fieldtwin

io.github.nickgeorgeseo/fieldtwin

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

View repository →Homepage →

Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "fieldtwin": {
      "command": "npx",
      "args": [
        "-y",
        "fieldtwin@0.5.3"
      ],
      "env": {
        "FIELDTWIN_PORT": "4010",
        "FIELDTWIN_HOST": "127.0.0.1",
        "FIELDTWIN_AUTH": "any-token",
        "FIELDTWIN_SEED": "42"
      }
    }
  }
}
Environment variables
  • FIELDTWIN_PORTThe 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_HOSTThe address the twin listens on. Keep the loopback address unless something else must reach the twin.
  • FIELDTWIN_AUTHany-token accepts any Bearer token; oauth accepts only tokens from the twin's OAuth endpoints.
  • FIELDTWIN_SEEDWhich fake business to generate: the same seed builds the same world.

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.5.3
Registry
active
Published
10/29/2026

More Developer Tools servers

Browse all Developer Tools →

mcp-gatehouse

nickgeorgeseo

Permission tiers, approval gates, and audit logging for MCP servers - the server is the gatekeeper

Developer ToolsAdded 1 week ago

io.github.nickjazz/product-lock-mcp

nickjazz

Product Lock tools for AI agents: generate, review, validate, and score locks.

Developer ToolsAdded 8 months ago

AI Footprint

nickjlamb

Water and energy footprint of AI use: chat prompts, agent sessions, methodology and sources.

Developer ToolsAdded 4 weeks ago

io.github.nickjlamb/groundwork

nickjlamb

Deployment-readiness checks for document-QA and extraction AI: grounding, extraction, CI gate.

Developer ToolsAdded 1 month ago

io.github.nickjlamb/opengate-mcp

nickjlamb

Check whether an AI answer is grounded in its context — deterministic, no LLM judge.

Developer ToolsAdded 4 months ago

io.github.nickjlamb/pubcrawl

nickjlamb

PubMed & Europe PMC literature search, US/UK drug labelling, and clinical trials for AI assistants.

Developer ToolsAdded 1 week ago

Add the badge to your site

Show visitors that fieldtwin is listed here — it’s also the link we check for a free listing.

fieldtwin — listed on Serverdex

HTML — for your website

<a href="https://serverdex.io/server/io-github-nickgeorgeseo-fieldtwin?utm_source=badge"><img src="https://serverdex.io/brand/badge.svg" alt="fieldtwin — listed on Serverdex" width="123" height="40" loading="lazy"></a>

Recommended. A dofollow link from your own domain is the one that counts for search engines, and it's the link we check for a free listing.

Markdown — for your README

[![fieldtwin — listed on Serverdex](https://serverdex.io/brand/badge.svg)](https://serverdex.io/server/io-github-nickgeorgeseo-fieldtwin?utm_source=badge)

Nice for visibility, but GitHub marks README links nofollow, so it doesn't pass authority. Use the HTML badge on your site as well.