Scribo

io.github.causa-prima-ai由 GitHub 帳號 causa-prima-ai 發布v1.0.0更新於 Oct 25, 2026

EN 16931-compliant e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS, Facturae or US PDF. Free.

已驗證Streamable HTTP可網頁執行金融商業與電商

概覽

AI 產生的概覽

Scribo 是託管式 MCP 端點，讓助理依自然語言描述起草、產生並重新下載合規的電子發票。

可以做什麼
依寄件方、收件方與明細項目建立發票並回傳下載連結；德國寄件方取得 EN 16931 格式（XRechnung 或 ZUGFeRD），美國寄件方取得一般 PDF，其他司法管轄區會被拒絕。當某個寄件信箱的首張發票需要驗證時，以 6 位數驗證碼確認該信箱的所有權。依發票 ID 取得先前產生的發票，並回傳新的簽章下載連結。列出支援的司法管轄區、可用格式與預設格式。
適用情境
適合讓助理把一段工作描述變成成品發票文件，尤其是德國 B2B 或公部門電子發票格式，或簡單的美國 PDF 發票，也適合之後重新取回已產生的發票。
執行需求
在支援 MCP 的用戶端加入遠端 Streamable HTTP 端點，無需在本機安裝。未宣告身分驗證。需要一個寄件信箱地址，新地址的首張發票需輸入寄送至該信箱的 6 位數驗證碼。需要能連線至該託管服務的網路。
安裝前請注意
發票資訊（包括寄件方與收件方名稱、地址、營業稅編號與金額）會傳送給第三方託管服務。某個寄件信箱的首張發票會觸發電子郵件驗證碼。產生的發票僅為文件，不構成稅務或法律建議。目前僅支援德國與美國。

安裝

在 SourceWeft 中

  1. 開啟 儀表板中的 Scribo，將其新增到工作區。
  2. 為需要使用其工具的對話啟用該服務。

Web executable，透過 Streamable HTTP。 遠端服務在工作區中設定後即可從網頁執行環境執行。

交給代理程式安裝

把這段提示詞貼上到 Claude Code、Codex、Cursor 等代理程式，或 SourceWeft 對話中。代理程式會讀取該伺服器的安裝指南，先向你展示發布者、端點和登入方式，經你同意後再把它新增到你的客戶端。金鑰不會寫進任何命令。

閱讀 https://sourceweft.com/mcp/io.github.causa-prima-ai%2Fscribo/install.md，並按其中說明把這個 MCP 伺服器接入我的客戶端。修改任何設定之前，先告訴我它的發布者、端點和登入方式，等我確認。不要把 API 金鑰寫進命令或我會提交的檔案；問我金鑰應從哪裡取得。

檢視代理程式所依據的安裝指南

其他 MCP 客戶端

把它新增到你客戶端的 mcpServers 設定中。

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

README

[A3 _ MCP server]

Scribo MCP Server

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

Contents

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):

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

Cline — add to cline_mcp_settings.json:

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

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

toml
[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:

ToolWhat it does
create_invoiceGenerates a compliant invoice from the sender, recipient, and line-item details, and returns a durable download link.
verify_email_codeConfirms ownership of the sender email using the 6-digit code Scribo emails on the first invoice.
get_invoiceRe-fetches a previously generated invoice and a fresh download link.
list_supported_jurisdictionsLists which countries and formats are available.

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

JurisdictionFormatStatus
Germany (B2B)ZUGFeRD COMFORT (PDF/A-3 hybrid + CII XML)✅ Live
Germany (B2G)XRechnung (UBL / CII)✅ Live
United StatesPlain PDF (no XML, no e-invoice claim)✅ Live
FranceFactur-X EN 16931🔜 Coming soon
SpainFacturae🔜 Coming soon
Belgium / NL / LU / ATPeppol BIS 3.0 UBL🔜 Coming soon

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

Is Scribo really free?

Yes — free forever. No credit card, no subscription, no paywall before your first invoice. You just need a sender email.

Do I need an account or signup?

No signup form. On your first invoice, Scribo verifies the sender email — a 6-digit code (or one-click link) arrives at that address; one verification covers ~30 minutes of invoicing. The same email doubles as your magic-link login for re-downloads later.

Which countries and formats are supported?

Live today: Germany — ZUGFeRD (B2B) and XRechnung (B2G) — and the United States (plain PDF). Coming next: France (Factur-X), Spain (Facturae), and Belgium / NL / LU / AT (Peppol BIS 3.0).

What does "EN 16931-compliant" actually mean here?

Every EN 16931 output (ZUGFeRD, XRechnung) is validated against the EN 16931-1:2017 rule set (via the Invopop-hosted validator) before it's returned. Output that fails validation never reaches you. US plain PDFs carry no EN 16931 XML, so no schematron validation applies.

Is the US version compliant?

Yes. There is no US e-invoicing mandate, so Scribo produces a fully compliant plain PDF.

Does Scribo give tax or legal advice?

No. Scribo generates and validates compliant invoice documents. It does not determine your tax obligations, VAT treatment, or filing requirements.

How do AI agents / LLMs use Scribo?

Scribo is built to be operated by an agent. It ships as an MCP server, a CLI, and a Claude/Codex skill, plus a public HTTP API and a web app — all on the same backend. An agent can discover Scribo, create an invoice, and return the file on a user's behalf.

Who builds Scribo?

Causa Prima — a company building agentic AI for the CFO office. Operated by Causa Prima Germany GmbH, Munich.

Resources

Other Scribo surfaces

License

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

來源：README.md，提交 a17a560

工具

4

create_invoice

Generate Invoice

Generate an invoice. **Phase 1 supports Germany (DE) and the United States (US) only** — DE emits an EN 16931-compliant XRechnung (UBL by default, CII via format_override) or ZUGFeRD COMFORT, US emits a plain PDF. Any other sender jurisdiction is rejected with `unsupported_jurisdiction`. The format is selected automatically from the sender's country (override with `format_override`, or auto-select XRechnung UBL by setting `recipient.leitweg_id`); German output is validated against EN 16931 before bytes are returned. **B2G submission is NOT included yet** — for XRechnung the response carries the legally binding XML, a PDF preview, and a `submission` object explaining how to upload the XML manually (ZRE / OZG-RE / Peppol direct send is on the roadmap). Surface that limitation to the user before they commit to a B2G invoice. After email verification succeeds, returns a durable signed download URL plus the resolved format. Synchronous — blocks until validation passes; use `get_invoice` afterwards to re-mint the download URL on demand. Safe to retry with identical inputs: when no `idempotency_key` is supplied the client derives one, so repeats return the original invoice. The exception is `invoice_source_review_required`: the invoice number is already used for that recipient with different facts, or the recipient matches more than one business partner or its name or tax ID conflicts with the business partner on record, and nothing was recorded — do not retry unchanged; when `details.reason` is `unresolved_parties` ask the user to check the recipient's name and tax ID, otherwise ask for a different invoice number. `invoice_admission_busy` means another invoice is being recorded; retry the same call shortly. `invoice_storage_unavailable` means storing the invoice timed out and nothing was recorded; retry the same call shortly. If this returns `verification_required`, ask the user to paste the 6-digit code from the verification email, call `verify_email_code`, then retry th

輸入參數noteslocalesender必填currency必填due_daterecipient必填issue_dateline_items必填jurisdictiondelivery_datepayment_meanspayment_terms另有 5 個

get_invoice

Fetch Invoice

Fetch a previously generated invoice by its `invoice_id` and return its current metadata plus a freshly signed download URL. Read-only and tenant-scoped — cross-tenant lookups return 404. Use this after `create_invoice` to re-download bytes from a different device, or to obtain a new signed URL after the original expires.

輸入參數invoice_id必填

list_supported_jurisdictions

List Supported Jurisdictions

List jurisdictions Scribo can emit invoices for, with each jurisdiction's available formats and the default format applied when no override is given. Phase 1 returns Germany (DE — XRechnung / ZUGFeRD) and the United States (US — plain PDF) only. Read-only and side-effect-free; safe to call before `create_invoice` to confirm a country is supported. Returns an array of `{ jurisdiction, formats[], default_format }`.

無需輸入參數。

verify_email_code

Use this after `create_invoice` returns `verification_required`. Arguments: `{ challenge_id, code }`. On success returns a `verification_token`. Retry `create_invoice` with the same arguments plus that `verification_token` passed in its `verification_token` field. The token is reusable for ~30 min, so thread the same one into every subsequent `create_invoice` for the same sender email until it expires. Only ever call this with a code the user gave you: attempts are capped, a handful of failures revokes the challenge and forces the user to request a new email, and a `rate_limited` error means stop and tell them to wait, not retry.

輸入參數code必填challenge_id必填

版本歷史

1
  1. v1.0.0最新Sep 16, 2026

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