LetsWork

Real-time collaborative coding via Claude Code — two developers, one codebase, each using their own Claude subscription.

One developer hosts the session. The other joins from anywhere. Both get a live Claude Code window connected to the same project — with file locking and an approval system to prevent conflicts.

How It Works

1. Host runs letswork start inside their project folder

2. A secure HTTPS tunnel is created automatically via Cloudflare

3. A one-time URL + guest token is generated and printed

4. Host shares the join command with the guest

5. Guest runs letswork join <url> --token <token> on their machine

6. Both developers now have Claude Code connected to the same codebase

Related MCP server: Blackboard MCP

Requirements

macOS — Host Setup

The host is the developer who owns the project. You start the session and share the join command.

Step 1 — Install dependencies

brew install cloudflared
pip install letswork

Step 2 — Install Claude Code

npm install -g @anthropic-ai/claude-code

Step 3 — Start the session

Navigate to your project folder and run:

cd /path/to/your/project
letswork start

You will be asked for your display name, then a session box appears:

╔══════════════════════════════════════════════════════════════════════╗
║  🤝 LetsWork Session Active                                          ║
║                                                                      ║
║  Send this command to your collaborator:                             ║
║  letswork join https://abc123.trycloudflare.com --token a1b2c3d4    ║
║                                                                      ║
║  Press Ctrl+C to stop.                                               ║
╚══════════════════════════════════════════════════════════════════════╝

Copy the full letswork join ... command and send it to your collaborator.

Two new terminal windows open automatically:

• Claude Code — already connected to LetsWork

• A chat window to communicate with your collaborator

Step 4 — Approve guest changes

When the guest edits a file, you'll see a notification in Claude Code. Ask Claude:

get_pending_changes

Then approve or reject:

approve_change <id>
reject_change <id>

Step 5 — Stop the session

Press Ctrl+C in the terminal where you ran letswork start.

macOS — Guest Setup

The guest connects to the host's project. You need the join command from the host.

Step 1 — Install dependencies

brew install cloudflared
pip install letswork

Step 2 — Install Claude Code

npm install -g @anthropic-ai/claude-code

Step 3 — Join the session

Run the command the host sent you:

letswork join https://abc123.trycloudflare.com --token a1b2c3d4

You'll be asked for your display name. Then two windows open:

• Claude Code — connected to the host's project

• A chat window to communicate with the host

Step 4 — Edit files

Ask Claude to read and edit files normally. When you write a file, it goes into an approval queue — the host reviews it before it's written to disk. You'll get a notification when it's approved or rejected.

Windows — Guest Setup (WSL)

LetsWork runs inside WSL (Windows Subsystem for Linux). The guest experience is the same as macOS once WSL is set up.

Step 1 — Enable WSL and install Ubuntu

Open PowerShell as Administrator and run:

wsl --install

Restart your computer when prompted. Ubuntu will install automatically.

Open Ubuntu from the Start menu and set up your Linux username and password.

Step 2 — Install dependencies inside Ubuntu

Open Ubuntu and run these one by one:

# Update packages
sudo apt update && sudo apt upgrade -y

# Install Python
sudo apt install python3 python3-pip -y

# Install Node.js and npm
sudo apt install nodejs npm -y

# Install cloudflared
curl -L https://github.com/cloudflare/cloudflared/releases/latest/download/cloudflared-linux-amd64 -o cloudflared
chmod +x cloudflared
sudo mv cloudflared /usr/local/bin/

# Install letswork
pip3 install letswork

Step 3 — Install Claude Code inside Ubuntu

npm install -g @anthropic-ai/claude-code

Step 4 — Join the session

Run the command the host sent you, inside Ubuntu:

letswork join https://abc123.trycloudflare.com --token a1b2c3d4

You'll be asked for your display name. Claude Code launches directly in the same terminal window.

Note for Windows users: Claude Code runs in the WSL terminal — not as a separate window. Everything else works identically to macOS.

MCP Tools Available

Both host and guest have access to these tools inside Claude Code:

Approval Flow

Guest file writes do not go directly to disk — they go through the host's approval queue:

1. Guest asks Claude to edit a file → write_file submits the change

2. Host sees: 📝 guest submitted change to server.py (ID: a1b2c3)

3. Host asks Claude: get_pending_changes — sees a full diff

4. Host approves: approve_change a1b2c3 → file is written to disk

5. Or rejects: reject_change a1b2c3 → guest is notified

Security

• Random Cloudflare subdomain — URL is unguessable

• Cryptographic token — second auth layer on top of the URL

• All traffic encrypted via HTTPS

• Path traversal prevention — guest cannot access files outside the project root

• File locks auto-expire after 30 minutes

• No accounts, no signup, no persistent credentials — session ends when host stops

Constraints

• Maximum 2 users per session (Host + 1 Guest)

• Text files only — binary files not supported

• 1MB file size limit per read/write operation

• Guest has no shell access — file operations only

• cloudflared must be installed on the host machine (guest does not need it on macOS, but WSL guests do)

CLI Reference

letswork start [--port PORT] [--debug]   # Start a session (default port: 8000)
letswork join <URL> --token <TOKEN>      # Join a session as guest

Architecture

Host Machine:
[Project Files] ← [MCP Server :8000] ← [Cloudflare Tunnel] ← HTTPS URL
                                                                    ↑
                                             Guest connects here
                                             via stdio proxy + secret token

The guest connects through a stdio proxy rather than directly over HTTP — this avoids Cloudflare SSE reliability issues and gives stable MCP connectivity.

License

MIT — see LICENSE

Built with the Model Context Protocol.