fieldtwin

io.github.nickgeorgeseo/fieldtwin · v0.5.3

Local, stateful twins of the Jobber, Housecall Pro, and QuickBooks Online APIs, for agents and tests

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add fieldtwin -e FIELDTWIN_PORT=<FIELDTWIN_PORT> -e FIELDTWIN_HOST=<FIELDTWIN_HOST> -e FIELDTWIN_AUTH=<FIELDTWIN_AUTH> -e FIELDTWIN_SEED=<FIELDTWIN_SEED> -- npx -y [email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "fieldtwin": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FIELDTWIN_PORT": "<FIELDTWIN_PORT>",
        "FIELDTWIN_HOST": "<FIELDTWIN_HOST>",
        "FIELDTWIN_AUTH": "<FIELDTWIN_AUTH>",
        "FIELDTWIN_SEED": "<FIELDTWIN_SEED>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "fieldtwin": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FIELDTWIN_PORT": "<FIELDTWIN_PORT>",
        "FIELDTWIN_HOST": "<FIELDTWIN_HOST>",
        "FIELDTWIN_AUTH": "<FIELDTWIN_AUTH>",
        "FIELDTWIN_SEED": "<FIELDTWIN_SEED>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "fieldtwin": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FIELDTWIN_PORT": "<FIELDTWIN_PORT>",
        "FIELDTWIN_HOST": "<FIELDTWIN_HOST>",
        "FIELDTWIN_AUTH": "<FIELDTWIN_AUTH>",
        "FIELDTWIN_SEED": "<FIELDTWIN_SEED>"
      }
    }
  }
}

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
`FIELDTWIN_PORT` Optional	The port the twin listens on. The MCP server starts a twin of its own, so pick another port if one already runs on 4010.
`FIELDTWIN_HOST` Optional	The address the twin listens on. Keep the loopback address unless something else must reach the twin.
`FIELDTWIN_AUTH` Optional	any-token accepts any Bearer token; oauth accepts only tokens from the twin's OAuth endpoints.
`FIELDTWIN_SEED` Optional	Which fake business to generate: the same seed builds the same world.

Details

Package	`[email protected]` (NPM, stdio)
First published	29 Oct 2026
Last updated	29 Oct 2026
Registry name	`io.github.nickgeorgeseo/fieldtwin`

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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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