comdirect-mcp

Read-only Model Context Protocol server and typed Python client for the comdirect REST API.

Let Claude, GitHub Copilot or any other MCP client look at your accounts, transactions, securities depot and postbox documents. The login is confirmed with your photoTAN app, and there is no tool that can move money.

Warnung (in Deutsch weil Comdirect)

Leute es geht hier um euer Geld. Nutzt diese Bibliothek nur, wenn ihr den Code versteht und euch den Risiken bewusst seid.

Ich bin auch nicht perfekt, aber übernehme keine Haftung für Schäden, die durch die Nutzung dieser Software entstehen. Falls Euch was auffällt, gern PRs oder Issues.

Die API und damit das Repo hier nutzen aktuell nur lesende Endpunkte, aber Fehler können immer passieren. Comdirect kann die API ändern, Dependencies können im Zweifel auch Mist bauen (Supply-Chain Attacks) und 2FA hilft zwar, ist aber kein Freifahrtschein.

Bitte:

• Nutzt das nur lokal auf eurem eigenen Rechner.
• Teilt eure Zugangsdaten mit niemandem.
• Packt Secrets in .env und committet die Datei nie.
• Nutzt die Pre-Commit Hooks um Secrets zu scannen. Gute Zeit bissel Devops-Kram zu lernen.
• Spielt Updates nicht blind ein (Lockfile/Pinning hilft) und schaut bei Änderungen kurz drüber.

MCP-Server: Wenn ihr den Server an einen nicht-lokalen AI-Client hängt, gehen deine Daten raus. Je nach Client/Setup können Kontodaten/Transaktionen in Logs/Telemetry landen oder durch Prompt-Injection aus Dokumenten/Verwendungszwecken in komische Richtungen gehen (MCP Horror Stories: The GitHub Prompt Injection Data Heist). Nutzt MCP nur, wenn ihr der Umgebung wirklich vertraut, und gebt nur die Daten frei, die ihr dafür braucht.

Da der gemeine r/finanzen User eh schon seine Kontoauszüge in ChatGPT kopiert, könnt ihr damit machen, was ihr wollt, auf eure eigene Verantwortung!

Idealerweise ohne unnötige personenbezogene Daten. (Hauptsache, ihr lasst 'nen Stern da.)

Privacy: prefer a local model

The server runs on your machine, but every tool result is sent to the language model behind your MCP client. With cloud assistants (Claude, GitHub Copilot, ChatGPT, ...) your balances, transactions and documents leave your computer and are processed under that provider's data policy.

• Most private: use an MCP client with a local model, e.g. LM Studio (supports MCP servers directly) or another client running a model via Ollama or llama.cpp. Then nothing leaves your machine except the requests to comdirect. Pick a model with good tool-calling support.
• With a cloud assistant: check its data retention and training settings, use an account where your data is not used for training, and ask only what you need.

Details: Privacy and security · Use a local model

Features

• MCP specification 2026-07-28 on the official MCP Python SDK v2, with fallback for older clients
• Push TAN login via elicitation: your client asks you to approve the login in the photoTAN app; the TAN never reaches the model
• Credentials in the OS keychain: comdirect-mcp configure stores them once, client configs contain no secrets
• No tool can move money: only read endpoints, truthful tool annotations, structured output with JSON schemas
• Protects your access: stops logging in before comdirect's lock after five unconfirmed TAN challenges, and revokes the session at comdirect on logout and shutdown so it cannot be extended
• Privacy defaults: counterparty IBANs masked, documents size-limited, untrusted-content hint for the model
• Automatic token refresh and explicit session handling
• Typed Python client (py.typed) for scripts and notebooks, independent of MCP
• Listed in the MCP Registry as io.github.mad4ms/comdirect-mcp

Tools

Arguments and results: Tools reference.

Quickstart

New to this? Follow the Getting started tutorial.

1. Prerequisites

• uv (provides uvx)
• comdirect API access: in the online banking under Verwaltung → Entwicklerzugang you get a Client ID and Client Secret (step by step)
• photoTAN Push as your default TAN method

2. Store your credentials in the OS keychain

uvx comdirect-mcp@0.4.0 configure

Prompts for Client ID, Client Secret, Zugangsnummer and PIN and stores them in the macOS Keychain, Windows Credential Manager or Linux Secret Service. Other options (VS Code inputs, environment, .env): Manage credentials.

3. Add the server to your MCP client

Claude Desktop (Settings → Developer → Edit Config) and LM Studio (Program → Install → Edit mcp.json):

{
  "mcpServers": {
    "comdirect": {
      "command": "uvx",
      "args": ["comdirect-mcp@0.4.0"]
    }
  }
}

Claude Code

claude mcp add --transport stdio --scope user comdirect -- uvx comdirect-mcp@0.4.0

VS Code (MCP: Open User Configuration)

{
  "servers": {
    "comdirect": {
      "type": "stdio",
      "command": "uvx",
      "args": ["comdirect-mcp@0.4.0"]
    }
  }
}

Pinning the version (@0.4.0) means updates only happen when you decide. More clients: Configure MCP clients.

4. Ask

Wie haben sich meine Ausgaben im letzten Monat entwickelt, und welche Depotposition läuft am schlechtesten?

The assistant calls login, your phone receives the push TAN, you approve it and confirm the dialog in your client. Then the assistant can use the other tools. Problems: Troubleshoot.

Python library

The same client is available for your own scripts:

from comdirect_mcp import ComdirectClient
from comdirect_mcp.utils import default_push_tan_callback

client = ComdirectClient(
    {"client_id": "...", "client_secret": "...", "username": "...", "password": "..."},
    {"push_tan_cb": default_push_tan_callback},
)
client.login()  # approve the push TAN, then press Enter

for account in client.list_accounts():
    print(account.id, account.balance, account.currency)

See Use the Python library, the Python API reference and the examples.

Documentation

The documentation is organized as tutorial, how-to guides, reference and explanation:

SECURITY.md describes the threat model and how to report vulnerabilities, CHANGELOG.md lists the changes per release.

Contributing

Issues and pull requests are welcome, see CONTRIBUTING.md and the Code of Conduct. AI coding agents find their instructions in AGENTS.md.

Disclaimer

This project is not affiliated with, maintained, or endorsed by comdirect bank AG. Use it at your own risk. There is no warranty and no liability for any financial losses or damages resulting from its use.

The software runs locally and does not send your credentials anywhere except to comdirect. Your MCP client and its model provider receive the data the tools return.

License

MIT