Crelvo MCP server

Which MCP servers are Crelvo's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-26

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Whose server it is

Registry namedev.crelvo/german-tax-dataverified in the MCP registry

The registry name sits under crelvo.dev. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-26

Stateanswerschecked 2026-10-26
Tools10
Server calls itselfcrelvo-german-tax-data
Server version1.2.0
Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 478 ms.

Should an agent connect itSkip it

Its tools do none of the product's use cases we checked: build full-stack web apps and internal dashboards; produce promo videos and programmatic video pipelines; add LLM chatbots to business workflows.
Checked on 2 of the 7 days it takes to judge reliability.

Once connected

Parameters are untyped or undescribed in 4 of 10 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-26

INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
What an agent can do with it0 of 3 use cases
Answeredmeasuring2 of the 7 daily checks it takes to print a share
Median first answer538 ms
Space in an agent's context≈ 1,457 tokensthe definitions of all its tools (10), which an agent carries on every turn
Tool definitionsB · 77 of 100
Typed results0 of 10 toolsdeclared outputSchema: results come typed, read once

Parameters without a description: in 4 of 10
Not saying whether it only reads or can destroy: 10 of 10

What an agent can do with it

cannot · build full-stack web apps and internal dashboards
cannot · produce promo videos and programmatic video pipelines
cannot · add LLM chatbots to business workflows

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers10 tools · read 2026-10-26

list_datasets
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
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…
hundesteuer_ranking
Ranking of German cities by Hundesteuer (first dog, per year): most expensive or cheapest, plus the national average across the covered cities.
hundesteuer_by_state
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…
hundesteuer_changes
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…
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…
zweitwohnungsteuer_ranking
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.
zweitwohnungsteuer_changes
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 %)…
zweitwohnungsteuer_by_state
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…
pfaendung_calc
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…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Add it

Claude Code, in a terminal

claude mcp add --transport http crelvo https://data.crelvo.dev/mcp

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://data.crelvo.dev/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.