Scribo

Scribo MCP Server

Free, AI-native e-invoicing — for any MCP client.

Contents

• What is Scribo?
• What is the Scribo MCP server?
  • Demo
• Getting started
  • Quickstart
  • Setup & prerequisites
• Usage
  • How it works
  • Examples
• Compliance
• FAQ
• Resources
• License

What is Scribo?

Scribo is a free, conversational e-invoicing tool. Describe an invoice in plain language — "bill Acme GmbH €2,400 for May design work" — and it drafts a structured invoice for you to review, download and send directly.

Just ask your AI agent about Scribo: it ships as an MCP server, a CLI, and a Claude/Codex skill, alongside a public HTTP API and a web app. Free forever — no credit card. You just need a sender email.

Built by Causa Prima — Scribo is built by Causa Prima, a company building agentic AI for the CFO office. It's our first freely available skill — an early glimpse of what we're building.

What is the Scribo MCP server?

The Scribo MCP server gives your AI assistant the ability to create invoices for you. It's a hosted Model Context Protocol endpoint — add its URL to your assistant once, then just ask for an invoice and it gathers the details and hands back a finished, compliant invoice in the chat, ready to download and send.

Because it's hosted, there's nothing to install or run locally. It works with any MCP-aware client — Claude Desktop, Claude.ai, Cursor, Cline, ChatGPT App, the OpenAI Codex CLI, and others. Free, no signup — your email is all you need.

Demo

https://github.com/user-attachments/assets/3e1fcca8-580b-448f-bb1c-bee5ee016b54

Getting started

Quickstart

Scribo's MCP server is hosted — there's nothing to install. Point your client at:

https://scribo.causaprima.ai/mcp

In Claude Desktop or Claude.ai: Customize → Connectors → Add custom connector, name it Scribo, paste the URL, and save. Then just ask:

Draft an invoice for 3 days of consulting at €1,200/day to Acme GmbH.

Scribo collects the missing details, verifies your sender email once, and returns a download link.

Using a different client? See the per-client setup below.

Setup & prerequisites

The server speaks MCP over Streamable HTTP (JSON-RPC 2.0, MCP spec ≥ 2025-03-26) with no auth. Any MCP-aware client connects with one setting — the URL https://scribo.causaprima.ai/mcp.

Claude Desktop / Claude.ai — Customize → Connectors → Add custom connector → name Scribo, paste the URL. On Team/Enterprise plans an org owner may need to add it once under Organization settings → Connectors.

Cursor — add to ~/.cursor/mcp.json (or workspace .cursor/mcp.json):

{ "mcpServers": { "scribo": { "url": "https://scribo.causaprima.ai/mcp" } } }

Cline — add to cline_mcp_settings.json:

{ "mcpServers": { "scribo": { "transport": "streamable-http", "url": "https://scribo.causaprima.ai/mcp" } } }

OpenAI Codex CLI — add to ~/.codex/config.toml, then restart Codex:

[mcp_servers.scribo]
url = "https://scribo.causaprima.ai/mcp"

Any other MCP client — configure a remote server at the URL above, transport Streamable HTTP, no auth.

Prefer a plain-bash setup with no connector in the loop? The Scribo skill covers Claude Code, Claude.ai, Claude Desktop, and Codex via simple helper scripts.

Verify. Ask your assistant: "list the jurisdictions Scribo supports."

Usage

How it works

You describe the invoice in plain language; your assistant calls Scribo's tools to build it. The server exposes four tools:

A typical flow: you ask for an invoice → your assistant calls create_invoice and collects anything missing → on your first invoice from a new sender email, Scribo asks you to paste a 6-digit code (confirmed via verify_email_code) → your assistant retries and hands back a download link — a PDF with the matching EN 16931 XML embedded. On clients that render widgets (e.g. the ChatGPT App), the invoice appears as a card with a download button.

The server also registers five workflow prompts (generate_invoice, german_b2b_invoice, german_b2g_xrechnung, us_plain_pdf_invoice, redownload_invoice) — clients that surface prompts show them as slash-command-style starters.

Full tool schemas and sample payloads are in schemas/ and examples/, and in the MCP docs.

Examples

Things you can say to your assistant once Scribo is connected:

German B2B invoice (ZUGFeRD)

Invoice Beispiel GmbH for 12 hours of web development at €110/hour, 19% VAT. I'm Example GmbH, VAT ID DE123456789.

Returns a ZUGFeRD invoice — a PDF a human can read, with EN 16931 XML embedded for the recipient's accounting system.

German public-sector invoice (XRechnung)

Same client, but it's for the City of Munich — the Leitweg-ID is 04011000-1234512345-06.

A Leitweg-ID tells Scribo this is a B2G invoice, so it produces XRechnung, the format German public authorities require.

US invoice (plain PDF)

Bill Acme Inc. $4,000 for a brand strategy workshop.

A clean PDF invoice — no e-invoice XML, since the US has no e-invoicing mandate.

Re-download a past invoice

Send me the download link for the invoice I made for Beispiel GmbH last week.

Scribo returns a fresh download link for an invoice you've already generated.

Compliance

Scribo emits invoices conforming to EN 16931, the European e-invoicing standard, with the relevant national CIUS. Every EN 16931 output (ZUGFeRD, XRechnung) is validated against the Invopop-hosted validator at generate-time — output that fails the rule set never reaches the user. US plain PDFs carry no EN 16931 XML and are rendered directly.

Supported formats

Disclaimer: Scribo generates and validates compliant invoice documents. It is not tax or legal advice — Scribo does not determine your tax obligations, VAT treatment, or filing requirements.

FAQ

Resources

• Web app — scribo.causaprima.ai
• Documentation — scribo.causaprima.ai/docs
• Compliance & trust — scribo.causaprima.ai/compliance
• Causa Prima — causaprima.ai

Other Scribo surfaces

• Skill (Claude / Codex) — scribo-skill · docs
• MCP server — scribo-mcp · docs
• CLI — scribo-cli · docs
• HTTP API — scribo-api-docs · docs
• Brand hub — scribo

License

Proprietary — UNLICENSED. © Causa Prima Germany GmbH. All rights reserved. Distributed for use against the public Scribo API; not open-source. See LICENSE.