dev.crelvo/german-tax-data
REMOTE · DATA.CRELVO.DEV · SCANNED SEP 21
German municipal tax data (Hundesteuer, Zweitwohnungsteuer, Pfaendung), cited to the source
Available components
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. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 10 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability84
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 1076 tokens (~82/item across 13 items; 10 tools + 3 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage90
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 69% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the dev.crelvo/german-tax-data MCP server?
dev.crelvo/german-tax-data is a hosted endpoint at https://data.crelvo.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · data.crelvo.dev
claude mcp add --transport http dev-crelvo-german-tax-data 'https://data.crelvo.dev/mcp'
{
"mcpServers": {
"dev-crelvo-german-tax-data": {
"url": "https://data.crelvo.dev/mcp"
}
}
} {
"servers": {
"dev-crelvo-german-tax-data": {
"type": "http",
"url": "https://data.crelvo.dev/mcp"
}
}
} [mcp_servers.dev-crelvo-german-tax-data] url = "https://data.crelvo.dev/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"dev-crelvo-german-tax-data": {
"type": "remote",
"url": "https://data.crelvo.dev/mcp",
"enabled": true
}
}
} openclaw mcp add dev-crelvo-german-tax-data --url 'https://data.crelvo.dev/mcp' --transport streamable-http
mcp_servers:
dev-crelvo-german-tax-data:
url: "https://data.crelvo.dev/mcp" {
"McpServers": {
"dev-crelvo-german-tax-data": {
"Transport": "http",
"Url": "https://data.crelvo.dev/mcp"
}
}
} assistant mcp add dev-crelvo-german-tax-data -t streamable-http -u 'https://data.crelvo.dev/mcp'
{
"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.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 31 Aug 26 0
- Tool “zweitwohnungsteuer_changes” rewrote its description, which is the text the model reads security
- Schema quality: 911 → 1076 ▼ functional
- Tool coverage: 75% → 69% ▼ functional
- Schema quality: excellent → good functional
- Server version: 1.1.0 → 1.2.0 functional
- New tool “hundesteuer_changes” functional
- 26 Aug 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 24 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 5 Aug 26 0
- Authorization: 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. security
- Schema quality: 40 → 75 ▼ functional
- Schema quality: unverified → fail ▼ functional
- Tool coverage: unverified → 100 ▲ functional
- Schema quality: poor → excellent functional
- Stability: fail → 0.33 functional
- New tool “hundesteuer_by_state” functional
- New tool “hundesteuer_lookup” functional
- New tool “hundesteuer_ranking” functional
- New tool “list_datasets” functional
- New tool “pfaendung_calc” functional
- New tool “zweitwohnungsteuer_by_state” functional
- New tool “zweitwohnungsteuer_changes” functional
- New tool “zweitwohnungsteuer_lookup” functional
- New tool “zweitwohnungsteuer_ranking” functional
- 4 Aug 26 0
- Stability: 0.27 → fail ▼ security
- A breaking change shipped without a version bump: still 1.1.0 ▼ security
- Tool “hundesteuer_by_state” was removed ▼ security
- Tool “hundesteuer_lookup” was removed ▼ security
- Tool “hundesteuer_ranking” was removed ▼ security
- Tool “list_datasets” was removed ▼ security
- Tool “pfaendung_calc” was removed ▼ security
- Tool “zweitwohnungsteuer_by_state” was removed ▼ security
- Tool “zweitwohnungsteuer_changes” was removed ▼ security
- Tool “zweitwohnungsteuer_lookup” was removed ▼ security
- Tool “zweitwohnungsteuer_ranking” was removed ▼ security
- Authorization: Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the tool list to see what that exposes. security
- Schema quality: fail → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- Schema quality: 75 → 40 ▲ functional
- Schema quality: excellent → poor functional
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 21 Sept 2026 · Probed https://data.crelvo.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_256_GCM_SHA384 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=data.crelvo.dev | CN=YE1,O=Let's Encrypt,C=US | 3 Sept 2026 | 2 Dec 2026 | ECDSA 256 | ECDSA-SHA384 | 587dd1ecbab173d57ae075b21e362066852 |
| SANs: data.crelvo.dev | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of data.crelvo.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| crelvo.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://data.crelvo.dev/mcp | Verified | 200 | |
| http (plaintext) | http://data.crelvo.dev/mcp | HTTPS enforced | 301 | https://data.crelvo.dev/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
hundesteuer_by_state ~78
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).
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
hundesteuer_changes ~134
List German cities that changed their Hundesteuer (dog tax) rate in a given year — the fresh-news angle for the annual city comparison. Only 2026 is curated, and it is the default: 14 of the covered cities changed their rate, led by Köln (174 EUR), Lübeck (156 EUR), Lünen (156 EUR). Also returns outlook_2027: 5 cities that have announced or resolved an increase for 2027 but are NOT yet charging it — announced and in force are kept apart deliberately. Every entry checked individually against the municipal statute.
| Name | Type | Req | Description |
|---|---|---|---|
| year | integer | – | – |
No output schema declared.
No examples provided.
hundesteuer_lookup ~139
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.
| Name | Type | Req | Description |
|---|---|---|---|
| city | string | yes | 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 |
No output schema declared.
No examples provided.
hundesteuer_ranking ~59
Ranking of German cities by Hundesteuer (first dog, per year): most expensive or cheapest, plus the national average across the covered cities.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | How many cities to return |
| order | string | – | – |
No output schema declared.
No examples provided.
list_datasets ~54
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
pfaendung_calc ~107
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.
| Name | Type | Req | Description |
|---|---|---|---|
| dependents | integer | – | Number of maintenance-dependent persons (0-5) |
| net_income_eur | number | yes | Monthly NET income in EUR |
No output schema declared.
No examples provided.
zweitwohnungsteuer_by_state ~84
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).
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
zweitwohnungsteuer_changes ~94
List German cities that changed (raised or newly introduced) their Zweitwohnungsteuer in a given year — the fresh-news angle. Only 2026 is curated, and it is the default: 12 cities changed their rate, led by Potsdam (25 %), Borkum (22 %), Stuttgart (20 %). Every entry checked individually against the municipality's own statute.
| Name | Type | Req | Description |
|---|---|---|---|
| year | integer | – | – |
No output schema declared.
No examples provided.
zweitwohnungsteuer_lookup ~139
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.
| Name | Type | Req | Description |
|---|---|---|---|
| city | string | yes | 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) |
No output schema declared.
No examples provided.
zweitwohnungsteuer_ranking ~66
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.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | How many cities to return |
| order | string | – | – |
No output schema declared.
No examples provided.
What is the dev.crelvo/german-tax-data MCP server?
dev.crelvo/german-tax-data is an MCP server listed in the public MCP registry as dev.crelvo/german-tax-data. German municipal tax data (Hundesteuer, Zweitwohnungsteuer, Pfaendung), cited to the source. This page covers its hosted endpoint (https://data.crelvo.dev/mcp).
Is the dev.crelvo/german-tax-data MCP server safe to use?
dev.crelvo/german-tax-data scores 82 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the dev.crelvo/german-tax-data MCP server expose?
dev.crelvo/german-tax-data exposes 10 tools: list_datasets, hundesteuer_lookup, hundesteuer_ranking, hundesteuer_by_state, hundesteuer_changes, and 5 more. Their descriptions and schemas cost roughly 954 tokens of context every time the server is loaded.
Does the dev.crelvo/german-tax-data MCP server require authentication?
No. We connected to dev.crelvo/german-tax-data without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the dev.crelvo/german-tax-data MCP server still maintained?
dev.crelvo/german-tax-data is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.