain: my-theme-name
+Tags: one-column, custom-colors, ...
+*/
+```
+
+- **Text Domain MUST match the theme's directory name** (e.g., directory `blue-note` → text domain `blue-note`)
+- **Template** field specifies the parent theme slug (most themes here are child themes of `twentytwentythree`)
+- **Theme Name MUST be unique** — check https://themes.svn.wordpress.org/ before naming a new theme
+
+## Pattern Development — Critical Rules
+
+Pattern files live in `patterns/` and MUST be `.php` files.
+
+### 1. File Header (required in every pattern file)
+
+```php
+<?php
+/**
+ * Title: My Pattern Name
+ * Slug: theme-slug/my-pattern-name
+ * Categories: featured, text
+ */
+```
+
+For utility/hidden patterns:
+```php
+<?php
+/**
+ * Title: 404
+ * Slug: theme-slug/hidden-404
+ * Inserter: no
+ */
+```
+
+### 2. ALL user-facing strings MUST be wrapped in i18n functions
+
+```php
+// HTML content
+<?php echo esc_html__( 'Read more', 'theme-name' ); ?>
+
+// HTML content with context
+<?php echo esc_html_x( 'Posted in', 'noun: post category label', 'theme-name' ); ?>
+
+// HTML attributes
+<img alt="<?php echo esc_attr__( 'Description', 'theme-name' ); ?>">
+
+// Content that may contain HTML tags
+<?php echo wp_kses_post( __( 'Visit our <strong>store</strong>', 'theme-name' ) ); ?>
+```
+
+The `npm run patterns:escape` script can help automate wrapping strings.
+
+### 3. Image paths MUST use dynamic template directory URI
+
+```php
+<!-- CORRECT -->
+src="<?php echo esc_url( get_template_directory_uri() ); ?>/assets/images/photo.webp"
+
+<!-- WRONG — will break on different installations -->
+src="/wp-content/themes/my-theme/assets/images/photo.webp"
+```
+
+### 4. Remove block-specific IDs from pattern markup
+
+When copying patterns from the block editor, MUST remove:
+- `"id"` from image blocks (`<!-- wp:image {"id":123} -->` → `<!-- wp:image {} -->`)
+- `"queryId"` from query blocks
+- `"theme"` attribute from template-part blocks
+
+These IDs are environment-specific and will break on other installations.
+
+### 5. Use theme presets, not hardcoded CSS values
+
+```json
+// CORRECT — use palette slug
+"textColor": "contrast"
+
+// WRONG — hardcoded value
+"style": { "color": { "text": "#000000" } }
+```
+
+Use slugs defined in the theme's `theme.json` for colors, font sizes, and spacing.
+
+### 6. Pattern file naming conventions
+
+- Regular patterns: `pattern-name.php`
+- Hidden utility patterns (404, navigation, etc.): `hidden-pattern-name.php` + `Inserter: no` header
+- Full page patterns: `page-pattern-name.php`
+
+### 7. Pattern categories
+
+| Category | Use when |
+|---|---|
+| Default WP categories | General-purpose patterns |
+| `Block Types` | Patterns tied to a specific block type |
+| `Template Types` | Patterns for 404, home, single templates |
+| `Post Types` | Patterns restricted to specific post types |
+
+## theme.json
+
+- Defines the design system: color palette, font sizes, spacing scale, typography settings
+- Changes are validated against JSON schema on commit
+- Use `"slug"` values for colors and font sizes — these become CSS custom properties
+
+Example structure:
+```json
+{
+  "version": 2,
+  "settings": {
+    "color": {
+      "palette": [
+        { "slug": "contrast", "color": "#000", "name": "Contrast" },
+        { "slug": "base", "color": "#fff", "name": "Base" }
+      ]
+    },
+    "typography": {
+      "fontSizes": [
+        { "slug": "small", "size": "0.875rem", "name": "Small" }
+      ]
+    }
+  }
+}
+```
+
+## Block Templates and Parts
+
+Templates in `templates/` and parts in `parts/` are `.html` files containing block markup.
+
+Common templates to include: `index.html`, `home.html`, `single.html`, `page.html`, `archive.html`, `404.html`, `search.html`
+
+Common parts: `header.html`, `footer.html`
+
+## Child Themes vs. Standalone Themes
+
+Most themes in this repo are **child themes of Twenty Twenty-Three**:
+- `Template: twentytwentythree` in `style.css`
+- Inherit templates, parts, and patterns from the parent
+- Override by creating files with the same name in the child theme
+
+Some may be standalone block themes (no `Template` field).
+
+## Common Pitfalls
+
+- **Don't hardcode image paths** — always use `get_template_directory_uri()`
+- **Don't leave block IDs in patterns** — remove `id`, `queryId`, and `theme` attributes
+- **Text domain must match directory name** — mismatches break i18n
+- **Don't use hardcoded hex colors** in block attributes — use palette slugs from theme.json
+- **Don't edit WordPress core files** — never modify anything outside of the theme directory
+- **Don't duplicate theme names** — check themes.svn.wordpress.org first
+- **Don't add `.xml`, `.sh`, `.sql` files** to themes — not allowed per WordPress.org guidelines (see `.gitignore`)
+- **Don't skip schema validation** — if `theme.json` changes don't validate, the commit will fail
+
+## Accessibility Requirements
+
+- Color contrast must meet WCAG 2.1 AA (4.5:1 for normal text, 3:1 for large text)
+- Images in patterns must have descriptive `alt` text
+- Font sizes must remain readable (avoid sizes below 14px for body text)
+- Interactive elements must have visible focus states
+
+## WordPress.org Submission Guidelines
+
+Themes submitted to WordPress.org must:
+- Have a unique theme name
+- Include a `readme.txt` with description, changelog, and credits
+- Have a `screenshot.png` (1200x900px)
+- Pass the Theme Check plugin requirements
+- All strings translatable
+- No calls to external services without user consent
+- GPL-compatible license for all assets
+
+## Development Environment
+
+**WordPress Playground (no local setup required)**: Use the Playground links in `README.md` to preview themes in-browser.
+
+**Local development**: Clone this repo into your WordPress install's `wp-content/themes/` directory. Each theme directory will appear as a separate theme in the admin.
+
+Recommended plugin: Create Block Theme (helps generate theme files from the editor).

CLAUDE.md

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+@AGENTS.md