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skills/chrome-devtools/scripts/README.md

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+# Chrome DevTools Scripts
+
+CLI scripts for browser automation using Puppeteer.
+
+**CRITICAL**: Always check `pwd` before running scripts.
+
+## Installation
+
+### Quick Install
+
+```bash
+pwd  # Should show current working directory
+cd .claude/skills/chrome-devtools/scripts
+./install.sh  # Auto-checks dependencies and installs
+```
+
+### Manual Installation
+
+**Linux/WSL** - Install system dependencies first:
+```bash
+./install-deps.sh  # Auto-detects OS (Ubuntu, Debian, Fedora, etc.)
+```
+
+Or manually:
+```bash
+sudo apt-get install -y libnss3 libnspr4 libasound2t64 libatk1.0-0 libatk-bridge2.0-0 libcups2 libdrm2 libxkbcommon0 libxcomposite1 libxdamage1 libxfixes3 libxrandr2 libgbm1
+```
+
+**All platforms** - Install Node dependencies:
+```bash
+npm install
+```
+
+## Scripts
+
+**CRITICAL**: Always check `pwd` before running scripts.
+
+### navigate.js
+Navigate to a URL.
+
+```bash
+node navigate.js --url https://example.com [--wait-until networkidle2] [--timeout 30000]
+```
+
+### screenshot.js
+Take a screenshot with automatic compression.
+
+**Important**: Always save screenshots to `./docs/screenshots` directory.
+
+```bash
+node screenshot.js --output screenshot.png [--url https://example.com] [--full-page true] [--selector .element] [--max-size 5] [--no-compress]
+```
+
+**Automatic Compression**: Screenshots >5MB are automatically compressed using ImageMagick to ensure compatibility with Gemini API and Claude Code. Install ImageMagick for this feature:
+- macOS: `brew install imagemagick`
+- Linux: `sudo apt-get install imagemagick`
+
+Options:
+- `--max-size N` - Custom size threshold in MB (default: 5)
+- `--no-compress` - Disable automatic compression
+- `--format png|jpeg` - Output format (default: png)
+- `--quality N` - JPEG quality 0-100 (default: auto)
+
+### click.js
+Click an element.
+
+```bash
+node click.js --selector ".button" [--url https://example.com] [--wait-for ".result"]
+```
+
+### fill.js
+Fill form fields.
+
+```bash
+node fill.js --selector "#input" --value "text" [--url https://example.com] [--clear true]
+```
+
+### evaluate.js
+Execute JavaScript in page context.
+
+```bash
+node evaluate.js --script "document.title" [--url https://example.com]
+```
+
+### snapshot.js
+Get DOM snapshot with interactive elements.
+
+```bash
+node snapshot.js [--url https://example.com] [--output snapshot.json]
+```
+
+### console.js
+Monitor console messages.
+
+```bash
+node console.js --url https://example.com [--types error,warn] [--duration 5000]
+```
+
+### network.js
+Monitor network requests.
+
+```bash
+node network.js --url https://example.com [--types xhr,fetch] [--output requests.json]
+```
+
+### performance.js
+Measure performance metrics and record trace.
+
+```bash
+node performance.js --url https://example.com [--trace trace.json] [--metrics] [--resources true]
+```
+
+## Common Options
+
+- `--headless false` - Show browser window
+- `--close false` - Keep browser open
+- `--timeout 30000` - Set timeout in milliseconds
+- `--wait-until networkidle2` - Wait strategy (load, domcontentloaded, networkidle0, networkidle2)
+
+## Selector Support
+
+Scripts that accept `--selector` (click.js, fill.js, screenshot.js) support both **CSS** and **XPath** selectors.
+
+### CSS Selectors (Default)
+
+```bash
+# Element tag
+node click.js --selector "button" --url https://example.com
+
+# Class selector
+node click.js --selector ".btn-submit" --url https://example.com
+
+# ID selector
+node fill.js --selector "#email" --value "user@example.com" --url https://example.com
+
+# Attribute selector
+node click.js --selector 'button[type="submit"]' --url https://example.com
+
+# Complex selector
+node screenshot.js --selector "div.container > button.btn-primary" --output btn.png
+```
+
+### XPath Selectors
+
+XPath selectors start with `/` or `(//` and are automatically detected:
+
+```bash
+# Text matching - exact
+node click.js --selector '//button[text()="Submit"]' --url https://example.com
+
+# Text matching - contains
+node click.js --selector '//button[contains(text(),"Submit")]' --url https://example.com
+
+# Attribute matching
+node fill.js --selector '//input[@type="email"]' --value "user@example.com"
+
+# Multiple conditions
+node click.js --selector '//button[@type="submit" and contains(text(),"Save")]'
+
+# Descendant selection
+node screenshot.js --selector '//div[@class="modal"]//button[@class="close"]' --output modal.png
+
+# Nth element
+node click.js --selector '(//button)[2]'  # Second button on page
+```
+
+### Discovering Selectors
+
+Use `snapshot.js` to discover correct selectors:
+
+```bash
+# Get all interactive elements
+node snapshot.js --url https://example.com | jq '.elements[]'
+
+# Find buttons
+node snapshot.js --url https://example.com | jq '.elements[] | select(.tagName=="BUTTON")'
+
+# Find inputs
+node snapshot.js --url https://example.com | jq '.elements[] | select(.tagName=="INPUT")'
+```
+
+### Security
+
+XPath selectors are validated to prevent injection attacks. The following patterns are blocked:
+- `javascript:`
+- `<script`
+- `onerror=`, `onload=`, `onclick=`
+- `eval(`, `Function(`, `constructor(`
+
+Selectors exceeding 1000 characters are rejected (DoS prevention).
+
+## Output Format
+
+All scripts output JSON to stdout:
+
+```json
+{
+  "success": true,
+  "url": "https://example.com",
+  "title": "Example Domain",
+  ...
+}
+```
+
+Errors are output to stderr:
+
+```json
+{
+  "success": false,
+  "error": "Error message",
+  "stack": "..."
+}
+```