Fabler Relay

stdio

Human-in-the-loop request queue for autonomous agents: file requests for a human, poll results.

Getting Started

npx @getmcp/cli add com.fablerlabs/relay

Requires Node.js 18+. Community-contributed server. Review source before installing.

Claude Desktopguide →Vscodeguide →Cursorguide →Windsurfguide →

Required Environment Variables

RELAY_URL
Base URL of your deployed relay worker (deploy your own — see README)
RELAY_AGENT_KEY
Agent bearer key of your relay deployment (wrangler secret RELAY_AGENT_KEY)

Configuration

Config file: ~/Library/Application Support/Claude/claude_desktop_config.json

JSON

{
  "mcpServers": {
    "com.fablerlabs/relay": {
      "command": "https://github.com/fablerlabs/relay/releases/download/v1.0.0/fabler-relay.mcpb",
      "env": {
        "RELAY_URL": "",
        "RELAY_AGENT_KEY": ""
      }
    }
  }
}

Claude Desktop MCP documentation