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+---
+name: chrome-devtools
+description: Browser automation, debugging, and performance analysis using Puppeteer CLI scripts. Use for automating browsers, taking screenshots, analyzing performance, monitoring network traffic, web scraping, form automation, and JavaScript debugging.
+license: Apache-2.0
+---
+
+# Chrome DevTools Agent Skill
+
+Browser automation via executable Puppeteer scripts. All scripts output JSON for easy parsing.
+
+## Quick Start
+
+**CRITICAL**: Always check `pwd` before running scripts.
+
+### Installation
+
+#### Step 1: Install System Dependencies (Linux/WSL only)
+
+On Linux/WSL, Chrome requires system libraries. Install them first:
+
+```bash
+pwd  # Should show current working directory
+cd .claude/skills/chrome-devtools/scripts
+./install-deps.sh  # Auto-detects OS and installs required libs
+```
+
+Supports: Ubuntu, Debian, Fedora, RHEL, CentOS, Arch, Manjaro
+
+**macOS/Windows**: Skip this step (dependencies bundled with Chrome)
+
+#### Step 2: Install Node Dependencies
+
+```bash
+npm install  # Installs puppeteer, debug, yargs
+```
+
+#### Step 3: Install ImageMagick (Optional, Recommended)
+
+ImageMagick enables automatic screenshot compression to keep files under 5MB:
+
+**macOS:**
+```bash
+brew install imagemagick
+```
+
+**Ubuntu/Debian/WSL:**
+```bash
+sudo apt-get install imagemagick
+```
+
+**Verify:**
+```bash
+magick -version  # or: convert -version
+```
+
+Without ImageMagick, screenshots >5MB will not be compressed (may fail to load in Gemini/Claude).
+
+### Test
+```bash
+node navigate.js --url https://example.com
+# Output: {"success": true, "url": "https://example.com", "title": "Example Domain"}
+```
+
+## Available Scripts
+
+All scripts are in `.claude/skills/chrome-devtools/scripts/`
+
+**CRITICAL**: Always check `pwd` before running scripts.
+
+### Script Usage
+- `./scripts/README.md`
+
+### Core Automation
+- `navigate.js` - Navigate to URLs
+- `screenshot.js` - Capture screenshots (full page or element)
+- `click.js` - Click elements
+- `fill.js` - Fill form fields
+- `evaluate.js` - Execute JavaScript in page context
+
+### Analysis & Monitoring
+- `snapshot.js` - Extract interactive elements with metadata
+- `console.js` - Monitor console messages/errors
+- `network.js` - Track HTTP requests/responses
+- `performance.js` - Measure Core Web Vitals + record traces
+
+## Usage Patterns
+
+### Single Command
+```bash
+pwd  # Should show current working directory
+cd .claude/skills/chrome-devtools/scripts
+node screenshot.js --url https://example.com --output ./docs/screenshots/page.png
+```
+**Important**: Always save screenshots to `./docs/screenshots` directory.
+
+### Automatic Image Compression
+Screenshots are **automatically compressed** if they exceed 5MB to ensure compatibility with Gemini API and Claude Code (which have 5MB limits). This uses ImageMagick internally:
+
+```bash
+# Default: auto-compress if >5MB
+node screenshot.js --url https://example.com --output page.png
+
+# Custom size threshold (e.g., 3MB)
+node screenshot.js --url https://example.com --output page.png --max-size 3
+
+# Disable compression
+node screenshot.js --url https://example.com --output page.png --no-compress
+```
+
+**Compression behavior:**
+- PNG: Resizes to 90% + quality 85 (or 75% + quality 70 if still too large)
+- JPEG: Quality 80 + progressive encoding (or quality 60 if still too large)
+- Other formats: Converted to JPEG with compression
+- Requires ImageMagick installed (see imagemagick skill)
+
+**Output includes compression info:**
+```json
+{
+  "success": true,
+  "output": "/path/to/page.png",
+  "compressed": true,
+  "originalSize": 8388608,
+  "size": 3145728,
+  "compressionRatio": "62.50%",
+  "url": "https://example.com"
+}
+```
+
+### Chain Commands (reuse browser)
+```bash
+# Keep browser open with --close false
+node navigate.js --url https://example.com/login --close false
+node fill.js --selector "#email" --value "user@example.com" --close false
+node fill.js --selector "#password" --value "secret" --close false
+node click.js --selector "button[type=submit]"
+```
+
+### Parse JSON Output
+```bash
+# Extract specific fields with jq
+node performance.js --url https://example.com | jq '.vitals.LCP'
+
+# Save to file
+node network.js --url https://example.com --output /tmp/requests.json
+```
+
+## Execution Protocol
+
+### Working Directory Verification
+
+BEFORE executing any script:
+1. Check current working directory with `pwd`
+2. Verify in `.claude/skills/chrome-devtools/scripts/` directory
+3. If wrong directory, `cd` to correct location
+4. Use absolute paths for all output files
+
+Example:
+```bash
+pwd  # Should show: .../chrome-devtools/scripts
+# If wrong:
+cd .claude/skills/chrome-devtools/scripts
+```
+
+### Output Validation
+
+AFTER screenshot/capture operations:
+1. Verify file created with `ls -lh <output-path>`
+2. Read screenshot using Read tool to confirm content
+3. Check JSON output for success:true
+4. Report file size and compression status
+
+Example:
+```bash
+node screenshot.js --url https://example.com --output ./docs/screenshots/page.png
+ls -lh ./docs/screenshots/page.png  # Verify file exists
+# Then use Read tool to visually inspect
+```
+
+5. Restart working directory to the project root.
+
+### Error Recovery
+
+If script fails:
+1. Check error message for selector issues
+2. Use snapshot.js to discover correct selectors
+3. Try XPath selector if CSS selector fails
+4. Verify element is visible and interactive
+
+Example:
+```bash
+# CSS selector fails
+node click.js --url https://example.com --selector ".btn-submit"
+# Error: waiting for selector ".btn-submit" failed
+
+# Discover correct selector
+node snapshot.js --url https://example.com | jq '.elements[] | select(.tagName=="BUTTON")'
+
+# Try XPath
+node click.js --url https://example.com --selector "//button[contains(text(),'Submit')]"
+```
+
+### Common Mistakes
+
+❌ Wrong working directory → output files go to wrong location
+❌ Skipping output validation → silent failures
+❌ Using complex CSS selectors without testing → selector errors
+❌ Not checking element visibility → timeout errors
+
+✅ Always verify `pwd` before running scripts
+✅ Always validate output after screenshots
+✅ Use snapshot.js to discover selectors
+✅ Test selectors with simple commands first
+
+## Common Workflows
+
+### Web Scraping
+```bash
+node evaluate.js --url https://example.com --script "
+  Array.from(document.querySelectorAll('.item')).map(el => ({
+    title: el.querySelector('h2')?.textContent,
+    link: el.querySelector('a')?.href
+  }))
+" | jq '.result'
+```
+
+### Performance Testing
+```bash
+PERF=$(node performance.js --url https://example.com)
+LCP=$(echo $PERF | jq '.vitals.LCP')
+if (( $(echo "$LCP < 2500" | bc -l) )); then
+  echo "✓ LCP passed: ${LCP}ms"
+else
+  echo "✗ LCP failed: ${LCP}ms"
+fi
+```
+
+### Form Automation
+```bash
+node fill.js --url https://example.com --selector "#search" --value "query" --close false
+node click.js --selector "button[type=submit]"
+```
+
+### Error Monitoring
+```bash
+node console.js --url https://example.com --types error,warn --duration 5000 | jq '.messageCount'
+```
+
+## Script Options
+
+All scripts support:
+- `--headless false` - Show browser window
+- `--close false` - Keep browser open for chaining
+- `--timeout 30000` - Set timeout (milliseconds)
+- `--wait-until networkidle2` - Wait strategy
+
+See `./scripts/README.md` for complete options.
+
+## Output Format
+
+All scripts output JSON to stdout:
+```json
+{
+  "success": true,
+  "url": "https://example.com",
+  ... // script-specific data
+}
+```
+
+Errors go to stderr:
+```json
+{
+  "success": false,
+  "error": "Error message"
+}
+```
+
+## Finding Elements
+
+Use `snapshot.js` to discover selectors:
+```bash
+node snapshot.js --url https://example.com | jq '.elements[] | {tagName, text, selector}'
+```
+
+## Troubleshooting
+
+### Common Errors
+
+**"Cannot find package 'puppeteer'"**
+- Run: `npm install` in the scripts directory
+
+**"error while loading shared libraries: libnss3.so"** (Linux/WSL)
+- Missing system dependencies
+- Fix: Run `./install-deps.sh` in scripts directory
+- Manual install: `sudo apt-get install -y libnss3 libnspr4 libasound2t64 libatk1.0-0 libatk-bridge2.0-0 libcups2 libdrm2 libxkbcommon0 libxcomposite1 libxdamage1 libxfixes3 libxrandr2 libgbm1`
+
+**"Failed to launch the browser process"**
+- Check system dependencies installed (Linux/WSL)
+- Verify Chrome downloaded: `ls ~/.cache/puppeteer`
+- Try: `npm rebuild` then `npm install`
+
+**Chrome not found**
+- Puppeteer auto-downloads Chrome during `npm install`
+- If failed, manually trigger: `npx puppeteer browsers install chrome`
+
+### Script Issues
+
+**Element not found**
+- Get snapshot first to find correct selector: `node snapshot.js --url <url>`
+
+**Script hangs**
+- Increase timeout: `--timeout 60000`
+- Change wait strategy: `--wait-until load` or `--wait-until domcontentloaded`
+
+**Blank screenshot**
+- Wait for page load: `--wait-until networkidle2`
+- Increase timeout: `--timeout 30000`
+
+**Permission denied on scripts**
+- Make executable: `chmod +x *.sh`
+
+**Screenshot too large (>5MB)**
+- Install ImageMagick for automatic compression
+- Manually set lower threshold: `--max-size 3`
+- Use JPEG format instead of PNG: `--format jpeg --quality 80`
+- Capture specific element instead of full page: `--selector .main-content`
+
+**Compression not working**
+- Verify ImageMagick installed: `magick -version` or `convert -version`
+- Check file was actually compressed in output JSON: `"compressed": true`
+- For very large pages, use `--selector` to capture only needed area
+
+## Reference Documentation
+
+Detailed guides available in `./references/`:
+- [CDP Domains Reference](./references/cdp-domains.md) - 47 Chrome DevTools Protocol domains
+- [Puppeteer Quick Reference](./references/puppeteer-reference.md) - Complete Puppeteer API patterns
+- [Performance Analysis Guide](./references/performance-guide.md) - Core Web Vitals optimization
+
+## Advanced Usage
+
+### Custom Scripts
+Create custom scripts using shared library:
+```javascript
+import { getBrowser, getPage, closeBrowser, outputJSON } from './lib/browser.js';
+// Your automation logic
+```
+
+### Direct CDP Access
+```javascript
+const client = await page.createCDPSession();
+await client.send('Emulation.setCPUThrottlingRate', { rate: 4 });
+```
+
+See reference documentation for advanced patterns and complete API coverage.
+
+## External Resources
+
+- [Puppeteer Documentation](https://pptr.dev/)
+- [Chrome DevTools Protocol](https://chromedevtools.github.io/devtools-protocol/)
+- [Scripts README](./scripts/README.md)