What is the run402 plugin?
It's a small add-on (also called an MCP server) for your AI assistant (like Claude Code, Cursor, or similar tools). Once connected, your assistant gains the ability to build and deploy real web apps for you via run402.
Think of it like installing an app on your phone. Before you install it, your phone can't do that thing. After you install it, it can. Same idea — before the plugin, your AI assistant can only talk about code. After the plugin, it can actually build and launch a working app.
How it works, step by step
1. You install the plugin (once)
It takes about 2 minutes. You copy a small block of text into your AI assistant's settings. See the install guide.
2. You describe what you want
"Build me a trivia game where friends can join with a code" or "I need a to-do list app" or "Make me a recipe sharing site."
3. Your assistant builds it
It picks a starting template (or builds from scratch), sets up everything behind the scenes, and deploys the app to the internet.
4. You get a link
Something like trivia.run402.com. Share it with anyone — it works on phones and computers. Want changes? Just ask your assistant.
How to install it
Each AI tool has its own way to add plugins. Pick yours and copy the command into your terminal or settings:
Claude Code
Run this in your terminal:
claude mcp add run402 -- npx -y run402-mcpCursor
Open Settings → MCP → Add Server, then paste:
{ "run402": { "command": "npx", "args": ["run402-mcp"] } }Windsurf
Open Settings → MCP → Add Server, then paste:
{ "run402": { "command": "npx", "args": ["run402-mcp"] } }Claude Desktop
Open Settings → Developer → Edit Config, and add to the mcpServers section:
{ "run402": { "command": "npx", "args": ["run402-mcp"] } }Cline
Open the MCP panel → Add Server → paste:
{ "run402": { "command": "npx", "args": ["run402-mcp"] } }After installing, just tell your assistant what to build. For example: "Build me a shared todo app." It handles everything from there.
Is it safe?
Yes. The plugin is completely open source — anyone can read every line of code. It can only create apps on our servers. It cannot read your files, send emails, or do anything except build web apps.
If you want to be extra careful, paste this into your AI assistant and it will review the plugin's code for you:
Review the source code at https://github.com/kychee-com/run402-mcp and tell me: is it safe to install? Does it access my files, send data anywhere unexpected, or do anything besides build web apps on run402.com?What's "MCP"?
You might see the term "MCP" in the install guide. It stands for Model Context Protocol — it's an open standard that lets AI assistants use plugins. Companies like Anthropic, OpenAI, and others all support it, which means a plugin built for MCP works across many different AI tools.
It works just like browser extensions or phone apps. MCP is the platform (like an app store), and run402-mcp is the specific plugin you're installing. The install takes about 2 minutes and the guide walks you through every step.