0n3
MCP servers · Xero · MCP server

Connect Codex CLI to Xero

One line gives Codex CLI your Xero account as tools: 9 endpoints, invoices, contacts, payments, called with your own connection. No key in the prompt, a receipt for every call, revoke Codex CLI's access alone any time.

Get the line for Codex CLIConnect Xero first

Three steps

  1. Create a free 0n3 account and connect Xero. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into Codex CLI. OpenAI's terminal agent reads 0n3 over Streamable HTTP with a token from your environment.
  3. Ask Codex CLI: whoami. Then: "List invoices in Xero".
Put the token in your environment
export ON3_TOKEN="<your 0n token>"

Add it to your shell profile so Codex finds it next time.

The line above carries a placeholder; 0n3.app/install mints a real key named for Codex CLI and fills it in.

What Codex CLI can then do in Xero

Invoices · Manage invoices3
List invoicesGET /Invoices
Create an invoicePOST /Invoices
Get an invoiceGET /Invoices/{InvoiceID}
Contacts · Manage accounting contacts2
List contactsGET /Contacts
Create a contactPOST /Contacts
Payments · Record payments2
List paymentsGET /Payments
Create a paymentPUT /Payments
More · Everything else this app exposes.2
List accountsGET /Accounts
Get an organisationGET /Organisation

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Codex CLI with other apps

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