# dev.crelvo/german-tax-data (remote · data.crelvo.dev)

German municipal tax data (Hundesteuer, Zweitwohnungsteuer, Pfaendung), cited to the source

- Trust score: 71/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `data.crelvo.dev`: 71/100 (this document), [markdown](https://verifymcp.io/servers/dev-crelvo-german-tax-data/data.md), [page](https://verifymcp.io/servers/dev-crelvo-german-tax-data/data)

## Channel facts

- Endpoint: `https://data.crelvo.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 9 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 88/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 911 tokens (~75/item across 12 items; 9 tools + 3 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 92/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 75% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http dev-crelvo-german-tax-data https://data.crelvo.dev/mcp
```

### Codex

```toml
[mcp_servers.dev-crelvo-german-tax-data]
url = "https://data.crelvo.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-crelvo-german-tax-data": {
      "type": "remote",
      "url": "https://data.crelvo.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-crelvo-german-tax-data --url https://data.crelvo.dev/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-crelvo-german-tax-data:
    url: "https://data.crelvo.dev/mcp"
```

### Other

```json
{
  "mcpServers": {
    "dev-crelvo-german-tax-data": {
      "type": "http",
      "url": "https://data.crelvo.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 70, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 69, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 67, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 67)

First indexed and scored.

## MCP tools (9)

### `list_datasets` (~54 tokens)

List the available hand-verified German municipal tax/fee datasets (Hundesteuer, Zweitwohnungsteuer, Pfändung), their coverage, source sites and refresh cadence. Call this first to see what you can query.

### `hundesteuer_lookup` (~139 tokens)

Look up the German dog tax (Hundesteuer) for a city: annual rate for one or more dogs, listed-dog (Listenhund) surcharge, the city's pricing model, its rank among the largest cities, plus the official source and Stand. Rates verified against each municipal Satzung.

Input parameters:

- `city` (string, required): City name or slug, e.g. "Köln", "muenchen", "Frankfurt"
- `dogs` (integer): Number of dogs (default 1)
- `listed` (boolean): Treat as a listed/dangerous-breed dog (Listenhund) if the city has a higher rate

### `hundesteuer_ranking` (~59 tokens)

Ranking of German cities by Hundesteuer (first dog, per year): most expensive or cheapest, plus the national average across the covered cities.

Input parameters:

- `limit` (integer): How many cities to return
- `order` (string)

### `hundesteuer_by_state` (~78 tokens)

Average German dog tax (Hundesteuer, first dog per year) per Bundesland (federal state), aggregated over the covered largest cities — the data behind the Deutschlandkarte. Answers 'which German state has the highest/lowest dog tax'. Note: a mean over cities, not an official state rate (the tax is municipal).

### `zweitwohnungsteuer_lookup` (~139 tokens)

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.

Input parameters:

- `city` (string, required): City name or slug, e.g. "Stuttgart", "muenchen", "Konstanz"
- `monthly_rent`: Monthly cold rent (Kaltmiete) in EUR, to compute the annual tax (only for computable cities)

### `zweitwohnungsteuer_ranking` (~66 tokens)

Ranking of German cities by Zweitwohnungsteuer rate: highest or lowest, plus the average, count with a computable rate, and count of cities with no second-home tax.

Input parameters:

- `limit` (integer): How many cities to return
- `order` (string)

### `zweitwohnungsteuer_changes` (~63 tokens)

List German cities that changed (raised or newly introduced) their Zweitwohnungsteuer in a given year — the fresh-news angle. Defaults to 2026 (Stuttgart, Chemnitz, Heidelberg doubled to 20%, etc.).

Input parameters:

- `year` (integer)

### `zweitwohnungsteuer_by_state` (~84 tokens)

Average German second-home tax (Zweitwohnungsteuer) rate in percent per Bundesland (federal state), aggregated over the levying cities with a computable rate — the data behind the Deutschlandkarte. Answers 'which German state has the highest/lowest second-home tax'. Note: a mean over cities, not an official state rate (the tax is municipal).

### `pfaendung_calc` (~107 tokens)

Compute the attachable portion of monthly net income under German §850c ZPO (Pfändung / wage garnishment), using the current official Pfändungsfreigrenzenbekanntmachung. Returns attachable amount, remaining amount, exempt base and the P-Konto base. Informational, not legal advice.

Input parameters:

- `dependents` (integer): Number of maintenance-dependent persons (0-5)
- `net_income_eur` (number, required): Monthly NET income in EUR

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-crelvo-german-tax-data/data#diagnostics

## Score history

- 2026-08-03: 71
- 2026-08-02: 70
- 2026-08-01: 70
- 2026-07-31: 70
- 2026-07-30: 69
- 2026-07-29: 69
- 2026-07-28: 68
- 2026-07-27: 67
- 2026-07-26: 67

## Links

- Remote endpoint: https://data.crelvo.dev/mcp
- Website: https://kommunalwerte.de/
- Changelog RSS feed: https://verifymcp.io/servers/dev-crelvo-german-tax-data/data/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-crelvo-german-tax-data/data/changelog.json
- HTML version of this page: https://verifymcp.io/servers/dev-crelvo-german-tax-data/data