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 | so...
This record as markdown: /tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-lookup.md
What zweitwohnungsteuer_lookup does on German Tax Data
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.
| Parameter | Type | Required | Description |
|---|---|---|---|
city | string | Yes | City name or slug, e.g. "Stuttgart", "muenchen", "Konstanz" |
monthly_rent | object | — | Monthly cold rent (Kaltmiete) in EUR, to compute the annual tax (only for computable cities) |
Parameters from the server's own tool schema.
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 definition Tool description explicitly states 'Look up' and 'Returns' - it retrieves and queries existing tax data for cities without modification.
Attacks that exploit this kind of access
The rule that runs zweitwohnungsteuer_lookup safely
PolicyLayer is an MCP gateway: it sits between your AI agents and German Tax Data, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For zweitwohnungsteuer_lookup, this is the rule to start with:
zweitwohnungsteuer_lookup is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect German Tax Data, apply this rule, and every zweitwohnungsteuer_lookup call is checked against it from then on.
Questions about 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. It is categorised as a Read tool in the German Tax Data MCP Server, which means it retrieves data without modifying state.
zweitwohnungsteuer_lookup accepts 2 parameters: city, monthly_rent. Required: city. The full parameter table on this page comes from the server's own tool schema.
Register the German Tax Data MCP server in PolicyLayer and add a rule for zweitwohnungsteuer_lookup: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches German Tax Data. Nothing to install.
zweitwohnungsteuer_lookup is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the zweitwohnungsteuer_lookup rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for zweitwohnungsteuer_lookup. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
zweitwohnungsteuer_lookup is provided by the German Tax Data MCP server (https://data.crelvo.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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