Cadence

com.cadencercs/cadence · v0.3.1

Send RCS messages from your agent and get typed replies. Automatic SMS fallback.

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add cadence -e CADENCE_API_KEY=<CADENCE_API_KEY> -e CADENCE_ALLOW_IRREVERSIBLE=<CADENCE_ALLOW_IRREVERSIBLE> -e CADENCE_API_URL=<CADENCE_API_URL> -- npx -y @cadencercs/[email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "cadence": {
      "command": "npx",
      "args": [
        "-y",
        "@cadencercs/[email protected]"
      ],
      "env": {
        "CADENCE_API_KEY": "<CADENCE_API_KEY>",
        "CADENCE_ALLOW_IRREVERSIBLE": "<CADENCE_ALLOW_IRREVERSIBLE>",
        "CADENCE_API_URL": "<CADENCE_API_URL>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "cadence": {
      "command": "npx",
      "args": [
        "-y",
        "@cadencercs/[email protected]"
      ],
      "env": {
        "CADENCE_API_KEY": "<CADENCE_API_KEY>",
        "CADENCE_ALLOW_IRREVERSIBLE": "<CADENCE_ALLOW_IRREVERSIBLE>",
        "CADENCE_API_URL": "<CADENCE_API_URL>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "cadence": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cadencercs/[email protected]"
      ],
      "env": {
        "CADENCE_API_KEY": "<CADENCE_API_KEY>",
        "CADENCE_ALLOW_IRREVERSIBLE": "<CADENCE_ALLOW_IRREVERSIBLE>",
        "CADENCE_API_URL": "<CADENCE_API_URL>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`CADENCE_API_KEY` Required, secret	Your Cadence API key. A sandbox key (sk_sandbox_…) simulates delivery end to end and reaches no handset; a live key sends real messages. Get one free at https://cadencercs.com/app.html — no card, no compliance wait.
`CADENCE_ALLOW_IRREVERSIBLE` Optional	Set to 1 to expose the three one-way-door tools: sync_google, request_verification and request_launch. They create an agent at Google that can never be deleted, and freeze the launch questionnaire. Left unset they are absent from tools/list entirely, so no model in this configuration can reach them.
`CADENCE_API_URL` Optional	Override the API host. Defaults to https://api.cadencercs.com.

Details

Package	`@cadencercs/[email protected]` (NPM, stdio)
First published	25 Aug 2026
Last updated	25 Aug 2026
Registry name	`com.cadencercs/cadence`

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Live status

Local install

Installed and run on your own machine, so there is no public endpoint to check.

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