Scribo

io.github.causa-prima-ai由 GitHub 账号 causa-prima-ai 发布v1.0.0更新于 Oct 25, 2026

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

已验证Streamable HTTP可网页运行金融商业与电商

概览

AI 生成的概览

Scribo 是一个托管式 MCP 端点，让助手根据自然语言描述起草、生成并重新下载合规的电子发票。

可以做什么
根据发件方、收件方和明细行信息创建发票并返回下载链接；德国发件方获得 EN 16931 格式（XRechnung 或 ZUGFeRD），美国发件方获得普通 PDF，其他司法辖区会被拒绝。当某个发件邮箱的首张发票需要验证时，用 6 位验证码确认该邮箱的所有权。按发票 ID 获取此前生成的发票，并返回新的签名下载链接。列出支持的司法辖区、可用格式及默认格式。
适用场景
适合让助手把一段工作描述变成成品发票文档，尤其是德国 B2B 或公共部门电子发票格式，或简单的美国 PDF 发票，也适合之后重新取回已生成的发票。
运行要求
在支持 MCP 的客户端中添加远程 Streamable HTTP 端点，无需本地安装。未声明身份验证。需要一个发件邮箱地址，新地址的首张发票需输入发送到该邮箱的 6 位验证码。需要能访问该托管服务的网络。
安装前请注意
发票信息（包括发件方与收件方名称、地址、增值税号和金额）会发送给第三方托管服务。某个发件邮箱的首张发票会触发邮件验证码。生成的发票仅为文档，不构成税务或法律建议。目前仅支持德国和美国。

安装

在 SourceWeft 中

  1. 打开 控制台中的 Scribo，将其添加到工作区。
  2. 为需要使用其工具的对话启用该服务。

Web executable，通过 Streamable HTTP。 远程服务在工作区中配置后即可从网页运行时运行。

交给智能体安装

把这段提示词粘贴到 Claude Code、Codex、Cursor 等智能体，或 SourceWeft 对话中。智能体会读取该服务器的安装指南，先向你展示发布者、端点和登录方式，经你同意后再把它添加到你的客户端。密钥不会写进任何命令。

阅读 https://sourceweft.com/mcp/io.github.causa-prima-ai%2Fscribo/install.md，并按其中说明把这个 MCP 服务器接入我的客户端。修改任何配置之前，先告诉我它的发布者、端点和登录方式，等我确认。不要把 API 密钥写进命令或我会提交的文件；问我密钥应从哪里获取。

查看智能体所依据的安装指南

其他 MCP 客户端

把它添加到你客户端的 mcpServers 配置中。

{
  "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.

来源：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

输入参数noteslocalesender必填currency必填due_daterecipient必填issue_dateline_items必填jurisdictiondelivery_datepayment_meanspayment_terms另有 5 个

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.

输入参数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 }`.

无需输入参数。

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.

输入参数code必填challenge_id必填

版本历史

1
  1. v1.0.0最新Sep 16, 2026

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