feat: add webapp-testing skill from official Claude Code templates

Add Playwright-based web application testing skill to both repository directories. This skill provides toolkit for testing local web applications with support for frontend verification, UI debugging, browser screenshots, and console log viewing.

Includes:
- SKILL.md with comprehensive testing guidance and decision trees
- Helper script (scripts/with_server.py) for server lifecycle management
- Example automation scripts for common testing patterns
- Support for both static HTML and dynamic web application testing

The skill will be included when running create-rule.js due to explicit skills folder handling added previously.

Author: stevengonsalvez

claude-code-4.5/skills/webapp-testing/LICENSE.txt

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claude-code-4.5/skills/webapp-testing/SKILL.md

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+---
+name: webapp-testing
+description: Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.
+license: Complete terms in LICENSE.txt
+---
+
+# Web Application Testing
+
+To test local web applications, write native Python Playwright scripts.
+
+**Helper Scripts Available**:
+- `scripts/with_server.py` - Manages server lifecycle (supports multiple servers)
+
+**Always run scripts with `--help` first** to see usage. DO NOT read the source until you try running the script first and find that a customized solution is abslutely necessary. These scripts can be very large and thus pollute your context window. They exist to be called directly as black-box scripts rather than ingested into your context window.
+
+## Decision Tree: Choosing Your Approach
+
+```
+User task → Is it static HTML?
+    ├─ Yes → Read HTML file directly to identify selectors
+    │         ├─ Success → Write Playwright script using selectors
+    │         └─ Fails/Incomplete → Treat as dynamic (below)
+    │
+    └─ No (dynamic webapp) → Is the server already running?
+        ├─ No → Run: python scripts/with_server.py --help
+        │        Then use the helper + write simplified Playwright script
+        │
+        └─ Yes → Reconnaissance-then-action:
+            1. Navigate and wait for networkidle
+            2. Take screenshot or inspect DOM
+            3. Identify selectors from rendered state
+            4. Execute actions with discovered selectors
+```
+
+## Example: Using with_server.py
+
+To start a server, run `--help` first, then use the helper:
+
+**Single server:**
+```bash
+python scripts/with_server.py --server "npm run dev" --port 5173 -- python your_automation.py
+```
+
+**Multiple servers (e.g., backend + frontend):**
+```bash
+python scripts/with_server.py \
+  --server "cd backend && python server.py" --port 3000 \
+  --server "cd frontend && npm run dev" --port 5173 \
+  -- python your_automation.py
+```
+
+To create an automation script, include only Playwright logic (servers are managed automatically):
+```python
+from playwright.sync_api import sync_playwright
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True) # Always launch chromium in headless mode
+    page = browser.new_page()
+    page.goto('http://localhost:5173') # Server already running and ready
+    page.wait_for_load_state('networkidle') # CRITICAL: Wait for JS to execute
+    # ... your automation logic
+    browser.close()
+```
+
+## Reconnaissance-Then-Action Pattern
+
+1. **Inspect rendered DOM**:
+   ```python
+   page.screenshot(path='/tmp/inspect.png', full_page=True)
+   content = page.content()
+   page.locator('button').all()
+   ```
+
+2. **Identify selectors** from inspection results
+
+3. **Execute actions** using discovered selectors
+
+## Common Pitfall
+
+❌ **Don't** inspect the DOM before waiting for `networkidle` on dynamic apps
+✅ **Do** wait for `page.wait_for_load_state('networkidle')` before inspection
+
+## Best Practices
+
+- **Use bundled scripts as black boxes** - To accomplish a task, consider whether one of the scripts available in `scripts/` can help. These scripts handle common, complex workflows reliably without cluttering the context window. Use `--help` to see usage, then invoke directly. 
+- Use `sync_playwright()` for synchronous scripts
+- Always close the browser when done
+- Use descriptive selectors: `text=`, `role=`, CSS selectors, or IDs
+- Add appropriate waits: `page.wait_for_selector()` or `page.wait_for_timeout()`
+
+## Reference Files
+
+- **examples/** - Examples showing common patterns:
+  - `element_discovery.py` - Discovering buttons, links, and inputs on a page
+  - `static_html_automation.py` - Using file:// URLs for local HTML
+  - `console_logging.py` - Capturing console logs during automation

claude-code-4.5/skills/webapp-testing/examples/console_logging.py

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+from playwright.sync_api import sync_playwright
+
+# Example: Capturing console logs during browser automation
+
+url = 'http://localhost:5173'  # Replace with your URL
+
+console_logs = []
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True)
+    page = browser.new_page(viewport={'width': 1920, 'height': 1080})
+
+    # Set up console log capture
+    def handle_console_message(msg):
+        console_logs.append(f"[{msg.type}] {msg.text}")
+        print(f"Console: [{msg.type}] {msg.text}")
+
+    page.on("console", handle_console_message)
+
+    # Navigate to page
+    page.goto(url)
+    page.wait_for_load_state('networkidle')
+
+    # Interact with the page (triggers console logs)
+    page.click('text=Dashboard')
+    page.wait_for_timeout(1000)
+
+    browser.close()
+
+# Save console logs to file
+with open('/mnt/user-data/outputs/console.log', 'w') as f:
+    f.write('\n'.join(console_logs))
+
+print(f"\nCaptured {len(console_logs)} console messages")
+print(f"Logs saved to: /mnt/user-data/outputs/console.log")

claude-code-4.5/skills/webapp-testing/examples/element_discovery.py

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+from playwright.sync_api import sync_playwright
+
+# Example: Discovering buttons and other elements on a page
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True)
+    page = browser.new_page()
+
+    # Navigate to page and wait for it to fully load
+    page.goto('http://localhost:5173')
+    page.wait_for_load_state('networkidle')
+
+    # Discover all buttons on the page
+    buttons = page.locator('button').all()
+    print(f"Found {len(buttons)} buttons:")
+    for i, button in enumerate(buttons):
+        text = button.inner_text() if button.is_visible() else "[hidden]"
+        print(f"  [{i}] {text}")
+
+    # Discover links
+    links = page.locator('a[href]').all()
+    print(f"\nFound {len(links)} links:")
+    for link in links[:5]:  # Show first 5
+        text = link.inner_text().strip()
+        href = link.get_attribute('href')
+        print(f"  - {text} -> {href}")
+
+    # Discover input fields
+    inputs = page.locator('input, textarea, select').all()
+    print(f"\nFound {len(inputs)} input fields:")
+    for input_elem in inputs:
+        name = input_elem.get_attribute('name') or input_elem.get_attribute('id') or "[unnamed]"
+        input_type = input_elem.get_attribute('type') or 'text'
+        print(f"  - {name} ({input_type})")
+
+    # Take screenshot for visual reference
+    page.screenshot(path='/tmp/page_discovery.png', full_page=True)
+    print("\nScreenshot saved to /tmp/page_discovery.png")
+
+    browser.close()