Manual Setup

Need an API key first? Go to console.smallest.ai → API Keys → Create API Key.

Install

curl
npm

Zero dependencies — no Node.js, no npm.

Mac / Linux
Windows (PowerShell)

curl -fsSL https://raw.githubusercontent.com/smallest-inc/mcp-server/main/install.sh | bash

irm https://raw.githubusercontent.com/smallest-inc/mcp-server/main/install.ps1 | iex

It prompts for your API key and writes the config for both Cursor and Claude Desktop automatically.Skip to Restart your editor below.

Requires Node.js 18+ installed on your machine.

Open the MCP config file for your editor:

Cursor
Claude Desktop

OS	Path
Mac / Linux	`~/.cursor/mcp.json`
Windows	`%USERPROFILE%\.cursor\mcp.json`

If the file doesn’t exist, create it.

Open Claude Desktop → Settings (gear icon) → Developer → Edit ConfigOr open the file manually:

OS	Path
Mac	`~/Library/Application Support/Claude/claude_desktop_config.json`
Windows	`%APPDATA%\Claude\claude_desktop_config.json`

Paste this config. If you already have other MCP servers, just add the "atoms" entry inside "mcpServers".

{
  "mcpServers": {
    "atoms": {
      "command": "npx",
      "args": ["-y", "@developer-smallestai/atoms-mcp-server"],
      "env": {
        "ATOMS_API_KEY": "sk_your_api_key_here"
      }
    }
  }
}

Replace sk_your_api_key_here with your actual API key.

Don’t share your API key or commit it to git.

Restart your editor

Cursor
Claude Desktop

Cmd+Shift+P (Mac) or Ctrl+Shift+P (Windows) → Developer: Reload Window

Verify

Cursor
Claude Desktop

Go to Cursor Settings → MCP. You should see atoms listed with a green dot.Open a new chat (make sure you’re in Agent mode, not Ask mode) and type:

List all my agents

Start a new conversation and type:

List all my agents

You should see your Atoms agents listed back. If you do — you’re done!

Next steps

Head to the Prompt Cookbook — it has copy-paste prompts for everything you can do.

Getting Started

Using the MCP

Help

Install

Restart your editor

Verify

Next steps

Getting Started

Using the MCP

Help

​Install

​Restart your editor

​Verify

​Next steps

Install

Restart your editor

Verify

Next steps