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Xero MCP Server (Vercel)

by TheEdgeMarina
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Xero MCP server (Vercel version)

This lets Claude write to Xero directly (invoices, contacts, payments, bills, and more).

It reuses the official Xero MCP server code (https://github.com/XeroAPI/xero-mcp-server) for all the Xero logic. The only new part is api/mcp.ts, which exposes it as a live web address instead of a local-only tool.

What you need

  • A GitHub account (free)

  • Your existing Vercel account

  • A Xero Custom Connection (Client ID + Secret)

Related MCP server: Corben MCP Server

Setup, step by step

1. Create a Xero Custom Connection

  1. Go to https://developer.xero.com/app/manage

  2. Click "New app"

  3. Choose "Custom Connection"

  4. Pick the organisation: Savili Maiava and Darryl Scott Pty Ltd

  5. Copy the Client ID and Client Secret somewhere safe

2. Push this code to GitHub

  1. Create a new, empty repo on GitHub (e.g. xero-mcp-vercel)

  2. Do NOT add a README when creating it (this folder already has one)

  3. Follow GitHub's "push an existing folder" instructions with this folder

3. Import into Vercel as a NEW project

  1. In Vercel, click "Add New" → "Project"

  2. Import the xero-mcp-vercel GitHub repo

  3. This creates a separate project from theedgemarina-website

4. Add environment variables in Vercel

Before deploying (or right after, then redeploy), add these three, under Project Settings → Environment Variables:

  • XERO_CLIENT_ID — from step 1

  • XERO_CLIENT_SECRET — from step 1

  • MCP_ACCESS_KEY — make up any long random password yourself

5. Deploy

Click Deploy. Vercel gives you a URL like:

https://xero-mcp-vercel.vercel.app

6. Add to Claude as a custom connector

Your connector URL is:

https://xero-mcp-vercel.vercel.app/api/mcp?key=YOUR_MCP_ACCESS_KEY

(replace with your real domain and the password from step 4)

Add that under Claude Settings → Connectors → Add custom connector.

7. Test it

Ask Claude to list your Xero contacts, then try creating a test contact. Check it appears in Xero.

Security notes

  • Nobody can use this URL without the password in it. Keep it secret.

  • The Custom Connection only reaches the one Xero organisation you picked in step 1.

  • No database is used or needed — tokens are fetched fresh from Xero on every request.

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

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Resources

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