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bg-mcp-shell-server

MCP server for running long-running processes in PTY with real-time output streaming

✨ Features

• ✅ Real-time output streaming - Live terminal output
• ✅ Interactive processes - Send input to running processes
• ✅ Multiple sessions - Control multiple processes simultaneously
• ✅ Buffered output - Full output history preserved
• ✅ PTY emulation - True terminal experience

👥 Perfect for

• 🚀 Dev servers (Vite, webpack, Next.js)
• 🔄 Watch modes (nodemon, jest --watch)
• 🐳 Docker/Docker Compose
• 🧪 Long-running tests
• 💬 Interactive CLI tools

🤖 Use cases prompts

[ You ] " Run web dev server , check for errors , and fix . "

[ You ] " Run playwright tests and monitor for errors . "

[ You ] " Build and deploy to Cloudflare . "

[ You ] " Start docker-compose and tell me when postgres is ready . "

[ You ] " Tell me what processes are running . "

[ You ] " Restart processes . "

📊 Comparison

| Creator | Long-running processes | Output in response | Interaction | Best for | |-|-|-|-|-| | bg | ✅ Yes | ✅ Buffer + terminal | ✅ writeInput | Dev servers, watch modes | | tumf | ❌ Hangs | ✅ Yes | ✅ Yes | ls, cat, grep, git status | | hdresearch | ❌ Hangs | ✅ Yes | ✅ Yes | Basic commands | | run_command | ⚠️ Blocking/Async | ⚠️ Partial | ❌ No | Standard commands with user approval |

🚀 Quick Start

Installation

npm install -g bg-server-mcp-shell

Configuration

Add to your MCP client config (e.g., Claude Desktop, Cline):

{
  "mcpServers": {
    "shell": {
      "command": "npx",
      "args": ["-y", "bg-server-mcp-shell@latest"],
      "env": {
        "COLOR": "false"
      }
    }
  }
}

🛠️ Functions

Quick command (wait for completion): startProcessAndWait Run command and wait for completion

echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"startProcessAndWait","arguments":{"cmd":"echo","args":["Hello"],"timeoutMs":5000}}}' | npx bg-server-mcp-shell

Start a background process: startProcessBackground Start long-running process in background

echo '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"startProcessBackground","arguments":{"cmd":"npm","args":["run","dev"]}}}' | npx bg-server-mcp-shell

List sessions: listSessions List all active sessions

echo '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"listSessions","arguments":{}}}' | npx bg-server-mcp-shell

Get output: getSessionOutput Read buffered output from session

echo '{"jsonrpc":"2.0","id":4,"method":"tools/call","params":{"name":"getSessionOutput","arguments":{"sessionId":"<id>"}}}' | npx bg-server-mcp-shell

Send input: writeInput Send input to running process

echo '{"jsonrpc":"2.0","id":5,"method":"tools/call","params":{"name":"writeInput","arguments":{"sessionId":"<id>","data":"rs\n"}}}' | npx bg-server-mcp-shell

Stop process: stopProcess Stop a running session

echo '{"jsonrpc":"2.0","id":6,"method":"tools/call","params":{"name":"stopProcess","arguments":{"sessionId":"<id>"}}}' | npx bg-server-mcp-shell

Cleanup finished sessions: cleanupSessions Remove finished sessions from memory

# Cleanup specific session
echo '{"jsonrpc":"2.0","id":7,"method":"tools/call","params":{"name":"cleanupSessions","arguments":{"sessionId":"<id>"}}}' | npx bg-server-mcp-shell

# Or cleanup all finished sessions
echo '{"jsonrpc":"2.0","id":8,"method":"tools/call","params":{"name":"cleanupSessions","arguments":{}}}' | npx bg-server-mcp-shell

🧪 Development

Full documentation: See Tests Documentation for complete testing guide, coverage, and API reference.

📦 Technical Details

• Framework: MCP (Model Context Protocol) MCP Protocol Spec
• Test Runner: Node.js native test runner (node:test)
• PTY: node-pty for terminal emulation node-pty Documentation
• Node: 18+ required Node.js Test Runner
• Platform: macOS, Linux, Windows

🤝 Contributing

Contributions welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Add tests for new features
4. Ensure all tests pass: npm test
5. Submit a pull request

🐛 Issues & Bug Reports

Found a bug or have a feature request? Please report it on GitHub:

Report an Issue

📄 License

MIT © Bruno Garret