Papierkram MCP Server

An MCP (Model Context Protocol) server for the Papierkram.de accounting API. Enables AI assistants to manage invoices, expenses, contacts, projects, time tracking and more directly in your Papierkram account.

Features

• 56 tools covering the full Papierkram API v1
• Install via npm: run directly with npx papierkram-mcp-server — no clone needed
• Two transports: stdio (for Claude Desktop, Cursor, Claude Code) and HTTP/SSE (for n8n, custom integrations)
• Docker ready for easy self-hosted deployment
• TypeScript with Zod schema validation on all parameters

Tools Overview

| Area | Operations | Count | |------|-----------|:-----:| | Contacts | Companies & contact persons: list, get, create, update, delete | 10 | | Invoices | list, get, create, update, delete, cancel, archive, send, download PDF | 9 | | Estimates | list, get, create, update, delete, send, download PDF | 7 | | Expenses | list, get, create, update, delete | 5 | | Projects | list, get, create, update, delete, archive, unarchive | 7 | | Time Tracking | list, get, create, update, delete | 5 | | Tasks | list, get, create, update, delete | 5 | | Banking | list, get bank connections & transactions (read-only) | 4 | | Account | Account info, payment terms, propositions | 4 |

Quick Start

Prerequisites

• Node.js 20+ (or Docker)
• A Papierkram.de account with API access

Get your API Key

Go to Papierkram > Einstellungen > API and create an API key.

Option A: npm (recommended)

No clone required — run directly with npx:

npx papierkram-mcp-server

Or install it globally:

npm install -g papierkram-mcp-server
papierkram-mcp-server

The server talks stdio by default; set PAPIERKRAM_API_KEY and PAPIERKRAM_SUBDOMAIN in your environment or your MCP client config (see Usage).

Option B: Docker (self-hosted HTTP/SSE)

git clone https://github.com/Wagner-Emden-IT-Services/papierkram-mcp-server.git
cd papierkram-mcp-server
cp .env.example .env
# Edit .env with your API key and subdomain
docker compose up -d

The HTTP/SSE server will be available at http://localhost:3001/sse.

Option C: Node.js from source

git clone https://github.com/Wagner-Emden-IT-Services/papierkram-mcp-server.git
cd papierkram-mcp-server
npm install
cp .env.example .env
# Edit .env with your API key and subdomain
npm run build

Configuration

Create a .env file (or copy from .env.example):

PAPIERKRAM_API_KEY=your-api-key-here
PAPIERKRAM_SUBDOMAIN=your-subdomain
PORT=3001  # optional, only for HTTP/SSE mode

Your subdomain is the part before .papierkram.de in your Papierkram URL.

Usage

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "papierkram": {
      "command": "npx",
      "args": ["-y", "papierkram-mcp-server"],
      "env": {
        "PAPIERKRAM_API_KEY": "your-api-key",
        "PAPIERKRAM_SUBDOMAIN": "your-subdomain"
      }
    }
  }
}

Installed from source instead? Use "command": "node" with "args": ["/absolute/path/to/papierkram-mcp-server/dist/index.js"].

Claude Code (CLI)

Add to your ~/.claude.json:

{
  "mcpServers": {
    "papierkram": {
      "command": "npx",
      "args": ["-y", "papierkram-mcp-server"],
      "env": {
        "PAPIERKRAM_API_KEY": "your-api-key",
        "PAPIERKRAM_SUBDOMAIN": "your-subdomain"
      }
    }
  }
}

Cursor

Add to your Cursor MCP settings with the same configuration as Claude Desktop.

HTTP/SSE (for n8n or custom clients)

# Development
npm run dev:http

# Production
npm run start:http

# Docker
docker compose up -d

Connect your MCP client to http://localhost:3001/sse.

Development

npm run dev        # stdio mode with hot reload
npm run dev:http   # HTTP/SSE mode with hot reload
npm run build      # compile TypeScript to dist/

Project Structure

src/
├── index.ts              # Stdio entry point
├── server/
│   ├── server.ts         # MCP server setup + tool registration
│   └── http-server.ts    # HTTP/SSE entry point
├── core/tools/           # Tool definitions (one file per API area) + shared helpers
├── api/
│   ├── client.ts         # HTTP client with auth, timeout & error handling
│   ├── errors.ts         # API/network errors -> actionable UserError messages
│   └── format.ts         # Tool-output size guard (truncation)
└── config/
    └── index.ts          # Environment configuration

Contributing

Contributions are welcome! Please open an issue or pull request.

License

MIT - Wagner-Emden IT Services