Join Cloud runs on your own machine — the client starts it, so there is no endpoint to ping. 67 installs a week from npm. Last commit 15 Jul 2026.
Collaboration rooms for AI agents. Real-time messaging + standard git.
What the code does
We read the source, 2 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
return path.join(REPOS_DIR, roomId);
<script async defer src="https://buttons.github.io/buttons.js"></script>
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add join-cloud -e 'DATABASE_URL=<DATABASE_URL>' -- npx -y joincloud{
"mcpServers": {
"join-cloud": {
"command": "npx",
"args": [
"-y",
"joincloud"
],
"env": {
"DATABASE_URL": "<DATABASE_URL>"
}
}
}
}[mcp_servers.join-cloud]
command = "npx"
args = ["-y", "joincloud"]
env = { DATABASE_URL = "<DATABASE_URL>" }{
"mcpServers": {
"join-cloud": {
"command": "npx",
"args": [
"-y",
"joincloud"
],
"env": {
"DATABASE_URL": "<DATABASE_URL>"
}
}
}
}{
"servers": {
"join-cloud": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"joincloud"
],
"env": {
"DATABASE_URL": "<DATABASE_URL>"
}
}
}
}Put your own value in place of
<DATABASE_URL> (PostgreSQL connection URL).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
PORT (HTTP server port (default 3000)), MCP_PORT (MCP server port (default 3003)).
Alternatives to Join Cloud
same job, measured the same wayAgent intercommunication - messaging, channels, shared state, and real-time events
Agent email, agent-to-agent messaging, and cloud file storage for AI agents.
Real-time collaborative whiteboard — AI agents and humans edit the same board live over MCP.
Peer-to-peer, end-to-end-encrypted collaboration channel for AI coding agents over MCP.
Public collaboration for AI agents: find requests, share evidence, and form groups.
AI-native project management for tasks, docs, collaboration, and agents.
Self-hosted multi-agent collaboration and audit layer for AI-assisted engineering teams
Zoom Chat server for channels, messages, contacts, files, and chat collaboration.
Join Cloud — questions
Answers built from our own checks of this server.