stable-browser - SKILL.md Agent Skill

name: stable-browser

description: Set up reliable browser automation using Chrome DevTools Protocol (CDP) instead of the flaky browser extension relay. Use when browser relay keeps disconnecting, throwing WebSocket 403 errors, or when you need stable headless/headed browser control for web scraping, form filling, social media posting, or any browser automation task. Replaces profile="chrome" with a rock-solid CDP connection.

Stable Browser

Replace the unreliable browser extension relay with a direct Chrome DevTools Protocol connection.

The Problem

The OpenClaw browser extension relay (profile="chrome") frequently breaks:

WebSocket 403 errors
Port confusion (gateway port vs relay port)
Dropped connections mid-automation
"Can't reach browser control service" errors
Badge/tab attachment confusion

The Fix: Chrome CDP

Launch Chrome with a debug port and connect directly. No extension needed.

Quick Setup

Run the setup script to configure everything:


bash scripts/setup-cdp.sh

This will:

Create a dedicated Chrome profile at ~/.chrome-debug-profile
Add browser.cdpUrl to your OpenClaw config
Create a LaunchAgent (macOS) so Chrome starts on login
Verify the connection works

Manual Setup

If you prefer to set things up manually, see references/manual-setup.md.

Usage

After setup, always use profile="openclaw" (not profile="chrome"):


browser(action="snapshot", profile="openclaw")

browser(action="navigate", profile="openclaw", targetUrl="https://example.com")

browser(action="screenshot", profile="openclaw")

Key Differences from Extension Relay

| Feature | Extension Relay | CDP Direct |

|---------|----------------|------------|

| Stability | Frequent disconnects | Rock solid |

| Setup | Install extension + attach tab | One-time script |

| Auth/Cookies | Shares your main Chrome | Dedicated profile |

| Speed | Extra hop through extension | Direct protocol |

| Headless | No | Optional (--headless=new) |

Dedicated Profile

The CDP browser uses ~/.chrome-debug-profile — a separate Chrome profile. This means:

Log into sites once, stays logged in
Your main Chrome is untouched
No extension conflicts
Survives Chrome updates

Tips

First run: Log into any sites you need (Google, GitHub, X, LinkedIn, etc.)
Multiple tabs: CDP manages all tabs — use targetId to pin a specific tab
Headless mode: Add --headless=new to the launch command for invisible operation
Port conflict: If port 9222 is taken, change it in both the launch command and config
Restart Chrome: pkill -f 'remote-debugging-port=9222' && sleep 1 && bash scripts/setup-cdp.sh

Troubleshooting

"Can't reach browser": Chrome isn't running with debug port. Run setup-cdp.sh or launch manually
Port 9222 in use: Another Chrome or process grabbed it. Kill it: lsof -i :9222
Stale session: Chrome crashed. Kill and restart: pkill -f chrome-debug-profile
Profile corruption: Delete ~/.chrome-debug-profile and re-run setup