# D Fetcher (remote · dfetcher.com)

Vitamin D synthesis calculator: sun position, UV, IU/min, time to dose, sunburn risk, daily window.

- Trust score: 64/100 (medium)
- Change this week: +1
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `dfetcher.com`: 64/100 (this document), [markdown](https://verifymcp.io/servers/com-dfetcher-vitamin-d/dfetcher.md), [page](https://verifymcp.io/servers/com-dfetcher-vitamin-d/dfetcher)

## Channel facts

- Endpoint: `https://dfetcher.com/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 2026-08-03.

- **Endpoint Security**: 57/100
  - 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 3 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.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - 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**: 72/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 488 tokens (~162/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - 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**: 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.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-dfetcher-vitamin-d https://dfetcher.com/mcp
```

### Codex

```toml
[mcp_servers.com-dfetcher-vitamin-d]
url = "https://dfetcher.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-dfetcher-vitamin-d": {
      "type": "remote",
      "url": "https://dfetcher.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-dfetcher-vitamin-d --url https://dfetcher.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-dfetcher-vitamin-d:
    url: "https://dfetcher.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "com-dfetcher-vitamin-d": {
      "type": "http",
      "url": "https://dfetcher.com/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.

### 2026-08-02 (score 64, +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.

### 2026-07-31 (score 63, 0)

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

### 2026-07-30 (score 63, −1)

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

### 2026-07-28 (score 64, +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 63, +1)

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

### 2026-07-26 (score 62)

First indexed and scored.

## MCP tools (3)

### `calculate` (~265 tokens)

Vitamin D synthesis calculator

Calculate vitamin D synthesis at a given location and time. Returns sun position, UV index, IU/min, minutes to reach the target dose, MED (sunburn threshold), the peak window, and optional 15-min day / monthly year curves. UV index uses a live satellite-driven forecast where available, with a clear-sky fallback.

Input parameters:

- `age` (integer): Age in years (used for the age factor).
- `area` (number): Exposed body fraction. 0.10 face+hands, 0.25 arms+face, 0.40 t-shirt+shorts, 0.85 near-full body.
- `date` (string): ISO 8601 timestamp or epoch ms. Defaults to now.
- `day` (boolean): Include 15-min samples through the local day.
- `lat` (number, required): Latitude in degrees.
- `lon` (number, required): Longitude in degrees.
- `scalp` (string): Scalp coverage. "bald" adds ~3.5% BSA.
- `skin` (integer): Fitzpatrick skin type 1–6. Use describe_skin_types if unknown.
- `target` (integer): Daily vitamin D target in IU.
- `year` (boolean): Include monthly solar-noon samples with cloud climatology.

### `geocode` (~116 tokens)

Resolve a place to lat/lon

Turn a place name, postal code, or "code, CC" string into { lat, lon, label }. Auto-detects US/CA/GB/NL/JP/BR postal patterns; ambiguous digit-only codes default to US unless the caller appends a country code (e.g. "10115, DE"). Falls back to Open-Meteo place-name search for everything else.

Input parameters:

- `query` (string, required): City name, postal code, or "CODE, CC" (e.g. "75001, FR").

### `describe_skin_types` (~46 tokens)

Fitzpatrick skin type reference

Returns the six Fitzpatrick skin types with sun-reactivity behavior and descriptive ancestry hints. Call this when the user's skin type is unknown so you can pick the closest match before calling calculate.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-dfetcher-vitamin-d/dfetcher#diagnostics

## Score history

- 2026-08-03: 64
- 2026-08-02: 64
- 2026-08-01: 63
- 2026-07-31: 63
- 2026-07-30: 63
- 2026-07-29: 64
- 2026-07-28: 64
- 2026-07-27: 63
- 2026-07-26: 62

## Links

- Remote endpoint: https://dfetcher.com/mcp
- Repository: https://github.com/rgrieselhuber/dfetcher
- Website: https://dfetcher.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-dfetcher-vitamin-d/dfetcher/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-dfetcher-vitamin-d/dfetcher/changelog.json
- HTML version of this page: https://verifymcp.io/servers/com-dfetcher-vitamin-d/dfetcher