atc-mcp-connector

A thin stdio bridge for the ATC account-intelligence MCP server.

It lets stdio-only MCP clients (Claude Desktop, Cursor, Windsurf, etc.) connect to the remote ATC endpoint over HTTPS. This package is intentionally a launcher only — it contains no tools, prompts, or server logic. Everything proprietary stays on ATC's servers; this just forwards the client's stdio transport to the remote endpoint.

Quick start (npx — no install)

npx -y atc-mcp-connector

Client configuration

Most clients accept a JSON config block. Point them at this package:

{
  "mcpServers": {
    "atc": {
      "command": "npx",
      "args": ["-y", "atc-mcp-connector"]
    }
  }
}

That's the whole setup for OAuth servers — on first run a browser window opens to authorize, and the token is cached locally for future sessions.

Authentication

The bridge supports two modes:

OAuth (default). If the ATC server advertises OAuth, leave everything unset. The bridge runs the browser authorization flow automatically and caches credentials.

Static token. If you issue API tokens instead, supply one via environment variable and it's sent as an Authorization: Bearer header:

{
  "mcpServers": {
    "atc": {
      "command": "npx",
      "args": ["-y", "atc-mcp-connector"],
      "env": {
        "ATC_MCP_TOKEN": "your-token-here"
      }
    }
  }
}

Configuration reference

| Variable | Default | Purpose | | --------------- | ---------------------------------- | ---------------------------------------------------- | | ATC_MCP_URL | https://mcp.atc-analytics.com/mcp| Override the remote endpoint (e.g. staging vs prod). | | ATC_MCP_TOKEN | (unset) | Static bearer token; omit to use OAuth. |

Extra flags are passed straight through to the underlying bridge, e.g.:

npx -y atc-mcp-connector --transport sse-only

How it works

This package wraps mcp-remote, the de-facto stdio↔HTTP/SSE bridge. Your MCP client speaks stdio to this process; this process forwards every message to the remote ATC server and streams responses back. No request is ever served locally.

Requirements

• Node.js >= 18

License

MIT