# zweitwohnungsteuer_lookup

Look up the German second-home tax (Zweitwohnungsteuer) for a city: whether the city levies it, the rate and its basis (net cold rent etc.), the rank among cities, official source and Stand. Optionally pass a monthly cold rent to get the annual tax. Returns state = keine_steuer | berechenbar | sondermodell.

Agent View of the PolicyLayer registry record for `zweitwohnungsteuer_lookup`. HTML page: https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-lookup

## Facts

- Tool: `zweitwohnungsteuer_lookup`
- Server: German Tax Data (`https://data.crelvo.dev/mcp`) — https://policylayer.com/tools/dev-crelvo-german-tax-data.md
- Homepage: https://github.com/https://data.crelvo.dev/mcp
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 2 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `city` | string | yes | City name or slug, e.g. "Stuttgart", "muenchen", "Konstanz" |
| `monthly_rent` | object | no | Monthly cold rent (Kaltmiete) in EUR, to compute the annual tax (only for computable cities) |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "zweitwohnungsteuer_lookup",
    "arguments": {
      "city": "<city>"
    }
  }
}
```

## Why zweitwohnungsteuer_lookup is rated Low

This is a pure data retrieval tool that queries German municipal tax information. It reads tax rates, rankings, and source citations without creating, modifying, deleting, or executing external operations. The optional calculation of annual tax based on input rent is a read-only computation. No data is changed, no operations are triggered, and no financial transactions occur—only information is returned to the user.

From the tool's own definition: "Tool description explicitly states 'Look up' and 'Returns' - it retrieves and queries existing tax data for cities without modification."

## Use case

AI agents call zweitwohnungsteuer_lookup to retrieve information from German Tax Data without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches German Tax Data:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "zweitwohnungsteuer_lookup": {}
  }
}
```

## Other tools on German Tax Data (8)

- `hundesteuer_by_state` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/hundesteuer-by-state.md
- `hundesteuer_lookup` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/hundesteuer-lookup.md
- `hundesteuer_ranking` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/hundesteuer-ranking.md
- `list_datasets` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/list-datasets.md
- `pfaendung_calc` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/pfaendung-calc.md
- `zweitwohnungsteuer_by_state` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-by-state.md
- `zweitwohnungsteuer_changes` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-changes.md
- `zweitwohnungsteuer_ranking` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-ranking.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dev-crelvo-german-tax-data · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-crelvo-german-tax-data