Relay MCP server

Relay MCP server

Remote Model Context Protocol server for Relay, a business phone and SMS app for teams, built in Montreal.

It lets Claude, or any MCP client, work with your team's phone: list calls and texts, read call transcripts, search and update contacts, send an SMS from the team number, and draft call-routing flows.

This repository holds no server code: the server is hosted by Relay. Nothing to install on the server side.

Get an API key

1. Create a free account at https://app.yesrelay.com.
2. In the app, open Administration, then Integrations & API, and create a key.
3. The key starts with rklive and is shown once. Keep it in a secrets manager.

Revoking the key in the app cuts MCP and REST access at the same instant.

Connect a client

Claude Code

claude mcp add --transport http relay https://api.yesrelay.com/api/mcp \
  --header "Authorization: Bearer rk_live_..."

Claude Desktop

claudedesktopconfig.json, through mcp-remote:

{
  "mcpServers": {
    "relay": {
      "command": "npx",
      "args": ["mcp-remote", "https://api.yesrelay.com/api/mcp",
               "--header", "Authorization:${AUTH}"],
      "env": { "AUTH": "Bearer rk_live_..." }
    }
  }
}

Any other client

Point it at https://api.yesrelay.com/api/mcp with the Authorization header above.

Tools

Calls and messages

Contacts and team

Flow (call routing, Business and Scale plans)

No tool publishes a flow. An agent can draft and check a call path; a person puts it live from the app.

Safeguards

A text sent through MCP goes through the same checks as a text sent from the app:

What you can do also follows your plan: sending texts needs a paid plan, and the Flow tools need Business or Scale.

Limits

Shortened. The full README is on GitHub.