InvoiceForge

E-invoicing for AI agents: generate, validate and read EN 16931 and Peppol BIS Billing 3.0 e-invoices, in UBL and CII.

CommunityOnlineAPI key requiredGlobalFreeRead-only

What it can do

  • Generate Invoice: Turns invoice data into a compliant UBL 2.1 XML document following the EN 16931 semantic model, with totals and the VAT breakdown computed for you. Choose the plain EN 16931 profile
  • Validate Invoice: Checks invoice data against a documented subset of the EN 16931 business rules: mandatory fields, code lists, VAT category consistency and the arithmetic that most often gets invoice
  • Extract Invoice: Reads an incoming UBL or CII (Factur-X) invoice XML and returns the data as structured JSON, listing any field the document did not contain rather than guessing it. Use it to ingest s

What data it sees

Do you need an account

An API key from the service settings is required

E-invoicing for AI agents: generate, validate and read EN 16931 and Peppol BIS Billing 3.0 e-invoices, in UBL and CII. Validation reports every rule violation with its rule identifier and a fix. It checks the rules it lists and does not transmit invoices; it is not an accredited e-invoicing platform. Billed per call from prepaid credits; 100 free credits, no card: https://agenttoolworks.com/signup

How to connect

How to connect InvoiceForge to Claude

The server address to paste into Claude settings:

https://invoiceforge--agenttoolworks.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect InvoiceForge to ChatGPT

The server address to paste into ChatGPT settings:

https://invoiceforge--agenttoolworks.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect InvoiceForge to Cursor

The server address to paste into Cursor settings:

https://invoiceforge--agenttoolworks.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (5)

Raw names from tools/list. Only developers need these.

generate_invoiceTurns invoice data into a compliant UBL 2.1 XML document following the EN 16931 semantic model, with totals and the VAT breakdown computed for you. Choose the plain EN 16931 profile or the Peppol BIS Billing 3.0 customization. The document is validated before it is returned, so you never get back XML that would be rejected. Costs 1 credit.
validate_invoiceChecks invoice data against a documented subset of the EN 16931 business rules: mandatory fields, code lists, VAT category consistency and the arithmetic that most often gets invoices rejected. Accepts incomplete or malformed data on purpose, since that is what you want checked, and answers with each violation, its rule identifier and its business term, plus exactly which rules were checked. It never claims full compliance with the norm. Costs 1 credit.
extract_invoiceReads an incoming UBL or CII (Factur-X) invoice XML and returns the data as structured JSON, listing any field the document did not contain rather than guessing it. Use it to ingest supplier invoices before booking them. Costs 1 credit.
describe_coverageReturns the exact EN 16931 rules this server checks, the syntaxes it can produce and read, and the things it deliberately does not do, such as transmitting invoices over Peppol or acting as a French accredited platform. Light read: costs 0.2 credit.
get_usageReturns your current plan, remaining credit balance and call volume over the last 30 days. Free to call.