RelayRailRelayRail
Documentation

Quick Start

Get up and running with RelayRail in under 5 minutes.

1. Create an Account

Sign up for a RelayRail account at relayrail.dev/signup. You'll need to verify your email and add your phone number for SMS notifications.

2. Create an Agent

From your dashboard, create a new agent. Each agent gets:

  • A unique API key
  • Its own dedicated phone number (Pro+ plans)
  • Separate activity logs

Copy the API key - you'll need it in the next step.

3. Configure Your MCP Client

Add RelayRail to your MCP configuration. The setup varies by client:

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json
{
  "mcpServers": {
    "relayrail": {
      "command": "npx",
      "args": ["@relayrail/server", "start"],
      "env": {
        "RELAYRAIL_API_KEY": "rr_your_api_key_here"
      }
    }
  }
}

Cursor

Edit ~/.cursor/mcp.json

{
  "relayrail": {
    "command": "npx",
    "args": ["@relayrail/server", "start"],
    "env": {
      "RELAYRAIL_API_KEY": "rr_your_api_key_here"
    }
  }
}

4. Test It Out

Ask your agent to send you a test notification:

"Use RelayRail to send me a test notification saying hello"

You should receive an SMS within a few seconds. Reply to confirm it works!

5. Use Approval Workflows

Now try an approval flow:

"Ask me for approval before deploying to production"

The agent will send you a request, wait for your response, and then continue based on your answer.

Next Steps