scribo-skill

Scribo Skill

Free, AI-native e-invoicing — from Claude, ChatGPT & Codex.

Contents

• What is Scribo?
• What is the Scribo skill?
  • 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 skill?

The Scribo skill teaches your AI assistant to create invoices for you. Add it once, then just ask — "draft an invoice for 3 days of consulting at €1,200/day" — and your assistant gathers the details and hands back a finished, compliant invoice in the chat, ready to download and send. No new app to learn, no forms to fill in.

It works wherever you already work: Claude (Claude.ai, Claude Code, Claude Desktop), ChatGPT, and the OpenAI Codex CLI. Free, no signup — your email is all you need.

Demo

https://github.com/user-attachments/assets/b6603478-4702-4941-bf01-bf4c04bbb098

Getting started

Quickstart

If you use Claude Code, you're two commands away:

/plugin marketplace add causa-prima-ai/scribo-skill
/plugin install scribo-skill@scribo-skill

Then just ask:

Draft an invoice from Example GmbH to Acme GmbH for 3 days of consulting at €1,200/day, 19% VAT.

The skill triggers automatically, asks for anything it's missing, verifies your sender email once (a 6-digit code arrives by email), and returns a downloadable invoice.

On Claude.ai, Claude Desktop, ChatGPT, or Codex CLI instead? Use the matching install method below.

Setup & prerequisites

Prerequisites. Hosted assistants (Claude.ai, Claude Desktop, ChatGPT) need nothing installed. For local installs (Claude Code, Codex CLI) you'll need bash 4+, curl, and jq on your machine (openssl optional).

Pick the method that matches how you run your assistant:

Method	Works with
Plugin install	Claude Code
.zip upload	Claude.ai, Claude Desktop, ChatGPT
git clone	OpenAI Codex CLI, manual Claude Code

Plugin install — Claude Code

/plugin marketplace add causa-prima-ai/scribo-skill
/plugin install scribo-skill@scribo-skill

The skill activates as /scribo-skill:scribo and triggers automatically when you ask to draft an invoice.

.zip upload — Claude.ai, Claude Desktop, ChatGPT

1. Download scribo-skill.zip from the latest release.
2. Upload it:
   • Claude.ai / Claude Desktop — Settings → Customize → Skills → Upload skill.
   • ChatGPT — New skill → Upload from your computer.

One upload covers new chats on that account.

git clone — Codex CLI, manual Claude Code

Clone once, then copy the inner skills/scribo folder into your assistant's skills directory:

git clone https://github.com/causa-prima-ai/scribo-skill /tmp/scribo-skill
cp -r /tmp/scribo-skill/skills/scribo ~/.codex/skills/scribo     # Codex CLI
# or  .claude/skills/scribo     (Claude Code — this project)
# or  ~/.claude/skills/scribo   (Claude Code — all projects)

SKILL.md must end up at …/scribo/SKILL.md. Restart your assistant afterward.

Verify. Ask your assistant: "list the jurisdictions Scribo supports." You should get back a list of supported countries.

Full install detail (Cowork, team installs, troubleshooting): scribo.causaprima.ai/docs/skill.

Usage

How it works

You don't fill in a form — you describe the invoice and your assistant does the rest. When you ask for an invoice, it: