Elster MCP Server

by lukasschwarzio.github.lukasschwarz/elster-mcp-serverv0.1.0

Drive the German tax portal ELSTER via Puppeteer: submit UStVA, prepare EUER/ESt, sync inbox.

19Node.jsstdioofficial registry

context tax

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security

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freshness

Maintained3mo ago

Install Elster MCP server

claude mcp add elster -e ELSTER_PASSWORD='<elster-password>' -- npx -y elster-mcp-server

{
  "mcpServers": {
    "elster": {
      "command": "npx",
      "args": [
        "-y",
        "elster-mcp-server"
      ],
      "env": {
        "ELSTER_PASSWORD": "<elster-password>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "elster": {
      "command": "npx",
      "args": [
        "-y",
        "elster-mcp-server"
      ],
      "env": {
        "ELSTER_PASSWORD": "<elster-password>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "elster": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "elster-mcp-server"
      ],
      "env": {
        "ELSTER_PASSWORD": "<elster-password>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "elster": {
      "command": "npx",
      "args": [
        "-y",
        "elster-mcp-server"
      ],
      "env": {
        "ELSTER_PASSWORD": "<elster-password>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
ELSTER_CONFIG_PATH	—	—	Path to a config.json that holds all settings below. Recommended.
ELSTER_PFX_PATH	—	—	Absolute path to your ELSTER certificate (.pfx).
ELSTER_PASSWORD	—	yes	Password for the .pfx certificate.
ELSTER_TAX_NUMBER	—	—	Your Steuernummer in the format issued by your Finanzamt.
ELSTER_STATE_CODE	—	—	Two-digit ELSTER federal-state code of your Finanzamt.
ELSTER_NAME	—	—	Last name / company name.
ELSTER_FIRST_NAME	—	—	First name.
ELSTER_STREET	—	—	Street.
ELSTER_HOUSE_NUMBER	—	—	House number.
ELSTER_ZIP	—	—	ZIP code.
ELSTER_CITY	—	—	City.
ELSTER_COUNTRY	—	—	ISO country code, default DE.
ELSTER_HEADLESS	—	—	Run Chromium headless (true/false). Default true.
ELSTER_EST_SKIP_EUR	—	—	If 1, skip the EUER pre-hook in ESt sessions.

Freshness

Maintained — last maintenance signal 3mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-07-13 · 3mo ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-06-27 · 4mo ago · official registry · v0.1.0

FAQ

›How do I install the Elster MCP server in Claude Code?

Run: claude mcp add elster -e ELSTER_PASSWORD='<elster-password>' -- npx -y elster-mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Elster require an API key?

Yes. It expects ELSTER_PASSWORD, of which 1 is a secret.

›Can I use Elster as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Elster in the official MCP registry?

Yes, as io.github.lukasschwarz/elster-mcp-server.