# Wärmepumpen-Vorcheck (remote · waermepumpen-vorcheck.de)

Heat-pump readiness check for German single-family houses: traffic light, reasons, next step

- Trust score: 75/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `waermepumpen-vorcheck.de`: 75/100 (this document), [markdown](https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck.md), [page](https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck)

## Channel facts

- Endpoint: `https://waermepumpen-vorcheck.de/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - 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**: 59/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 742 tokens (~742/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 30/100
  - Stability observed for 9 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Wärmepumpen-Vorcheck MCP server?

Wärmepumpen-Vorcheck is a hosted endpoint at https://waermepumpen-vorcheck.de/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.

### Claude

```bash
claude mcp add --transport http de-waermepumpen-vorcheck-vorcheck 'https://waermepumpen-vorcheck.de/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "de-waermepumpen-vorcheck-vorcheck": {
      "url": "https://waermepumpen-vorcheck.de/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "de-waermepumpen-vorcheck-vorcheck": {
      "type": "http",
      "url": "https://waermepumpen-vorcheck.de/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.de-waermepumpen-vorcheck-vorcheck]
url = "https://waermepumpen-vorcheck.de/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "de-waermepumpen-vorcheck-vorcheck": {
      "type": "remote",
      "url": "https://waermepumpen-vorcheck.de/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add de-waermepumpen-vorcheck-vorcheck --url 'https://waermepumpen-vorcheck.de/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  de-waermepumpen-vorcheck-vorcheck:
    url: "https://waermepumpen-vorcheck.de/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "de-waermepumpen-vorcheck-vorcheck": {
      "Transport": "http",
      "Url": "https://waermepumpen-vorcheck.de/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add de-waermepumpen-vorcheck-vorcheck -t streamable-http -u 'https://waermepumpen-vorcheck.de/mcp'
```

### Other

```json
{
  "mcpServers": {
    "de-waermepumpen-vorcheck-vorcheck": {
      "type": "http",
      "url": "https://waermepumpen-vorcheck.de/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.

### 2026-11-05 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 73, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “waermepumpen_vorcheck” rewrote its description, which is the text the model reads

### 2026-11-01 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 72, +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.

### 2026-10-28 (score 71, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-27 (score 70)

First indexed and scored.

## MCP tools (1)

### `waermepumpen_vorcheck` (~575 tokens)

Wärmepumpen-Vorcheck: Ampel für ein Haus

Verwenden, wenn jemand eine erste Einschätzung der Voraussetzungen für eine Luft-Wasser-Wärmepumpe in einem selbst bewohnten Einfamilien-, Doppel- oder Reihenhaus in Deutschland möchte. Liefert eine Ampel (gruen/gelb/rot/unbekannt) mit Begründung, die Einordnung der Heizlast pro m² (niedrig/mittel/hoch), den wichtigsten nächsten Schritt und einen vorbefüllten Link zum vollständigen Check. Keine normgerechte Heizlastberechnung, Gerätegröße, Förderzusage, Buchung oder Antragstellung. Use for an initial heat-pump readiness assessment of an owner-occupied single-family house in Germany; not for system design, grant applications, or booking.

Input parameters:

- `abschlag_gas_eur_monat` (number): Nur wenn kein Jahresverbrauch bekannt ist: monatlicher Abschlag für Gas in €. Wird als grobe Schätzung umgerechnet; sie kann die Einschätzung nie verschlechtern.
- `baujahr` (string): Baujahresklasse des Gebäudes (nicht der Heizung)
- `brennstoff` (string): Brennstoff und Einheit des Verbrauchs (Gas in kWh oder m³, Heizöl in Litern, Pellets in kg, Flüssiggas in Litern, Fernwärme in kWh, Heizstrom in kWh)
- `flaeche` (number): Beheizte Wohnfläche in m²
- `haustyp` (string): Freistehend, Doppelhaushälfte (dhh), Reihenend- oder Reihenmittelhaus
- `heizflaechen` (string): Überwiegend Fußbodenheizung, Heizkörper, gemischt – oder keine (keine wassergeführte Heizung, z. B. Nachtspeicher/Elektro)
- `heizsystem` (string): Besonderheit der Wärmeverteilung: Gas-Etagenheizung (etage) oder Einrohrheizung (einrohr); sonst zentral
- `saniert` (array): Bereits gedämmt/erneuert: Dach bzw. oberste Geschossdecke, Fenster, Außenwände, Kellerdecke
- `test55` (string): Wurden an einem kalten Tag mit höchstens 55 °C Vorlauf alle Räume warm? teilweise = ein oder zwei Räume blieben kühl, nein = mehrere. Bei Fußbodenheizung nicht nötig.
- `verbrauch` (number): Jahresverbrauch in der gewählten Einheit, aus der Jahresabrechnung
- `verbrauch_ganzes_jahr` (boolean): false, wenn der Verbrauch nicht für ein ganzes Jahr gilt
- `warmwasser` (string): Wird das Warmwasser mit derselben Heizung erwärmt?

Output parameters:

- `ampel` (string)
- `begruendung` (array)
- `heizlast_pro_m2` (string)
- `hinweis` (string)
- `link` (string)
- `naechster_schritt` (string|null)
- `titel` (string)
- `zusammenfassung` (string)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck#diagnostics

## Score history

- 2026-11-05: 75
- 2026-11-04: 74
- 2026-11-03: 74
- 2026-11-02: 73
- 2026-11-01: 73
- 2026-10-31: 72
- 2026-10-30: 72
- 2026-10-29: 71
- 2026-10-28: 71
- 2026-10-27: 70

## Common questions

### What is the Wärmepumpen-Vorcheck MCP server?

Wärmepumpen-Vorcheck is an MCP server listed in the public MCP registry as de.waermepumpen-vorcheck/vorcheck. Heat-pump readiness check for German single-family houses: traffic light, reasons, next step. This page covers its hosted endpoint (https://waermepumpen-vorcheck.de/mcp).

### Is the Wärmepumpen-Vorcheck MCP server safe to use?

Wärmepumpen-Vorcheck scores 75 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 Wärmepumpen-Vorcheck MCP server expose?

Wärmepumpen-Vorcheck exposes 1 tool: waermepumpen_vorcheck. Their descriptions and schemas cost roughly 575 tokens of context every time the server is loaded.

### Does the Wärmepumpen-Vorcheck MCP server require authentication?

No. We connected to Wärmepumpen-Vorcheck without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Wärmepumpen-Vorcheck MCP server still maintained?

Wärmepumpen-Vorcheck is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the Wärmepumpen-Vorcheck MCP server?

VerifyMCP ran 13 checks on Wärmepumpen-Vorcheck, covering TLS certificate, Authorization, HTTPS, HSTS header and 9 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://waermepumpen-vorcheck.de/mcp
- Website: https://waermepumpen-vorcheck.de/mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck.xml
- Changelog JSON feed: https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck.json
- HTML version of this page: https://verifymcp.io/servers/de-waermepumpen-vorcheck-vorcheck/waermepumpen-vorcheck