wmux: Electron Terminal Multiplexer for Windows with Browser Control via MCP

What wmux Does

wmux is an open-source Electron terminal multiplexer built specifically for Windows 10/11 to address limitations when using AI coding agents. The developer created it after hitting walls with Claude Code on Windows, where there's no tmux, no way to run multiple agents side by side, and Claude couldn't interact with a browser.

Core Features

The tool includes a built-in browser that Claude Code controls directly via Chrome DevTools Protocol. What Claude can do through wmux:

• Open a browser and navigate to any URL
• Read page structure, click elements, fill forms
• Type text (works with React inputs, CJK, controlled components)
• Take screenshots
• Execute JavaScript
• Read/write to multiple terminals simultaneously

Setup and Integration

wmux registers as an MCP server automatically — just launch wmux and Claude Code picks it up. Installation is via npm: npm install -g u/wong2kim/wmux.

Example Workflow

The developer provides this example flow:

> Me: "Search Google for wmux"
> Claude: browser_open → browser_snapshot → browser_fill(ref=13, "wmux") → browser_press_key("Enter")
> → Actually searches Google. No joke.

Multi-Agent Support

Each Claude Code session gets its own browser via surfaceId. You can run three agents in three panes, each with their own browser.

Additional Functionality

• Split panes (Ctrl+D), workspaces, multiview
• Smart notifications when agents finish
• Dangerous action detection (git push --force, rm -rf, etc.)
• Session persistence — survives restart
• Security: token auth, SSRF protection, input sanitization

Technical Details

wmux is free, MIT licensed, and Windows 10/11 only. It was inspired by cmux (macOS). The GitHub repository is at https://github.com/openwong2kim/wmux.